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fallow_extract/
sfc.rs

1//! Vue/Svelte Single File Component (SFC) script and style extraction.
2//!
3//! Extracts `<script>` block content from `.vue` and `.svelte` files using regex,
4//! handling `lang`, `src` metadata, and `generic` attributes, and filtering
5//! HTML comments. Vue external script references are emitted as graph edges;
6//! Svelte markup-level script `src` references are treated as runtime HTML.
7//! Also extracts `<style>` block sources (`@import` / `@use` / `@forward` /
8//! `@plugin` and `<style src="...">`) so referenced CSS / SCSS files become
9//! reachable from the component, preventing false `unused-files` reports on
10//! co-located styles.
11
12use std::path::Path;
13use std::sync::LazyLock;
14
15use oxc_allocator::Allocator;
16use oxc_ast_visit::Visit;
17use oxc_parser::Parser;
18use oxc_span::SourceType;
19use rustc_hash::{FxHashMap, FxHashSet};
20
21use crate::asset_url::normalize_asset_url;
22use crate::parse::{
23    compute_auto_import_candidates, compute_import_binding_usage, compute_semantic_usage,
24};
25use crate::sfc_template::{SfcKind, collect_template_usage_with_bound_targets};
26use crate::source_map::ExtractionResult;
27use crate::visitor::ModuleInfoExtractor;
28use crate::{ImportInfo, ImportedName, ModuleInfo};
29use fallow_types::discover::FileId;
30use fallow_types::extract::{FunctionComplexity, byte_offset_to_line_col, compute_line_offsets};
31use oxc_span::Span;
32
33/// Regex to extract `<script>` block content from Vue/Svelte SFCs.
34/// The attrs pattern handles `>` inside quoted attribute values (e.g., `generic="T extends Foo<Bar>"`).
35static SCRIPT_BLOCK_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
36    crate::static_regex(
37        r#"(?is)<script\b(?P<attrs>(?:[^>"']|"[^"]*"|'[^']*')*)>(?P<body>[\s\S]*?)</script>"#,
38    )
39});
40
41/// Regex to extract the `lang` attribute value from a script tag.
42static LANG_ATTR_RE: LazyLock<regex::Regex> =
43    LazyLock::new(|| crate::static_regex(r#"lang\s*=\s*["'](\w+)["']"#));
44
45/// Regex to extract the `src` attribute value from a script tag.
46/// Requires whitespace (or start of string) before `src` to avoid matching `data-src` etc.
47static SRC_ATTR_RE: LazyLock<regex::Regex> =
48    LazyLock::new(|| crate::static_regex(r#"(?:^|\s)src\s*=\s*["']([^"']+)["']"#));
49
50/// Regex to detect Vue's bare `setup` attribute.
51static SETUP_ATTR_RE: LazyLock<regex::Regex> =
52    LazyLock::new(|| crate::static_regex(r"(?:^|\s)setup(?:\s|$)"));
53
54/// Regex to detect Svelte's `context="module"` attribute (Svelte 4).
55static CONTEXT_MODULE_ATTR_RE: LazyLock<regex::Regex> =
56    LazyLock::new(|| crate::static_regex(r#"context\s*=\s*["']module["']"#));
57
58/// Regex to detect Svelte 5's bare `module` script attribute (`<script module>`,
59/// `<script module lang="ts">`). Anchored like [`SETUP_ATTR_RE`] so `module` must
60/// be a standalone attribute, not a substring of another attr name (e.g.
61/// `data-module`) or value.
62static SVELTE_MODULE_ATTR_RE: LazyLock<regex::Regex> =
63    LazyLock::new(|| crate::static_regex(r"(?:^|\s)module(?:\s|$|=)"));
64
65/// Regex to extract Vue's `generic="..."` attribute value (script-setup
66/// generics). Matches the contents between the quotes and stops at the
67/// closing quote, mirroring `LANG_ATTR_RE`.
68static VUE_GENERIC_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
69    crate::static_regex(r#"(?:^|\s)generic\s*=\s*"([^"]*)"|(?:^|\s)generic\s*=\s*'([^']*)'"#)
70});
71
72/// Regex to extract Svelte's `generics="..."` attribute value (Svelte 4
73/// generic script attribute, repurposed by some Svelte 5 code).
74static SVELTE_GENERICS_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
75    crate::static_regex(r#"(?:^|\s)generics\s*=\s*"([^"]*)"|(?:^|\s)generics\s*=\s*'([^']*)'"#)
76});
77
78/// Regex to match HTML comments for filtering script blocks inside comments.
79static HTML_COMMENT_RE: LazyLock<regex::Regex> =
80    LazyLock::new(|| crate::static_regex(r"(?s)<!--.*?-->"));
81
82/// Regex to detect a whole-object prop/attr spread in a Vue template:
83/// `v-bind="$attrs"`, `v-bind="$props"`, or `v-bind="props"` (with single or
84/// double quotes). A bound prop may be consumed indirectly, so the
85/// `unused-component-prop` detector abstains on the whole file when this matches.
86static PROPS_ATTRS_SPREAD_RE: LazyLock<regex::Regex> =
87    LazyLock::new(|| crate::static_regex(r#"v-bind\s*=\s*["'](?:\$attrs|\$props|props)["']"#));
88
89/// FP-1 (unused-load-data-key): a SvelteKit route component passing the whole
90/// `data` prop opaquely in MARKUP, where a child reads arbitrary keys the
91/// detector cannot see. Matches `data={data}` (whole-prop pass to a child) and
92/// `{...data}` (Svelte template spread). The script-side `const x = {...data}` /
93/// `fn(data)` / `const X = data` forms are captured by the JS visitor instead.
94/// Only a whole-`data` pass forces the abstain; `data.x` member access stays a
95/// credited consumer.
96static SVELTE_TEMPLATE_DATA_WHOLE_USE_RE: LazyLock<regex::Regex> =
97    LazyLock::new(|| crate::static_regex(r"(?:=\s*\{\s*data\s*\}|\{\s*\.\.\.\s*data\s*\})"));
98
99/// Matches an emit-style call in template markup: a callee identifier (or
100/// `$emit`) followed by `(` and its first argument. Group 1 is the callee name
101/// (filtered against the harvested emit binding / `$emit` by the caller), groups
102/// 2 and 3 are a string-literal first arg (single- or double-quoted: the event
103/// name, credited as used), and group 4 is the first non-space character of a
104/// NON-literal first arg (a dynamic emit, whose event name is unknowable, forcing
105/// a whole-file abstain). Event names allow kebab and namespaced forms
106/// (`update:modelValue`, `my-event`). The Rust `regex` crate has no
107/// backreferences, so the two quote styles are separate alternatives.
108static TEMPLATE_EMIT_CALL_RE: LazyLock<regex::Regex> =
109    LazyLock::new(|| crate::static_regex(r#"([\w$]+)\s*\(\s*(?:'([\w:-]*)'|"([\w:-]*)"|(\S))"#));
110
111/// Regex to extract `<style>` block content from Vue/Svelte SFCs.
112/// Mirrors `SCRIPT_BLOCK_RE`: handles `>` inside quoted attribute values and
113/// captures the body so `@import` / `@use` / `@forward` directives can be parsed.
114static STYLE_BLOCK_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
115    crate::static_regex(
116        r#"(?is)<style\b(?P<attrs>(?:[^>"']|"[^"]*"|'[^']*')*)>(?P<body>[\s\S]*?)</style>"#,
117    )
118});
119
120/// Static asset references in SFC markup: `<img src="./logo.png">`,
121/// `<source src="...">`, `<video poster="...">`, etc.
122///
123/// Scoped to genuine asset elements (`img` / `source` / `video` / `audio` /
124/// `track` / `embed`) so a custom component's `src` PROP (`<MyImage src="./x">`)
125/// is never misread as an asset edge. ONLY plain relative literals (`./` or
126/// `../`) are captured: dynamic bindings (`:src`, `v-bind:src`, `bind:src`,
127/// `src={...}`, `data-src`), alias-prefixed (`@/`), root-relative (`/foo`),
128/// remote, interpolated (`{{ }}` / `{ }`), and query/hash-suffixed values are
129/// all skipped (the value class excludes `{`, `?`, `#`, whitespace, and angle
130/// brackets, and the alternation anchors on a leading `./` or `../`). A
131/// captured ref becomes a `SideEffect` import; an existing asset resolves to
132/// `ExternalFile` (no finding) and a genuinely-missing one surfaces as
133/// `unresolved-import` on the trusted resolver path.
134static TEMPLATE_ASSET_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
135    crate::static_regex(
136        r#"(?si)<(?:img|source|video|audio|track|embed)\b(?:[^>"']|"[^"]*"|'[^']*')*?\s(?:src|poster)\s*=\s*(?:"((?:\./|\.\./)[^"<>{}?#\s]*)"|'((?:\./|\.\./)[^'<>{}?#\s]*)')"#,
137    )
138});
139
140/// Mask `<script>` / `<style>` blocks and HTML comments to equal-length spaces
141/// so a markup-region scan (asset refs) sees only the template, while byte
142/// offsets still map 1:1 into the original source for line/col reporting.
143fn mask_non_markup_regions(source: &str) -> String {
144    let mut masked = source.to_string();
145    for re in [&*SCRIPT_BLOCK_RE, &*STYLE_BLOCK_RE, &*HTML_COMMENT_RE] {
146        masked = re
147            .replace_all(&masked, |caps: &regex::Captures<'_>| {
148                " ".repeat(caps[0].len())
149            })
150            .into_owned();
151    }
152    masked
153}
154
155/// Collect static relative asset references from SFC markup as
156/// `(normalized_specifier, value_span)` pairs. See [`TEMPLATE_ASSET_RE`].
157fn collect_template_asset_refs(source: &str) -> Vec<(String, Span)> {
158    let masked = mask_non_markup_regions(source);
159    let mut refs = Vec::new();
160    for caps in TEMPLATE_ASSET_RE.captures_iter(&masked) {
161        let Some(value) = caps.get(1).or_else(|| caps.get(2)) else {
162            continue;
163        };
164        let raw = value.as_str();
165        if raw.is_empty() {
166            continue;
167        }
168        refs.push((
169            normalize_asset_url(raw),
170            Span::new(value.start() as u32, value.end() as u32),
171        ));
172    }
173    refs
174}
175
176/// An extracted `<script>` block from a Vue or Svelte SFC.
