fallow_api/

dead_code_codeclimate.rs

//! Shared dead-code CodeClimate issue construction.

use std::path::Path;

use fallow_config::{RulesConfig, Severity};
use fallow_output::{
    CodeClimateIssue, CodeClimateIssueInput, CodeClimateSeverity, build_codeclimate_issue,
    codeclimate_fingerprint_hash, normalize_uri,
};
use fallow_types::identity::dead_code_finding_id;
use fallow_types::output_dead_code::{
    EffectiveSeverity, GatedFinding, ReachabilityCaveat, caveat_suffix,
};
use fallow_types::results::AnalysisResults;

fn severity_to_codeclimate(s: Severity) -> CodeClimateSeverity {
    match s {
        Severity::Error => CodeClimateSeverity::Major,
        Severity::Warn => CodeClimateSeverity::Minor,
        Severity::Off => unreachable!(),
    }
}

/// The CodeClimate severity for one finding: its gate severity when the
/// finding carries one, otherwise the configured rule severity (a saved report
/// from an older version has no gate severity).
///
/// A saved finding exists, so its rule was on when it was reported. When the
/// config at render time sets the rule `off`, the severity is `minor`.
fn gate_codeclimate(effective: Option<EffectiveSeverity>, rule: Severity) -> CodeClimateSeverity {
    match effective {
        Some(EffectiveSeverity::Error) => CodeClimateSeverity::Major,
        Some(EffectiveSeverity::Warn) => CodeClimateSeverity::Minor,
        None => match rule {
            Severity::Off => CodeClimateSeverity::Minor,
            Severity::Error | Severity::Warn => severity_to_codeclimate(rule),
        },
    }
}

fn finding_codeclimate(finding: &impl GatedFinding, rule: Severity) -> CodeClimateSeverity {
    gate_codeclimate(finding.effective_severity(), rule)
}

fn cc_path(path: &Path, root: &Path) -> String {
    normalize_uri(
        &path
            .strip_prefix(root)
            .unwrap_or(path)
            .display()
            .to_string(),
    )
}

/// The caveat parenthetical a CodeClimate `description` ends with, or an empty
/// string when the verdict rests on a fully analyzed run.
///
/// `description` is the one field GitLab renders inline on the MR diff, and it
/// is also what `CiIssue` carries into the PR-comment and review-comment
/// bodies. Those bodies offer a mutation, so the sentence that offers it has to
/// say when the evidence behind it is incomplete. The suffix is the same
/// parenthetical the human report and the SARIF message already use, so one
/// finding reads identically across every surface.
///
/// Deliberately NOT part of the fingerprint: `codeclimate_fingerprint_hash` is
/// fed rule id plus location by every call site in this file, never the
/// description, so a finding that gains or loses a caveat keeps its identity
/// and no previously resolved review thread reopens.
fn cc_caveat_suffix(caveats: &[ReachabilityCaveat]) -> String {
    caveat_suffix(caveats).unwrap_or_default()
}

/// Build one dead-code issue with its stable fingerprint.
///
/// `input.fingerprint` is the legacy fingerprint: the value that Fallow gave
/// this issue before findings had a `finding_id`. For most kinds it holds the
/// line, so a line shift above the finding changed it.
///
/// When the finding has a `finding_id`, the fingerprint is the FNV-1a 64 hash
/// of that id plus `discriminator`, as 16 lowercase hex digits. The id holds
/// no line and no column, so a line shift keeps the fingerprint. The hash
/// covers the full id, not only the hex part of the id, so the `~k` tiebreak
/// suffix keeps two findings with the same base id apart. The 16-hex form is
/// the form that GitLab Code Quality and the review marker regex accept.
/// `discriminator` separates the issues of one finding that emits one issue
/// per location (duplicate exports, unlisted-dependency import sites). See
/// [`location_discriminators`].
///
/// A finding without an id (a saved report from an older version) keeps the
/// legacy fingerprint, so its review threads stay matched.
fn dead_code_issue(
    finding_id: Option<&str>,
    discriminator: &[&str],
    input: CodeClimateIssueInput<'_>,
) -> CodeClimateIssue {
    let mut issue = build_codeclimate_issue(input);
    if let Some(id) = finding_id {
        let mut parts = Vec::with_capacity(discriminator.len() + 1);
        parts.push(id);
        parts.extend_from_slice(discriminator);
        let stable = codeclimate_fingerprint_hash(&parts);
        if stable != issue.fingerprint {
            issue.legacy_fingerprint = Some(std::mem::replace(&mut issue.fingerprint, stable));
        }
    }
    issue
}

/// The discriminator of each location of one finding, in input order.
///
/// A location is named by what it is, not by where it is. The only content a
/// location carries next to the finding id is its path: the engine reports
/// one unlisted-dependency import site per file, and every location of a
/// duplicate export has the same export name, which the id already holds. So
/// the discriminator is the path. Only locations with the same path (the same
/// content) also get a position: the first by line keeps the bare path, the
/// next one gets `~1`, and so on. A location added to or removed from another
/// file, or after this one in the same file, never changes it.
fn location_discriminators(locations: &[(String, u32, u32)]) -> Vec<Vec<String>> {
    locations
        .iter()
        .enumerate()
        .map(|(index, (path, line, col))| {
            let earlier = locations
                .iter()
                .enumerate()
                .filter(|(other, (other_path, other_line, other_col))| {
                    other_path == path && (other_line, other_col, *other) < (line, col, index)
                })
                .count();
            if earlier == 0 {
                vec![path.clone()]
            } else {
                vec![path.clone(), format!("~{earlier}")]
            }
        })
        .collect()
}

/// Push CodeClimate issues for unused dependencies with a shared structure.
fn push_dep_cc_issues<'a, I>(
    issues: &mut Vec<CodeClimateIssue>,
    deps: I,
    root: &Path,
    rule_id: &str,
    location_label: &str,
    severity: Severity,
) where
    I: IntoIterator<
        Item = (
            &'a fallow_types::results::UnusedDependency,
            &'a [ReachabilityCaveat],
            Option<EffectiveSeverity>,
            Option<&'a str>,
        ),
    >,
{
    for (dep, caveats, effective, finding_id) in deps {
        let level = gate_codeclimate(effective, severity);
        let path = cc_path(&dep.path, root);
        let line = if dep.line > 0 { Some(dep.line) } else { None };
        let fp = codeclimate_fingerprint_hash(&[rule_id, &dep.package_name]);
        let workspace_context = if dep.used_in_workspaces.is_empty() {
            String::new()
        } else {
            let workspaces = dep
                .used_in_workspaces
                .iter()
                .map(|path| cc_path(path, root))
                .collect::<Vec<_>>()
                .join(", ");
            format!("; imported in other workspaces: {workspaces}")
        };
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: rule_id,
                description: &format!(
                    "Package '{}' is in {location_label} but never imported{workspace_context}{}",
                    dep.package_name,
                    cc_caveat_suffix(caveats)
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_file_issues(
    issues: &mut Vec<CodeClimateIssue>,
    files: &[fallow_types::output_dead_code::UnusedFileFinding],
    root: &Path,
    severity: Severity,
) {
    if files.is_empty() {
        return;
    }
    for entry in files {
        let level = finding_codeclimate(entry, severity);
        let path = cc_path(&entry.file.path, root);
        let fp = codeclimate_fingerprint_hash(&["fallow/unused-file", &path]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-file",
                description: &format!(
                    "File is not reachable from any entry point{}",
                    cc_caveat_suffix(&entry.reachability_caveats)
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: None,
                fingerprint: &fp,
            },
        ));
    }
}

