fallow_config/config/

mod.rs

mod boundaries;
mod dependency_ignore;
mod duplicates_config;
mod entry_span;
mod finding_ignore;
mod flags;
mod format;
pub mod glob_validation;
mod health;
mod ignore_patterns;
mod parsing;
mod resolution;
mod resolve;
mod rules;
mod similar_code;
mod used_class_members;

#[expect(
    clippy::redundant_pub_crate,
    reason = "this module is glob re-exported from lib.rs, so `pub` would leak the helper into the public API; pub(crate) keeps it internal to the crate"
)]
pub(crate) use boundaries::wildcard_placement_error;
pub use boundaries::{
    AuthoredRule, BoundaryCallsConfig, BoundaryConfig, BoundaryCoverageConfig, BoundaryPreset,
    BoundaryRule, BoundaryZone, ForbiddenCallRule, ForbiddenCallee, InvalidForbiddenCallee,
    LogicalGroup, LogicalGroupStatus, RedundantRootPrefix, ResolvedBoundaryConfig,
    ResolvedBoundaryCoverageConfig, ResolvedBoundaryRule, ResolvedZone, UnknownZoneRef,
    ZoneReferenceKind, ZoneValidationError,
};
pub use dependency_ignore::{IgnoreDependencyMatcher, is_dependency_glob};
pub use duplicates_config::{
    DetectionMode, DuplicatesConfig, NormalizationConfig, ResolvedNormalization,
};
pub use entry_span::ConfigEntrySpan;
pub use finding_ignore::FindingIgnoreMatcher;
pub use flags::{FlagsConfig, SdkPattern};
pub use format::OutputFormat;
pub use health::{EmailMode, HealthConfig, HealthThresholdOverride, OwnershipConfig};
pub use ignore_patterns::{IgnorePatternSet, UNLIFTABLE_IGNORE_SEGMENTS};
pub use parsing::{CONFIG_FILE_NAMES, ConfigLoadOptions};
pub use resolution::{
    AnalysisSnapshot, CACHE_DIR_ENV, CACHE_MAX_SIZE_ENV, CompiledIgnoreCatalogReferenceRule,
    CompiledIgnoreDependencyOverrideRule, CompiledIgnoreExportRule, ConfigOverride,
    DEFAULT_IGNORE_PATTERNS, DEFAULT_MAX_FILE_SIZE_BYTES, DEFAULT_MAX_FILE_SIZE_MB,
    IgnoreCatalogReferenceRule, IgnoreDependencyOverrideRule, IgnoreExportRule,
    PACKAGE_BASELINES_ENV, ResolvedConfig, ResolvedOverride, cache_config_hash,
    cache_dir_env_override, cache_dir_from_env_value, cache_max_size_env_override,
    cache_max_size_from_env_value, package_baselines_disabled_by_env_value,
    resolve_max_file_size_bytes,
};
pub use resolve::ResolveConfig;
pub use rules::{
    KNOWN_RULE_NAMES, PartialRulesConfig, RulesConfig, Severity, closest_known_rule_name,
    default_severity_for_kind, is_opt_in_kind,
};
pub use similar_code::SimilarCodeConfig;
pub use used_class_members::{ScopedUsedClassMemberRule, UsedClassMemberRule};

use schemars::JsonSchema;
use serde::{Deserialize, Deserializer, Serialize};
use std::ops::Not;
use std::path::PathBuf;

use crate::external_plugin::ExternalPluginDef;
use crate::workspace::WorkspaceConfig;

/// Value of the `ignoreExportsUsedInFile` config key: whether an export
/// referenced elsewhere in its own file is suppressed from `unused-export`.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(untagged, rename_all = "camelCase")]
pub enum IgnoreExportsUsedInFileConfig {
    /// Blanket toggle: `true` suppresses any export with a same-file use,
    /// regardless of kind. The default is `false`.
    Bool(bool),
    /// Knip-parity object form restricting the suppression to type-only
    /// exports.
    ByKind(IgnoreExportsUsedInFileByKind),
}

impl Default for IgnoreExportsUsedInFileConfig {
    fn default() -> Self {
        Self::Bool(false)
    }
}

impl From<bool> for IgnoreExportsUsedInFileConfig {
    fn from(value: bool) -> Self {
        Self::Bool(value)
    }
}

impl From<IgnoreExportsUsedInFileByKind> for IgnoreExportsUsedInFileConfig {
    fn from(value: IgnoreExportsUsedInFileByKind) -> Self {
        Self::ByKind(value)
    }
}

impl IgnoreExportsUsedInFileConfig {
    /// Whether any form of the same-file-use suppression is active (the bool
    /// form is `true`, or either by-kind field is set).
    #[must_use]
    pub const fn is_enabled(self) -> bool {
        match self {
            Self::Bool(value) => value,
            Self::ByKind(kind) => kind.type_ || kind.interface,
        }
    }

    /// Whether an export with a same-file use should be suppressed, given
    /// whether fallow classified it as type-only. The bool form suppresses
    /// regardless of kind; the by-kind form suppresses type-only exports only.
    #[must_use]
    pub const fn suppresses(self, is_type_only: bool) -> bool {
        match self {
            Self::Bool(value) => value,
            Self::ByKind(kind) => is_type_only && (kind.type_ || kind.interface),
        }
    }
}

/// Object form of `ignoreExportsUsedInFile` (`{ "type": ..., "interface": ... }`),
/// restricting the same-file-use suppression to type-only exports.
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct IgnoreExportsUsedInFileByKind {
    /// When `true`, enables the same-file-use suppression for type-only exports (serialized as `type`; part of the object form of `ignoreExportsUsedInFile`). Because fallow groups type aliases and interfaces under one issue kind, setting either `type` or `interface` enables the identical type-only suppression, applied only to exports fallow classifies as type-only.
    #[serde(default, rename = "type")]
    pub type_: bool,
    /// When `true`, enables the same-file-use suppression for type-only exports (part of the object form of `ignoreExportsUsedInFile`). Fallow does not distinguish interfaces from type aliases in this issue kind, so `interface` behaves identically to `type`: setting either one turns on the type-only same-file suppression.
    #[serde(default)]
    pub interface: bool,
}

/// Options for the `unused-component-props` rule.
///
/// Lets a project exempt component props whose local destructure binding name
/// matches a regex from `unused-component-props`, honoring the
/// "accepted-but-intentionally-unused" leading-underscore convention (Svelte 5
/// `$props()`, React destructure) that mirrors TypeScript `noUnusedParameters`
/// and ESLint `@typescript-eslint/no-unused-vars` `varsIgnorePattern` /
/// `argsIgnorePattern`. Opt-in; an unset `ignorePattern` leaves the rule's
/// behavior unchanged.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(default, deny_unknown_fields, rename_all = "camelCase")]
pub struct UnusedComponentPropsConfig {
    /// Regex matched against each declared prop's LOCAL destructure binding name
    /// (e.g. `_stage` in `let { stage: _stage } = $props()`), which falls back
    /// to the public prop name when there is no alias. A prop whose local name
    /// matches is treated as intentionally unused and never reported as
    /// `unused-component-props`. Matching is unanchored (substring), like
    /// ESLint's `RegExp.test`, so anchor with `^_` to match a leading
    /// underscore. Compiled and validated at config load (an invalid regex fails
    /// load). Applies to Vue, Svelte, Astro, and React/Preact props.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub ignore_pattern: Option<String>,
}

impl UnusedComponentPropsConfig {
    /// True when no option is set, so serialization can omit the section.
    #[must_use]
    pub fn is_default(&self) -> bool {
        self.ignore_pattern.is_none()
    }
}

/// Options for the `circular-dependencies` rule.
///
/// The default leaves the rule unchanged: every runtime import edge takes
/// part in cycle detection, and only type-only edges are skipped.
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(default, deny_unknown_fields, rename_all = "camelCase")]
pub struct CircularDependenciesConfig {
    /// Skip import edges that load their target on demand or on another
    /// thread when fallow looks for cycles. A literal `import()` inside a
    /// function, a template `import()`, a lazy `import.meta.glob`, a worker
    /// URL and a webpack worker loader request (`worker-loader!./work.js`)
    /// are lazy edges. A top-level `await import()`, `require()` and an
    /// eager `import.meta.glob` load before the module finishes, so they stay.
    /// An edge that also carries a static import stays. Default `false`.
    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
    pub ignore_lazy_imports: bool,
}

impl CircularDependenciesConfig {
    /// True when no option is set, so serialization can omit the section.
    #[must_use]
    pub const fn is_default(&self) -> bool {
        !self.ignore_lazy_imports
    }
}

/// The `fix` config section: settings for `fallow fix` apply behavior.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct FixConfig {
    /// Groups `fallow fix` settings for pnpm workspace catalog cleanup. Its only key, `deletePrecedingComments` (`auto` default, `always`, `never`), controls whether a comment block directly above a removed unused `pnpm-workspace.yaml` catalog entry is deleted with the entry.
    #[serde(default)]
    pub catalog: CatalogFixConfig,
}

/// The `fix.catalog` section: how `fallow fix` cleans up unused
/// `pnpm-workspace.yaml` catalog entries.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct CatalogFixConfig {
    /// Controls whether comment lines immediately above an unused `pnpm-workspace.yaml` catalog entry are removed when `fallow fix` deletes that entry: `auto` (default: delete only when the comment block is preceded by a blank line or sits directly under the parent catalog header, and never when it is a section banner like `# ====`), `always` (always remove the adjacent comment block), or `never` (leave all preceding comments). A `fallow-keep` marker anywhere in the block always preserves it regardless of this setting. Set `never` for teams that keep hand-authored notes above catalog pins.
    #[serde(default)]
    pub delete_preceding_comments: CatalogPrecedingCommentPolicy,
}

