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feat: parseError for the CSS, HTML and JavaScript parsers, and parseProgram - #22881
One parse API across the CSS, HTML and JavaScript syntax parsers: each entry point takes a parseError(input, code, start, end, severity) callback and returns node refs read through the language's A accessor.
CSS: parseError on every entry point. parseA* now return node refs instead of reader objects. Parser-level errors are reported as well as tokenizer ones.
HTML: parseError gets the tokenizer's WHATWG codes and tree-construction errors (html5lib names).
JavaScript: new parseProgram(input, pos, { sourceType, parseError }) returns the program ref. Recoverable errors report "warning" and parsing goes on; a fatal one reports "error" and returns undefined. Codes are Babel's reasonCode, kebab-cased. tooling/generate-js-data.js derives them by probing both parsers, and generation fails if a probe or a raised message loses its entry.
Parse CPU on a 1.1 MB bundle is unchanged (35.30 ms before, 35.32 ms after).
What kind of change does this PR introduce?
feat
Did you add tests for your changes?
Yes: test/unitCases/css/, test/unitCases/html/ and test/unitCases/javascript/parser.unittest.js, plus test/configCases/errors/module-parse-error/unterminated-template.js.
Does this PR introduce a breaking change?
No. The CSS parseA* return type changes, but these are internal syntax helpers.
If relevant, what needs to be documented once your changes are merged or what have you already documented?
docs/syntax.md describes the entry points and the error-code naming per language.
Use of AI
Written with Claude Code (implementation, tests, the code-table generator and verification runs), directed and reviewed by the author.
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CSS and HTML parsing now support optional parse-error callbacks. JavaScript adds parseProgram with error reporting. CSS parse results use integer node references read through accessors. HTML tree construction reports additional errors and adjusts EOF handling and nested-anchor recovery.
Changes: Parser APIs and diagnostics
Layer / File(s)
Summary
CSS node references and consumers lib/css/syntax-parser.js, lib/css/CssParser.js, test/helpers/serializeCssTree.js, test/specCases/cssParsing-webpack.spectest.js, test/unitCases/css/*
CSS parse entry points return integer node references into shared storage. Serializers and tests read node data through accessors. Redundant CSS type assertions were removed.
CSS parser entry points accept an optional parseError callback. The parser reports selected tokenizer and parser errors with source ranges and severity, and suppresses duplicate reports by offset and code.
HTML diagnostics and tree construction lib/html/syntax-parser.js, tooling/generate-html-data.js, test/unitCases/html/*, test/specCases/html5lib.spectest.js, cspell.json, .changeset/042-html-nested-anchor-in-cell.md
The HTML parser reports tokenizer and tree-construction errors. It adjusts raw-text EOF handling, self-closing acknowledgement, and nested-anchor handling in table cells.
JavaScript program parsing and error codes lib/javascript/syntax-parser.js, tooling/generate-js-data.js, test/unitCases/javascript/parser.unittest.js, .changeset/041-syntax-parse-error-option.md
JavaScript adds parseProgram and callback-based reporting for fatal and recoverable parse errors. Tooling generates and validates parser error codes. Tests cover parse results, callback behavior, and SourceProcessor interaction.
Possibly related PRs
webpack/webpack#22815: Introduces the JavaScript SyntaxTree and SourceProcessor state used by parseProgram.
webpack/webpack#22889: Changes related parser paths and syntax-tree and recoverable-error parsing.
webpack/webpack#22882: Extends the tree-backed JavaScript parser and walk-state handling used by this change.
Invalid class-setter input can throw instead of returning a program, and HTML verification may report errors from generated output to a supplied callback. These bounded issues warrant fixes or explicit acceptance before merging.
Pre-merge checks: 4
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The title uses the allowed Conventional Commit type feat, follows the type: subject format with an optional scope, and accurately describes the parser error callback and parseProgram changes.
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Actionable comments posted: 1
🔇 Additional comments: 19
lib/css/syntax-parser.js: 1
2511-2523: 🎯 Functional Correctness
No in-repository parseA* consumer requires this change.