/// Push CodeClimate issues for unused exports or unused types.
///
/// `direct_label` / `re_export_label` let the same helper produce the right
/// prose for both `unused-export` (Export / Re-export) and `unused-type`
/// (Type export / Type re-export) rule ids.
struct UnusedExportIssuesInput<'a, I> {
    issues: &'a mut Vec<CodeClimateIssue>,
    exports: I,
    root: &'a Path,
    rule_id: &'a str,
    direct_label: &'a str,
    re_export_label: &'a str,
    severity: Severity,
}

fn push_unused_export_issues<'a, I>(input: UnusedExportIssuesInput<'a, I>)
where
    I: IntoIterator<
        Item = (
            &'a fallow_types::results::UnusedExport,
            &'a [ReachabilityCaveat],
            Option<EffectiveSeverity>,
            Option<&'a str>,
        ),
    >,
{
    for (export, caveats, effective, finding_id) in input.exports {
        let level = gate_codeclimate(effective, input.severity);
        let path = cc_path(&export.path, input.root);
        let kind = if export.is_re_export {
            input.re_export_label
        } else {
            input.direct_label
        };
        let line_str = export.line.to_string();
        let fp =
            codeclimate_fingerprint_hash(&[input.rule_id, &path, &line_str, &export.export_name]);
        input.issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: input.rule_id,
                description: &format!(
                    "{kind} '{}' is never imported by other modules{}",
                    export.export_name,
                    cc_caveat_suffix(caveats)
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(export.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_private_type_leak_issues(
    issues: &mut Vec<CodeClimateIssue>,
    leaks: &[fallow_types::output_dead_code::PrivateTypeLeakFinding],
    root: &Path,
    severity: Severity,
) {
    if leaks.is_empty() {
        return;
    }
    for entry in leaks {
        let level = finding_codeclimate(entry, severity);
        let leak = &entry.leak;
        let path = cc_path(&leak.path, root);
        let line_str = leak.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/private-type-leak",
            &path,
            &line_str,
            &leak.export_name,
            &leak.type_name,
        ]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/private-type-leak",
                description: &format!(
                    "Export '{}' references private type '{}'",
                    leak.export_name, leak.type_name
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(leak.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_deprecated_export_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::DeprecatedExportInUseFinding],
    root: &Path,
    severity: Severity,
) {
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let export = &entry.export;
        let path = cc_path(&export.path, root);
        let line_str = export.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/deprecated-export-in-use",
            &path,
            &line_str,
            &export.export_name,
        ]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/deprecated-export-in-use",
                description: &export.description(),
                severity: level,
                category: "Compatibility",
                path: &path,
                begin_line: Some(export.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_type_only_dep_issues(
    issues: &mut Vec<CodeClimateIssue>,
    deps: &[fallow_types::output_dead_code::TypeOnlyDependencyFinding],
    root: &Path,
    severity: Severity,
) {
    if deps.is_empty() {
        return;
    }
    for entry in deps {
        let level = finding_codeclimate(entry, severity);
        let dep = &entry.dep;
        let path = cc_path(&dep.path, root);
        let line = if dep.line > 0 { Some(dep.line) } else { None };
        let fp = codeclimate_fingerprint_hash(&["fallow/type-only-dependency", &dep.package_name]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/type-only-dependency",
                description: &format!(
                    "Package '{}' is only imported via type-only imports (consider moving to devDependencies)",
                    dep.package_name
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_test_only_dep_issues(
    issues: &mut Vec<CodeClimateIssue>,
    deps: &[fallow_types::output_dead_code::TestOnlyDependencyFinding],
    root: &Path,
    severity: Severity,
) {
    if deps.is_empty() {
        return;
    }
    for entry in deps {
        let level = finding_codeclimate(entry, severity);
        let dep = &entry.dep;
        let path = cc_path(&dep.path, root);
        let line = if dep.line > 0 { Some(dep.line) } else { None };
        let fp = codeclimate_fingerprint_hash(&["fallow/test-only-dependency", &dep.package_name]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/test-only-dependency",
                description: &format!(
                    "Package '{}' is only imported by test files (consider moving to devDependencies)",
                    dep.package_name
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_dev_dep_in_prod_issues(
    issues: &mut Vec<CodeClimateIssue>,
    deps: &[fallow_types::output_dead_code::DevDependencyInProductionFinding],
    root: &Path,
    severity: Severity,
) {
    if deps.is_empty() {
        return;
    }
    for entry in deps {
        let level = finding_codeclimate(entry, severity);
        let dep = &entry.dep;
        let path = cc_path(&dep.path, root);
        let line = if dep.line > 0 { Some(dep.line) } else { None };
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/dev-dependency-in-production",
            &dep.package_name,
        ]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/dev-dependency-in-production",
                description: &format!(
                    "devDependency '{}' is imported by production code at runtime (consider moving to dependencies)",
                    dep.package_name
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

/// Push CodeClimate issues for unused enum or class members.
///
/// `entity_label` is `"Enum"` or `"Class"` so the rendered description reads
/// "Enum member ..." or "Class member ..." accordingly.
fn push_unused_member_issues<'a, I>(
    issues: &mut Vec<CodeClimateIssue>,
    members: I,
    root: &Path,
    rule_id: &str,
    entity_label: &str,
    severity: Severity,
) where
    I: IntoIterator<
        Item = (
            &'a fallow_types::results::UnusedMember,
            &'a [ReachabilityCaveat],
            Option<EffectiveSeverity>,
            Option<&'a str>,
        ),
    >,
{
    for (member, caveats, effective, finding_id) in members {
        let level = gate_codeclimate(effective, severity);
        let path = cc_path(&member.path, root);
        let line_str = member.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            rule_id,
            &path,
            &line_str,
            &member.parent_name,
            &member.member_name,
        ]);
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: rule_id,
                description: &format!(
                    "{entity_label} member '{}.{}' is never referenced{}",
                    member.parent_name,
                    member.member_name,
                    cc_caveat_suffix(caveats)
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(member.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unresolved_import_issues(
    issues: &mut Vec<CodeClimateIssue>,
    imports: &[fallow_types::output_dead_code::UnresolvedImportFinding],
    root: &Path,
    severity: Severity,
) {
    if imports.is_empty() {
        return;
    }
    for entry in imports {
        let level = finding_codeclimate(entry, severity);
        let import = &entry.import;
        let path = cc_path(&import.path, root);
        let line_str = import.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unresolved-import",
            &path,
            &line_str,
            &import.specifier,
        ]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unresolved-import",
                description: &format!("Import '{}' could not be resolved", import.specifier),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(import.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unlisted_dep_issues(
    issues: &mut Vec<CodeClimateIssue>,
    deps: &[fallow_types::output_dead_code::UnlistedDependencyFinding],
    root: &Path,
    severity: Severity,
) {
    if deps.is_empty() {
        return;
    }
    for entry in deps {
        let level = finding_codeclimate(entry, severity);
        let dep = &entry.dep;
        let sites: Vec<(String, u32, u32)> = dep
            .imported_from
            .iter()
            .map(|site| (cc_path(&site.path, root), site.line, site.col))
            .collect();
        let discriminators = location_discriminators(&sites);
        for ((path, line, _), discriminator) in sites.iter().zip(&discriminators) {
            let line_str = line.to_string();
            let discriminator: Vec<&str> = discriminator.iter().map(String::as_str).collect();
            let fp = codeclimate_fingerprint_hash(&[
                "fallow/unlisted-dependency",
                path,
                &line_str,
                &dep.package_name,
            ]);
            issues.push(dead_code_issue(
                entry.finding_id.as_deref(),
                &discriminator,
                CodeClimateIssueInput {
                    check_name: "fallow/unlisted-dependency",
                    description: &format!(
                        "Package '{}' is imported but not listed in package.json",
                        dep.package_name
                    ),
                    severity: level,
                    category: "Bug Risk",
                    path,
                    begin_line: Some(*line),
                    fingerprint: &fp,
                },
            ));
        }
    }
}