/// Value of `fix.catalog.deletePrecedingComments`: what happens to comment
/// lines directly above a catalog entry that `fallow fix` removes. A
/// `fallow-keep` marker in the block always preserves it regardless of policy.
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "lowercase")]
pub enum CatalogPrecedingCommentPolicy {
    /// Delete the adjacent comment block only when heuristics attribute it to
    /// the entry (preceded by a blank line or directly under the catalog
    /// header) and it is not a section banner. The default.
    #[default]
    Auto,
    /// Always delete the adjacent comment block with the entry.
    Always,
    /// Never delete preceding comments.
    Never,
}

/// Completeness policy for opt-in TypeScript semantic analysis.
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "kebab-case")]
pub enum TypeAwareRequire {
    /// Keep conservative findings and report semantic gaps without failing.
    #[default]
    BestEffort,
    /// Fail the quality gate when any requested semantic query is incomplete.
    Complete,
}

impl From<TypeAwareRequire> for fallow_types::semantic::SemanticCompletenessRequirement {
    fn from(value: TypeAwareRequire) -> Self {
        match value {
            TypeAwareRequire::BestEffort => Self::BestEffort,
            TypeAwareRequire::Complete => Self::Complete,
        }
    }
}

/// Shared opt-in configuration for TypeScript semantic analysis.
#[derive(Debug, Default, Clone, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
pub struct TypeAwareConfig {
    /// Enable the optional TypeScript semantic pass. Disabled by default.
    #[serde(default)]
    pub enabled: bool,
    /// TypeScript project config paths, resolved relative to the project root.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub projects: Vec<String>,
    /// Decide whether partial semantic analysis is advisory or gating.
    #[serde(default, skip_serializing_if = "is_default_type_aware_require")]
    pub require: TypeAwareRequire,
}

#[expect(
    clippy::trivially_copy_pass_by_ref,
    reason = "serde skip_serializing_if callbacks receive field values by reference"
)]
fn is_default_type_aware_require(value: &TypeAwareRequire) -> bool {
    matches!(value, TypeAwareRequire::BestEffort)
}

impl TypeAwareConfig {
    /// True when the section equals its default (disabled, no projects,
    /// best-effort), so serialization can omit it.
    #[must_use]
    pub fn is_default(&self) -> bool {
        !self.enabled && self.projects.is_empty() && self.require == TypeAwareRequire::BestEffort
    }
}

/// The user-facing fallow configuration as authored in `.fallowrc.json` /
/// `.fallowrc.jsonc` / `fallow.toml` / `.fallow.toml`.
///
/// Every field documents its serialized meaning, default, and precedence
/// against CLI flags and environment variables where they exist.
/// `FallowConfig::resolve` compiles the loaded config (globs, regexes,
/// plugin and rule-pack discovery) into a [`ResolvedConfig`] for analysis.
/// Unknown keys are rejected at load so typos fail loud.
#[derive(Debug, Default, Deserialize, Serialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
// Both `.fallowrc.json` and `.fallowrc.jsonc` are read with the JSONC dialect
// from `crate::jsonc::parse_options`, so the schema declares the same dialect.
// JSON language service clients (VS Code, Zed) read these two keywords off the
// root object and otherwise flag syntax the loader accepts. They are
// annotations only: nothing in fallow reads them back.
#[schemars(extend("allowComments" = true, "allowTrailingCommas" = true))]
pub struct FallowConfig {
    /// A string pointing at fallow's JSON Schema URL, used only by editors for autocomplete and validation of the config file; it has no effect on analysis and is stripped before serialization (serde skip_serializing, writeOnly in the schema). Set it to `./node_modules/fallow/schema.json` for npm installs (version-aligned, offline, avoids VS Code's untrusted-remote-schema prompt), or `https://raw.githubusercontent.com/fallow-rs/fallow/main/schema.json` for non-npm installs; any other value is ignored by fallow.
    #[serde(rename = "$schema", default, skip_serializing)]
    pub schema: Option<String>,

    /// The lowest fallow version this config is written for, as `MAJOR.MINOR.PATCH`. An older binary stops with a message naming both versions instead of failing on the first field it does not recognize, so a config committed to a shared repository says which upgrade it needs rather than reading like a typo. Optional and unset by default; set it in the same change that adds a field introduced in a newer version. It gates nothing on its own: an unknown key still fails on a binary at or above this version, because there the key really is a typo.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub minimum_version: Option<String>,

    /// An ordered array of parent config sources to inherit before this file's own keys apply; each entry is a file-relative path, an `npm:<package>` specifier, or an `https://` URL (`http://` is rejected), deep-merged in order so objects merge field-by-field while arrays and scalars in this file replace the parent's, with cycle and depth guards. Set it to share a base config across a monorepo or team; it is consumed at load and stripped before serialization (serde skip_serializing).
    #[serde(default, skip_serializing)]
    pub extends: Vec<String>,

    /// An array of project-root-relative glob patterns whose matching files are seeded as manual entry points, on top of the framework and package.json entries fallow discovers automatically, so their transitive imports are not reported as unused. Set it (e.g. `["src/main.ts"]`) when a file is a real runtime root that no plugin or manifest declares; patterns are validated at load and matched against discovered files.
    #[serde(default)]
    pub entry: Vec<String>,

    /// An array of project-root-relative glob patterns for files to exclude from analysis entirely; entries are unioned with fallow's built-in defaults (**/node_modules/**, **/dist/**, **/build/**, **/.git/**, **/coverage/**, **/*.min.js, **/*.min.mjs, **/*.min.cjs, **/*.bundle.js), so custom globs add to rather than replace them. Set it (e.g. `["generated/**"]`) to drop generated or vendored trees from every detector; patterns are validated at load. A `!`-prefixed entry is an exception that applies after the defaults and the positive patterns: `"!src/policy/coverage/**"` brings back hand-written source under a built-in default such as `**/coverage/**`, and `"!.config/**"` adds a hidden directory to discovery. Paths under `node_modules` or `.git` can not be lifted, and a `!` entry that names one of these segments is a config error.
    #[serde(default)]
    pub ignore_patterns: Vec<String>,

    /// An array of project-root-relative glob patterns whose source-owned dead-code findings are hidden after analysis without excluding matching files from discovery, parsing, resolution, or the module graph. Use `/` as the path separator on every platform. Positive patterns select paths to hide; `!`-prefixed patterns keep matching paths reportable, and a negated-only array reports only those exception paths. A finding with multiple source owners is hidden only when every owner matches, so a cycle, duplicate-export group, or unlisted dependency with any reportable location remains visible. Architecture, policy, suppression-hygiene, and framework-correctness findings remain visible even when a referenced path matches, as do manifest-owned findings that no source file owns: unused dependencies, unused dev and optional dependencies, catalog entries, and dependency overrides. Use `ignorePatterns` instead when a generated or vendored file must not be analyzed at all.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub ignore_findings: Vec<String>,

    /// Declares inline external framework plugins as data (array of plugin objects), each with `name` plus optional `enablers` (package names that activate it) or richer `detection` (dependency/file-existence/`all`/`any` checks, taking priority over `enablers`), `entryPoints` (+ `entryPointRole` runtime/support/test), `configPatterns`, `alwaysUsed`, `toolingDependencies`, `usedExports` (`{ pattern, exports }`), and `usedClassMembers`. Set it to keep a custom or in-house framework's entry points, config files, and conventions reachable without a Rust plugin; these definitions are appended to plugins discovered via `plugins`, `.fallow/plugins/`, and root `fallow-plugin-*` files (first occurrence of a name wins), and cannot do AST-based config parsing.
    #[serde(default)]
    pub framework: Vec<ExternalPluginDef>,

    /// Monorepo workspace configuration. `patterns` adds workspace package roots beyond manifest discovery; `changedSince` maps exact project-root-relative workspace roots to Git baseline refs. A global changed-since request overrides those per-package baselines.
    #[serde(default)]
    pub workspaces: Option<WorkspaceConfig>,

    /// A list of package names or package-name globs excluded from BOTH unused-dependency and unlisted-dependency detection, so a runtime-provided or otherwise-untracked package (e.g. `bun:sqlite`, a peer supplied at deploy time) is never flagged as unused when declared nor as unlisted when imported. Set it for packages fallow cannot observe being used and cannot observe being declared. An entry without glob characters matches the package name exactly; an entry with `*`, `?`, `[` or `{` is a glob in the `ignorePatterns` syntax matched against the package name, so `@acme/*` covers every package in the `@acme` scope.
    #[serde(default)]
    pub ignore_dependencies: Vec<String>,

    /// A list of command names whose file arguments fallow does not make entry points. Fallow reads commands in package.json scripts (root and workspace packages), CI files (GitHub Actions and GitLab CI), Dockerfiles, Procfiles, and fly.toml files, and a file that a command names (such as `node scripts/seed.ts`) normally becomes an entry point. A listed command still counts as a used dependency, and its `--config` file is still tracked. Formatters and linters (ESLint, Prettier, Oxlint, Oxfmt, Biome, Stylelint, and similar tools) never make their targets entry points, so they do not need to be listed. Set it for a command whose file arguments are data, not code that runs (e.g. `["my-codegen"]`), or use `["*"]` to turn off entry points from all commands and declare real entries in `entry`. A name matches the command after environment, package-manager, and wrapper prefixes (`npx`, `pnpm exec`, `yarn run`, `varlock run --`), by exact file name; `*` is the only wildcard.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub ignore_command_entries: Vec<String>,

    /// A list of glob patterns that suppress only `unresolved-import` findings whose raw import specifier matches; it does not change dependency usage accounting or resolver behavior. Patterns match the import string as written (not a filesystem path), so list both `@example/icons` and `@example/icons/**` to cover a bare package and its subpaths; parent-relative generated specifiers like `../generated/**` are valid, and broad values like `**` can hide real missing modules.
    #[serde(default)]
    pub ignore_unresolved_imports: Vec<String>,