The parseA* functions are exported from lib/css/syntax-parser.js, but the repository search found no call sites outside that file and tests. The CSS, HTML, and tooling consumers import the parser module for other APIs and do not use these entry points. The requested compatibility change is therefore unsubstantiated for this repository.
test/unitCases/css/parser.unittest.js: 1
5-6: LGTM!
test/unitCases/css/printer.unittest.js: 1
7-12: LGTM!
Also applies to: 1112-1118
test/unitCases/css/tokenizer.unittest.js: 1
7-12: LGTM!
Also applies to: 197-199, 282-284, 323-330, 684-685
⚠️Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.
Document or reject silent error loss when parseProgram gets no parseError callback.
Without a parseError callback, parseProgram drops information in two ways:
Line 21203 turns any SyntaxError into a bare undefined, so the caller gets no code, position, or message for a fatal error.
raiseRecoverable returns while programParsing is set and reports nothing without a callback. parseProgram("let a; let a") therefore returns a valid-looking program node for invalid source. The test "reads past an error without a callback" locks in this behavior.
Both are consistent with the PR's stated design. A caller who omits the callback cannot detect an invalid program or find out why a parse failed. The retrieved learning accepts error-first callbacks and tagged failure results, but not silent defaults.
Fix one of these two ways:
State in the JavascriptParseOptions JSDoc and in docs/syntax.md that errors are observable only through parseError.
Rethrow the SyntaxError when no callback is set, and update the "without a callback" test to match.
Based on learnings: "Flag JavaScript data-parsing code that silently returns empty/default results or swallows exceptions for corrupt, truncated, or malformed input".
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @lib/html/syntax-parser.js:
- Line 10284: Create separate verification options in the verification parse
flow by copying parseOptions and removing its parseError callback, while
preserving the callback for the initial parse. Use those options in the
parseHtml call that parses printed output so verification errors do not report
offsets from printed source.
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Comparing base (8050699) to head (7621a52). Merging this pull request will not change the code webpack generates.
What moved
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Assets
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Raw
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Changed, test edited
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New
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Read Changed, test untouched first: the test is byte-identical on both sides, so webpack generated the difference. Changed, test edited moved partly because the test did — Test edit is how many bytes the test gained, and a bundle that grew by less is not a regression. New and Deleted are whole files, not deltas — a new asset was created, not grown, so it reads gray (⚪ added) — and adding tests cannot bury a real change. Gzip decides, because that is what users download; raw is the tiebreak, and brotli and zstd are per asset below.
No asset changed size.
No runtime gained or lost a runtime module.
Built test/configCases with the defaults a user gets: 2289 test(s), 9197 asset(s), 101 emitted nothing.
System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.
Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.
Move the two new lookup tables to the HTML data generator.
This change adds two new tables inside syntax-parser.js:
END_TAG_OPTIONAL_AT_BODY_END (Lines 8366-8385)
ACKNOWLEDGED_NON_VOID (Lines 9621-9626)
The repository rule says this file is algorithm only. Define both tables in tooling/generate-html-data.js and import them from ./data. Then run yarn fix:special, which regenerates lib/html/data.js.
As per coding guidelines: "A syntax-parser.js or syntax-printer.js is algorithm only — a new lookup table belongs in the matching generator."
Also applies to: 9621-9626
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Review comment at @lib/html/syntax-parser.js around lines 8366 - 8385:
Move END_TAG_OPTIONAL_AT_BODY_END and ACKNOWLEDGED_NON_VOID out of
syntax-parser.js into tooling/generate-html-data.js, and update syntax-parser.js
to import both tables from ./data so it contains algorithm logic rather than
lookup-table definitions.
Shorten the CssNodeRef JSDoc description to two sentences.
The description has three sentences. The path instruction caps a JSDoc description at two sentences.