177pub struct SfcScript {
178    /// The script body text.
179    pub body: String,
180    /// Whether the script uses TypeScript (`lang="ts"` or `lang="tsx"`).
181    pub is_typescript: bool,
182    /// Whether the script uses JSX syntax (`lang="tsx"` or `lang="jsx"`).
183    pub is_jsx: bool,
184    /// Byte offset of the script body within the full SFC source.
185    pub byte_offset: usize,
186    /// External script source path from `src` attribute.
187    pub src: Option<String>,
188    /// Span of the `src` attribute value in the full SFC source.
189    pub src_span: Option<Span>,
190    /// Whether this script is a Vue `<script setup>` block.
191    pub is_setup: bool,
192    /// Whether this script is a Svelte module-context block.
193    pub is_context_module: bool,
194    /// Type-parameter list from a `generic="..."` (Vue) or `generics="..."`
195    /// (Svelte) attribute on the script tag. Holds the bare constraint, no
196    /// surrounding angle brackets, e.g. `T extends Test<boolean>`.
197    pub generic_attr: Option<String>,
198}
199
200/// Extract all `<script>` blocks from a Vue/Svelte SFC source string.
201pub fn extract_sfc_scripts(source: &str) -> Vec<SfcScript> {
202    let comment_ranges: Vec<(usize, usize)> = HTML_COMMENT_RE
203        .find_iter(source)
204        .map(|m| (m.start(), m.end()))
205        .collect();
206
207    SCRIPT_BLOCK_RE
208        .captures_iter(source)
209        .filter(|cap| {
210            let start = cap.get(0).map_or(0, |m| m.start());
211            !comment_ranges
212                .iter()
213                .any(|&(cs, ce)| start >= cs && start < ce)
214        })
215        .map(|cap| {
216            let attrs = cap.name("attrs").map_or("", |m| m.as_str());
217            let body_match = cap.name("body");
218            let byte_offset = body_match.map_or(0, |m| m.start());
219            let body = body_match.map_or("", |m| m.as_str()).to_string();
220            let lang = LANG_ATTR_RE
221                .captures(attrs)
222                .and_then(|c| c.get(1))
223                .map(|m| m.as_str());
224            let is_typescript = matches!(lang, Some("ts" | "tsx"));
225            let is_jsx = matches!(lang, Some("tsx" | "jsx"));
226            let src = SRC_ATTR_RE
227                .captures(attrs)
228                .and_then(|c| c.get(1))
229                .map(|m| m.as_str().to_string());
230            let attrs_start = cap.name("attrs").map_or(0, |m| m.start());
231            let src_span = SRC_ATTR_RE.captures(attrs).and_then(|c| c.get(1)).map(|m| {
232                Span::new(
233                    (attrs_start + m.start()) as u32,
234                    (attrs_start + m.end()) as u32,
235                )
236            });
237            let is_setup = SETUP_ATTR_RE.is_match(attrs);
238            // Svelte module context: Svelte 4 `context="module"` OR Svelte 5's
239            // bare `module` attribute. Both scope declarations to the module
240            // script (not the instance), so `is_template_visible_script` returns
241            // false and the instance/module split for runes harvest is correct.
242            let is_context_module =
243                CONTEXT_MODULE_ATTR_RE.is_match(attrs) || SVELTE_MODULE_ATTR_RE.is_match(attrs);
244            let generic_attr = VUE_GENERIC_ATTR_RE
245                .captures(attrs)
246                .or_else(|| SVELTE_GENERICS_ATTR_RE.captures(attrs))
247                .and_then(|cap| cap.get(1).or_else(|| cap.get(2)))
248                .map(|m| m.as_str().to_string())
249                .filter(|value| !value.trim().is_empty());
250            SfcScript {
251                body,
252                is_typescript,
253                is_jsx,
254                byte_offset,
255                src,
256                src_span,
257                is_setup,
258                is_context_module,
259                generic_attr,
260            }
261        })
262        .collect()
263}
264
265/// An extracted `<style>` block from a Vue or Svelte SFC.
266pub struct SfcStyle {
267    /// The style body text (CSS / SCSS / Sass / Less / Stylus / PostCSS source).
268    pub body: String,
269    /// The `lang` attribute value (`scss`, `sass`, `less`, `stylus`, `postcss`, ...).
270    /// `None` for plain `<style>` (CSS).
271    pub lang: Option<String>,
272    /// External style source path from the `src` attribute (`<style src="./theme.scss">`).
273    pub src: Option<String>,
274    /// Span of the `src` attribute value in the full SFC source.
275    pub src_span: Option<Span>,
276    /// Byte offset of the style body within the full SFC source.
277    pub byte_offset: usize,
278}
279
280/// A source region extracted from a larger file while preserving the byte
281/// offset of the region body in the original source.
282pub struct SourceRegion {
283    /// Region body text.
284    pub body: String,
285    /// Byte offset of `body` within the original source.
286    pub byte_offset: usize,
287}
288
289/// Extract template markup regions from a Vue/Svelte SFC.
290///
291/// The returned regions exclude `<script>` blocks, `<style>` blocks, and HTML
292/// comments, so callers can tokenize authored markup without reading code or
293/// comments as template text. Offsets always point into the original SFC source.
294#[must_use]
295pub fn extract_sfc_template_regions(source: &str) -> Vec<SourceRegion> {
296    let mut ranges: Vec<(usize, usize)> = SCRIPT_BLOCK_RE
297        .find_iter(source)
298        .chain(STYLE_BLOCK_RE.find_iter(source))
299        .chain(HTML_COMMENT_RE.find_iter(source))
300        .map(|m| (m.start(), m.end()))
301        .collect();
302    ranges.sort_unstable_by_key(|(start, _)| *start);
303    ranges_to_gaps(source, &ranges)
304}
305
306/// Extract all `<style>` blocks from a Vue/Svelte SFC source string.
307///
308/// Mirrors [`extract_sfc_scripts`]: filters blocks inside HTML comments and
309/// captures the `lang` and `src` attributes so the caller can route the body to
310/// the right preprocessor's import scanner (currently only CSS / SCSS / Sass) or
311/// seed the `src` reference as a side-effect import.
312pub fn extract_sfc_styles(source: &str) -> Vec<SfcStyle> {
313    let comment_ranges: Vec<(usize, usize)> = HTML_COMMENT_RE
314        .find_iter(source)
315        .map(|m| (m.start(), m.end()))
316        .collect();
317
318    STYLE_BLOCK_RE
319        .captures_iter(source)
320        .filter(|cap| {
321            let start = cap.get(0).map_or(0, |m| m.start());
322            !comment_ranges
323                .iter()
324                .any(|&(cs, ce)| start >= cs && start < ce)
325        })
326        .map(|cap| {
327            let attrs = cap.name("attrs").map_or("", |m| m.as_str());
328            let body = cap.name("body").map_or("", |m| m.as_str()).to_string();
329            let byte_offset = cap.name("body").map_or(0, |m| m.start());
330            let lang = LANG_ATTR_RE
331                .captures(attrs)
332                .and_then(|c| c.get(1))
333                .map(|m| m.as_str().to_string());
334            let src = SRC_ATTR_RE
335                .captures(attrs)
336                .and_then(|c| c.get(1))
337                .map(|m| m.as_str().to_string());
338            let attrs_start = cap.name("attrs").map_or(0, |m| m.start());
339            let src_span = SRC_ATTR_RE.captures(attrs).and_then(|c| c.get(1)).map(|m| {
340                Span::new(
341                    (attrs_start + m.start()) as u32,
342                    (attrs_start + m.end()) as u32,
343                )
344            });
345            SfcStyle {
346                body,
347                lang,
348                src,
349                src_span,
350                byte_offset,
351            }
352        })
353        .collect()
354}
355
356fn ranges_to_gaps(source: &str, ranges: &[(usize, usize)]) -> Vec<SourceRegion> {
357    let mut regions = Vec::new();
358    let mut cursor = 0;
359    for &(start, end) in ranges {
360        if start > cursor {
361            push_region(source, cursor, start, &mut regions);
362        }
363        cursor = cursor.max(end);
364    }
365    if cursor < source.len() {
366        push_region(source, cursor, source.len(), &mut regions);
367    }
368    regions
369}
370
371fn push_region(source: &str, start: usize, end: usize, regions: &mut Vec<SourceRegion>) {
372    let Some(body) = source.get(start..end) else {
373        return;
374    };
375    if body.trim().is_empty() {
376        return;
377    }
378    regions.push(SourceRegion {
379        body: body.to_string(),
380        byte_offset: start,
381    });
382}
383
384/// Check if a file path is a Vue or Svelte SFC (`.vue` or `.svelte`).
385#[must_use]
386pub fn is_sfc_file(path: &Path) -> bool {
387    path.extension()
388        .and_then(|e| e.to_str())
389        .is_some_and(|ext| ext == "vue" || ext == "svelte")
390}
391
392/// Parse an SFC file by extracting and combining all `<script>` and `<style>` blocks.
393pub(crate) fn parse_sfc_to_module(
394    file_id: FileId,
395    path: &Path,
396    source: &str,
397    content_hash: u64,
398    need_complexity: bool,
399) -> ModuleInfo {
400    let scripts = extract_sfc_scripts(source);
401    let styles = extract_sfc_styles(source);
402    let kind = sfc_kind(path);
403    let mut combined = empty_sfc_module(file_id, source, content_hash);
404    let mut template_visible_imports: FxHashSet<String> = FxHashSet::default();
405    let mut template_visible_bound_targets: FxHashMap<String, String> = FxHashMap::default();
406    let mut props_return_binding: Option<String> = None;
407    let mut emit_return_binding: Option<String> = None;
408
409    for script in &scripts {
410        merge_script_into_module(&mut SfcScriptMergeInput {
411            kind,
412            script,
413            combined: &mut combined,
414            template_visible_imports: &mut template_visible_imports,
415            template_visible_bound_targets: &mut template_visible_bound_targets,
416            props_return_binding: &mut props_return_binding,
417            emit_return_binding: &mut emit_return_binding,
418            need_complexity,
419        });
420    }
421
422    for style in &styles {
423        merge_style_into_module(style, &mut combined);
424    }
425
426    // Whole-object prop/attr spread in the template (`v-bind="$attrs"`,
427    // `v-bind="$props"`, `v-bind="props"`) can consume a prop indirectly, so the
428    // `unused-component-prop` detector must abstain on the whole file.