    /// A list of per-file rules that exempt named exports from `unused-export` and from duplicate-exports grouping for files matching a glob. Each entry is `{ file: <glob>, exports: [<name>, ...] }` where `exports: ["*"]` exempts every export in the file and a name list exempts only those names; built for component-library barrels (shadcn/Radix/bits-ui `index.ts`) that intentionally re-export the same short names across many files.
    #[serde(default)]
    pub ignore_exports: Vec<IgnoreExportRule>,

    /// A list of rules that suppress `unresolved-catalog-reference` findings (a workspace `package.json` referencing a `catalog:` or `catalog:<name>` that the catalog does not declare); config-only because `package.json` has no inline-suppression comment surface. Each entry needs a `package` (exact match) plus optional `catalog` (exact catalog-name match) and `consumer` (glob on the consuming package.json path); use it for staged catalog migrations where the catalog edit lands in a separate change.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub ignore_catalog_references: Vec<IgnoreCatalogReferenceRule>,

    /// A list of rules that suppress `unused-dependency-override` and `misconfigured-dependency-override` findings for pnpm `overrides` entries; config-only, matched against the override's target package. Each entry needs a `package` (exact match) plus an optional `source` to scope the suppression to `"pnpm-workspace.yaml"` or `"package.json"`.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub ignore_dependency_overrides: Vec<IgnoreDependencyOverrideRule>,

    /// Controls whether an export referenced only by another symbol in the same file is treated as used (suppressed from `unused-export`) until it becomes completely unreferenced; references inside an export specifier itself (`export { foo }`, `export default foo`) do not count as same-file uses. Accepts `true`/`false` (default `false`, suppress nothing) or the knip-parity object `{ "type": true, "interface": true }`, which restricts the suppression to type-only exports; fallow groups type aliases and interfaces under one kind, so both object fields behave identically.
    #[serde(default)]
    pub ignore_exports_used_in_file: IgnoreExportsUsedInFileConfig,

    /// A list of decorator names that no longer grant a class member automatic exemption from `unused-class-member`: a member whose every decorator is in this set is checked normally, while a member carrying any decorator NOT listed here stays skipped (frameworks consume decorated members reflectively). Dotted entries match the full decorator path (`ns.foo`) and bare entries match the leftmost segment (so `"decorators"` collapses every `@decorators.*`); both `"@step"` and `"step"` are accepted (leading `@` stripped), and an unmatched entry emits a one-time warning.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub ignore_decorators: Vec<String>,

    /// A list of class-member names or glob patterns treated as framework-used, so a method a library invokes reflectively (ag-Grid `agInit`/`refresh`, Web Component `connectedCallback`) is not reported as `unused-class-member`; it applies to class members only, not enum members. Each entry is either a plain string/glob (`"agInit"`, `"enter*"`, `"*"`) applied to every class, or a scoped object `{ extends?, implements?, members: [...] }` that applies only when the class matches that heritage clause (a scoped rule requires `extends` or `implements`); patterns matching zero members warn once.
    #[serde(default)]
    pub used_class_members: Vec<UsedClassMemberRule>,

    /// Configures clone detection: `enabled` (default true), `mode` (`strict`, `mild` default, `weak`, `semantic`, from least to most identifier/literal blinding; `strict` and `mild` are equivalent under fallow's AST tokenizer, `weak` blinds string literals, `semantic` blinds all identifiers and literals for Type-2 renamed-variable detection), `near` (false, add bounded function-scoped near-miss detection), `minTokens` (50), `minLines` (5), `minOccurrences` (integer >= 2, deserialization fails below 2), `threshold` (max duplication percentage, 0 = no limit), `ignore` globs, `ignoredClones` (reviewed clone keys to hide until their content or occurrence count changes), `ignoreDefaults` (true, merge built-in generated-file ignores), `skipLocal` (only report cross-directory clones), `ignoreSymlinks` (false, omit clone instances whose path is a symlink or lies under a symlinked directory), `crossLanguage` (strip TS type annotations to match .ts against .js), `ignoreImports` (true, strip ES import/re-export/top-level require wiring from the token stream), and `normalization` (per-flag `ignoreIdentifiers`/`ignoreStringValues`/`ignoreNumericValues` overrides on top of `mode`). Raise `minOccurrences` to focus on widespread copy-paste, enable `near` for gapped structural clones, or set `mode` to `semantic` to catch renamed-variable exact clones.
    #[serde(default)]
    pub duplicates: DuplicatesConfig,

    /// Configures the explicit local `similar-code` candidate workflow:
    /// `threshold` (0.80, model-specific cosine floor), `minLines` (3), and
    /// additional `ignore` globs. Provider identity, setup, executables,
    /// endpoints, credentials, and consent cannot be set by project config.
    #[serde(default)]
    pub similar_code: SimilarCodeConfig,

    /// Sets complexity and health thresholds for `fallow health` (also applied in combined `fallow` and `fallow audit`): `maxCyclomatic` (20), `maxCognitive` (15), `maxCrap` (30.0, findings at or above this are reported), `crapRefactorBand` (5, cyclomatic band below `maxCyclomatic` where a secondary refactor action is added), `maxUnitSize` (max function lines before a large-function finding, 60), `coverage`/`coverageRoot` (Istanbul coverage path and path-prefix strip for accurate CRAP), `ignore` globs (remove files from findings AND the health score), `thresholdOverrides` (per-file/per-function ceilings via `files`/`functions`/`maxCyclomatic`/`maxCognitive`/`maxCrap`/`maxUnitSize`/`reason`), `ownership` (`botPatterns` and `emailMode` for `--ownership`), and `suggestInlineSuppression` (true, emit `suppress-line` action hints in JSON). Raise thresholds to relax which functions are flagged, wire `coverage` for real CRAP scores, or exempt generated/test files via `ignore` (drops them from the score too) or `thresholdOverrides` (keeps them visible under a higher ceiling). The four `max*` thresholds govern findings only and never move `health_score`: its penalties use fixed calibration so grades stay comparable across projects, and `ignore` is the lever that removes files from the score.
    #[serde(default)]
    pub health: HealthConfig,

    /// Opts into TypeScript semantic analysis for project-wide symbol use,
    /// provenance, API surface, symbol impact, and public-signature coupling.
    /// This does not surface compiler diagnostics or typed lint rules.
    #[serde(default, skip_serializing_if = "TypeAwareConfig::is_default")]
    pub type_aware: TypeAwareConfig,

    /// Sets per-issue-type severity, keyed by kebab-case rule id: `error` reports and fails CI (non-zero exit), `warn` reports without failing, `off` disables detection and reporting entirely (e.g. `{ "unused-files": "error", "unused-exports": "warn", "private-type-leaks": "off" }`). Set a rule `off` to silence it, `warn` to demote below CI gating, or `error` to promote a warn/off-default rule to gating; most rules default to `error`, dev/optional-dependency and component/store/inject/CSS/catalog rules default to `warn`, and opt-in rules (`private-type-leaks`, `deprecated-exports-in-use`, `security-*`, `prop-drilling`, `thin-wrapper`, `duplicate-prop-shape`, `coverage-gaps`, `feature-flags`, `require-suppression-reason`) default to `off`. Singular aliases (`unused-file`) and `warning`/`none` severity spellings are accepted.
    #[serde(default)]
    pub rules: RulesConfig,

    #[serde(
        default,
        skip_serializing_if = "UnusedComponentPropsConfig::is_default"
    )]
    /// Options for the `unused-component-props` rule, currently only `ignorePattern`: a regex matched against each declared prop's local destructure binding name (falling back to the public prop name when unaliased) to exempt intentionally-unused props such as the leading-underscore convention. Set `{ "ignorePattern": "^_" }` to skip props like `_stage`; matching is unanchored (substring, like ESLint's `RegExp.test`) so anchor with `^`, the pattern is validated at config load (invalid regex fails load), and it applies to Vue, Svelte, Astro, and React/Preact props (unset leaves the rule unchanged).
    pub unused_component_props: UnusedComponentPropsConfig,

    #[serde(
        default,
        skip_serializing_if = "CircularDependenciesConfig::is_default"
    )]
    /// Options for the `circular-dependencies` rule, currently only `ignoreLazyImports`. Set `{ "ignoreLazyImports": true }` to skip import edges that load on demand or on another thread (an `import()` inside a function, a template `import()`, a lazy `import.meta.glob`, a worker URL, a webpack worker loader request such as `worker-loader!./work.js`) when fallow looks for cycles. A top-level `await import()`, `require()`, an eager glob, and an edge that also has a static import stay in the cycle graph. Default `false` leaves the rule unchanged.
    pub circular_dependencies: CircularDependenciesConfig,

    /// Configures architecture boundary enforcement: which source directories belong to which named zone and which zones may import which others, reported as boundary-violation, boundary-coverage-violation, and boundary-call-violation findings (severity via rules.boundary-violation, default error). Set to enforce a layered/module architecture; the object holds `preset` (one of layered, hexagonal, feature-sliced, bulletproof, whose default zones/rules are merged in with the user-declared zones/rules taking precedence), `zones` (each with `name`, `patterns`, `autoDiscover`, optional `root`), `rules` (each with `from`, `allow`, `allowTypeOnly` target-zone lists), `coverage` (`requireAllFiles` plus `allowUnmatched` globs for files matching no zone), and `calls` (a `forbidden` list of `{from, callee}` banned-call rules per zone).
    #[serde(default)]
    pub boundaries: BoundaryConfig,