fn push_duplicate_export_issues(
    issues: &mut Vec<CodeClimateIssue>,
    dups: &[fallow_types::output_dead_code::DuplicateExportFinding],
    root: &Path,
    severity: Severity,
) {
    if dups.is_empty() {
        return;
    }
    for dup in dups {
        let level = finding_codeclimate(dup, severity);
        // The finding id of a duplicate export holds the set of its paths, so
        // one more or one less location gives the finding a new id. Each
        // issue is one location, so its fingerprint uses the part of the id
        // that stays: the rule and the export name. The location discriminator
        // adds the path. A saved finding without an id keeps the legacy
        // fingerprint.
        let location_identity = dup
            .finding_id
            .is_some()
            .then(|| dead_code_finding_id("duplicate-export", &[&dup.export.export_name]));
        let finding_id = location_identity.as_deref();
        let dup = &dup.export;
        let locations: Vec<(String, u32, u32)> = dup
            .locations
            .iter()
            .map(|loc| (cc_path(&loc.path, root), loc.line, loc.col))
            .collect();
        let discriminators = location_discriminators(&locations);
        for ((path, line, _), discriminator) in locations.iter().zip(&discriminators) {
            let line_str = line.to_string();
            let discriminator: Vec<&str> = discriminator.iter().map(String::as_str).collect();
            let fp = codeclimate_fingerprint_hash(&[
                "fallow/duplicate-export",
                path,
                &line_str,
                &dup.export_name,
            ]);
            issues.push(dead_code_issue(
                finding_id,
                &discriminator,
                CodeClimateIssueInput {
                    check_name: "fallow/duplicate-export",
                    description: &format!(
                        "Export '{}' appears in multiple modules",
                        dup.export_name
                    ),
                    severity: level,
                    category: "Bug Risk",
                    path,
                    begin_line: Some(*line),
                    fingerprint: &fp,
                },
            ));
        }
    }
}

fn push_circular_dep_issues(
    issues: &mut Vec<CodeClimateIssue>,
    cycles: &[fallow_types::output_dead_code::CircularDependencyFinding],
    root: &Path,
    severity: Severity,
) {
    if cycles.is_empty() {
        return;
    }
    for entry in cycles {
        let level = finding_codeclimate(entry, severity);
        let cycle = &entry.cycle;
        let Some(first) = cycle.files.first() else {
            continue;
        };
        let path = cc_path(first, root);
        let chain: Vec<String> = cycle.files.iter().map(|f| cc_path(f, root)).collect();
        let chain_str = chain.join(":");
        let fp = codeclimate_fingerprint_hash(&["fallow/circular-dependency", &chain_str]);
        let line = if cycle.line > 0 {
            Some(cycle.line)
        } else {
            None
        };
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/circular-dependency",
                description: &format!(
                    "Circular dependency{}: {}",
                    if cycle.is_cross_package {
                        " (cross-package)"
                    } else {
                        ""
                    },
                    chain.join(" \u{2192} ")
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_re_export_cycle_issues(
    issues: &mut Vec<CodeClimateIssue>,
    cycles: &[fallow_types::output_dead_code::ReExportCycleFinding],
    root: &Path,
    severity: Severity,
) {
    if cycles.is_empty() {
        return;
    }
    for entry in cycles {
        let level = finding_codeclimate(entry, severity);
        let cycle = &entry.cycle;
        let Some(first) = cycle.files.first() else {
            continue;
        };
        let path = cc_path(first, root);
        let chain: Vec<String> = cycle.files.iter().map(|f| cc_path(f, root)).collect();
        let chain_str = chain.join(":");
        let kind_token = match cycle.kind {
            fallow_types::results::ReExportCycleKind::SelfLoop => "self-loop",
            fallow_types::results::ReExportCycleKind::MultiNode => "multi-node",
        };
        let kind_tag = match cycle.kind {
            fallow_types::results::ReExportCycleKind::SelfLoop => " (self-loop)",
            fallow_types::results::ReExportCycleKind::MultiNode => "",
        };
        let fp = codeclimate_fingerprint_hash(&["fallow/re-export-cycle", kind_token, &chain_str]);
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/re-export-cycle",
                description: &format!("Re-export cycle{}: {}", kind_tag, chain.join(" <-> ")),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: None,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_package_cycle_issues(
    issues: &mut Vec<CodeClimateIssue>,
    cycles: &[fallow_types::output_dead_code::PackageCycleFinding],
    root: &Path,
    severity: Severity,
) {
    for entry in cycles {
        let level = finding_codeclimate(entry, severity);
        let cycle = &entry.cycle;
        let Some(anchor) = cycle.edges.first() else {
            continue;
        };
        let path = cc_path(&anchor.path, root);
        let packages = cycle.packages.join(":");
        let fp = codeclimate_fingerprint_hash(&["fallow/package-cycle", &packages]);
        let note = if cycle.group_truncated {
            format!(
                " ({})",
                fallow_types::results::PackageCycle::GROUP_TRUNCATED_NOTE
            )
        } else {
            String::new()
        };
        issues.push(build_codeclimate_issue(CodeClimateIssueInput {
            check_name: "fallow/package-cycle",
            description: &format!("Package cycle: {}{note}", cycle.chain(" \u{2192} ")),
            severity: level,
            category: "Bug Risk",
            path: &path,
            begin_line: (anchor.line > 0).then_some(anchor.line),
            fingerprint: &fp,
        }));
    }
}

fn push_boundary_violation_issues(
    issues: &mut Vec<CodeClimateIssue>,
    violations: &[fallow_types::output_dead_code::BoundaryViolationFinding],
    root: &Path,
    severity: Severity,
) {
    if violations.is_empty() {
        return;
    }
    for entry in violations {
        let level = finding_codeclimate(entry, severity);
        let v = &entry.violation;
        let path = cc_path(&v.from_path, root);
        let to = cc_path(&v.to_path, root);
        let fp = codeclimate_fingerprint_hash(&["fallow/boundary-violation", &path, &to]);
        let line = if v.line > 0 { Some(v.line) } else { None };
        let via = v
            .via_path
            .as_ref()
            .map_or_else(String::new, |via| format!(", via {}", cc_path(via, root)));
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/boundary-violation",
                description: &format!(
                    "Boundary violation: {} -> {} ({} -> {}{})",
                    path, to, v.from_zone, v.to_zone, via
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_boundary_coverage_issues(
    issues: &mut Vec<CodeClimateIssue>,
    violations: &[fallow_types::output_dead_code::BoundaryCoverageViolationFinding],
    root: &Path,
    severity: Severity,
) {
    if violations.is_empty() {
        return;
    }
    for entry in violations {
        let level = finding_codeclimate(entry, severity);
        let v = &entry.violation;
        let path = cc_path(&v.path, root);
        let fp = codeclimate_fingerprint_hash(&["fallow/boundary-coverage", &path]);
        let line = if v.line > 0 { Some(v.line) } else { None };
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/boundary-coverage",
                description: &format!("Boundary coverage: {path} matches no configured zone"),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_boundary_call_issues(
    issues: &mut Vec<CodeClimateIssue>,
    violations: &[fallow_types::output_dead_code::BoundaryCallViolationFinding],
    root: &Path,
    severity: Severity,
) {
    if violations.is_empty() {
        return;
    }
    for entry in violations {
        let level = finding_codeclimate(entry, severity);
        let v = &entry.violation;
        let path = cc_path(&v.path, root);
        let fp =
            codeclimate_fingerprint_hash(&["fallow/boundary-call-violation", &path, &v.callee]);
        let line = if v.line > 0 { Some(v.line) } else { None };
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/boundary-call-violation",
                description: &format!(
                    "Boundary call: `{}` matches forbidden pattern `{}` in zone '{}'",
                    v.callee, v.pattern, v.zone
                ),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_policy_violation_issues(
    issues: &mut Vec<CodeClimateIssue>,
    violations: &[fallow_types::output_dead_code::PolicyViolationFinding],
    root: &Path,
) {
    use fallow_types::results::PolicyViolationSeverity;