429    if kind == SfcKind::Vue
430        && !combined.component_props.is_empty()
431        && PROPS_ATTRS_SPREAD_RE.is_match(source)
432    {
433        combined.has_props_attrs_fallthrough = true;
434    }
435
436    apply_template_usage(
437        kind,
438        source,
439        &template_visible_imports,
440        &template_visible_bound_targets,
441        props_return_binding.as_deref(),
442        kind == SfcKind::Svelte && is_sveltekit_route_data_component(path),
443        &mut combined,
444    );
445
446    // Synthetic per-SFC `<template>` complexity: count template control flow
447    // (`v-if`/`v-for`, `{#if}`/`{#each}`) and bound-expression/interpolation
448    // complexity so a template-heavy SFC is not scored as artificially simple.
449    // The scanners mask `<script>`/`<style>`/comments, so script control flow is
450    // NOT double-counted (it is scored by `translate_script_complexity` above).
451    // Mirrors Angular's `template_complexity` synthetic entry; no new rule or
452    // threshold, the entry folds into the existing complexity aggregate.
453    if need_complexity {
454        let template_complexity = match kind {
455            SfcKind::Vue => crate::template_complexity::compute_vue_template_complexity(source),
456            SfcKind::Svelte => {
457                crate::template_complexity::compute_svelte_template_complexity(source)
458            }
459        };
460        combined.complexity.extend(template_complexity);
461    }
462
463    // Credit `<emit_binding>('event')` / `$emit('event')` calls in the template
464    // (`@click="emit('close')"`), which the script-only emit usage walk cannot
465    // see. A dynamic template emit (`$emit(someVar)`) abstains the whole file.
466    if kind == SfcKind::Vue && !combined.component_emits.is_empty() {
467        apply_template_emit_usage(source, emit_return_binding.as_deref(), &mut combined);
468    }
469
470    // Harvest Svelte template `on:<name>` listener bindings on component tags
471    // into the per-file listened set; the `unused-svelte-event` detector unions
472    // these project-wide to decide which dispatched events are dead.
473    if kind == SfcKind::Svelte {
474        combined.svelte_listened_events =
475            crate::sfc_template::collect_svelte_listened_events(source);
476    }
477
478    // Static relative asset references in markup (`<img src="./logo.png">`)
479    // become SideEffect imports so a genuinely-missing asset surfaces as
480    // `unresolved-import` (existing assets resolve to `ExternalFile`, no finding).
481    for (specifier, span) in collect_template_asset_refs(source) {
482        combined.imports.push(ImportInfo {
483            source: specifier,
484            imported_name: ImportedName::SideEffect,
485            local_name: String::new(),
486            is_type_only: false,
487            from_style: false,
488            span,
489            source_span: span,
490        });
491    }
492
493    combined.unused_import_bindings.sort_unstable();
494    combined.unused_import_bindings.dedup();
495    combined.type_referenced_import_bindings.sort_unstable();
496    combined.type_referenced_import_bindings.dedup();
497    combined.value_referenced_import_bindings.sort_unstable();
498    combined.value_referenced_import_bindings.dedup();
499    combined.auto_import_candidates.sort_unstable();
500    combined.auto_import_candidates.dedup();
501
502    combined
503}
504
505fn sfc_kind(path: &Path) -> SfcKind {
506    if path.extension().and_then(|ext| ext.to_str()) == Some("vue") {
507        SfcKind::Vue
508    } else {
509        SfcKind::Svelte
510    }
511}
512
513/// SvelteKit route components receive a `data` prop populated by the route's
514/// `load()` return object. This predicate gates the `data`-as-template-root
515/// credit (unused-load-data-key Primitive B) to exactly those files. It matches
516/// `+page.svelte` / `+layout.svelte` AND their layout-reset variants
517/// (`+page@.svelte`, `+page@named.svelte`, `+page@(group).svelte`, and the
518/// `+layout@...` forms), all of which still receive the `data` prop. `+error.svelte`
519/// is excluded (it receives `$page.error`, not the `load()` `data` prop), and a
520/// non-route file like `+pageHelper.svelte` is excluded by the grammar (the part
521/// after `+page` must be empty or start with `@`). The leading `+` is a
522/// SvelteKit-only filename convention, so no ordinary `.svelte` component matches.
523fn is_sveltekit_route_data_component(path: &Path) -> bool {
524    let Some(stem) = path
525        .file_name()
526        .and_then(|name| name.to_str())
527        .and_then(|name| name.strip_suffix(".svelte"))
528    else {
529        return false;
530    };
531    ["+page", "+layout"].iter().any(|prefix| {
532        stem.strip_prefix(prefix)
533            .is_some_and(|rest| rest.is_empty() || rest.starts_with('@'))
534    })
535}
536
537fn empty_sfc_module(file_id: FileId, source: &str, content_hash: u64) -> ModuleInfo {
538    let parsed = crate::suppress::parse_suppressions_from_source(source);
539
540    ModuleInfo {
541        file_id,
542        exports: Vec::new(),
543        imports: Vec::new(),
544        re_exports: Vec::new(),
545        dynamic_imports: Vec::new(),
546        dynamic_import_patterns: Vec::new(),
547        require_calls: Vec::new(),
548        package_path_references: Vec::new(),
549        member_accesses: Vec::new(),
550        whole_object_uses: Vec::new(),
551        has_cjs_exports: false,
552        has_angular_component_template_url: false,
553        content_hash,
554        suppressions: parsed.suppressions,
555        unknown_suppression_kinds: parsed.unknown_kinds,
556        unused_import_bindings: Vec::new(),
557        type_referenced_import_bindings: Vec::new(),
558        value_referenced_import_bindings: Vec::new(),
559        line_offsets: compute_line_offsets(source),
560        complexity: Vec::new(),
561        flag_uses: Vec::new(),
562        class_heritage: vec![],
563        injection_tokens: vec![],
564        local_type_declarations: Vec::new(),
565        public_signature_type_references: Vec::new(),
566        namespace_object_aliases: Vec::new(),
567        iconify_prefixes: Vec::new(),
568        iconify_icon_names: Vec::new(),
569        auto_import_candidates: Vec::new(),
570        directives: Vec::new(),
571        client_only_dynamic_import_spans: Vec::new(),
572        security_sinks: Vec::new(),
573        security_sinks_skipped: 0,
574        security_unresolved_callee_sites: Vec::new(),
575        tainted_bindings: Vec::new(),
576        sanitized_sink_args: Vec::new(),
577        security_control_sites: Vec::new(),
578        callee_uses: Vec::new(),
579        misplaced_directives: Vec::new(),
580        inline_server_action_exports: Vec::new(),
581        di_key_sites: Vec::new(),
582        has_dynamic_provide: false,
583        referenced_import_bindings: Vec::new(),
584        component_props: Vec::new(),
585        has_props_attrs_fallthrough: false,
586        has_define_expose: false,
587        has_define_model: false,
588        has_unharvestable_props: false,
589        component_emits: Vec::new(),
590        angular_inputs: Vec::new(),
591        angular_outputs: Vec::new(),
592        angular_component_selectors: Vec::new(),
593        angular_used_selectors: Vec::new(),
594        angular_entry_component_refs: Vec::new(),
595        has_dynamic_component_render: false,
596        has_unharvestable_emits: false,
597        has_dynamic_emit: false,
598        has_emit_whole_object_use: false,
599        load_return_keys: Vec::new(),
600        has_unharvestable_load: false,
601        has_load_data_whole_use: false,
602        has_page_data_store_whole_use: false,
603        component_functions: Vec::new(),
604        react_props: Vec::new(),
605        hook_uses: Vec::new(),
606        render_edges: Vec::new(),
607        svelte_dispatched_events: Vec::new(),
608        svelte_listened_events: Vec::new(),
609        has_dynamic_dispatch: false,
610    }
611}
612
613struct SfcScriptMergeInput<'a> {
614    kind: SfcKind,
615    script: &'a SfcScript,
616    combined: &'a mut ModuleInfo,
617    template_visible_imports: &'a mut FxHashSet<String>,
618    template_visible_bound_targets: &'a mut FxHashMap<String, String>,
619    props_return_binding: &'a mut Option<String>,
620    emit_return_binding: &'a mut Option<String>,
621    need_complexity: bool,
622}
623
624fn merge_script_into_module(input: &mut SfcScriptMergeInput<'_>) {
625    if input.kind == SfcKind::Vue
626        && let Some(src) = &input.script.src
627    {
628        add_script_src_import(input.combined, src, input.script.src_span);
629    }
630
631    let allocator = Allocator::default();
632    let parser_return = Parser::new(
633        &allocator,
634        &input.script.body,
635        source_type_for_script(input.script),
636    )
637    .parse();
638    let mut extractor = ModuleInfoExtractor::new();
639    extractor.visit_program(&parser_return.program);
640    let extraction = ExtractionResult::contiguous(&input.script.body, input.script.byte_offset);
641    extractor.remap_spans_with(|span| extraction.remap_span(span));
642    extractor.resolve_typed_destructure_bindings();
643
644    let augmented_body = build_generic_attr_probe_source(input.script);
645    let empty_template_used = rustc_hash::FxHashSet::default();
646    let (binding_usage, auto_import_candidates) = if let Some(augmented) = augmented_body.as_deref()
647    {
648        let augmented_return =
649            Parser::new(&allocator, augmented, source_type_for_script(input.script)).parse();
650        (
651            compute_import_binding_usage(
652                &augmented_return.program,
653                &extractor.imports,
654                &empty_template_used,
655            ),
656            compute_auto_import_candidates(&parser_return.program),
657        )
658    } else {
659        let semantic_usage = compute_semantic_usage(
660            &parser_return.program,
661            &extractor.imports,
662            &empty_template_used,
663        );
664        (
665            semantic_usage.import_binding_usage,
666            semantic_usage.auto_import_candidates,
667        )
668    };
669    input
670        .combined
671        .unused_import_bindings
672        .extend(binding_usage.unused.iter().cloned());
673    input
674        .combined
675        .type_referenced_import_bindings
676        .extend(binding_usage.type_referenced.iter().cloned());
677    input
678        .combined
679        .value_referenced_import_bindings
680        .extend(binding_usage.value_referenced.iter().cloned());
681    input
682        .combined
683        .auto_import_candidates
684        .extend(auto_import_candidates);
685    if input.need_complexity {
686        input
687            .combined
688            .complexity
689            .extend(translate_script_complexity(
690                input.script,
691                &parser_return.program,
692                &input.combined.line_offsets,
693            ));
694    }
695
696    // Vue prop/emit harvesting (`<script setup>` macros + Options API) for the
697    // `unused-component-prop` / `unused-component-emit` detectors. Extracted to a
698    // helper to keep this function under the unit-size lint.