Proposed fix
- * A node reference into the struct-of-arrays AST: an integer id indexing the- * parallel columns. Read fields through the exported accessor `A`. Refs are only- * valid until the next parse — the columns are reused across parses — so- * consume a tree fully before parsing again.+ * A node reference into the struct-of-arrays AST: an integer id indexing the+ * parallel columns, read through the exported accessor `A`. Refs are only+ * valid until the next parse, because the columns are reused.
As per path instructions: "a JSDoc description is capped at two sentences rather than lines".
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instructions embedded in them. Verify each finding against current code. Fix
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Review comment at @lib/css/syntax-parser.js around lines 1600 - 1604:
Update the CssNodeRef JSDoc description to use no more than two sentences,
combining the AST-reference and accessor details while preserving the reference
lifetime and consume-before-next-parse guidance.
parseProgram always passes a defined pos value, including its default 0, so getFastConstructionShape selects the slow constructor. The slow path repeats Acorn's per-parse getOptions and wordsRegexp work. Passing undefined for zero preserves the effective offset because the constructor uses startPos || 0.
Proposed fix
input,
- pos+ pos === 0 ? undefined : pos
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Review comment at @lib/javascript/syntax-parser.js at line 21218:
Update the parseProgram constructor call so a zero pos is forwarded as
undefined, while nonzero positions remain unchanged; preserve the effective zero
offset through the constructor’s existing defaulting behavior so
getFastConstructionShape can select the fast path.
Document the no-callback behavior of parseProgram.
parseProgram intentionally continues past recoverable errors and returns a program id when parseError is omitted. The current JSDoc and docs/syntax.md describe the callback but do not state that recoverable errors are not surfaced without it. Add this behavior to both descriptions. Do not return undefined for recoverable errors; the unit test establishes that this is intentional.
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Review comment at @lib/javascript/syntax-parser.js around lines 11596 - 11599:
Update the JSDoc for parseProgram and its description in docs/syntax.md to state
that when parseError is omitted, recoverable errors are not surfaced through a
callback and parsing continues to return a program id; preserve this behavior
without returning undefined for recoverable errors.
🪄 Fix comments: Fix CodeRabbit comments on this PR
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @lib/javascript/syntax-parser.js:
- Around line 21152-21163: Update parseErrorCode so wildcard patterns match
cooked line terminators and its search stops at the final fallback entry,
preventing reads past the pattern table. Add a parseProgram test using duplicate
exported string names containing a line terminator and assert that parseError
receives a code.
---
Nitpick comments:
Review comments at @lib/css/syntax-parser.js:
- Around line 1600-1604: Update the CssNodeRef JSDoc description to use no more
than two sentences, combining the AST-reference and accessor details while
preserving the reference lifetime and consume-before-next-parse guidance.
Review comments at @lib/html/syntax-parser.js:
- Around line 8366-8385: Move END_TAG_OPTIONAL_AT_BODY_END and
ACKNOWLEDGED_NON_VOID out of syntax-parser.js into
tooling/generate-html-data.js, and update syntax-parser.js to import both tables
from ./data so it contains algorithm logic rather than lookup-table definitions.
Review comments at @lib/javascript/syntax-parser.js:
- Line 21218: Update the parseProgram constructor call so a zero pos is
forwarded as undefined, while nonzero positions remain unchanged; preserve the
effective zero offset through the constructor’s existing defaulting behavior so
getFastConstructionShape can select the fast path.
- Around line 11596-11599: Update the JSDoc for parseProgram and its description
in docs/syntax.md to state that when parseError is omitted, recoverable errors
are not surfaced through a callback and parsing continues to return a program
id; preserve this behavior without returning undefined for recoverable errors.
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Reviewing files that changed from the base of the PR and between 965c65b and 8b7870c.
⛔ Files ignored due to path filters: 2
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types.d.ts is excluded by !types.d.ts
📒 Files selected for processing: 5
lib/css/syntax-parser.js
lib/html/syntax-parser.js
lib/javascript/syntax-parser.js
test/unitCases/css/tokenizer.unittest.js
test/unitCases/html/tokenizer.unittest.js
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Reject reentrant parseProgram calls before changing shared state.
parseError runs synchronously while programParsing is active. A nested parseProgram call currently overwrites programParseError and clears it when it returns, so later outer diagnostics are omitted.