    for entry in violations {
        let v = &entry.violation;
        let path = cc_path(&v.path, root);
        let rule = format!("{}/{}", v.pack, v.rule_id);
        let fp =
            codeclimate_fingerprint_hash(&["fallow/policy-violation", &path, &rule, &v.matched]);
        let line = if v.line > 0 { Some(v.line) } else { None };
        // Severity comes from the EFFECTIVE per-finding value, not the
        // policy-violation master, so a severity: "error" rule under a warn
        // master maps to blocker-level just like the exit-code gate.
        let level = severity_to_codeclimate(match v.severity {
            PolicyViolationSeverity::Error => Severity::Error,
            PolicyViolationSeverity::Warn => Severity::Warn,
        });
        let message = match &v.message {
            Some(message) => format!(
                "Policy violation: `{}` is banned by `{rule}`. {message}",
                v.matched
            ),
            None => format!("Policy violation: `{}` is banned by `{rule}`", v.matched),
        };
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/policy-violation",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_invalid_client_export_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::InvalidClientExportFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let e = &entry.export;
        let path = cc_path(&e.path, root);
        let fp =
            codeclimate_fingerprint_hash(&["fallow/invalid-client-export", &path, &e.export_name]);
        let line = if e.line > 0 { Some(e.line) } else { None };
        let message = format!(
            "Export `{}` is not allowed in a \"{}\" file (Next.js server-only / route-config name)",
            e.export_name, e.directive
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/invalid-client-export",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_mixed_client_server_barrel_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::MixedClientServerBarrelFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let b = &entry.barrel;
        let path = cc_path(&b.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/mixed-client-server-barrel",
            &path,
            &b.client_origin,
            &b.server_origin,
        ]);
        let line = if b.line > 0 { Some(b.line) } else { None };
        let message = format!(
            "Barrel re-exports both a \"use client\" module (`{}`) and a server-only module (`{}`); one import drags the other's directive across the boundary",
            b.client_origin, b.server_origin
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/mixed-client-server-barrel",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_misplaced_directive_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::MisplacedDirectiveFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let d = &entry.directive_site;
        let path = cc_path(&d.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/misplaced-directive",
            &path,
            &d.line.to_string(),
            &d.directive,
        ]);
        let line = if d.line > 0 { Some(d.line) } else { None };
        let message = format!(
            "Directive `\"{}\"` is not in the leading position, so the RSC bundler ignores it; move it to the top of the file",
            d.directive
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/misplaced-directive",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unprovided_inject_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnprovidedInjectFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let i = &entry.inject;
        let path = cc_path(&i.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unprovided-inject",
            &path,
            &i.line.to_string(),
            &i.key_name,
        ]);
        let line = if i.line > 0 { Some(i.line) } else { None };
        let message = format!(
            "inject(`{}`) has no matching provide(`{}`) in this project; at runtime it returns undefined (provide the key or remove this inject)",
            i.key_name, i.key_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unprovided-inject",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unrendered_component_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnrenderedComponentFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let c = &entry.component;
        let path = cc_path(&c.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unrendered-component",
            &path,
            &c.line.to_string(),
            &c.component_name,
        ]);
        let line = if c.line > 0 { Some(c.line) } else { None };
        let message = format!(
            "component `{}` is reachable but rendered nowhere in this project (render it somewhere or remove it)",
            c.component_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unrendered-component",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_component_prop_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedComponentPropFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let p = &entry.prop;
        let path = cc_path(&p.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-component-prop",
            &path,
            &p.line.to_string(),
            &p.prop_name,
        ]);
        let line = if p.line > 0 { Some(p.line) } else { None };
        let message = format!(
            "prop `{}` is declared but referenced nowhere in component `{}` (remove it or use it)",
            p.prop_name, p.component_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-component-prop",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_component_emit_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedComponentEmitFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let e = &entry.emit;
        let path = cc_path(&e.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-component-emit",
            &path,
            &e.line.to_string(),
            &e.emit_name,
        ]);
        let line = if e.line > 0 { Some(e.line) } else { None };
        let message = format!(
            "emit `{}` is declared but emitted nowhere in component `{}` (remove it or emit it)",
            e.emit_name, e.component_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-component-emit",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_svelte_event_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedSvelteEventFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let e = &entry.event;
        let path = cc_path(&e.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-svelte-event",
            &path,
            &e.line.to_string(),
            &e.event_name,
        ]);
        let line = if e.line > 0 { Some(e.line) } else { None };
        let message = format!(
            "event `{}` is dispatched by component `{}` but listened to nowhere in the project (remove it or listen for it)",
            e.event_name, e.component_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-svelte-event",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_component_input_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedComponentInputFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let i = &entry.input;
        let path = cc_path(&i.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-component-input",
            &path,
            &i.line.to_string(),
            &i.input_name,
        ]);
        let line = if i.line > 0 { Some(i.line) } else { None };
        let message = format!(
            "input `{}` is declared but referenced nowhere in component `{}` (remove it or use it)",
            i.input_name, i.component_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-component-input",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_component_output_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedComponentOutputFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let o = &entry.output;
        let path = cc_path(&o.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-component-output",
            &path,
            &o.line.to_string(),
            &o.output_name,
        ]);
        let line = if o.line > 0 { Some(o.line) } else { None };
        let message = format!(
            "output `{}` is declared but emitted nowhere in component `{}` (remove it or emit it)",
            o.output_name, o.component_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-component-output",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_server_action_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedServerActionFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let a = &entry.action;
        let path = cc_path(&a.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-server-action",
            &path,
            &a.line.to_string(),
            &a.action_name,
        ]);
        let line = if a.line > 0 { Some(a.line) } else { None };
        let message = format!(
            "server action `{}` is exported from a \"use server\" file but no code in this project references it (wire it to a consumer or remove it)",
            a.action_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-server-action",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_load_data_key_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedLoadDataKeyFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let k = &entry.key;
        let path = cc_path(&k.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-load-data-key",
            &path,
            &k.line.to_string(),
            &k.key_name,
        ]);
        let line = if k.line > 0 { Some(k.line) } else { None };
        let message = format!(
            "load() return key `{}` is read by no consumer (sibling +page.svelte data.<key> or project-wide page.data.<key>); delete the key or wire a consumer",
            k.key_name
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-load-data-key",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_route_collision_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::RouteCollisionFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let c = &entry.collision;
        let path = cc_path(&c.path, root);
        let fp = codeclimate_fingerprint_hash(&["fallow/route-collision", &path, &c.url]);
        let line = if c.line > 0 { Some(c.line) } else { None };
        let message = format!(
            "Route file resolves to `{}`, also owned by {} other file(s); Next.js fails the build because a URL can have only one owner",
            c.url,
            c.conflicting_paths.len()
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/route-collision",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_dynamic_segment_name_conflict_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::DynamicSegmentNameConflictFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for entry in findings {
        let level = finding_codeclimate(entry, severity);
        let c = &entry.conflict;
        let path = cc_path(&c.path, root);
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/dynamic-segment-name-conflict",
            &path,
            &c.position,
        ]);
        let line = if c.line > 0 { Some(c.line) } else { None };
        let message = format!(
            "Dynamic segments at `{}` use different slug names ({}); Next.js requires one consistent name per dynamic path",
            c.position,
            c.conflicting_segments.join(", ")
        );
        issues.push(dead_code_issue(
            entry.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/dynamic-segment-name-conflict",
                description: &message,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: line,
                fingerprint: &fp,
            },
        ));
    }
}