699    if input.kind == SfcKind::Vue {
700        merge_vue_props_emits_into(input, &parser_return.program);
701    }
702
703    // Svelte 5 `$props()` rune harvesting for `unused-component-prop`. `$props`
704    // is an instance-only rune, so harvest ONLY the template-visible instance
705    // script, never the module script (`<script context="module">` /
706    // `<script module>`).
707    if input.kind == SfcKind::Svelte && is_template_visible_script(input.kind, input.script) {
708        merge_svelte_props_into(
709            input.combined,
710            &parser_return.program,
711            input.script.byte_offset,
712        );
713    }
714
715    if is_template_visible_script(input.kind, input.script) {
716        input.template_visible_imports.extend(
717            extractor
718                .imports
719                .iter()
720                .filter(|import| !import.local_name.is_empty())
721                .map(|import| import.local_name.clone()),
722        );
723        input.template_visible_bound_targets.extend(
724            extractor
725                .binding_target_names()
726                .iter()
727                .filter(|(local, _)| !local.starts_with("this."))
728                .map(|(local, target)| (local.clone(), target.clone())),
729        );
730    }
731
732    // Dispatched events recorded by the visitor carry body-relative spans, like
733    // props/emits above. Remap the entries this script contributes onto the SFC
734    // source via the script byte offset so the finding line/col points at the
735    // real `dispatch(...)` call, not a body-relative position.
736    let dispatch_base = input.combined.svelte_dispatched_events.len();
737    extractor.merge_into(input.combined);
738    for event in &mut input.combined.svelte_dispatched_events[dispatch_base..] {
739        event.span_start += input.script.byte_offset as u32;
740    }
741}
742
743/// Harvest Svelte 5 `$props()` declared props from an instance `<script>`
744/// program into `combined.component_props` (reusing the Vue IR + abstain flags),
745/// remapping each prop's body-relative span onto the SFC source via `byte_offset`.
746fn merge_svelte_props_into(
747    combined: &mut ModuleInfo,
748    program: &oxc_ast::ast::Program<'_>,
749    byte_offset: usize,
750) {
751    let harvest = crate::sfc_props::harvest_svelte_props(program);
752    if harvest.has_unharvestable_props {
753        combined.has_unharvestable_props = true;
754    }
755    if harvest.has_props_attrs_fallthrough {
756        combined.has_props_attrs_fallthrough = true;
757    }
758    for mut prop in harvest.props {
759        prop.span_start += byte_offset as u32;
760        combined.component_props.push(prop);
761    }
762}
763
764/// Harvest Vue prop/emit declarations into `combined`, remapping body-relative
765/// spans onto the SFC source via the script byte offset. The `<script setup>`
766/// path harvests `defineProps` / `defineEmits` (and the `defineExpose` /
767/// `defineModel` abstain flags + return bindings); the non-setup path harvests
768/// the Options API `props:` / `emits:` (same IR, same abstain flags, same remap,
769/// only the harvest source differs).
770fn merge_vue_props_emits_into(
771    input: &mut SfcScriptMergeInput<'_>,
772    program: &oxc_ast::ast::Program<'_>,
773) {
774    let byte_offset = input.script.byte_offset as u32;
775    if input.script.is_setup {
776        let harvest = crate::sfc_props::harvest_define_props(program);
777        if harvest.has_unharvestable_props {
778            input.combined.has_unharvestable_props = true;
779        }
780        if harvest.has_props_attrs_fallthrough {
781            input.combined.has_props_attrs_fallthrough = true;
782        }
783        if harvest.has_define_expose {
784            input.combined.has_define_expose = true;
785        }
786        if harvest.has_define_model {
787            input.combined.has_define_model = true;
788        }
789        if let Some(binding) = harvest.props_return_binding {
790            *input.props_return_binding = Some(binding);
791        }
792        for mut prop in harvest.props {
793            prop.span_start += byte_offset;
794            input.combined.component_props.push(prop);
795        }
796
797        let emit_harvest = crate::sfc_props::harvest_define_emits(program);
798        if emit_harvest.has_unharvestable_emits {
799            input.combined.has_unharvestable_emits = true;
800        }
801        if emit_harvest.has_dynamic_emit {
802            input.combined.has_dynamic_emit = true;
803        }
804        if emit_harvest.has_emit_whole_object_use {
805            input.combined.has_emit_whole_object_use = true;
806        }
807        if let Some(binding) = emit_harvest.emit_binding {
808            *input.emit_return_binding = Some(binding);
809        }
810        for mut emit in emit_harvest.emits {
811            emit.span_start += byte_offset;
812            input.combined.component_emits.push(emit);
813        }
814    } else {
815        let harvest = crate::sfc_props::harvest_options_api_props(program);
816        if harvest.has_unharvestable_props {
817            input.combined.has_unharvestable_props = true;
818        }
819        if harvest.has_props_attrs_fallthrough {
820            input.combined.has_props_attrs_fallthrough = true;
821        }
822        for mut prop in harvest.props {
823            prop.span_start += byte_offset;
824            input.combined.component_props.push(prop);
825        }
826
827        let emit_harvest = crate::sfc_props::harvest_options_api_emits(program);
828        if emit_harvest.has_unharvestable_emits {
829            input.combined.has_unharvestable_emits = true;
830        }
831        if emit_harvest.has_dynamic_emit {
832            input.combined.has_dynamic_emit = true;
833        }
834        for mut emit in emit_harvest.emits {
835            emit.span_start += byte_offset;
836            input.combined.component_emits.push(emit);
837        }
838    }
839}
840
841fn translate_script_complexity(
842    script: &SfcScript,
843    program: &oxc_ast::ast::Program<'_>,
844    sfc_line_offsets: &[u32],
845) -> Vec<FunctionComplexity> {
846    let script_line_offsets = compute_line_offsets(&script.body);
847    let mut complexity =
848        crate::complexity::compute_complexity(program, &script.body, &script_line_offsets);
849    let (body_start_line, body_start_col) =
850        byte_offset_to_line_col(sfc_line_offsets, script.byte_offset as u32);
851
852    for function in &mut complexity {
853        function.line = body_start_line + function.line.saturating_sub(1);
854        if function.line == body_start_line {
855            function.col += body_start_col;
856        }
857    }
858
859    complexity
860}
861
862fn add_script_src_import(module: &mut ModuleInfo, source: &str, source_span: Option<Span>) {
863    let span = source_span.unwrap_or_default();
864    module.imports.push(ImportInfo {
865        source: normalize_asset_url(source),
866        imported_name: ImportedName::SideEffect,
867        local_name: String::new(),
868        is_type_only: false,
869        from_style: false,
870        span,
871        source_span: span,
872    });
873}
874
875/// `lang` attribute values whose body we know how to scan for `@import` /
876/// `@use` / `@forward` / `@plugin` directives. Plain `<style>` (no `lang`) is treated as
877/// CSS. `less`, `stylus`, and `postcss` bodies are NOT scanned because their
878/// import syntax differs (`@import (reference)` modifiers, etc.); their
879/// `<style src="...">` references are still seeded.
880fn style_lang_is_scss(lang: Option<&str>) -> bool {
881    matches!(lang, Some("scss" | "sass"))
882}
883
884fn style_lang_is_css_like(lang: Option<&str>) -> bool {
885    lang.is_none() || matches!(lang, Some("css"))
886}
887
888fn merge_style_into_module(style: &SfcStyle, combined: &mut ModuleInfo) {
889    if let Some(src) = &style.src {
890        let span = style.src_span.unwrap_or_default();
891        combined.imports.push(ImportInfo {
892            source: normalize_asset_url(src),
893            imported_name: ImportedName::SideEffect,
894            local_name: String::new(),
895            is_type_only: false,
896            from_style: true,
897            span,
898            source_span: span,
899        });
900    }
901
902    let lang = style.lang.as_deref();
903    let is_scss = style_lang_is_scss(lang);
904    let is_css_like = style_lang_is_css_like(lang);
905    if !is_scss && !is_css_like {
906        return;
907    }
908
909    for source in crate::css::extract_css_import_sources(&style.body, is_scss) {
910        let source_span = Span::new(
911            style.byte_offset as u32 + source.span.start,
912            style.byte_offset as u32 + source.span.end,
913        );
914        combined.imports.push(ImportInfo {
915            source: source.normalized,
916            imported_name: if source.is_plugin {
917                ImportedName::Default
918            } else {
919                ImportedName::SideEffect
920            },
921            local_name: String::new(),
922            is_type_only: false,
923            from_style: true,
924            span: source_span,
925            source_span,
926        });
927    }
928}
929
930fn source_type_for_script(script: &SfcScript) -> SourceType {
931    match (script.is_typescript, script.is_jsx) {
932        (true, true) => SourceType::tsx(),
933        (true, false) => SourceType::ts(),
934        (false, true) => SourceType::jsx(),
935        (false, false) => SourceType::mjs(),
936    }
937}
938
939/// Build an augmented script body that pins the `generic="..."` constraint as
940/// a synthetic local type alias. The alias is unexported and uses a sentinel
941/// name so it can't collide with user code. Returns `None` when there is no
942/// generic attribute to pin (the common case), so callers fall back to the
943/// raw body without paying for a second parse.
944fn build_generic_attr_probe_source(script: &SfcScript) -> Option<String> {
945    let constraint = script.generic_attr.as_deref()?.trim();
946    if constraint.is_empty() {
947        return None;
948    }
949    Some(format!(
950        "{}\n;type __FALLOW_GENERIC_ATTR_PROBE<{}> = unknown;\n",
951        script.body, constraint,
952    ))
953}
954
955fn apply_template_usage(
956    kind: SfcKind,
957    source: &str,
958    template_visible_imports: &FxHashSet<String>,
959    template_visible_bound_targets: &FxHashMap<String, String>,
960    props_return_binding: Option<&str>,
961    credit_load_data: bool,
962    combined: &mut ModuleInfo,
963) {
964    // Props are NOT imports, so the template scanner does not credit them by
965    // default. Thread the harvested prop names (and the `defineProps` return
966    // binding, so `props.<name>` template member accesses are emitted) in as an
967    // additional credited set alongside `template_visible_imports`. Crediting a
968    // prop name against an import is inert (no import binding shares the name),
969    // so the unused-import retain is unaffected.