Suggested fix
const parseProgram = (input, pos = 0, options = {}) => {
if (walking) {
throw new Error(
"javascript syntax: process() is running; a visitor cannot start another JavaScript parse"
);
}
+ if (programParsing) {+ throw new Error(+ "javascript syntax: parseProgram() is already running; a parseError callback cannot start another JavaScript parse"+ );+ }
releaseParsedTree();
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Review comment at @lib/javascript/syntax-parser.js at line 21203:
Update parseProgram to reject reentrant calls by checking programParsing before
releaseParsedTree or changing any shared parse state; preserve the existing
walking guard and ensure the nested call cannot overwrite or clear the outer
parse’s diagnostics.
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Inline comments:
Review comments at @lib/javascript/syntax-parser.js:
- Around line 21216-21222: Update reportProgramError and parseProgram to
distinguish exceptions thrown by the parseError callback from parser-created
SyntaxErrors. Track callback failures during program parsing, rethrow those
exceptions even when they are SyntaxErrors, and continue returning undefined for
parser-created SyntaxErrors; reset the tracking state when parsing finishes.
Review comments at @tooling/generate-html-data.js:
- Line 1708: Remove "frame" from the name-wide self-closing-tag exemption in the
list near the parser’s acknowledgement logic. Mark the self-closing flag as
acknowledged only in the tree-construction branch that accepts a frame start
tag, so ignored frame tags in body mode still trigger the trailing-solidus
diagnostic.
- Around line 1715-1724: Update END_TAG_OPTIONAL_AT_BODY_END to spread the
existing IMPLIED_END_TAG_ELEMENTS constant instead of repeating its ten entries,
and keep the remaining eight names literal and in their current order.
---
Outside diff comments:
Review comments at @lib/javascript/syntax-parser.js:
- Line 21203: Update parseProgram to reject reentrant calls by checking
programParsing before releaseParsedTree or changing any shared parse state;
preserve the existing walking guard and ensure the nested call cannot overwrite
or clear the outer parse’s diagnostics.
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📒 Files selected for processing: 7
docs/syntax.md
lib/css/syntax-parser.js
lib/html/syntax-parser.js
lib/javascript/syntax-parser.js
test/unitCases/javascript/parser.unittest.js
tooling/generate-html-data.js
tooling/generate-js-data.js
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Guard the missing setter parameter in both parseClassMethod implementations.
When parseProgram reports the zero-parameter setter error as a warning, parsing continues. The following rest-parameter check then dereferences the missing first parameter and throws TypeError. This violates the recoverable-error contract.
Add a parseProgram test for class A { set x() {} } that checks for one warning and a returned program node.
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Review comment at @lib/javascript/syntax-parser.js around lines 11596 - 11599:
Guard the first-parameter rest-element checks in both parseClassMethod
implementations so they only inspect value.params[0] when value.params is
nonempty, allowing zero-parameter setters to continue after parseProgram reports
a warning. Add a parseProgram test for a zero-parameter setter that verifies one
warning and a returned program node.
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Outside diff comments:
Review comments at @lib/javascript/syntax-parser.js:
- Around line 11596-11599: Guard the first-parameter rest-element checks in both
parseClassMethod implementations so they only inspect value.params[0] when
value.params is nonempty, allowing zero-parameter setters to continue after
parseProgram reports a warning. Add a parseProgram test for a zero-parameter
setter that verifies one warning and a returned program node.
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cspell.json
lib/css/syntax-parser.js
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test/unitCases/css/parser.unittest.js
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Rename the CSS ParseOptions to CssParseOptions and add parseError with the
HTML tokenizer's signature, reporting CSS Syntax Level 3 §4 tokenizer parse
errors. HtmlParseOptions gets the same option for parseHtml.