fn push_stale_suppression_issues(
    issues: &mut Vec<CodeClimateIssue>,
    suppressions: &[fallow_types::results::StaleSuppression],
    root: &Path,
    rules: &RulesConfig,
) {
    if suppressions.is_empty() {
        return;
    }
    for s in suppressions {
        let severity = if s.missing_reason {
            rules.require_suppression_reason
        } else {
            rules.stale_suppressions
        };
        let level = finding_codeclimate(s, severity);
        let path = cc_path(&s.path, root);
        let line_str = s.line.to_string();
        let check_name = if s.missing_reason {
            "fallow/missing-suppression-reason"
        } else {
            "fallow/stale-suppression"
        };
        let fp = codeclimate_fingerprint_hash(&[check_name, &path, &line_str]);
        issues.push(dead_code_issue(
            s.finding_id.as_deref(),
            &[],
            CodeClimateIssueInput {
                check_name,
                description: &s.display_message(),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(s.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_catalog_entry_issues(
    issues: &mut Vec<CodeClimateIssue>,
    entries: &[fallow_types::output_dead_code::UnusedCatalogEntryFinding],
    root: &Path,
    severity: Severity,
) {
    if entries.is_empty() {
        return;
    }
    for entry in entries {
        let level = finding_codeclimate(entry, severity);
        let finding_id = entry.finding_id.as_deref();
        let entry = &entry.entry;
        let path = cc_path(&entry.path, root);
        let line_str = entry.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-catalog-entry",
            &path,
            &line_str,
            &entry.catalog_name,
            &entry.entry_name,
        ]);
        let description = if entry.catalog_name == "default" {
            format!(
                "Catalog entry '{}' is not referenced by any workspace package",
                entry.entry_name
            )
        } else {
            format!(
                "Catalog entry '{}' (catalog '{}') is not referenced by any workspace package",
                entry.entry_name, entry.catalog_name
            )
        };
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-catalog-entry",
                description: &description,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(entry.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unresolved_catalog_reference_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnresolvedCatalogReferenceFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for finding in findings {
        let level = finding_codeclimate(finding, severity);
        let finding_id = finding.finding_id.as_deref();
        let finding = &finding.reference;
        let path = cc_path(&finding.path, root);
        let line_str = finding.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unresolved-catalog-reference",
            &path,
            &line_str,
            &finding.catalog_name,
            &finding.entry_name,
        ]);
        let catalog_phrase = if finding.catalog_name == "default" {
            "the default catalog".to_string()
        } else {
            format!("catalog '{}'", finding.catalog_name)
        };
        let mut description = format!(
            "Package '{}' is referenced via `catalog:{}` but {} does not declare it; `pnpm install` will fail",
            finding.entry_name,
            if finding.catalog_name == "default" {
                ""
            } else {
                finding.catalog_name.as_str()
            },
            catalog_phrase,
        );
        if !finding.available_in_catalogs.is_empty() {
            use std::fmt::Write as _;
            let _ = write!(
                description,
                " (available in: {})",
                finding.available_in_catalogs.join(", ")
            );
        }
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unresolved-catalog-reference",
                description: &description,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(finding.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_empty_catalog_group_issues(
    issues: &mut Vec<CodeClimateIssue>,
    groups: &[fallow_types::output_dead_code::EmptyCatalogGroupFinding],
    root: &Path,
    severity: Severity,
) {
    if groups.is_empty() {
        return;
    }
    for group in groups {
        let level = finding_codeclimate(group, severity);
        let finding_id = group.finding_id.as_deref();
        let group = &group.group;
        let path = cc_path(&group.path, root);
        let line_str = group.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/empty-catalog-group",
            &path,
            &line_str,
            &group.catalog_name,
        ]);
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/empty-catalog-group",
                description: &format!("Catalog group '{}' has no entries", group.catalog_name),
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(group.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_unused_dependency_override_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::UnusedDependencyOverrideFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for finding in findings {
        let level = finding_codeclimate(finding, severity);
        let finding_id = finding.finding_id.as_deref();
        let finding = &finding.entry;
        let path = cc_path(&finding.path, root);
        let line_str = finding.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/unused-dependency-override",
            &path,
            &line_str,
            finding.source.as_label(),
            &finding.raw_key,
        ]);
        let mut description = format!(
            "Override `{}` forces version `{}` but `{}` is not declared by any workspace package or resolved in the lockfile",
            finding.raw_key, finding.version_range, finding.target_package,
        );
        if let Some(hint) = &finding.hint {
            use std::fmt::Write as _;
            let _ = write!(description, " ({hint})");
        }
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/unused-dependency-override",
                description: &description,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(finding.line),
                fingerprint: &fp,
            },
        ));
    }
}

fn push_misconfigured_dependency_override_issues(
    issues: &mut Vec<CodeClimateIssue>,
    findings: &[fallow_types::output_dead_code::MisconfiguredDependencyOverrideFinding],
    root: &Path,
    severity: Severity,
) {
    if findings.is_empty() {
        return;
    }
    for finding in findings {
        let level = finding_codeclimate(finding, severity);
        let finding_id = finding.finding_id.as_deref();
        let finding = &finding.entry;
        let path = cc_path(&finding.path, root);
        let line_str = finding.line.to_string();
        let fp = codeclimate_fingerprint_hash(&[
            "fallow/misconfigured-dependency-override",
            &path,
            &line_str,
            finding.source.as_label(),
            &finding.raw_key,
        ]);
        let description = format!(
            "Override `{}` -> `{}` is malformed: {}",
            finding.raw_key,
            finding.raw_value,
            finding.reason.describe(),
        );
        issues.push(dead_code_issue(
            finding_id,
            &[],
            CodeClimateIssueInput {
                check_name: "fallow/misconfigured-dependency-override",
                description: &description,
                severity: level,
                category: "Bug Risk",
                path: &path,
                begin_line: Some(finding.line),
                fingerprint: &fp,
            },
        ));
    }
}

/// Build CodeClimate issues from dead-code analysis results.
///
/// Returns the typed [`CodeClimateIssue`] vec; callers that emit the wire
/// shape convert via [`fallow_output::codeclimate_issues_to_value`]. The schema
/// drift gate locks the per-issue shape against
/// [`fallow_output::CodeClimateOutput`].
#[must_use]
pub fn build_codeclimate(
    results: &AnalysisResults,
    root: &Path,
    rules: &RulesConfig,
) -> Vec<CodeClimateIssue> {
    CodeClimateBuilder {
        issues: Vec::new(),
        results,
        root,
        rules,
    }
    .build()
}

struct CodeClimateBuilder<'a> {
    issues: Vec<CodeClimateIssue>,
    results: &'a AnalysisResults,
    root: &'a Path,
    rules: &'a RulesConfig,
}

impl CodeClimateBuilder<'_> {
    fn build(mut self) -> Vec<CodeClimateIssue> {
        self.push_file_and_export_issues();
        self.push_private_type_leak_issues();
        push_deprecated_export_issues(
            &mut self.issues,
            &self.results.deprecated_exports_in_use,
            self.root,
            self.rules.deprecated_exports_in_use,
        );
        self.push_package_dependency_issues();
        self.push_type_test_dependency_issues();
        self.push_member_issues();
        self.push_import_and_duplicate_issues();
        self.push_graph_issues();
        self.push_boundary_issues();
        self.push_suppression_and_catalog_issues();
        self.push_override_issues();
        self.issues
    }

    fn push_file_and_export_issues(&mut self) {
        push_unused_file_issues(
            &mut self.issues,
            &self.results.unused_files,
            self.root,
            self.rules.unused_files,
        );
        push_unused_export_issues(UnusedExportIssuesInput {
            issues: &mut self.issues,
            exports: self.results.unused_exports.iter().map(|e| {
                (
                    &e.export,
                    e.reachability_caveats.as_slice(),
                    e.effective_severity,
                    e.finding_id.as_deref(),
                )
            }),
            root: self.root,
            rule_id: "fallow/unused-export",
            direct_label: "Export",
            re_export_label: "Re-export",
            severity: self.rules.unused_exports,
        });
        push_unused_export_issues(UnusedExportIssuesInput {
            issues: &mut self.issues,
            exports: self.results.unused_types.iter().map(|e| {
                (
                    &e.export,
                    e.reachability_caveats.as_slice(),
                    e.effective_severity,
                    e.finding_id.as_deref(),
                )
            }),
            root: self.root,
            rule_id: "fallow/unused-type",
            direct_label: "Type export",
            re_export_label: "Type re-export",
            severity: self.rules.unused_types,
        });
    }

    fn push_private_type_leak_issues(&mut self) {
        push_private_type_leak_issues(
            &mut self.issues,
            &self.results.private_type_leaks,
            self.root,
            self.rules.private_type_leaks,
        );
    }