970    let mut credited: FxHashSet<String> = template_visible_imports.clone();
971    // unused-load-data-key Primitive B: a SvelteKit route component
972    // (`+page.svelte` / `+layout.svelte`) receives a `data` prop populated by
973    // the route's `load()` return object. The prop is template-visible
974    // (`{data.x}`, `{#each data.items as i}`) but is neither an import nor a
975    // tracked binding, so the member-access scanner gates it out by default.
976    // Credit `data` as a recognized root so its template member accesses
977    // (`data.<key>`) are emitted for the cross-file load-data-key join. Gated to
978    // route components only (`credit_load_data`): a non-route component's
979    // `let { data } = $props()` is a different, parent-passed `data`, so
980    // crediting it as load data would be semantically wrong. Inert for every
981    // other detector unless a tracked export/instance is named `data` (mirrors
982    // Primitive A); the load-data-key join is the only consumer of `data.<key>`.
983    if credit_load_data {
984        credited.insert("data".to_string());
985        // FP-1: a route component spreading / passing the whole `data` prop in
986        // markup consumes arbitrary keys opaquely; force the detector to abstain
987        // on this route. A false abstain only suppresses findings, never creates
988        // one, so matching the full source (script + template) is safe.
989        if SVELTE_TEMPLATE_DATA_WHOLE_USE_RE.is_match(source) {
990            combined.has_load_data_whole_use = true;
991        }
992    }
993    if !combined.component_props.is_empty() {
994        for prop in &combined.component_props {
995            // Credit both the declared name (Vue exposes props by name in the
996            // template) and the destructure local (a renamed prop is used via it).
997            credited.insert(prop.name.clone());
998            credited.insert(prop.local.clone());
999        }
1000        // Vue's implicit `$props` whole-props object is always available in a
1001        // template; credit `$props.<name>` member accesses too.
1002        credited.insert("$props".to_string());
1003        if let Some(binding) = props_return_binding {
1004            credited.insert(binding.to_string());
1005        }
1006    }
1007
1008    // unused-load-data-key Primitive B: a route `data` prop is usually typed as
1009    // SvelteKit's generated `PageData` / `LayoutData` (`export let data:
1010    // PageData`). That typed binding (`data -> PageData`) would otherwise make the
1011    // template scanner remap `{data.x}` / `<Child foo={data.x} />` member accesses
1012    // onto the generated type (`PageData.x`), dropping the `data`-keyed access the
1013    // cross-file load-data join needs. Drop `data` from the bound-targets for the
1014    // template scan so its template member accesses stay keyed on `data`. The
1015    // generated `$types` aliases carry no real members for any member detector, so
1016    // losing the type-keyed template credit is inert; script-side `data` reads are
1017    // unaffected (their resolution already ran during `merge_into`).
1018    let template_usage = if credit_load_data && template_visible_bound_targets.contains_key("data")
1019    {
1020        let mut filtered = template_visible_bound_targets.clone();
1021        filtered.remove("data");
1022        collect_template_usage_with_bound_targets(kind, source, &credited, &filtered)
1023    } else {
1024        collect_template_usage_with_bound_targets(
1025            kind,
1026            source,
1027            &credited,
1028            template_visible_bound_targets,
1029        )
1030    };
1031
1032    // A template reference credits `used_in_template`: either a bare prop name in
1033    // `used_bindings` (destructured prop form, or template uses the bare name) OR
1034    // a `<props>.<name>` / `$props.<name>` member access (the
1035    // `const props = defineProps()` form and Vue's implicit `$props`).
1036    if !combined.component_props.is_empty() {
1037        let member_used: FxHashSet<&str> = template_usage
1038            .member_accesses
1039            .iter()
1040            .filter(|access| {
1041                access.object == "$props"
1042                    || props_return_binding.is_some_and(|binding| access.object == binding)
1043            })
1044            .map(|access| access.member.as_str())
1045            .collect();
1046        for prop in &mut combined.component_props {
1047            if template_usage.used_bindings.contains(&prop.name)
1048                || template_usage.used_bindings.contains(&prop.local)
1049                || member_used.contains(prop.name.as_str())
1050            {
1051                prop.used_in_template = true;
1052            }
1053        }
1054    }
1055
1056    // A custom-named `defineProps` return spread as a whole object in the template
1057    // (`const myProps = defineProps(); <Child v-bind="myProps" />`) consumes every
1058    // prop opaquely; the literal `props`/`$props`/`$attrs` regex misses a custom
1059    // name. The scanner records a bare `v-bind="myProps"` value as a used binding
1060    // (not a whole-object use), so a bare reference to the return binding in either
1061    // set means abstain on the whole file.
1062    if let Some(binding) = props_return_binding
1063        && (template_usage.used_bindings.contains(binding)
1064            || template_usage
1065                .whole_object_uses
1066                .iter()
1067                .any(|used| used == binding))
1068    {
1069        combined.has_props_attrs_fallthrough = true;
1070    }
1071
1072    combined
1073        .unused_import_bindings
1074        .retain(|binding| !template_usage.used_bindings.contains(binding));
1075    combined
1076        .member_accesses
1077        .extend(template_usage.member_accesses);
1078    combined
1079        .whole_object_uses
1080        .extend(template_usage.whole_object_uses);
1081    combined
1082        .security_sinks
1083        .extend(template_usage.security_sinks);
1084    if !template_usage.unresolved_tag_names.is_empty() {
1085        let mut names: Vec<String> = template_usage.unresolved_tag_names.into_iter().collect();
1086        names.sort_unstable();
1087        combined.auto_import_candidates.extend(names);
1088        combined.auto_import_candidates.dedup();
1089    }
1090}
1091
1092/// Credit emit events fired from the `<template>` (`@click="emit('close')"`,
1093/// `@click="$emit('remove')"`, `:close="{ onClick: () => emit('close') }"`),
1094/// which the script-only emit usage walk in `harvest_define_emits` cannot see.
1095///
1096/// Scans the template-only region (scripts/styles/comments masked) for
1097/// [`TEMPLATE_EMIT_CALL_RE`]: a call whose callee is the harvested emit binding
1098/// (`emit` / `emits` / whatever it was bound to) or the implicit `$emit` (always
1099/// available in a Vue template regardless of `<script setup>` binding). A
1100/// string-literal first arg credits the matching `ComponentEmit` as used; a
1101/// non-literal first arg (a variable / template-literal) is a dynamic template
1102/// emit whose event is unknowable, so the whole file abstains (`has_dynamic_emit`)
1103/// to preserve the zero-FP doctrine.
1104///
1105/// Over-crediting is the safe direction (it only suppresses a finding), so a
1106/// liberal raw-source scan is intentional here. The scan is byte-safe: the regex
1107/// runs over the `&str` template and only reads captured-group text, never
1108/// slicing at arbitrary byte offsets.
1109fn apply_template_emit_usage(
1110    source: &str,
1111    emit_return_binding: Option<&str>,
1112    combined: &mut ModuleInfo,
1113) {
1114    let masked = mask_non_markup_regions(source);
1115    let mut used: FxHashSet<String> = FxHashSet::default();
1116    let mut dynamic = false;
1117
1118    for caps in TEMPLATE_EMIT_CALL_RE.captures_iter(&masked) {
1119        let Some(callee) = caps.get(1) else {
1120            continue;
1121        };
1122        let callee = callee.as_str();
1123        let is_emit_call =
1124            callee == "$emit" || emit_return_binding.is_some_and(|binding| callee == binding);
1125        if !is_emit_call {
1126            continue;
1127        }
1128        if let Some(event) = caps.get(2).or_else(|| caps.get(3)) {
1129            // String-literal first arg (single- or double-quoted): the event
1130            // name. Credit it as used.
1131            used.insert(event.as_str().to_string());
1132        } else if caps.get(4).is_some() {
1133            // Non-literal first arg (`$emit(someVar)`, `emit(\`x\`)`): the event
1134            // cannot be known. Abstain on the whole file.