    /// Configures feature-flag detection: `sdkPatterns` (custom flag-evaluating call signatures, each `{ function, nameArg (zero-based arg index of the flag name, default 0), provider? }`, merged with built-ins for LaunchDarkly, Statsig, Unleash, GrowthBook, Split, PostHog, Vercel Flags, ConfigCat, Flagsmith, Optimizely, and Eppo), `envPrefixes` (env-var prefixes marking `process.env.*` and `import.meta.env.*` accesses as flags, merged with built-ins), and `configObjectHeuristics` (default false; when true, property accesses on objects whose name contains `feature`/`flag`/`toggle` are reported as low-confidence flags). Set `sdkPatterns`/`envPrefixes` to teach fallow a proprietary flag SDK or naming convention, or enable `configObjectHeuristics` for projects that read flags off config objects (higher false-positive rate). Feature-flag findings surface only when the `feature-flags` rule is enabled (default `off`).
    #[serde(default)]
    pub flags: FlagsConfig,

    /// Scopes the opt-in `fallow security` catalogue: which candidate categories run and which extra local identifiers count as HTTP request objects. Set when tuning security-candidate detection; the object holds `categories` (an object with `include` and/or `exclude` string arrays of catalogue category ids, where `include` restricts to a whitelist and `exclude` removes from the admitted set, both unset admits all ordinary categories) and `requestReceivers` (a string array of project-local names that extend, not replace, the built-in `*.query`/`*.params`/`*.body` source-receiver allowlist). The `hardcoded-secret` and `secret-to-network` categories are include-required: they fire only when explicitly listed in `categories.include`, even when no include list is otherwise set. The valid category ids are enumerated (with title, CWE, and include-required flag) in the `security_categories` block of `fallow schema`, and also listed by `fallow security --help`; they are not in this config-schema.
    #[serde(default)]
    pub security: SecurityConfig,

    /// Configures `fallow fix` behavior. Currently holds one nested section, `catalog` (a `CatalogFixConfig`), whose only key `deletePrecedingComments` (`auto` default, `always`, `never`) governs whether comment lines directly above a removed unused `pnpm-workspace.yaml` catalog entry are deleted with it.
    #[serde(default)]
    pub fix: FixConfig,

    /// Configures the module resolver. Its one key `conditions` is a list of additional package.json `exports`/`imports` condition names to honor, matched at higher priority than fallow's built-ins (`development`, `import`, `require`, `default`, `types`, `node`, plus `react-native`/`browser` when the React Native or Expo plugin is active). Set it when a package's `exports` map has custom branches (e.g. `worker`, `deno`, `edge`) that fallow should follow instead of the default branch.
    #[serde(default)]
    pub resolve: ResolveConfig,

    /// Enables production mode, which excludes test/spec/story/dev files from discovery and forces `unused-dev-dependencies` and `unused-optional-dependencies` to `off`. Accepts a boolean (default false) applied to all analyses, or a per-analysis object `{ deadCode?, health?, dupes? }` (each boolean, default false) that scopes production mode to individual analyses in combined `fallow` and `fallow audit`. Set it to analyze only shipped code; the `--production`/`--no-production` and `--production-{dead-code,health,dupes}` CLI flags and `FALLOW_PRODUCTION*` env vars override this value (CLI flags win, then per-analysis env, then global env, then config).
    #[serde(default)]
    pub production: ProductionConfig,

    /// List of paths (relative to the project root, must resolve within it) to external plugin definition files or directories in JSONC/JSON/TOML, loaded in addition to the auto-discovered `.fallow/plugins/` directory and root `fallow-plugin-*` files. Set it to load plugin definitions kept outside those default locations; a path resolving outside the project root is skipped with a `tracing::warn`, and paths listed here are searched before the auto-discovered locations (first occurrence of a plugin name wins).
    #[serde(default)]
    pub plugins: Vec<String>,

    /// Paths to declarative rule-pack files (JSON or JSONC), relative to the
    /// project root. Each pack declares `banned-call`, `banned-import`, or
    /// `banned-effect` rules that report as `policy-violation` findings. Packs
    /// are pure data: no project code is executed. Invalid or missing packs
    /// fail config load.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub rule_packs: Vec<String>,

    /// An array of project-root-relative glob patterns for files loaded at runtime by a mechanism the static graph cannot see (dynamic path resolution, config-driven loading); matching files are seeded as entry points so they and their imports stay reachable. Empty by default; set it (e.g. `["plugins/**/*.ts", "locales/**/*.json"]`) for plugin or locale trees pulled in dynamically.
    #[serde(default)]
    pub dynamically_loaded: Vec<String>,

    /// An ordered list of per-file rule-severity overrides: each entry re-severities specific analysis rules for files its globs match, layered on top of the top-level `rules` defaults. Set to relax or tighten rules for a subset of paths (e.g. downgrade unused-exports to warn under a generated directory); each entry has `files` (glob-pattern array) and `rules` (a partial per-rule severity map of error/warn/off). Entries apply in list order and a file matched by several entries takes every matching entry's overrides (later entries win on conflict); inter-file rules (duplicate-exports, circular-dependencies, re-export-cycle) have no effect in an override (fallow warns during analysis and points to the right mechanism: top-level `ignoreExports` for duplicate-exports, a file-level `// fallow-ignore-file` comment for the others).
    #[serde(default)]
    pub overrides: Vec<ConfigOverride>,

    /// A project-root-relative path to a CODEOWNERS file, used by fallow health --hotspots --ownership to attribute declared owners and compute unowned/drifting ownership state; setting it overrides the default probe order (CODEOWNERS, .github/CODEOWNERS, .gitlab/CODEOWNERS, docs/CODEOWNERS). String, defaults to null (auto-probe the standard locations); set it only when the CODEOWNERS file lives at a non-standard location.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub codeowners: Option<String>,

    /// An array of internal workspace package names (or globs matched against workspace package names) whose public API is intentionally consumed outside the analyzed graph; their entry points and re-export surface become reachability roots, so their exported files, exports, and class members are not reported as unused. Set it (e.g. `["@myorg/shared-lib", "@myorg/*"]`) for library packages in a monorepo that ship an API to external consumers; only meaningful when workspaces are present (an empty list or no workspaces is a no-op).
    #[serde(default)]
    pub public_packages: Vec<String>,

    /// Holds a saved issue-count baseline that the `--fail-on-regression` gate compares the current run against, failing only when counts grow beyond tolerance relative to the baseline. Usually written by `--save-baseline` rather than hand-authored; the object has a single `baseline` sub-key holding per-issue-type counts (total_issues plus per-kind fields like unused_exports, boundary_violations, policy_violations, each defaulting to 0). Absent means no baseline is embedded in config.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub regression: Option<RegressionConfig>,

    /// Sets in-repo defaults for `fallow audit` (the changed-files quality gate) so CLI flags need not repeat per run. Set to pin audit behavior; the object holds `gate` (`new-only` or `all`, which findings drive the verdict), `css`/`cssDeep` (booleans toggling styling analysis and the project-wide CSS reachability pass), `deadCodeBaseline`/`healthBaseline`/`dupesBaseline` (per-sub-analysis baseline file paths), and `cacheMaxAgeDays` (GC window in days for the reusable base-snapshot worktree cache). The matching CLI flag overrides each field.
    #[serde(default, skip_serializing_if = "AuditConfig::is_empty")]
    pub audit: AuditConfig,

    /// When true, restricts this config's extends entries to file-relative paths that resolve inside the config file's own directory; any https:// URL, npm: package, or relative path escaping that directory is rejected at load with a hard error. Boolean, defaults to false (URL, npm, and any-relative extends are permitted); set it to true to harden a config against pulling in remote or out-of-tree bases.
    #[serde(default)]
    pub sealed: bool,

    /// When true, exports of entry-point files are subject to unused-export detection instead of being auto-credited as used, so a typo'd or stray export in a framework route or package entry (e.g. meatdata for metadata) is flagged; plugin used_exports allowlists are still honored. Boolean, defaults to false; the CLI flag --include-entry-exports applies the same behavior for one run.
    #[serde(default)]
    pub include_entry_exports: bool,

    /// When true, the report keeps the unused exports, unused types, unused class members and unused enum members of a file that is an unused file. Boolean, defaults to false: deleting an unused file removes these findings, so the report hides them and counts them in cascade_hidden. The CLI flag --show-cascade applies the same behavior for one run.
    #[serde(default)]
    pub show_cascade: bool,

    /// When true, drops Nuxt convention-based entry-pattern fallbacks so genuinely-unreferenced convention files surface as unused-file. Component fallbacks are kept when nuxt.config customizes components: in a way fallow does not model, and composable/util fallbacks are kept when it customizes imports:; a config that scans no more than the Nuxt defaults (components: false, components: [], components: { dirs: [] }, components: true, imports: { scan: false }, imports: {}, imports: { dirs: [] }) is treated like the default and its fallbacks are dropped; imports: { autoImport: false } on its own is not, because it only switches the injection off while the same directories stay registered behind #imports. A nuxt.config that carries any top-level key fallow cannot read statically, a computed key, an accessor, or a spread such as { ...base, devtools: {} }, keeps both surfaces' fallbacks for that root, because the spread may hold the keys that decide. Only top-level keys count when the config object is readable: a nested key such as a routeRules path ending in components does not keep a fallback. Nested components or imports keys in $production, $development, $test or `$env.<name>`, and components or imports hooks (a components:* key or a nested components object in hooks, also inside those overrides), count as that surface's key; such an override object or hooks object that fallow cannot read statically falls back to a text match for the keys. Each root is classified on its own config plus the configs of its local layers, so one custom nuxt.config in a monorepo does not keep every other workspace's fallbacks. A local layer is a directory named in extends, or a `layers/<name>` directory, that holds a nuxt.config; its convention files are entry points with the flag off and auto-import sources with it on, and `#layers/<name>/` resolves to it by its $meta.name (a `layers/<name>` directory without one uses its directory name). A remote or package layer is only a dependency reference. Component names follow Nuxt: a component under components/global or components/islands is named after its own directory (components/global/Foo.vue is `<Foo>`), and .client, .server, .global and .island suffixes are stripped. A name imported or re-exported by hand from #components or #imports credits its convention file just like a template tag or a bare call; a namespace import names nothing and credits nothing. Boolean, defaults to false; set it for a Nuxt project that has explicitly configured its auto-import directories. Synthesis of auto-import graph edges (resolving `<Card />` or `useUserStore()` to their convention files) happens regardless of this flag.
    #[serde(default)]
    pub auto_imports: bool,