    fn push_package_dependency_issues(&mut self) {
        push_dep_cc_issues(
            &mut self.issues,
            self.results.unused_dependencies.iter().map(|f| {
                (
                    &f.dep,
                    f.reachability_caveats.as_slice(),
                    f.effective_severity,
                    f.finding_id.as_deref(),
                )
            }),
            self.root,
            "fallow/unused-dependency",
            "dependencies",
            self.rules.unused_dependencies,
        );
        push_dep_cc_issues(
            &mut self.issues,
            self.results.unused_dev_dependencies.iter().map(|f| {
                (
                    &f.dep,
                    f.reachability_caveats.as_slice(),
                    f.effective_severity,
                    f.finding_id.as_deref(),
                )
            }),
            self.root,
            "fallow/unused-dev-dependency",
            "devDependencies",
            self.rules.unused_dev_dependencies,
        );
        push_dep_cc_issues(
            &mut self.issues,
            self.results.unused_optional_dependencies.iter().map(|f| {
                (
                    &f.dep,
                    f.reachability_caveats.as_slice(),
                    f.effective_severity,
                    f.finding_id.as_deref(),
                )
            }),
            self.root,
            "fallow/unused-optional-dependency",
            "optionalDependencies",
            self.rules.unused_optional_dependencies,
        );
    }

    fn push_type_test_dependency_issues(&mut self) {
        push_type_only_dep_issues(
            &mut self.issues,
            &self.results.type_only_dependencies,
            self.root,
            self.rules.type_only_dependencies,
        );
        push_test_only_dep_issues(
            &mut self.issues,
            &self.results.test_only_dependencies,
            self.root,
            self.rules.test_only_dependencies,
        );
        push_dev_dep_in_prod_issues(
            &mut self.issues,
            &self.results.dev_dependencies_in_production,
            self.root,
            self.rules.dev_dependencies_in_production,
        );
    }

    fn push_member_issues(&mut self) {
        push_unused_member_issues(
            &mut self.issues,
            self.results.unused_enum_members.iter().map(|m| {
                (
                    &m.member,
                    m.reachability_caveats.as_slice(),
                    m.effective_severity,
                    m.finding_id.as_deref(),
                )
            }),
            self.root,
            "fallow/unused-enum-member",
            "Enum",
            self.rules.unused_enum_members,
        );
        push_unused_member_issues(
            &mut self.issues,
            self.results.unused_class_members.iter().map(|m| {
                (
                    &m.member,
                    m.reachability_caveats.as_slice(),
                    m.effective_severity,
                    m.finding_id.as_deref(),
                )
            }),
            self.root,
            "fallow/unused-class-member",
            "Class",
            self.rules.unused_class_members,
        );
        push_unused_member_issues(
            &mut self.issues,
            self.results.unused_store_members.iter().map(|m| {
                (
                    &m.member,
                    m.reachability_caveats.as_slice(),
                    m.effective_severity,
                    m.finding_id.as_deref(),
                )
            }),
            self.root,
            "fallow/unused-store-member",
            "Store",
            self.rules.unused_store_members,
        );
    }

    fn push_import_and_duplicate_issues(&mut self) {
        push_unresolved_import_issues(
            &mut self.issues,
            &self.results.unresolved_imports,
            self.root,
            self.rules.unresolved_imports,
        );
        push_unlisted_dep_issues(
            &mut self.issues,
            &self.results.unlisted_dependencies,
            self.root,
            self.rules.unlisted_dependencies,
        );
        push_duplicate_export_issues(
            &mut self.issues,
            &self.results.duplicate_exports,
            self.root,
            self.rules.duplicate_exports,
        );
    }

    fn push_graph_issues(&mut self) {
        push_circular_dep_issues(
            &mut self.issues,
            &self.results.circular_dependencies,
            self.root,
            self.rules.circular_dependencies,
        );
        push_re_export_cycle_issues(
            &mut self.issues,
            &self.results.re_export_cycles,
            self.root,
            self.rules.re_export_cycle,
        );
        push_package_cycle_issues(
            &mut self.issues,
            &self.results.package_cycles,
            self.root,
            self.rules.package_cycle,
        );
    }

    fn push_boundary_issues(&mut self) {
        self.push_architecture_boundary_issues();
        self.push_client_server_boundary_issues();
        self.push_component_boundary_issues();
        self.push_framework_route_issues();
    }

    fn push_architecture_boundary_issues(&mut self) {
        push_boundary_violation_issues(
            &mut self.issues,
            &self.results.boundary_violations,
            self.root,
            self.rules.boundary_violation,
        );
        push_boundary_coverage_issues(
            &mut self.issues,
            &self.results.boundary_coverage_violations,
            self.root,
            self.rules.boundary_violation,
        );
        push_boundary_call_issues(
            &mut self.issues,
            &self.results.boundary_call_violations,
            self.root,
            self.rules.boundary_violation,
        );
        push_policy_violation_issues(&mut self.issues, &self.results.policy_violations, self.root);
    }

    fn push_client_server_boundary_issues(&mut self) {
        push_invalid_client_export_issues(
            &mut self.issues,
            &self.results.invalid_client_exports,
            self.root,
            self.rules.invalid_client_export,
        );
        push_mixed_client_server_barrel_issues(
            &mut self.issues,
            &self.results.mixed_client_server_barrels,
            self.root,
            self.rules.mixed_client_server_barrel,
        );
        push_misplaced_directive_issues(
            &mut self.issues,
            &self.results.misplaced_directives,
            self.root,
            self.rules.misplaced_directive,
        );
    }

    fn push_component_boundary_issues(&mut self) {
        push_unprovided_inject_issues(
            &mut self.issues,
            &self.results.unprovided_injects,
            self.root,
            self.rules.unprovided_injects,
        );
        push_unrendered_component_issues(
            &mut self.issues,
            &self.results.unrendered_components,
            self.root,
            self.rules.unrendered_components,
        );
        push_unused_component_prop_issues(
            &mut self.issues,
            &self.results.unused_component_props,
            self.root,
            self.rules.unused_component_props,
        );
        push_unused_component_emit_issues(
            &mut self.issues,
            &self.results.unused_component_emits,
            self.root,
            self.rules.unused_component_emits,
        );
        push_unused_component_input_issues(
            &mut self.issues,
            &self.results.unused_component_inputs,
            self.root,
            self.rules.unused_component_inputs,
        );
        push_unused_component_output_issues(
            &mut self.issues,
            &self.results.unused_component_outputs,
            self.root,
            self.rules.unused_component_outputs,
        );
        push_unused_svelte_event_issues(
            &mut self.issues,
            &self.results.unused_svelte_events,
            self.root,
            self.rules.unused_svelte_events,
        );
    }

    fn push_framework_route_issues(&mut self) {
        push_unused_server_action_issues(
            &mut self.issues,
            &self.results.unused_server_actions,
            self.root,
            self.rules.unused_server_actions,
        );
        push_unused_load_data_key_issues(
            &mut self.issues,
            &self.results.unused_load_data_keys,
            self.root,
            self.rules.unused_load_data_keys,
        );
        push_route_collision_issues(
            &mut self.issues,
            &self.results.route_collisions,
            self.root,
            self.rules.route_collision,
        );
        push_dynamic_segment_name_conflict_issues(
            &mut self.issues,
            &self.results.dynamic_segment_name_conflicts,
            self.root,
            self.rules.dynamic_segment_name_conflict,
        );
    }

    fn push_suppression_and_catalog_issues(&mut self) {
        push_stale_suppression_issues(
            &mut self.issues,
            &self.results.stale_suppressions,
            self.root,
            self.rules,
        );
        push_unused_catalog_entry_issues(
            &mut self.issues,
            &self.results.unused_catalog_entries,
            self.root,
            self.rules.unused_catalog_entries,
        );
        push_empty_catalog_group_issues(
            &mut self.issues,
            &self.results.empty_catalog_groups,
            self.root,
            self.rules.empty_catalog_groups,
        );
        push_unresolved_catalog_reference_issues(
            &mut self.issues,
            &self.results.unresolved_catalog_references,
            self.root,
            self.rules.unresolved_catalog_references,
        );
    }

    fn push_override_issues(&mut self) {
        push_unused_dependency_override_issues(
            &mut self.issues,
            &self.results.unused_dependency_overrides,
            self.root,
            self.rules.unused_dependency_overrides,
        );
        push_misconfigured_dependency_override_issues(
            &mut self.issues,
            &self.results.misconfigured_dependency_overrides,
            self.root,
            self.rules.misconfigured_dependency_overrides,
        );
    }
}