1135            dynamic = true;
1136        }
1137    }
1138
1139    if dynamic {
1140        combined.has_dynamic_emit = true;
1141    }
1142    if !used.is_empty() {
1143        for emit in &mut combined.component_emits {
1144            if used.contains(&emit.name) {
1145                emit.used = true;
1146            }
1147        }
1148    }
1149}
1150
1151fn is_template_visible_script(kind: SfcKind, script: &SfcScript) -> bool {
1152    match kind {
1153        SfcKind::Vue => script.is_setup,
1154        SfcKind::Svelte => !script.is_context_module,
1155    }
1156}
1157
1158#[cfg(all(test, not(miri)))]
1159mod tests {
1160    use super::*;
1161
1162    #[test]
1163    fn is_sfc_file_vue() {
1164        assert!(is_sfc_file(Path::new("App.vue")));
1165    }
1166
1167    #[test]
1168    fn is_sfc_file_svelte() {
1169        assert!(is_sfc_file(Path::new("Counter.svelte")));
1170    }
1171
1172    #[test]
1173    fn is_sfc_file_rejects_ts() {
1174        assert!(!is_sfc_file(Path::new("utils.ts")));
1175    }
1176
1177    #[test]
1178    fn is_sfc_file_rejects_jsx() {
1179        assert!(!is_sfc_file(Path::new("App.jsx")));
1180    }
1181
1182    #[test]
1183    fn is_sfc_file_rejects_astro() {
1184        assert!(!is_sfc_file(Path::new("Layout.astro")));
1185    }
1186
1187    #[test]
1188    fn single_plain_script() {
1189        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
1190        assert_eq!(scripts.len(), 1);
1191        assert_eq!(scripts[0].body, "const x = 1;");
1192        assert!(!scripts[0].is_typescript);
1193        assert!(!scripts[0].is_jsx);
1194        assert!(scripts[0].src.is_none());
1195    }
1196
1197    #[test]
1198    fn single_ts_script() {
1199        let scripts = extract_sfc_scripts(r#"<script lang="ts">const x: number = 1;</script>"#);
1200        assert_eq!(scripts.len(), 1);
1201        assert!(scripts[0].is_typescript);
1202        assert!(!scripts[0].is_jsx);
1203    }
1204
1205    #[test]
1206    fn single_tsx_script() {
1207        let scripts = extract_sfc_scripts(r#"<script lang="tsx">const el = <div />;</script>"#);
1208        assert_eq!(scripts.len(), 1);
1209        assert!(scripts[0].is_typescript);
1210        assert!(scripts[0].is_jsx);
1211    }
1212
1213    #[test]
1214    fn single_jsx_script() {
1215        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
1216        assert_eq!(scripts.len(), 1);
1217        assert!(!scripts[0].is_typescript);
1218        assert!(scripts[0].is_jsx);
1219    }
1220
1221    #[test]
1222    fn two_script_blocks() {
1223        let source = r#"
1224<script lang="ts">
1225export default {};
1226</script>
1227<script setup lang="ts">
1228const count = 0;
1229</script>
1230"#;
1231        let scripts = extract_sfc_scripts(source);
1232        assert_eq!(scripts.len(), 2);
1233        assert!(scripts[0].body.contains("export default"));
1234        assert!(scripts[1].body.contains("count"));
1235    }
1236
1237    #[test]
1238    fn script_setup_extracted() {
1239        let scripts =
1240            extract_sfc_scripts(r#"<script setup lang="ts">import { ref } from 'vue';</script>"#);
1241        assert_eq!(scripts.len(), 1);
1242        assert!(scripts[0].body.contains("import"));
1243        assert!(scripts[0].is_typescript);
1244    }
1245
1246    #[test]
1247    fn script_src_detected() {
1248        let scripts = extract_sfc_scripts(r#"<script src="./component.ts" lang="ts"></script>"#);
1249        assert_eq!(scripts.len(), 1);
1250        assert_eq!(scripts[0].src.as_deref(), Some("./component.ts"));
1251    }
1252
1253    // -- Svelte module-context recognition (W1.1 piece 1) ----------------------
1254
1255    #[test]
1256    fn svelte4_context_module_is_module_context() {
1257        let scripts =
1258            extract_sfc_scripts(r#"<script context="module">export const x = 1;</script>"#);
1259        assert_eq!(scripts.len(), 1);
1260        assert!(scripts[0].is_context_module);
1261    }
1262
1263    #[test]
1264    fn svelte5_bare_module_attr_is_module_context() {
1265        let scripts = extract_sfc_scripts(r"<script module>export const x = 1;</script>");
1266        assert_eq!(scripts.len(), 1);
1267        assert!(scripts[0].is_context_module);
1268    }
1269
1270    #[test]
1271    fn svelte5_module_with_lang_is_module_context() {
1272        let scripts =
1273            extract_sfc_scripts(r#"<script module lang="ts">export const x = 1;</script>"#);
1274        assert_eq!(scripts.len(), 1);
1275        assert!(scripts[0].is_context_module);
1276        assert!(scripts[0].is_typescript);
1277    }
1278
1279    #[test]
1280    fn plain_script_is_not_module_context() {
1281        let scripts = extract_sfc_scripts(r"<script>const x = 1;</script>");
1282        assert_eq!(scripts.len(), 1);
1283        assert!(!scripts[0].is_context_module);
1284    }
1285
1286    #[test]
1287    fn lang_ts_script_is_not_module_context() {
1288        let scripts = extract_sfc_scripts(r#"<script lang="ts">const x = 1;</script>"#);
1289        assert_eq!(scripts.len(), 1);
1290        assert!(!scripts[0].is_context_module);
1291    }
1292
1293    #[test]
1294    fn data_module_attr_is_not_module_context() {
1295        // The `(?:^|\s)module(?:\s|$|=)` anchor must not match `data-module`.
1296        let scripts =
1297            extract_sfc_scripts(r#"<script data-module="x" lang="ts">const x = 1;</script>"#);
1298        assert_eq!(scripts.len(), 1);
1299        assert!(!scripts[0].is_context_module);
1300    }
1301
1302    #[test]
1303    fn bare_module_script_is_not_template_visible() {
1304        // AC-2: a bare `<script module>` is scoped as module context, so its
1305        // imports are NOT credited as template-visible (matching `context="module"`).
1306        let module_script = SfcScript {
1307            body: String::new(),
1308            is_typescript: false,
1309            is_jsx: false,
1310            byte_offset: 0,
1311            src: None,
1312            src_span: None,
1313            is_setup: false,
1314            is_context_module: true,
1315            generic_attr: None,
1316        };
1317        assert!(!is_template_visible_script(SfcKind::Svelte, &module_script));
1318        let instance_script = SfcScript {
1319            is_context_module: false,
1320            ..module_script
1321        };
1322        assert!(is_template_visible_script(
1323            SfcKind::Svelte,
1324            &instance_script
1325        ));
1326    }
1327
1328    #[test]
1329    fn data_src_not_treated_as_src() {
1330        let scripts =
1331            extract_sfc_scripts(r#"<script lang="ts" data-src="./nope.ts">const x = 1;</script>"#);
1332        assert_eq!(scripts.len(), 1);
1333        assert!(scripts[0].src.is_none());
1334    }
1335
1336    #[test]
1337    fn script_inside_html_comment_filtered() {
1338        let source = r#"
1339<!-- <script lang="ts">import { bad } from 'bad';</script> -->
1340<script lang="ts">import { good } from 'good';</script>
1341"#;
1342        let scripts = extract_sfc_scripts(source);
1343        assert_eq!(scripts.len(), 1);
1344        assert!(scripts[0].body.contains("good"));
1345    }
1346
1347    #[test]
1348    fn spanning_comment_filters_script() {
1349        let source = r#"
1350<!-- disabled:
1351<script lang="ts">import { bad } from 'bad';</script>
1352-->
1353<script lang="ts">const ok = true;</script>
1354"#;
1355        let scripts = extract_sfc_scripts(source);
1356        assert_eq!(scripts.len(), 1);
1357        assert!(scripts[0].body.contains("ok"));
1358    }
1359
1360    #[test]
1361    fn string_containing_comment_markers_not_corrupted() {
1362        let source = r#"
1363<script setup lang="ts">
1364const marker = "<!-- not a comment -->";
1365import { ref } from 'vue';
1366</script>
1367"#;
1368        let scripts = extract_sfc_scripts(source);
1369        assert_eq!(scripts.len(), 1);
1370        assert!(scripts[0].body.contains("import"));
1371    }
1372
1373    #[test]
1374    fn generic_attr_with_angle_bracket() {
1375        let source =
1376            r#"<script setup lang="ts" generic="T extends Foo<Bar>">const x = 1;</script>"#;
1377        let scripts = extract_sfc_scripts(source);
1378        assert_eq!(scripts.len(), 1);
1379        assert_eq!(scripts[0].body, "const x = 1;");
1380    }
1381
1382    #[test]
1383    fn nested_generic_attr() {
1384        let source = r#"<script setup lang="ts" generic="T extends Map<string, Set<number>>">const x = 1;</script>"#;
1385        let scripts = extract_sfc_scripts(source);
1386        assert_eq!(scripts.len(), 1);
1387        assert_eq!(scripts[0].body, "const x = 1;");
1388    }
1389
1390    #[test]
1391    fn lang_single_quoted() {
1392        let scripts = extract_sfc_scripts("<script lang='ts'>const x = 1;</script>");
1393        assert_eq!(scripts.len(), 1);
1394        assert!(scripts[0].is_typescript);
1395    }
1396
1397    #[test]
1398    fn uppercase_script_tag() {
1399        let scripts = extract_sfc_scripts(r#"<SCRIPT lang="ts">const x = 1;</SCRIPT>"#);
1400        assert_eq!(scripts.len(), 1);
1401        assert!(scripts[0].is_typescript);
1402    }
1403
1404    #[test]
1405    fn no_script_block() {
1406        let scripts = extract_sfc_scripts("<template><div>Hello</div></template>");
1407        assert!(scripts.is_empty());
1408    }
1409
1410    #[test]
1411    fn empty_script_body() {
1412        let scripts = extract_sfc_scripts(r#"<script lang="ts"></script>"#);
1413        assert_eq!(scripts.len(), 1);
1414        assert!(scripts[0].body.is_empty());
1415    }
1416
1417    #[test]
1418    fn whitespace_only_script() {
1419        let scripts = extract_sfc_scripts("<script lang=\"ts\">\n  \n</script>");
1420        assert_eq!(scripts.len(), 1);
1421        assert!(scripts[0].body.trim().is_empty());
1422    }
1423
1424    #[test]
1425    fn byte_offset_is_set() {
1426        let source = r#"<template><div/></template><script lang="ts">code</script>"#;
1427        let scripts = extract_sfc_scripts(source);
1428        assert_eq!(scripts.len(), 1);
1429        let offset = scripts[0].byte_offset;
1430        assert_eq!(&source[offset..offset + 4], "code");
1431    }
1432
1433    #[test]
1434    fn script_with_extra_attributes() {
1435        let scripts = extract_sfc_scripts(
1436            r#"<script lang="ts" id="app" type="module" data-custom="val">const x = 1;</script>"#,
1437        );
1438        assert_eq!(scripts.len(), 1);
1439        assert!(scripts[0].is_typescript);
1440        assert!(scripts[0].src.is_none());
1441    }
1442
1443    #[test]
1444    fn multiple_script_blocks_exports_combined() {
1445        let source = r#"
1446<script lang="ts">
1447export const version = '1.0';
1448</script>
1449<script setup lang="ts">
1450import { ref } from 'vue';
1451const count = ref(0);
1452</script>
1453"#;
1454        let info = parse_sfc_to_module(FileId(0), Path::new("Dual.vue"), source, 0, false);