    /// When true, the run fails with exit code 1 if fallow could not parse a source file cleanly (a `source-parse-degraded` entry in `workspace_diagnostics[]`), and the `parse-error` entry of `gate_outcomes` names each such file. Boolean, defaults to false, so a file the parser rejects only warns. Applies to `fallow dead-code`, `fallow health`, `fallow audit` and the bare `fallow` run; the CLI flag `--fail-on-parse-error` arms the same gate for one run. Older fallow versions reject this key as unknown, so pair it with `minimumVersion` set to the release that added it.
    #[serde(default)]
    pub fail_on_parse_error: bool,

    /// Overrides the location and size ceiling of fallow's persistent extraction cache (default `.fallow/cache.bin` under the project root). Set to relocate the cache or cap its footprint; the object holds `dir` (cache directory, relative paths resolve from the project root) and `maxSizeMb` (extraction-cache size limit in megabytes). The `FALLOW_CACHE_MAX_SIZE` environment variable overrides `maxSizeMb`.
    #[serde(default, skip_serializing_if = "CacheConfig::is_default")]
    pub cache: CacheConfig,
}

/// Scopes `fallow security` catalogue behavior. An absent category block admits
/// every catalogue category. `hardcoded-secret` is include-required and only
/// runs when explicitly listed in `security.categories.include`.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
pub struct SecurityConfig {
    /// Include/exclude filter over category ids (e.g. `dangerous-html`).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub categories: Option<SecurityCategories>,
    /// Additional project-local names for HTTP request objects. These names
    /// extend the built-in receiver allowlist for `*.query`, `*.params`, and
    /// `*.body` source patterns. They do not replace the built-ins and do not
    /// gate `*.searchParams`, which intentionally stays ungated.
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub request_receivers: Vec<String>,
}

impl SecurityConfig {
    /// The configured `requestReceivers` trimmed, lowercased, and deduplicated
    /// in first-seen order, with empty entries dropped; the form the matcher
    /// compares receiver names against (matching is case-insensitive).
    #[must_use]
    pub fn normalized_request_receivers(&self) -> Vec<String> {
        let mut receivers = Vec::new();
        for receiver in &self.request_receivers {
            let normalized = receiver.trim().to_ascii_lowercase();
            if !normalized.is_empty() && !receivers.contains(&normalized) {
                receivers.push(normalized);
            }
        }
        receivers
    }

    /// False when any configured receiver is empty or whitespace-only, which
    /// config validation reports as an error instead of silently dropping it.
    #[must_use]
    pub fn request_receivers_are_valid(&self) -> bool {
        self.request_receivers
            .iter()
            .all(|receiver| !receiver.trim().is_empty())
    }
}

/// Include/exclude lists scoping the active security categories. When `include`
/// is set, only those categories are active; `exclude` removes categories from
/// the admitted set. Both unset admits catalogue categories. `hardcoded-secret`
/// still requires explicit inclusion.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
pub struct SecurityCategories {
    /// Catalogue category ids to admit. When set, all others are excluded.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub include: Option<Vec<String>>,
    /// Catalogue category ids to remove from the admitted set.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub exclude: Option<Vec<String>>,
}

/// The `cache` config section: location and size ceiling of fallow's
/// persistent caches (default directory `<root>/.fallow`).
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(deny_unknown_fields, rename_all = "camelCase")]
pub struct CacheConfig {
    /// Directory for fallow's persistent analysis cache. Relative paths resolve
    /// from the project root.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub dir: Option<PathBuf>,
    /// Maximum size of the persistent extraction cache, in megabytes.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub max_size_mb: Option<u32>,
}

impl CacheConfig {
    /// True when neither field is set, so serialization can omit the section.
    #[must_use]
    pub fn is_default(&self) -> bool {
        self.dir.is_none() && self.max_size_mb.is_none()
    }
}

/// The analysis families production mode can be scoped to independently via
/// the object form of the `production` config key.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ProductionAnalysis {
    /// Unused files/exports/dependencies detection.
    DeadCode,
    /// Complexity and health scoring.
    Health,
    /// Clone detection.
    Dupes,
}

/// Value of the `production` config key: excludes test/spec/story/dev files
/// from discovery, either globally or per analysis family.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, JsonSchema)]
#[serde(untagged)]
pub enum ProductionConfig {
    /// Boolean form applying to every analysis. The default is `false`.
    Global(bool),
    /// Object form (`{ deadCode?, health?, dupes? }`) scoping production mode
    /// per analysis family.
    PerAnalysis(PerAnalysisProductionConfig),
}

impl<'de> Deserialize<'de> for ProductionConfig {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct ProductionConfigVisitor;

        impl<'de> serde::de::Visitor<'de> for ProductionConfigVisitor {
            type Value = ProductionConfig;

            fn expecting(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                formatter.write_str("a boolean or per-analysis production config object")
            }

            fn visit_bool<E>(self, value: bool) -> Result<Self::Value, E>
            where
                E: serde::de::Error,
            {
                Ok(ProductionConfig::Global(value))
            }

            fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error>
            where
                A: serde::de::MapAccess<'de>,
            {
                PerAnalysisProductionConfig::deserialize(
                    serde::de::value::MapAccessDeserializer::new(map),
                )
                .map(ProductionConfig::PerAnalysis)
            }
        }

        deserializer.deserialize_any(ProductionConfigVisitor)
    }
}

impl Default for ProductionConfig {
    fn default() -> Self {
        Self::Global(false)
    }
}

impl From<bool> for ProductionConfig {
    fn from(value: bool) -> Self {
        Self::Global(value)
    }
}

impl Not for ProductionConfig {
    type Output = bool;

    fn not(self) -> Self::Output {
        !self.any_enabled()
    }
}

impl ProductionConfig {
    /// Whether production mode applies to `analysis` under this config.
    #[must_use]
    pub const fn for_analysis(self, analysis: ProductionAnalysis) -> bool {
        match self {
            Self::Global(value) => value,
            Self::PerAnalysis(config) => match analysis {
                ProductionAnalysis::DeadCode => config.dead_code,
                ProductionAnalysis::Health => config.health,
                ProductionAnalysis::Dupes => config.dupes,
            },
        }
    }

    /// The boolean form's value; `false` for the per-analysis form, which has
    /// no global toggle.
    #[must_use]
    pub const fn global(self) -> bool {
        match self {
            Self::Global(value) => value,
            Self::PerAnalysis(_) => false,
        }
    }

    /// Whether production mode is enabled for at least one analysis family.
    #[must_use]
    pub const fn any_enabled(self) -> bool {
        match self {
            Self::Global(value) => value,
            Self::PerAnalysis(config) => config.dead_code || config.health || config.dupes,
        }
    }
}

/// Object form of the `production` config key, scoping production mode to
/// individual analysis families in combined `fallow` and `fallow audit`.
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(default, deny_unknown_fields, rename_all = "camelCase")]
pub struct PerAnalysisProductionConfig {
    /// When `production` is a per-analysis object, enables production mode for dead-code analysis only (boolean, default false): unused-files/exports/dependencies detection excludes test/spec/story/dev files and forces `unused-dev-dependencies`/`unused-optional-dependencies` to `off`, while health and dupes stay on the full tree. Set it to scope production analysis to dead code independently.
    pub dead_code: bool,
    /// When `production` is a per-analysis object, enables production mode for the health/complexity analysis only (boolean, default false), so `fallow health` in combined `fallow` and `fallow audit` scores only shipped code (test/spec/story/dev files excluded) while dead-code and dupes stay on the full tree. Set it to scope production analysis to health independently.
    pub health: bool,
    /// When `production` is a per-analysis object, enables production mode for duplication analysis only (boolean, default false), so clone detection runs on shipped code only (test/spec/story/dev files excluded) while dead-code and health stay on the full tree. Set it to scope production analysis to dupes independently.
    pub dupes: bool,
}

/// The `audit` config section: in-repo defaults for `fallow audit`, each
/// overridable by its matching CLI flag.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct AuditConfig {
    /// Selects which findings affect the `fallow audit` verdict: `new-only` (default) fails only on findings introduced by the current changeset (running a base-snapshot attribution pass), while `all` fails on every finding in changed files and skips that pass. Set to `all` to gate the full backlog in changed files; the `--gate` CLI flag overrides this.
    #[serde(default, skip_serializing_if = "AuditGate::is_default")]
    pub gate: AuditGate,

    /// Toggles styling analytics (CSS and CSS-in-JS) in the `fallow audit` health sub-pass; these findings are descriptive and verdict-neutral by default (they change the exit code only when a css-* rule is set to error). Defaults to on when unset; set `false` to skip styling analysis. The `--no-css` CLI flag forces it off regardless.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub css: Option<bool>,

    /// Toggles the project-wide CSS reachability pass in `fallow audit`, whose cross-file findings are narrowed back to changed anchors. Defaults to on when unset and runs only when css analytics are enabled; set `false` to keep local styling analytics but skip the whole-project scan. The `--css-deep` flag re-enables it and `--no-css-deep` forces it off.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub css_deep: Option<bool>,