#[cfg(test)]
mod tests {
    use std::collections::BTreeSet;

    use fallow_output::issue_output_contracts;

    fn codeclimate_check_name_literals() -> BTreeSet<String> {
        let source = include_str!("dead_code_codeclimate.rs")
            .split("#[cfg(test)]")
            .next()
            .expect("source before tests");
        let mut literals = BTreeSet::new();
        let mut rest = source;
        while let Some(start) = rest.find("\"fallow/") {
            let after_quote = &rest[start + 1..];
            let Some(end) = after_quote.find('"') else {
                break;
            };
            literals.insert(after_quote[..end].to_owned());
            rest = &after_quote[end + 1..];
        }
        literals
    }

    #[test]
    fn codeclimate_check_names_match_issue_contracts() {
        let from_emitter = codeclimate_check_name_literals();
        let from_contracts = issue_output_contracts()
            .flat_map(|contract| contract.codeclimate_check_names)
            .collect::<BTreeSet<_>>();

        assert_eq!(from_emitter, from_contracts);
    }

    mod caveats {
        use std::path::{Path, PathBuf};

        use fallow_config::RulesConfig;
        use fallow_types::extract::MemberKind;
        use fallow_types::output_dead_code::{
            ReachabilityCaveat, UnusedClassMemberFinding, UnusedDependencyFinding,
            UnusedEnumMemberFinding, UnusedExportFinding, UnusedFileFinding,
            UnusedStoreMemberFinding,
        };
        use fallow_types::results::{
            AnalysisResults, DependencyLocation, UnusedDependency, UnusedExport, UnusedFile,
            UnusedMember,
        };

        use crate::dead_code_codeclimate::build_codeclimate;

        /// One finding of each caveated kind, caveated or not.
        fn results_with(root: &Path, caveated: bool) -> AnalysisResults {
            let caveats = if caveated {
                vec![ReachabilityCaveat::IncompleteImportGraph]
            } else {
                Vec::new()
            };
            let mut results = AnalysisResults::default();

            let mut file = UnusedFileFinding::with_actions(UnusedFile {
                path: root.join("src/lib.ts"),
            });
            file.reachability_caveats.clone_from(&caveats);
            results.unused_files.push(file);

            let mut export = UnusedExportFinding::with_actions(UnusedExport {
                path: root.join("src/lib.ts"),
                export_name: "needed".to_owned(),
                is_type_only: false,
                line: 3,
                col: 0,
                span_start: 0,
                is_re_export: false,
                deprecated: false,
                deprecated_reason: None,
            });
            export.reachability_caveats.clone_from(&caveats);
            results.unused_exports.push(export);

            let mut dep = UnusedDependencyFinding::with_actions(UnusedDependency {
                package_name: "left-pad".to_owned(),
                location: DependencyLocation::Dependencies,
                path: root.join("package.json"),
                line: 5,
                used_in_workspaces: Vec::new(),
            });
            dep.reachability_caveats.clone_from(&caveats);
            results.unused_dependencies.push(dep);

            let member = |parent: &str, name: &str, kind| UnusedMember {
                path: root.join("src/lib.ts"),
                parent_name: parent.to_owned(),
                member_name: name.to_owned(),
                kind,
                line: 7,
                col: 2,
            };

            let mut enum_member = UnusedEnumMemberFinding::with_actions(member(
                "Mode",
                "Legacy",
                MemberKind::EnumMember,
            ));
            enum_member.reachability_caveats.clone_from(&caveats);
            results.unused_enum_members.push(enum_member);

            let mut class_member = UnusedClassMemberFinding::with_actions(member(
                "Widget",
                "render",
                MemberKind::ClassMethod,
            ));
            class_member.reachability_caveats.clone_from(&caveats);
            results.unused_class_members.push(class_member);

            let mut store_member = UnusedStoreMemberFinding::with_actions(member(
                "useCart",
                "subtotal",
                MemberKind::StoreMember,
            ));
            store_member.reachability_caveats.clone_from(&caveats);
            results.unused_store_members.push(store_member);

            results
        }

        /// `description` is the field GitLab renders inline on the MR diff, and
        /// the field `CiIssue` carries into the PR-comment and review-comment
        /// bodies that offer the mutation. A verdict resting on a file the run
        /// never read has to say so there.
        #[test]
        fn descriptions_name_the_caveat() {
            let root = PathBuf::from("/project");

            let issues =
                build_codeclimate(&results_with(&root, true), &root, &RulesConfig::default());

            let descriptions: Vec<&str> = issues
                .iter()
                .map(|issue| issue.description.as_str())
                .collect();
            assert!(
                descriptions
                    .iter()
                    .all(|description| description.ends_with(" (caveat: incomplete import graph)")),
                "every caveated finding hedges its description: {descriptions:?}"
            );
            assert!(
                descriptions.contains(
                    &"File is not reachable from any entry point (caveat: incomplete import graph)"
                ),
                "{descriptions:?}"
            );
        }

        /// A clean run must stay byte-identical, so an integrator diffing
        /// reports across versions sees no churn from a mechanism that did not
        /// fire.
        #[test]
        fn a_clean_run_carries_no_caveat_text() {
            let root = PathBuf::from("/project");

            let issues =
                build_codeclimate(&results_with(&root, false), &root, &RulesConfig::default());

            assert!(
                issues
                    .iter()
                    .all(|issue| !issue.description.contains("caveat")),
                "{:?}",
                issues
                    .iter()
                    .map(|issue| issue.description.as_str())
                    .collect::<Vec<_>>()
            );
        }

        /// The fingerprint is GitLab's and the review layer's comment identity.
        /// It is computed from rule id plus location, never from the message,
        /// so gaining a caveat must not reopen a resolved comment thread.
        #[test]
        fn the_caveat_does_not_move_the_fingerprint() {
            let root = PathBuf::from("/project");

            let clean =
                build_codeclimate(&results_with(&root, false), &root, &RulesConfig::default());
            let caveated =
                build_codeclimate(&results_with(&root, true), &root, &RulesConfig::default());

            let fingerprints = |issues: &[fallow_output::CodeClimateIssue]| {
                issues
                    .iter()
                    .map(|issue| issue.fingerprint.clone())
                    .collect::<Vec<_>>()
            };
            assert_eq!(fingerprints(&clean), fingerprints(&caveated));
            assert_ne!(
                clean[0].description, caveated[0].description,
                "the guard is only meaningful while the description actually changed"
            );
        }
    }

    mod stable_fingerprints {
        use std::path::{Path, PathBuf};

        use fallow_config::RulesConfig;
        use fallow_output::{CodeClimateIssue, codeclimate_fingerprint_hash};
        use fallow_types::identity::stamp_dead_code_finding_ids;
        use fallow_types::output_dead_code::{
            DuplicateExportFinding, UnlistedDependencyFinding, UnusedDependencyFinding,
            UnusedExportFinding,
        };
        use fallow_types::results::{
            AnalysisResults, DependencyLocation, DuplicateExport, DuplicateLocation, ImportSite,
            UnlistedDependency, UnusedDependency, UnusedExport,
        };

        use crate::dead_code_codeclimate::build_codeclimate;

        fn export(root: &Path, name: &str, line: u32) -> UnusedExportFinding {
            UnusedExportFinding::with_actions(UnusedExport {
                path: root.join("src/lib.ts"),
                export_name: name.to_owned(),
                is_type_only: false,
                line,
                col: 0,
                span_start: 0,
                is_re_export: false,
                deprecated: false,
                deprecated_reason: None,
            })
        }

        fn dependency(manifest: PathBuf, line: u32) -> UnusedDependencyFinding {
            UnusedDependencyFinding::with_actions(UnusedDependency {
                package_name: "left-pad".to_owned(),
                location: DependencyLocation::Dependencies,
                path: manifest,
                line,
                used_in_workspaces: Vec::new(),
            })
        }