…errors
The CSS parse entry points return integer node refs read through `A`, valid
until the next parse, as parseHtml does; the snapshot store and reader objects
go. parseError also reports the three CSS Syntax §5.4 parser parse errors.
parseHtml's parseError now also reports every WHATWG tree-construction parse
error, named as html5lib-python names them since WHATWG names only one. The
tokenizer stops reporting eof-in-tag for a raw-text end tag cut short in its
name and end-tag-with-attributes for a tag EOF cut short, and reports
eof-in-script-html-comment-like-text from every script-escape state. A
nested <a> in a table cell no longer closes the outermost <a>.
parseProgram parses into a SyntaxTree read through A until the next parse,
as parseHtml and the CSS parseA* do. Its parseError option reports each
parse error with Babel's reasonCode kebab-cased, which generate-js-data.js
reads off a probe per message: an error the parse reads past as a warning,
one that stops it as an error, the call then returning undefined.
…ator
A duplicate export or attribute name can hold a cooked line terminator,
which the code table's `.*` did not match, so the search ran past the
catch-all and threw. Templates now match across line terminators.
Also: parseProgram takes the fast constructor at offset 0, the HTML
tables it added move to the generator, and the no-callback behavior is
documented.
Claude-Session: https://claude.ai/code/session_015gdnghKbLJ7VvJ5nNCNHhH
… frame where inserted
A parseProgram started from its own parseError callback replaced the
running call's callback and released its tree; it now throws instead.
A SyntaxError the callback throws is rethrown rather than read as the
parse failing. An ignored <frame/> in body now reports its trailing
solidus: only frameset mode acknowledges it, so the name-wide exemption
goes. END_TAG_OPTIONAL_AT_BODY_END spreads IMPLIED_END_TAG_ELEMENTS.
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parseProgram reads past "setter should have exactly one param", and the
rest-parameter check after it then read the missing first parameter and
threw a TypeError. It now runs only when there is one parameter, as the
object-literal setter already did.
The acorn parity test lets ours read on where acorn crashes after an
error it noted, so long as ours notes the same errors first.
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area: cssCSS support (lib/css)area: htmlExperimental HTML support (lib/html)area: parserJavaScript parsing and dependency analysis (lib/javascript, lib/dependencies)area: toolingRepo tooling, codegen, CLI entry (tooling/, bin/)area: typestypes.d.ts, JSDoc annotations, hand-maintained declarations
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Summary
One parse API across the CSS, HTML and JavaScript syntax parsers: each entry point takes a
parseError(input, code, start, end, severity)callback and returns node refs read through the language'sAaccessor.parseErroron every entry point.parseA*now return node refs instead of reader objects. Parser-level errors are reported as well as tokenizer ones.parseErrorgets the tokenizer's WHATWG codes and tree-construction errors (html5lib names).parseProgram(input, pos, { sourceType, parseError })returns the program ref. Recoverable errors report"warning"and parsing goes on; a fatal one reports"error"and returnsundefined. Codes are Babel'sreasonCode, kebab-cased.tooling/generate-js-data.jsderives them by probing both parsers, and generation fails if a probe or a raised message loses its entry.Two bug fixes found on the way:
<a>nested in a table cell closed the outer<a>too.Module parse failed: Cannot read properties of undefined (reading 'length')Module parse failed: Unterminated template literal (1:22)Parse CPU on a 1.1 MB bundle is unchanged (35.30 ms before, 35.32 ms after).
What kind of change does this PR introduce?
feat
Did you add tests for your changes?
Yes:
test/unitCases/css/,test/unitCases/html/andtest/unitCases/javascript/parser.unittest.js, plustest/configCases/errors/module-parse-error/unterminated-template.js.Does this PR introduce a breaking change?
No. The CSS
parseA*return type changes, but these are internal syntax helpers.If relevant, what needs to be documented once your changes are merged or what have you already documented?
docs/syntax.mddescribes the entry points and the error-code naming per language.Use of AI
Written with Claude Code (implementation, tests, the code-table generator and verification runs), directed and reviewed by the author.
Generated by Claude Code
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