    /// Path to a saved dead-code baseline file (produced by `fallow dead-code --save-baseline`) that the audit's dead-code sub-analysis compares against, suppressing pre-existing dead-code issues. The `--dead-code-baseline` CLI flag overrides it and both resolve relative to the project root; each sub-analysis uses a distinct baseline format, so this is separate from `healthBaseline` and `dupesBaseline`.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub dead_code_baseline: Option<String>,

    /// Path to a saved health/complexity baseline file (produced by `fallow health --save-baseline`) that the audit's health sub-analysis compares against, suppressing pre-existing complexity/health findings. The `--health-baseline` CLI flag overrides it and both resolve relative to the project root; its baseline format is distinct from the dead-code and dupes baselines.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub health_baseline: Option<String>,

    /// Path to a saved duplication baseline file (produced by `fallow dupes --save-baseline`) that the audit's duplication sub-analysis compares clone groups against, suppressing pre-existing duplicate clones. The `--dupes-baseline` CLI flag overrides it and both resolve relative to the project root; its baseline format is distinct from the dead-code and health baselines.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub dupes_baseline: Option<String>,

    /// Garbage-collection threshold, in whole days, for the persistent reusable base-snapshot worktree caches `fallow audit` creates: entries older than this window are swept on each audit run. Set to control cache accumulation; `0` disables the sweep and unset defaults to 30 days. Each sweep also reclaims abandoned entries minted under other repo identities (deleted or moved repos, other git worktrees) once they age past this repo's threshold; entries whose recorded owner root still exists are skipped and stay governed by that repo's own setting. The `FALLOW_AUDIT_CACHE_MAX_AGE_DAYS` environment variable overrides this field.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub cache_max_age_days: Option<u32>,

    /// Overrides the top-level `typeAware.enabled` opt-in for `fallow audit` only: set `false` to keep persistent type-aware analysis on for cleanup commands (`dead-code`, `fix`, `health`) while the audit gate stays syntactic, or `true` to enable it for audit alone. Unset inherits `typeAware.enabled`. The `--type-aware`/`--no-type-aware` CLI flags and the `FALLOW_TYPE_AWARE` environment variable both take precedence over this field.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub type_aware: Option<bool>,
}

impl AuditConfig {
    /// True when every field is unset, so serialization can omit the section.
    #[must_use]
    pub fn is_empty(&self) -> bool {
        self.gate.is_default()
            && self.css.is_none()
            && self.css_deep.is_none()
            && self.dead_code_baseline.is_none()
            && self.health_baseline.is_none()
            && self.dupes_baseline.is_none()
            && self.cache_max_age_days.is_none()
            && self.type_aware.is_none()
    }
}

/// Value of `audit.gate`: which findings drive the `fallow audit` verdict.
#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "kebab-case")]
pub enum AuditGate {
    /// Fail only on findings the current changeset introduced, determined by
    /// a base-snapshot attribution pass. The default.
    #[default]
    NewOnly,
    /// Fail on every finding in changed files, skipping the attribution pass.
    All,
}

impl AuditGate {
    /// True for the default `new-only` gate, so serialization can omit it.
    #[must_use]
    pub const fn is_default(&self) -> bool {
        matches!(self, Self::NewOnly)
    }
}

/// The `regression` config section holding the saved issue-count baseline for
/// the `--fail-on-regression` gate.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct RegressionConfig {
    /// The saved per-issue-type issue counts that `--fail-on-regression` compares the current run against; the gate fails only when counts grow beyond the configured tolerance. Typically written by `--save-baseline` rather than hand-authored; each field (total_issues plus per-kind counts like unused_exports, boundary_violations, policy_violations) is an integer defaulting to 0 when omitted. Absent means no baseline is embedded.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub baseline: Option<RegressionBaseline>,
}

/// Saved per-issue-type counts written by `--save-baseline` and compared by
/// `--fail-on-regression`. Every count defaults to `0` when its key is missing,
/// so hand-trimmed baselines stay loadable.
#[derive(Debug, Default, Clone, Deserialize, Serialize, JsonSchema)]
#[serde(rename_all = "camelCase")]
pub struct RegressionBaseline {
    /// Baseline count of optional component prop review candidates.
    #[serde(default)]
    pub absent_component_props: usize,

    /// Compatibility identity for the analysis that produced these counts.
    /// Missing values in existing configs are treated as syntactic.
    #[serde(default)]
    pub analysis_identity: fallow_types::semantic::SemanticAnalysisIdentity,
    /// Baseline count across all issue types.
    #[serde(default)]
    pub total_issues: usize,
    /// Baseline count of `unused-files` findings.
    #[serde(default)]
    pub unused_files: usize,
    /// Baseline count of `unused-exports` findings.
    #[serde(default)]
    pub unused_exports: usize,
    /// Baseline count of `unused-types` findings.
    #[serde(default)]
    pub unused_types: usize,
    /// Baseline count of `unused-dependencies` findings.
    #[serde(default)]
    pub unused_dependencies: usize,
    /// Baseline count of `unused-dev-dependencies` findings.
    #[serde(default)]
    pub unused_dev_dependencies: usize,
    /// Baseline count of `unused-optional-dependencies` findings.
    #[serde(default)]
    pub unused_optional_dependencies: usize,
    /// Baseline count of `unused-enum-members` findings.
    #[serde(default)]
    pub unused_enum_members: usize,
    /// Baseline count of `unused-class-members` findings.
    #[serde(default)]
    pub unused_class_members: usize,
    /// Baseline count of `unresolved-imports` findings.
    #[serde(default)]
    pub unresolved_imports: usize,
    /// Baseline count of `unlisted-dependencies` findings.
    #[serde(default)]
    pub unlisted_dependencies: usize,
    /// Baseline count of `duplicate-exports` findings.
    #[serde(default)]
    pub duplicate_exports: usize,
    /// Baseline count of `circular-dependencies` findings.
    #[serde(default)]
    pub circular_dependencies: usize,
    /// Baseline count of `re-export-cycle` findings.
    #[serde(default)]
    pub re_export_cycles: usize,
    /// Baseline count of `package-cycle` findings.
    #[serde(default)]
    pub package_cycles: usize,
    /// Baseline count of `type-only-dependencies` findings.
    #[serde(default)]
    pub type_only_dependencies: usize,
    /// Baseline count of `test-only-dependencies` findings.
    #[serde(default)]
    pub test_only_dependencies: usize,
    /// Baseline count of `dev-dependencies-in-production` findings.
    #[serde(default)]
    pub dev_dependencies_in_production: usize,
    /// Baseline count of `boundary-violation` findings.
    #[serde(default)]
    pub boundary_violations: usize,
    /// Baseline count of boundary-coverage-violation findings.
    #[serde(default)]
    pub boundary_coverage_violations: usize,
    /// Baseline count of boundary-call-violation findings.
    #[serde(default)]
    pub boundary_call_violations: usize,
    /// Baseline count of `policy-violation` findings.
    #[serde(default)]
    pub policy_violations: usize,
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn regression_baseline_preserves_absent_component_prop_count() {
        let baseline: RegressionBaseline =
            serde_json::from_value(serde_json::json!({"absentComponentProps":7})).unwrap();
        assert_eq!(
            serde_json::to_value(baseline).unwrap()["absentComponentProps"],
            7
        );
    }

    #[test]
    fn default_config_has_empty_collections() {
        let config = FallowConfig::default();
        assert!(config.schema.is_none());
        assert!(config.extends.is_empty());
        assert!(config.entry.is_empty());
        assert!(config.ignore_patterns.is_empty());
        assert!(config.ignore_findings.is_empty());
        assert!(config.framework.is_empty());
        assert!(config.workspaces.is_none());
        assert!(config.ignore_dependencies.is_empty());
        assert!(config.ignore_exports.is_empty());
        assert!(config.used_class_members.is_empty());
        assert!(config.plugins.is_empty());
        assert!(config.dynamically_loaded.is_empty());
        assert!(config.overrides.is_empty());
        assert!(config.public_packages.is_empty());
        assert_eq!(
            config.fix.catalog.delete_preceding_comments,
            CatalogPrecedingCommentPolicy::Auto
        );
        assert!(!config.production);
    }

    #[test]
    fn deserialize_empty_json_object() {
        let config: FallowConfig = serde_json::from_str("{}").unwrap();
        assert!(config.entry.is_empty());
        assert!(!config.production);
        assert!(!config.type_aware.enabled);
        assert_eq!(config.type_aware.require, TypeAwareRequire::BestEffort);
    }

    #[test]
    fn deserialize_type_aware_config() {
        let config: FallowConfig = serde_json::from_str(
            r#"{"typeAware":{"enabled":true,"projects":["tsconfig.app.json"],"require":"complete"}}"#,
        )
        .unwrap();

        assert!(config.type_aware.enabled);
        assert_eq!(config.type_aware.projects, ["tsconfig.app.json"]);
        assert_eq!(config.type_aware.require, TypeAwareRequire::Complete);
    }

    #[test]
    fn deserialize_type_aware_config_rejects_unknown_fields() {
        let result = serde_json::from_str::<FallowConfig>(
            r#"{"typeAware":{"enabled":true,"compilerDiagnostics":true}}"#,
        );
        assert!(result.is_err());
    }