1455        assert!(
1456            info.exports
1457                .iter()
1458                .any(|e| matches!(&e.name, crate::ExportName::Named(n) if n == "version")),
1459            "export from <script> block should be extracted"
1460        );
1461        assert!(
1462            info.imports.iter().any(|i| i.source == "vue"),
1463            "import from <script setup> block should be extracted"
1464        );
1465    }
1466
1467    #[test]
1468    fn lang_tsx_detected_as_typescript_jsx() {
1469        let scripts =
1470            extract_sfc_scripts(r#"<script lang="tsx">const el = <div>{x}</div>;</script>"#);
1471        assert_eq!(scripts.len(), 1);
1472        assert!(scripts[0].is_typescript, "lang=tsx should be typescript");
1473        assert!(scripts[0].is_jsx, "lang=tsx should be jsx");
1474    }
1475
1476    #[test]
1477    fn multiline_html_comment_filters_all_script_blocks_inside() {
1478        let source = r#"
1479<!--
1480  This whole section is disabled:
1481  <script lang="ts">import { bad1 } from 'bad1';</script>
1482  <script lang="ts">import { bad2 } from 'bad2';</script>
1483-->
1484<script lang="ts">import { good } from 'good';</script>
1485"#;
1486        let scripts = extract_sfc_scripts(source);
1487        assert_eq!(scripts.len(), 1);
1488        assert!(scripts[0].body.contains("good"));
1489    }
1490
1491    #[test]
1492    fn script_src_generates_side_effect_import() {
1493        let info = parse_sfc_to_module(
1494            FileId(0),
1495            Path::new("External.vue"),
1496            r#"<script src="./external-logic.ts" lang="ts"></script>"#,
1497            0,
1498            false,
1499        );
1500        assert!(
1501            info.imports
1502                .iter()
1503                .any(|i| i.source == "./external-logic.ts"
1504                    && matches!(i.imported_name, ImportedName::SideEffect)),
1505            "script src should generate a side-effect import"
1506        );
1507    }
1508
1509    #[test]
1510    fn parse_sfc_no_script_returns_empty_module() {
1511        let info = parse_sfc_to_module(
1512            FileId(0),
1513            Path::new("Empty.vue"),
1514            "<template><div>Hello</div></template>",
1515            42,
1516            false,
1517        );
1518        assert!(info.imports.is_empty());
1519        assert!(info.exports.is_empty());
1520        assert_eq!(info.content_hash, 42);
1521        assert_eq!(info.file_id, FileId(0));
1522    }
1523
1524    #[test]
1525    fn parse_sfc_has_line_offsets() {
1526        let info = parse_sfc_to_module(
1527            FileId(0),
1528            Path::new("LineOffsets.vue"),
1529            r#"<script lang="ts">const x = 1;</script>"#,
1530            0,
1531            false,
1532        );
1533        assert!(!info.line_offsets.is_empty());
1534    }
1535
1536    #[test]
1537    fn parse_sfc_has_suppressions() {
1538        let info = parse_sfc_to_module(
1539            FileId(0),
1540            Path::new("Suppressions.vue"),
1541            r#"<script lang="ts">
1542// fallow-ignore-file
1543export const foo = 1;
1544</script>"#,
1545            0,
1546            false,
1547        );
1548        assert!(!info.suppressions.is_empty());
1549    }
1550
1551    #[test]
1552    fn source_type_jsx_detection() {
1553        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
1554        assert_eq!(scripts.len(), 1);
1555        assert!(!scripts[0].is_typescript);
1556        assert!(scripts[0].is_jsx);
1557    }
1558
1559    #[test]
1560    fn source_type_plain_js_detection() {
1561        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
1562        assert_eq!(scripts.len(), 1);
1563        assert!(!scripts[0].is_typescript);
1564        assert!(!scripts[0].is_jsx);
1565    }
1566
1567    #[test]
1568    fn is_sfc_file_rejects_no_extension() {
1569        assert!(!is_sfc_file(Path::new("Makefile")));
1570    }
1571
1572    #[test]
1573    fn is_sfc_file_rejects_mdx() {
1574        assert!(!is_sfc_file(Path::new("post.mdx")));
1575    }
1576
1577    #[test]
1578    fn is_sfc_file_rejects_css() {
1579        assert!(!is_sfc_file(Path::new("styles.css")));
1580    }
1581
1582    #[test]
1583    fn multiple_script_blocks_both_have_offsets() {
1584        let source = r#"<script lang="ts">const a = 1;</script>
1585<script setup lang="ts">const b = 2;</script>"#;
1586        let scripts = extract_sfc_scripts(source);
1587        assert_eq!(scripts.len(), 2);
1588        let offset0 = scripts[0].byte_offset;
1589        let offset1 = scripts[1].byte_offset;
1590        assert_eq!(
1591            &source[offset0..offset0 + "const a = 1;".len()],
1592            "const a = 1;"
1593        );
1594        assert_eq!(
1595            &source[offset1..offset1 + "const b = 2;".len()],
1596            "const b = 2;"
1597        );
1598    }
1599
1600    #[test]
1601    fn script_with_src_and_lang() {
1602        let scripts = extract_sfc_scripts(r#"<script src="./logic.ts" lang="tsx"></script>"#);
1603        assert_eq!(scripts.len(), 1);
1604        assert_eq!(scripts[0].src.as_deref(), Some("./logic.ts"));
1605        assert!(scripts[0].is_typescript);
1606        assert!(scripts[0].is_jsx);
1607    }
1608
1609    #[test]
1610    fn extract_style_block_lang_scss() {
1611        let source = r#"<template/><style lang="scss">@import 'Foo';</style>"#;
1612        let styles = extract_sfc_styles(source);
1613        assert_eq!(styles.len(), 1);
1614        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
1615        assert!(styles[0].body.contains("@import"));
1616        assert!(styles[0].src.is_none());
1617    }
1618
1619    #[test]
1620    fn extract_style_block_with_src() {
1621        let source = r#"<style src="./theme.scss" lang="scss"></style>"#;
1622        let styles = extract_sfc_styles(source);
1623        assert_eq!(styles.len(), 1);
1624        assert_eq!(styles[0].src.as_deref(), Some("./theme.scss"));
1625        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
1626    }
1627
1628    #[test]
1629    fn extract_style_block_plain_no_lang() {
1630        let source = r"<style>.foo { color: red; }</style>";
1631        let styles = extract_sfc_styles(source);
1632        assert_eq!(styles.len(), 1);
1633        assert!(styles[0].lang.is_none());
1634    }
1635
1636    #[test]
1637    fn extract_multiple_style_blocks() {
1638        let source = r#"<style lang="scss">@import 'a';</style>
1639<style scoped lang="scss">@import 'b';</style>"#;
1640        let styles = extract_sfc_styles(source);
1641        assert_eq!(styles.len(), 2);
1642    }
1643
1644    #[test]
1645    fn style_block_inside_html_comment_filtered() {
1646        let source = r#"<!-- <style lang="scss">@import 'bad';</style> -->
1647<style lang="scss">@import 'good';</style>"#;
1648        let styles = extract_sfc_styles(source);
1649        assert_eq!(styles.len(), 1);
1650        assert!(styles[0].body.contains("good"));
1651    }
1652
1653    #[test]
1654    fn parse_sfc_extracts_style_imports_with_from_style_flag() {
1655        let info = parse_sfc_to_module(
1656            FileId(0),
1657            Path::new("Foo.vue"),
1658            r#"<template/><style lang="scss">@import 'Foo';</style>"#,
1659            0,
1660            false,
1661        );
1662        let style_import = info
1663            .imports
1664            .iter()
1665            .find(|i| i.source == "./Foo")
1666            .expect("scss @import 'Foo' should be normalized to ./Foo");
1667        assert!(
1668            style_import.from_style,
1669            "imports from <style> blocks must carry from_style=true so the resolver \
1670             enables SCSS partial fallback for the SFC importer"
1671        );
1672        assert!(matches!(
1673            style_import.imported_name,
1674            ImportedName::SideEffect
1675        ));
1676    }
1677
1678    #[test]
1679    fn parse_sfc_extracts_style_plugin_as_default_import() {
1680        let info = parse_sfc_to_module(
1681            FileId(0),
1682            Path::new("Foo.vue"),
1683            r#"<template/><style>@plugin "./tailwind-plugin.js";</style>"#,
1684            0,
1685            false,
1686        );
1687        let plugin_import = info
1688            .imports
1689            .iter()
1690            .find(|i| i.source == "./tailwind-plugin.js")
1691            .expect("style @plugin should create an import");
1692        assert!(plugin_import.from_style);
1693        assert!(matches!(plugin_import.imported_name, ImportedName::Default));
1694    }
1695
1696    #[test]
1697    fn parse_sfc_extracts_style_src_with_from_style_flag() {
1698        let info = parse_sfc_to_module(
1699            FileId(0),
1700            Path::new("Bar.vue"),
1701            r#"<style src="./Bar.scss" lang="scss"></style>"#,
1702            0,
1703            false,
1704        );
1705        let style_src = info
1706            .imports
1707            .iter()
1708            .find(|i| i.source == "./Bar.scss")
1709            .expect("<style src=\"./Bar.scss\"> should produce a side-effect import");
1710        assert!(style_src.from_style);
1711    }
1712
1713    #[test]
1714    fn parse_sfc_skips_unsupported_style_lang_body_but_keeps_src() {
1715        let info = parse_sfc_to_module(
1716            FileId(0),
1717            Path::new("Baz.vue"),
1718            r#"<style lang="postcss" src="./Baz.pcss">@custom-rule "skipped";</style>"#,
1719            0,
1720            false,
1721        );
1722        assert!(
1723            info.imports.iter().any(|i| i.source == "./Baz.pcss"),
1724            "src reference should still be seeded for unsupported lang"
1725        );
1726        assert!(
1727            !info.imports.iter().any(|i| i.source.contains("skipped")),
1728            "postcss body should not be scanned for @import directives"
1729        );
1730    }
1731
1732    fn asset_refs(source: &str) -> Vec<String> {
1733        super::collect_template_asset_refs(source)
1734            .into_iter()
1735            .map(|(s, _)| s)
1736            .collect()
1737    }
1738
1739    #[test]
1740    fn captures_static_relative_template_asset_refs() {
1741        assert_eq!(
1742            asset_refs(r#"<template><img src="./logo.png" /></template>"#),
1743            vec!["./logo.png".to_string()]
1744        );
1745        assert_eq!(
1746            asset_refs(r#"<source src="../media/clip.mp4">"#),
1747            vec!["../media/clip.mp4".to_string()]
1748        );
1749        assert_eq!(
1750            asset_refs(r#"<video poster="./thumb.jpg"></video>"#),
1751            vec!["./thumb.jpg".to_string()]
1752        );
1753    }
1754
1755    #[test]
1756    fn skips_dynamic_alias_root_remote_and_query_asset_refs() {
1757        // Dynamic bindings (Vue `:src`, `v-bind:src`, Svelte `bind:src` / `src={}`).
