feat/unambiguous-module-parsing - Branch - oxc-project/oxc

feat(parser): implement unambiguous module parsing for JS/TS files

#18124

Comparing

feat/unambiguous-module-parsing

(

a1d4a20

) with

main

(

ba9c750

)

Untouched: 42

Skipped: 3

No successful run was found on main ( d8f5c66) during the generation of this report, so ba9c750 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report.

Benchmarks

Skipped (3)

Passed

codegen[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/codegen.rs::codegen::bench_codegen

+1%

122 µs120.2 µs

transformer[cal.com.tsx]

tasks/benchmark/benches/transformer.rs::transformer::bench_transformer

+1%

26.5 ms26.2 ms

mangler[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/minifier.rs::minifier::bench_mangler

+1%

13.1 µs12.9 µs

transformer[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/transformer.rs::transformer::bench_transformer

135.4 µs135 µs

formatter[errors.ts]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

790.8 µs788.3 µs

linter[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/linter.rs::linter::bench_linter

745.7 µs744.1 µs

minifier[binder.ts]

tasks/benchmark/benches/minifier.rs::minifier::bench_minifier

4 ms4 ms

parser[react.development.js]

tasks/benchmark/benches/parser.rs::parser::bench_parser

1.2 ms1.2 ms

mangler[react.development.js]

tasks/benchmark/benches/minifier.rs::minifier::bench_mangler

251.1 µs250.7 µs

mangler[binder.ts]

tasks/benchmark/benches/minifier.rs::minifier::bench_mangler

701.8 µs700.8 µs

parser[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/parser.rs::parser::bench_parser

80.3 µs80.2 µs

parser[binder.ts]

tasks/benchmark/benches/parser.rs::parser::bench_parser

3.1 ms3.1 ms

codegen[react.development.js]

tasks/benchmark/benches/codegen.rs::codegen::bench_codegen

1.9 ms1.9 ms

parser[cal.com.tsx]

tasks/benchmark/benches/parser.rs::parser::bench_parser

25.4 ms25.3 ms

minifier[react.development.js]

tasks/benchmark/benches/minifier.rs::minifier::bench_minifier

2.5 ms2.5 ms

semantic[binder.ts]

tasks/benchmark/benches/semantic.rs::semantic::bench_semantic

3.1 ms3.1 ms

formatter[Search.tsx]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

1.9 ms1.9 ms

formatter[next.ts]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

2.8 ms2.8 ms

transformer[binder.ts]

tasks/benchmark/benches/transformer.rs::transformer::bench_transformer

1.7 ms1.7 ms

formatter[types.ts]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

14.8 ms14.8 ms

lexer[binder.ts]

tasks/benchmark/benches/lexer.rs::lexer::bench_lexer

885.2 µs885 µs

lexer[react.development.js]

tasks/benchmark/benches/lexer.rs::lexer::bench_lexer

358.1 µs358.1 µs

linter[cal.com.tsx]

tasks/benchmark/benches/linter.rs::linter::bench_linter

492.6 ms492.6 ms

lexer[cal.com.tsx]

tasks/benchmark/benches/lexer.rs::lexer::bench_lexer

5.5 ms5.5 ms

linter[binder.ts]

tasks/benchmark/benches/linter.rs::linter::bench_linter

49.6 ms49.6 ms

transformer[react.development.js]

tasks/benchmark/benches/transformer.rs::transformer::bench_transformer

721.3 µs721.3 µs

mangler[cal.com.tsx]

tasks/benchmark/benches/minifier.rs::minifier::bench_mangler

2.8 ms2.8 ms

estree[checker.ts]

tasks/benchmark/benches/parser.rs::parser::bench_estree

105.1 ms105.1 ms

codegen[cal.com.tsx]

tasks/benchmark/benches/codegen.rs::codegen::bench_codegen

33.8 ms33.8 ms

semantic[react.development.js]

tasks/benchmark/benches/semantic.rs::semantic::bench_semantic

1.3 ms1.3 ms

isolated-declarations[vue-id.ts]

tasks/benchmark/benches/transformer.rs::transformer::bench_isolated_declarations

57 ms57 ms

formatter[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

439.8 µs439.9 µs

formatter[index.tsx]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

4.6 ms4.6 ms

formatter[handle-comments.js]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

3.5 ms3.5 ms

formatter[core.js]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

2 ms2 ms

semantic[cal.com.tsx]

tasks/benchmark/benches/semantic.rs::semantic::bench_semantic

21.2 ms21.2 ms

formatter[App.tsx]

tasks/benchmark/benches/formatter.rs::formatter::bench_formatter

49 ms49 ms

semantic[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/semantic.rs::semantic::bench_semantic

62.5 µs62.6 µs

lexer[RadixUIAdoptionSection.jsx]

tasks/benchmark/benches/lexer.rs::lexer::bench_lexer

21 µs21.1 µs

linter[react.development.js]

tasks/benchmark/benches/linter.rs::linter::bench_linter

-1%

19.7 ms19.8 ms

minifier[cal.com.tsx]

tasks/benchmark/benches/minifier.rs::minifier::bench_minifier

-1%

35.5 ms35.8 ms

codegen[binder.ts]

tasks/benchmark/benches/codegen.rs::codegen::bench_codegen

-2%

4.2 ms4.3 ms

Commits

Click on a commit to change the comparison range

Base

main

ba9c750

+0.04%

feat(parser): implement unambiguous module parsing for JS/TS files This change implements speculative/unambiguous parsing for `.js`, `.jsx`, `.ts`, and `.tsx` files. Instead of assuming these files are modules or scripts upfront, we now parse them with `ModuleKind::Unambiguous` and upgrade to module mode when ESM syntax (import/export/import.meta) is detected. Key changes: - Add `ModuleKind::Unambiguous` variant for speculative parsing - Parser defers top-level await errors until module type is resolved - ESM syntax detection triggers upgrade from unambiguous to module - Vue loader upgrades unambiguous scripts to module mode - Linter tests updated to use explicit ESM extensions (.mjs/.mts) where needed This enables better handling of files where the module type isn't known ahead of time, improving compatibility with real-world JavaScript codebases. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

a1d4a20

2 hours ago

by Boshen

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