    #[test]
    fn deserialize_json_with_all_top_level_fields() {
        let json = r#"{
            "$schema": "./node_modules/fallow/schema.json",
            "entry": ["src/main.ts"],
            "ignorePatterns": ["generated/**"],
            "ignoreFindings": ["**/*.test.ts", "!src/public/**"],
            "ignoreDependencies": ["postcss"],
            "production": true,
            "plugins": ["custom-plugin.toml"],
            "rules": {"unused-files": "warn"},
            "duplicates": {"enabled": false},
            "health": {"maxCyclomatic": 30}
        }"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(
            config.schema.as_deref(),
            Some("./node_modules/fallow/schema.json")
        );
        assert_eq!(config.entry, vec!["src/main.ts"]);
        assert_eq!(config.ignore_patterns, vec!["generated/**"]);
        assert_eq!(
            config.ignore_findings,
            vec!["**/*.test.ts", "!src/public/**"]
        );
        assert_eq!(config.ignore_dependencies, vec!["postcss"]);
        assert!(config.production);
        assert_eq!(config.plugins, vec!["custom-plugin.toml"]);
        assert_eq!(config.rules.unused_files, Severity::Warn);
        assert!(!config.duplicates.enabled);
        assert_eq!(config.health.max_cyclomatic, 30);
    }

    #[test]
    fn deserialize_json_deny_unknown_fields() {
        let json = r#"{"unknownField": true}"#;
        let result: Result<FallowConfig, _> = serde_json::from_str(json);
        assert!(result.is_err(), "unknown fields should be rejected");
    }

    #[test]
    fn ignore_findings_serialization_is_canonical_and_sparse() {
        let default_value = serde_json::to_value(FallowConfig::default()).unwrap();
        assert!(default_value.get("ignoreFindings").is_none());

        let config = FallowConfig {
            ignore_findings: vec!["**/*.test.ts".to_string(), "!src/public/**".to_string()],
            ..Default::default()
        };
        let value = serde_json::to_value(config).unwrap();
        assert_eq!(
            value.get("ignoreFindings"),
            Some(&serde_json::json!(["**/*.test.ts", "!src/public/**"]))
        );
    }

    #[test]
    fn ignore_findings_deserializes_from_toml() {
        let config: FallowConfig =
            toml::from_str(r#"ignoreFindings = ["**/*.test.ts", "!src/public/**"]"#).unwrap();

        assert_eq!(
            config.ignore_findings,
            vec!["**/*.test.ts", "!src/public/**"]
        );
    }

    #[test]
    fn generic_ignore_alias_is_rejected() {
        let result = serde_json::from_str::<FallowConfig>(r#"{"ignore": ["**/*.test.ts"]}"#);

        assert!(result.is_err());
    }

    #[test]
    fn deserialize_json_production_mode_default_false() {
        let config: FallowConfig = serde_json::from_str("{}").unwrap();
        assert!(!config.production);
    }

    #[test]
    fn deserialize_json_production_mode_true() {
        let config: FallowConfig = serde_json::from_str(r#"{"production": true}"#).unwrap();
        assert!(config.production);
    }

    #[test]
    fn deserialize_json_per_analysis_production_mode() {
        let config: FallowConfig = serde_json::from_str(
            r#"{"production": {"deadCode": false, "health": true, "dupes": false}}"#,
        )
        .unwrap();
        assert!(!config.production.for_analysis(ProductionAnalysis::DeadCode));
        assert!(config.production.for_analysis(ProductionAnalysis::Health));
        assert!(!config.production.for_analysis(ProductionAnalysis::Dupes));
    }

    #[test]
    fn deserialize_json_per_analysis_production_mode_rejects_unknown_fields() {
        let err = serde_json::from_str::<FallowConfig>(r#"{"production": {"healthTypo": true}}"#)
            .unwrap_err();
        assert!(
            err.to_string().contains("healthTypo"),
            "error should name the unknown field: {err}"
        );
    }

    #[test]
    fn deserialize_json_dynamically_loaded() {
        let json = r#"{"dynamicallyLoaded": ["plugins/**/*.ts", "locales/**/*.json"]}"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(
            config.dynamically_loaded,
            vec!["plugins/**/*.ts", "locales/**/*.json"]
        );
    }

    #[test]
    fn deserialize_json_dynamically_loaded_defaults_empty() {
        let config: FallowConfig = serde_json::from_str("{}").unwrap();
        assert!(config.dynamically_loaded.is_empty());
    }

    #[test]
    fn deserialize_json_fix_catalog_delete_preceding_comments() {
        let config: FallowConfig =
            serde_json::from_str(r#"{"fix": {"catalog": {"deletePrecedingComments": "always"}}}"#)
                .unwrap();
        assert_eq!(
            config.fix.catalog.delete_preceding_comments,
            CatalogPrecedingCommentPolicy::Always
        );
    }

    #[test]
    fn deserialize_json_fix_catalog_delete_preceding_comments_rejects_unknown_policy() {
        let err = serde_json::from_str::<FallowConfig>(
            r#"{"fix": {"catalog": {"deletePrecedingComments": "sometimes"}}}"#,
        )
        .unwrap_err();
        assert!(
            err.to_string().contains("sometimes"),
            "error should name the bad policy: {err}"
        );
    }

    #[test]
    fn deserialize_json_used_class_members_supports_strings_and_scoped_rules() {
        let json = r#"{
            "usedClassMembers": [
                "agInit",
                { "implements": "ICellRendererAngularComp", "members": ["refresh"] },
                { "extends": "BaseCommand", "implements": "CanActivate", "members": ["execute"] }
            ]
        }"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(
            config.used_class_members,
            vec![
                UsedClassMemberRule::from("agInit"),
                UsedClassMemberRule::Scoped(ScopedUsedClassMemberRule {
                    extends: None,
                    implements: Some("ICellRendererAngularComp".to_string()),
                    members: vec!["refresh".to_string()],
                }),
                UsedClassMemberRule::Scoped(ScopedUsedClassMemberRule {
                    extends: Some("BaseCommand".to_string()),
                    implements: Some("CanActivate".to_string()),
                    members: vec!["execute".to_string()],
                }),
            ]
        );
    }

    #[test]
    fn deserialize_toml_minimal() {
        let toml_str = r#"
entry = ["src/index.ts"]
production = true
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(config.entry, vec!["src/index.ts"]);
        assert!(config.production);
    }

    #[test]
    fn workspaces_packages_key_is_accepted_as_patterns_alias() {
        // An older `fallow init --toml` wrote `[workspaces]` with a `packages`
        // key; the back-compat serde alias keeps those existing configs scoping
        // instead of silently dropping the (unknown) key and losing the patterns.
        let config: FallowConfig =
            toml::from_str("[workspaces]\npackages = [\"packages/*\", \"apps/*\"]").unwrap();
        assert_eq!(
            config.workspaces.map(|w| w.patterns).unwrap_or_default(),
            vec!["packages/*".to_string(), "apps/*".to_string()],
            "the `packages` alias must populate `patterns`"
        );
    }

    #[test]
    fn deserialize_toml_per_analysis_production_mode() {
        let toml_str = r"
[production]
deadCode = false
health = true
dupes = false
";
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert!(!config.production.for_analysis(ProductionAnalysis::DeadCode));
        assert!(config.production.for_analysis(ProductionAnalysis::Health));
        assert!(!config.production.for_analysis(ProductionAnalysis::Dupes));
    }

    #[test]
    fn deserialize_toml_per_analysis_production_mode_rejects_unknown_fields() {
        let err = toml::from_str::<FallowConfig>(
            r"
[production]
healthTypo = true
",
        )
        .unwrap_err();
        assert!(
            err.to_string().contains("healthTypo"),
            "error should name the unknown field: {err}"
        );
    }

    #[test]
    fn deserialize_toml_with_inline_framework() {
        let toml_str = r#"
[[framework]]
name = "my-framework"
enablers = ["my-framework-pkg"]
entryPoints = ["src/routes/**/*.tsx"]
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(config.framework.len(), 1);
        assert_eq!(config.framework[0].name, "my-framework");
        assert_eq!(config.framework[0].enablers, vec!["my-framework-pkg"]);
        assert_eq!(
            config.framework[0].entry_points,
            vec!["src/routes/**/*.tsx"]
        );
    }

    #[test]
    fn deserialize_toml_fix_catalog_delete_preceding_comments() {
        let toml_str = r#"
[fix.catalog]
deletePrecedingComments = "never"
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(
            config.fix.catalog.delete_preceding_comments,
            CatalogPrecedingCommentPolicy::Never
        );
    }

    #[test]
    fn deserialize_toml_with_workspace_config() {
        let toml_str = r#"
[workspaces]
patterns = ["packages/*", "apps/*"]
[workspaces.changedSince]
"packages/web" = "main"
"packages/legacy" = "release/2024.10"
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert!(config.workspaces.is_some());
        let ws = config.workspaces.unwrap();
        assert_eq!(ws.patterns, vec!["packages/*", "apps/*"]);
        assert_eq!(ws.changed_since["packages/web"], "main");
        assert_eq!(ws.changed_since["packages/legacy"], "release/2024.10");
    }

    #[test]
    fn deserialize_toml_with_ignore_exports() {
        let toml_str = r#"
[[ignoreExports]]
file = "src/types/**/*.ts"
exports = ["*"]
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(config.ignore_exports.len(), 1);
        assert_eq!(config.ignore_exports[0].file, "src/types/**/*.ts");
        assert_eq!(config.ignore_exports[0].exports, vec!["*"]);
    }

    #[test]
    fn deserialize_toml_used_class_members_supports_scoped_rules() {
        let toml_str = r#"
usedClassMembers = [
  { implements = "ICellRendererAngularComp", members = ["refresh"] },
  { extends = "BaseCommand", members = ["execute"] },
]
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(
            config.used_class_members,
            vec![
                UsedClassMemberRule::Scoped(ScopedUsedClassMemberRule {
                    extends: None,
                    implements: Some("ICellRendererAngularComp".to_string()),
                    members: vec!["refresh".to_string()],
                }),
                UsedClassMemberRule::Scoped(ScopedUsedClassMemberRule {
                    extends: Some("BaseCommand".to_string()),
                    implements: None,
                    members: vec!["execute".to_string()],
                }),
            ]
        );
    }