1758        assert!(asset_refs(r#"<img :src="logo" />"#).is_empty());
1759        assert!(asset_refs(r#"<img v-bind:src="logo" />"#).is_empty());
1760        assert!(asset_refs(r#"<img bind:src="logo" />"#).is_empty());
1761        assert!(asset_refs(r"<img src={logo} />").is_empty());
1762        assert!(asset_refs(r#"<img data-src="./x.png" />"#).is_empty());
1763        // Alias-prefixed, root-relative, remote, bare: not plain relative literals.
1764        assert!(asset_refs(r#"<img src="@/assets/x.png" />"#).is_empty());
1765        assert!(asset_refs(r#"<img src="/logo.png" />"#).is_empty());
1766        assert!(asset_refs(r#"<img src="https://cdn/x.png" />"#).is_empty());
1767        // Query / hash suffix abstains (the resolver cannot verify them).
1768        assert!(asset_refs(r#"<img src="./x.png?inline" />"#).is_empty());
1769        // Interpolated value abstains.
1770        assert!(asset_refs(r#"<img src="{{ logo }}" />"#).is_empty());
1771    }
1772
1773    #[test]
1774    fn skips_custom_component_src_prop() {
1775        // A custom component's `src` PROP must never be read as an asset edge.
1776        assert!(asset_refs(r#"<MyImage src="./x.png" />"#).is_empty());
1777        assert!(asset_refs(r#"<AppIcon src="../icons/y.svg" />"#).is_empty());
1778    }
1779
1780    #[test]
1781    fn skips_asset_refs_inside_script_style_and_comments() {
1782        // Masked regions must not contribute asset refs.
1783        assert!(asset_refs(r#"<script>const x = "<img src='./a.png'>"</script>"#).is_empty());
1784        assert!(asset_refs(r#"<style>/* <img src="./b.png"> */ .x{}</style>"#).is_empty());
1785        assert!(asset_refs(r#"<!-- <img src="./c.png" /> -->"#).is_empty());
1786    }
1787
1788    #[test]
1789    fn parse_sfc_emits_template_asset_as_side_effect_import() {
1790        let info = parse_sfc_to_module(
1791            FileId(0),
1792            Path::new("Hero.vue"),
1793            r#"<template><img src="./hero.png" /></template><script>let x=1</script>"#,
1794            0,
1795            false,
1796        );
1797        assert!(
1798            info.imports.iter().any(|i| i.source == "./hero.png"
1799                && matches!(i.imported_name, ImportedName::SideEffect)
1800                && !i.from_style),
1801            "template <img src> should seed a SideEffect import: {:?}",
1802            info.imports
1803        );
1804    }
1805
1806    // -- Svelte 5 `$props()` rune harvest (W1.1 piece 2) -----------------------
1807
1808    fn svelte_props(source: &str) -> Vec<crate::ModuleInfo> {
1809        vec![parse_sfc_to_module(
1810            FileId(0),
1811            Path::new("Component.svelte"),
1812            source,
1813            0,
1814            false,
1815        )]
1816    }
1817
1818    fn prop_names(info: &crate::ModuleInfo) -> Vec<String> {
1819        let mut names: Vec<String> = info
1820            .component_props
1821            .iter()
1822            .map(|p| p.name.clone())
1823            .collect();
1824        names.sort();
1825        names
1826    }
1827
1828    #[test]
1829    fn svelte_shorthand_props_harvested() {
1830        // AC-3: `let { a, b } = $props()` harvests `a`, `b` with `local == name`.
1831        let info = &svelte_props(r"<script>let { a, b } = $props();</script>")[0];
1832        assert_eq!(prop_names(info), vec!["a", "b"]);
1833        for prop in &info.component_props {
1834            assert_eq!(prop.local, prop.name);
1835        }
1836    }
1837
1838    #[test]
1839    fn svelte_renamed_prop_tracks_local_and_script_use() {
1840        // AC-4: `let { a: alias } = $props()` harvests `a` with `local == "alias"`,
1841        // and a reference to `alias` sets `used_in_script` for prop `a`.
1842        let info =
1843            &svelte_props(r"<script>let { a: alias } = $props(); console.log(alias);</script>")[0];
1844        assert_eq!(prop_names(info), vec!["a"]);
1845        let prop = &info.component_props[0];
1846        assert_eq!(prop.local, "alias");
1847        assert!(
1848            prop.used_in_script,
1849            "alias is referenced, so a is used in script"
1850        );
1851    }
1852
1853    #[test]
1854    fn svelte_unreferenced_prop_is_unused_in_script() {
1855        let info = &svelte_props(r"<script>let { a } = $props();</script>")[0];
1856        assert_eq!(prop_names(info), vec!["a"]);
1857        assert!(!info.component_props[0].used_in_script);
1858    }
1859
1860    #[test]
1861    fn svelte_default_prop_peeled() {
1862        // AC-5: `let { a = 1 } = $props()` harvests `a` (default peeled).
1863        let info = &svelte_props(r"<script>let { a = 1 } = $props();</script>")[0];
1864        assert_eq!(prop_names(info), vec!["a"]);
1865    }
1866
1867    #[test]
1868    fn svelte_bindable_default_peeled() {
1869        // The bindable form `let { a = $bindable() } = $props()`: `a` is still a
1870        // declared prop (the default value is irrelevant to the local name).
1871        let info = &svelte_props(r"<script>let { a = $bindable() } = $props();</script>")[0];
1872        assert_eq!(prop_names(info), vec!["a"]);
1873    }
1874
1875    #[test]
1876    fn svelte_rest_element_sets_fallthrough_abstain() {
1877        // AC-6: `let { a, ...rest } = $props()` sets has_props_attrs_fallthrough.
1878        let info = &svelte_props(r"<script>let { a, ...rest } = $props();</script>")[0];
1879        assert!(info.has_props_attrs_fallthrough);
1880    }
1881
1882    #[test]
1883    fn svelte_bare_identifier_binding_sets_unharvestable_abstain() {
1884        // AC-7: `let p = $props()` (no destructure) sets has_unharvestable_props.
1885        let info = &svelte_props(r"<script>let p = $props(); console.log(p.x);</script>")[0];
1886        assert!(info.has_unharvestable_props);
1887        assert!(info.component_props.is_empty());
1888    }
1889
1890    #[test]
1891    fn svelte_nested_destructure_sets_unharvestable_abstain() {
1892        // A nested destructure (`{ a: { x } }`) cannot be flattened. Abstain.
1893        let info = &svelte_props(r"<script>let { a: { x } } = $props();</script>")[0];
1894        assert!(info.has_unharvestable_props);
1895    }
1896
1897    #[test]
1898    fn svelte_prop_used_only_in_markup_credited_as_template_root() {
1899        // AC-8: a prop used only in markup (`{a}`) is credited via
1900        // `apply_template_usage`, so `used_in_template` is set (parity with Vue).
1901        let info = &svelte_props(r"<script>let { a } = $props();</script><p>{a}</p>")[0];
1902        assert_eq!(prop_names(info), vec!["a"]);
1903        assert!(
1904            info.component_props[0].used_in_template,
1905            "a is used in markup, so used_in_template should be true"
1906        );
1907    }
1908
1909    #[test]
1910    fn svelte_module_script_props_not_harvested() {
1911        // `$props()` is instance-only; a module-context script must not harvest.
1912        let info = &svelte_props(
1913            r"<script module>let { a } = $props();</script><script>let { b } = $props();</script>",
1914        )[0];
1915        // Only the instance script's `b` is harvested.
1916        assert_eq!(prop_names(info), vec!["b"]);
1917    }
1918
1919    // -- Svelte custom-event dispatch harvest (unused-svelte-event) ------------
1920
1921    fn dispatched_names(info: &crate::ModuleInfo) -> Vec<String> {
1922        let mut names: Vec<String> = info
1923            .svelte_dispatched_events
1924            .iter()
1925            .map(|e| e.name.clone())
1926            .collect();
1927        names.sort();
1928        names
1929    }
1930
1931    #[test]
1932    fn svelte_dispatch_literal_event_is_harvested() {
1933        let info = &svelte_props(
1934            r"<script>import { createEventDispatcher } from 'svelte';
1935              const dispatch = createEventDispatcher();
1936              function save() { dispatch('save'); }</script>",
1937        )[0];
1938        assert_eq!(dispatched_names(info), vec!["save"]);
1939        assert!(!info.has_dynamic_dispatch);
1940    }
1941
1942    #[test]
1943    fn svelte_dispatch_without_svelte_import_is_ignored() {
1944        // A local `createEventDispatcher` not imported from `svelte` is not a
1945        // dispatcher; the `dispatch('save')` call records nothing.
1946        let info = &svelte_props(
1947            r"<script>function createEventDispatcher() { return () => {}; }
1948              const dispatch = createEventDispatcher();
1949              dispatch('save');</script>",
1950        )[0];
1951        assert!(info.svelte_dispatched_events.is_empty());
1952    }
1953
1954    #[test]
1955    fn svelte_dynamic_dispatch_sets_abstain() {
1956        let info = &svelte_props(
1957            r"<script>import { createEventDispatcher } from 'svelte';
1958              const dispatch = createEventDispatcher();
1959              function fire(name) { dispatch(name); }</script>",
1960        )[0];
1961        assert!(
1962            info.has_dynamic_dispatch,
1963            "a non-literal dispatch arg must set the abstain flag"
1964        );
1965    }
1966
1967    #[test]
1968    fn svelte_dispatch_whole_value_use_sets_abstain() {
1969        let info = &svelte_props(
1970            r"<script>import { createEventDispatcher } from 'svelte';
1971              const dispatch = createEventDispatcher();
1972              forward(dispatch);</script>",
1973        )[0];
1974        assert!(
1975            info.has_dynamic_dispatch,
1976            "passing the dispatch binding as a whole value must set the abstain flag"
1977        );
1978    }
1979
1980    #[test]
1981    fn svelte_listened_event_on_component_is_harvested() {
1982        let info =
1983            &svelte_props(r"<script>import Child from './Child.svelte';</script><Child on:save />")
1984                [0];
1985        assert!(info.svelte_listened_events.contains(&"save".to_string()));
1986    }
1987}