        /// Findings of the kinds whose old fingerprint held a line, with
        /// every line moved down by `shift`.
        fn results(root: &Path, shift: u32) -> AnalysisResults {
            let mut results = AnalysisResults::default();
            results
                .unused_exports
                .push(export(root, "first", 3 + shift));
            results
                .unused_exports
                .push(export(root, "second", 9 + shift));
            results
                .unused_dependencies
                .push(dependency(root.join("package.json"), 5 + shift));
            results
                .unlisted_dependencies
                .push(UnlistedDependencyFinding::with_actions(
                    UnlistedDependency {
                        package_name: "chalk".to_owned(),
                        imported_from: vec![
                            ImportSite {
                                path: root.join("src/cli.ts"),
                                line: 2 + shift,
                                col: 0,
                            },
                            ImportSite {
                                path: root.join("src/cli.ts"),
                                line: 8 + shift,
                                col: 0,
                            },
                        ],
                    },
                ));
            results
                .duplicate_exports
                .push(DuplicateExportFinding::with_actions(DuplicateExport {
                    export_name: "Config".to_owned(),
                    locations: vec![
                        DuplicateLocation {
                            path: root.join("src/a.ts"),
                            line: 4 + shift,
                            col: 0,
                        },
                        DuplicateLocation {
                            path: root.join("src/b.ts"),
                            line: 6 + shift,
                            col: 0,
                        },
                    ],
                }));
            stamp_dead_code_finding_ids(&mut results, root);
            results
        }

        fn fingerprints(issues: &[CodeClimateIssue]) -> Vec<String> {
            issues
                .iter()
                .map(|issue| issue.fingerprint.clone())
                .collect()
        }

        /// A line shift above a finding keeps its fingerprint, so GitLab and
        /// the review layer keep the same issue and the same thread.
        #[test]
        fn a_line_shift_keeps_every_dead_code_fingerprint() {
            let root = PathBuf::from("/project");
            let rules = RulesConfig::default();

            let before = build_codeclimate(&results(&root, 0), &root, &rules);
            let after = build_codeclimate(&results(&root, 40), &root, &rules);

            assert_eq!(before.len(), 7);
            assert_eq!(fingerprints(&before), fingerprints(&after));
            assert_ne!(
                before[0].location.lines.begin, after[0].location.lines.begin,
                "the guard is only meaningful while the lines actually moved"
            );
            let mut unique = fingerprints(&before);
            unique.sort();
            unique.dedup();
            assert_eq!(
                unique.len(),
                before.len(),
                "every issue keeps its own fingerprint"
            );
            assert_eq!(
                before[0].legacy_fingerprint.as_deref(),
                Some(
                    codeclimate_fingerprint_hash(&[
                        "fallow/unused-export",
                        "src/lib.ts",
                        "3",
                        "first"
                    ])
                    .as_str()
                ),
                "the line-based value stays available to match older review threads"
            );
        }

        fn site(root: &Path, file: &str, line: u32) -> ImportSite {
            ImportSite {
                path: root.join(file),
                line,
                col: 0,
            }
        }

        fn location(root: &Path, file: &str, line: u32) -> DuplicateLocation {
            DuplicateLocation {
                path: root.join(file),
                line,
                col: 0,
            }
        }

        /// Fingerprint per location path for one unlisted dependency and one
        /// duplicate export with the given locations.
        fn per_location(
            root: &Path,
            sites: Vec<ImportSite>,
            locations: Vec<DuplicateLocation>,
        ) -> Vec<(String, u32, String)> {
            let mut results = AnalysisResults::default();
            results
                .unlisted_dependencies
                .push(UnlistedDependencyFinding::with_actions(
                    UnlistedDependency {
                        package_name: "chalk".to_owned(),
                        imported_from: sites,
                    },
                ));
            results
                .duplicate_exports
                .push(DuplicateExportFinding::with_actions(DuplicateExport {
                    export_name: "Config".to_owned(),
                    locations,
                }));
            stamp_dead_code_finding_ids(&mut results, root);
            build_codeclimate(&results, root, &RulesConfig::default())
                .into_iter()
                .map(|issue| {
                    (
                        format!("{} {}", issue.check_name, issue.location.path),
                        issue.location.lines.begin,
                        issue.fingerprint,
                    )
                })
                .collect()
        }

        fn fingerprint_at(issues: &[(String, u32, String)], path: &str, line: u32) -> String {
            issues
                .iter()
                .find(|(p, l, _)| p == path && *l == line)
                .map_or_else(
                    || panic!("no issue at {path}:{line}: {issues:?}"),
                    |(_, _, fingerprint)| fingerprint.clone(),
                )
        }

        /// A location is named by its content, not by its position among the
        /// other locations. Adding or removing a sibling location, in another
        /// file or later in the same file, keeps the fingerprints of the
        /// others.
        #[test]
        fn a_sibling_location_does_not_move_the_other_fingerprints() {
            let root = PathBuf::from("/project");
            let base = per_location(
                &root,
                vec![site(&root, "src/b.ts", 4), site(&root, "src/c.ts", 7)],
                vec![
                    location(&root, "src/b.ts", 4),
                    location(&root, "src/c.ts", 7),
                ],
            );
            let added = per_location(
                &root,
                vec![
                    site(&root, "src/a.ts", 1),
                    site(&root, "src/b.ts", 4),
                    site(&root, "src/b.ts", 9),
                    site(&root, "src/c.ts", 7),
                ],
                vec![
                    location(&root, "src/a.ts", 1),
                    location(&root, "src/b.ts", 4),
                    location(&root, "src/b.ts", 9),
                    location(&root, "src/c.ts", 7),
                ],
            );
            let removed = per_location(
                &root,
                vec![site(&root, "src/c.ts", 7)],
                vec![
                    location(&root, "src/c.ts", 7),
                    location(&root, "src/d.ts", 2),
                ],
            );

            for rule in ["fallow/unlisted-dependency", "fallow/duplicate-export"] {
                let pick = |issues: &[(String, u32, String)]| {
                    issues
                        .iter()
                        .filter_map(|(key, line, fingerprint)| {
                            key.strip_prefix(&format!("{rule} "))
                                .map(|path| (path.to_owned(), *line, fingerprint.clone()))
                        })
                        .collect::<Vec<_>>()
                };
                let (base, added, removed) = (pick(&base), pick(&added), pick(&removed));
                assert_eq!(
                    fingerprint_at(&base, "src/b.ts", 4),
                    fingerprint_at(&added, "src/b.ts", 4)
                );
                assert_eq!(
                    fingerprint_at(&base, "src/c.ts", 7),
                    fingerprint_at(&added, "src/c.ts", 7)
                );
                assert_eq!(
                    fingerprint_at(&base, "src/c.ts", 7),
                    fingerprint_at(&removed, "src/c.ts", 7)
                );
                assert_ne!(
                    fingerprint_at(&added, "src/b.ts", 4),
                    fingerprint_at(&added, "src/b.ts", 9),
                    "two locations with the same content still get two fingerprints"
                );
            }
        }

        /// The same package unused in two workspaces is two findings. The old
        /// fingerprint held only rule and package name, so they collided.
        #[test]
        fn the_same_dependency_in_two_workspaces_gets_two_fingerprints() {
            let root = PathBuf::from("/project");
            let mut results = AnalysisResults::default();
            results
                .unused_dependencies
                .push(dependency(root.join("packages/a/package.json"), 5));
            results
                .unused_dependencies
                .push(dependency(root.join("packages/b/package.json"), 5));
            stamp_dead_code_finding_ids(&mut results, &root);

            let issues = build_codeclimate(&results, &root, &RulesConfig::default());

            assert_eq!(issues.len(), 2);
            assert_ne!(issues[0].fingerprint, issues[1].fingerprint);
        }

        /// A saved report from before finding ids has no ids. It keeps the old
        /// line-based fingerprint, so its threads stay matched.
        #[test]
        fn a_finding_without_an_id_keeps_the_legacy_fingerprint() {
            let root = PathBuf::from("/project");
            let mut results = AnalysisResults::default();
            results.unused_exports.push(export(&root, "first", 3));

            let issues = build_codeclimate(&results, &root, &RulesConfig::default());

            assert_eq!(
                issues[0].fingerprint,
                codeclimate_fingerprint_hash(&["fallow/unused-export", "src/lib.ts", "3", "first"])
            );
        }
    }
}