    #[test]
    fn deserialize_json_used_class_members_rejects_unconstrained_scoped_rules() {
        let result = serde_json::from_str::<FallowConfig>(
            r#"{"usedClassMembers":[{"members":["refresh"]}]}"#,
        );
        assert!(
            result.is_err(),
            "unconstrained scoped rule should be rejected"
        );
    }

    #[test]
    fn deserialize_ignore_exports_used_in_file_bool() {
        let config: FallowConfig =
            serde_json::from_str(r#"{"ignoreExportsUsedInFile":true}"#).unwrap();

        assert!(config.ignore_exports_used_in_file.suppresses(false));
        assert!(config.ignore_exports_used_in_file.suppresses(true));
    }

    #[test]
    fn deserialize_ignore_exports_used_in_file_kind_form() {
        let config: FallowConfig =
            serde_json::from_str(r#"{"ignoreExportsUsedInFile":{"type":true}}"#).unwrap();

        assert!(!config.ignore_exports_used_in_file.suppresses(false));
        assert!(config.ignore_exports_used_in_file.suppresses(true));
    }

    #[test]
    fn deserialize_toml_deny_unknown_fields() {
        let toml_str = r"bogus_field = true";
        let result: Result<FallowConfig, _> = toml::from_str(toml_str);
        assert!(result.is_err(), "unknown fields should be rejected");
    }

    #[test]
    fn json_serialize_roundtrip() {
        let config = FallowConfig {
            entry: vec!["src/main.ts".to_string()],
            production: true.into(),
            ..FallowConfig::default()
        };
        let json = serde_json::to_string(&config).unwrap();
        let restored: FallowConfig = serde_json::from_str(&json).unwrap();
        assert_eq!(restored.entry, vec!["src/main.ts"]);
        assert!(restored.production);
    }

    #[test]
    fn schema_field_not_serialized() {
        let config = FallowConfig {
            schema: Some("https://example.com/schema.json".to_string()),
            ..FallowConfig::default()
        };
        let json = serde_json::to_string(&config).unwrap();
        assert!(
            !json.contains("$schema"),
            "schema field should be skipped in serialization"
        );
    }

    #[test]
    fn extends_field_not_serialized() {
        let config = FallowConfig {
            extends: vec!["base.json".to_string()],
            ..FallowConfig::default()
        };
        let json = serde_json::to_string(&config).unwrap();
        assert!(
            !json.contains("extends"),
            "extends field should be skipped in serialization"
        );
    }

    #[test]
    fn regression_config_deserialize_json() {
        let json = r#"{
            "regression": {
                "baseline": {
                    "totalIssues": 42,
                    "unusedFiles": 10,
                    "unusedExports": 5,
                    "circularDependencies": 2
                }
            }
        }"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        let regression = config.regression.unwrap();
        let baseline = regression.baseline.unwrap();
        assert_eq!(baseline.total_issues, 42);
        assert_eq!(baseline.unused_files, 10);
        assert_eq!(baseline.unused_exports, 5);
        assert_eq!(baseline.circular_dependencies, 2);
        assert_eq!(baseline.unused_types, 0);
        assert_eq!(baseline.boundary_violations, 0);
    }

    #[test]
    fn regression_config_defaults_to_none() {
        let config: FallowConfig = serde_json::from_str("{}").unwrap();
        assert!(config.regression.is_none());
    }

    #[test]
    fn regression_baseline_all_zeros_by_default() {
        let baseline = RegressionBaseline::default();
        assert_eq!(baseline.total_issues, 0);
        assert_eq!(baseline.unused_files, 0);
        assert_eq!(baseline.unused_exports, 0);
        assert_eq!(baseline.unused_types, 0);
        assert_eq!(baseline.unused_dependencies, 0);
        assert_eq!(baseline.unused_dev_dependencies, 0);
        assert_eq!(baseline.unused_optional_dependencies, 0);
        assert_eq!(baseline.unused_enum_members, 0);
        assert_eq!(baseline.unused_class_members, 0);
        assert_eq!(baseline.unresolved_imports, 0);
        assert_eq!(baseline.unlisted_dependencies, 0);
        assert_eq!(baseline.duplicate_exports, 0);
        assert_eq!(baseline.circular_dependencies, 0);
        assert_eq!(baseline.type_only_dependencies, 0);
        assert_eq!(baseline.test_only_dependencies, 0);
        assert_eq!(baseline.boundary_violations, 0);
    }

    #[test]
    fn regression_config_serialize_roundtrip() {
        let baseline = RegressionBaseline {
            total_issues: 100,
            unused_files: 20,
            unused_exports: 30,
            ..RegressionBaseline::default()
        };
        let regression = RegressionConfig {
            baseline: Some(baseline),
        };
        let config = FallowConfig {
            regression: Some(regression),
            ..FallowConfig::default()
        };
        let json = serde_json::to_string(&config).unwrap();
        let restored: FallowConfig = serde_json::from_str(&json).unwrap();
        let restored_baseline = restored.regression.unwrap().baseline.unwrap();
        assert_eq!(restored_baseline.total_issues, 100);
        assert_eq!(restored_baseline.unused_files, 20);
        assert_eq!(restored_baseline.unused_exports, 30);
        assert_eq!(restored_baseline.unused_types, 0);
    }

    #[test]
    fn regression_config_empty_baseline_deserialize() {
        let json = r#"{"regression": {}}"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        let regression = config.regression.unwrap();
        assert!(regression.baseline.is_none());
    }

    #[test]
    fn regression_baseline_not_serialized_when_none() {
        let config = FallowConfig {
            regression: None,
            ..FallowConfig::default()
        };
        let json = serde_json::to_string(&config).unwrap();
        assert!(
            !json.contains("regression"),
            "regression should be skipped when None"
        );
    }

    #[test]
    fn deserialize_json_with_overrides() {
        let json = r#"{
            "overrides": [
                {
                    "files": ["*.test.ts", "*.spec.ts"],
                    "rules": {
                        "unused-exports": "off",
                        "unused-files": "warn"
                    }
                }
            ]
        }"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(config.overrides.len(), 1);
        assert_eq!(config.overrides[0].files.len(), 2);
        assert_eq!(
            config.overrides[0].rules.unused_exports,
            Some(Severity::Off)
        );
        assert_eq!(config.overrides[0].rules.unused_files, Some(Severity::Warn));
    }

    #[test]
    fn deserialize_json_with_boundaries() {
        let json = r#"{
            "boundaries": {
                "preset": "layered"
            }
        }"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(config.boundaries.preset, Some(BoundaryPreset::Layered));
    }

    #[test]
    fn deserialize_toml_with_regression_baseline() {
        let toml_str = r"
[regression.baseline]
totalIssues = 50
unusedFiles = 10
unusedExports = 15
";
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        let baseline = config.regression.unwrap().baseline.unwrap();
        assert_eq!(baseline.total_issues, 50);
        assert_eq!(baseline.unused_files, 10);
        assert_eq!(baseline.unused_exports, 15);
    }

    #[test]
    fn deserialize_toml_with_overrides() {
        let toml_str = r#"
[[overrides]]
files = ["*.test.ts"]

[overrides.rules]
unused-exports = "off"

[[overrides]]
files = ["*.stories.tsx"]

[overrides.rules]
unused-files = "off"
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(config.overrides.len(), 2);
        assert_eq!(
            config.overrides[0].rules.unused_exports,
            Some(Severity::Off)
        );
        assert_eq!(config.overrides[1].rules.unused_files, Some(Severity::Off));
    }

    #[test]
    fn regression_config_default_is_none_baseline() {
        let config = RegressionConfig::default();
        assert!(config.baseline.is_none());
    }

    #[test]
    fn deserialize_json_multiple_ignore_export_rules() {
        let json = r#"{
            "ignoreExports": [
                {"file": "src/types/**/*.ts", "exports": ["*"]},
                {"file": "src/constants.ts", "exports": ["FOO", "BAR"]},
                {"file": "src/index.ts", "exports": ["default"]}
            ]
        }"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(config.ignore_exports.len(), 3);
        assert_eq!(config.ignore_exports[2].exports, vec!["default"]);
    }

    #[test]
    fn deserialize_json_public_packages_camel_case() {
        let json = r#"{"publicPackages": ["@myorg/shared-lib", "@myorg/utils"]}"#;
        let config: FallowConfig = serde_json::from_str(json).unwrap();
        assert_eq!(
            config.public_packages,
            vec!["@myorg/shared-lib", "@myorg/utils"]
        );
    }

    #[test]
    fn deserialize_json_public_packages_rejects_snake_case() {
        let json = r#"{"public_packages": ["@myorg/shared-lib"]}"#;
        let result: Result<FallowConfig, _> = serde_json::from_str(json);
        assert!(
            result.is_err(),
            "snake_case should be rejected by deny_unknown_fields + rename_all camelCase"
        );
    }

    #[test]
    fn deserialize_json_public_packages_empty() {
        let config: FallowConfig = serde_json::from_str("{}").unwrap();
        assert!(config.public_packages.is_empty());
    }

    #[test]
    fn deserialize_toml_public_packages() {
        let toml_str = r#"
publicPackages = ["@myorg/shared-lib", "@myorg/ui"]
"#;
        let config: FallowConfig = toml::from_str(toml_str).unwrap();
        assert_eq!(
            config.public_packages,
            vec!["@myorg/shared-lib", "@myorg/ui"]
        );
    }

    #[test]
    fn public_packages_serialize_roundtrip() {
        let config = FallowConfig {
            public_packages: vec!["@myorg/shared-lib".to_string()],
            ..FallowConfig::default()
        };
        let json = serde_json::to_string(&config).unwrap();
        let restored: FallowConfig = serde_json::from_str(&json).unwrap();
        assert_eq!(restored.public_packages, vec!["@myorg/shared-lib"]);
    }
}