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docs(minifier): add Function.prototype.toString assumption#19758

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docs(minifier): add Function.prototype.toString assumption#19758
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02-26-docs_minifier_add_function.prototype.tostring_assumption

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@sapphi-red sapphi-red commented Feb 26, 2026

Added Function.prototype.toString assumption to the docs as I think we assumed this as well.

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@github-actions github-actions bot added A-minifier Area - Minifier C-docs Category - Documentation. Related to user-facing or internal documentation labels Feb 26, 2026
@sapphi-red sapphi-red requested a review from Boshen February 26, 2026 12:37
@sapphi-red sapphi-red marked this pull request as ready for review February 26, 2026 12:38
Copilot AI review requested due to automatic review settings February 26, 2026 12:38
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Pull request overview

This PR adds documentation for an implicit assumption that the Oxc minifier makes about Function.prototype.toString(). The assumption states that minified code does not rely on the specific source text returned by calling .toString() on functions.

Changes:

  • Added a new "Core Assumptions" section documenting that code should not depend on Function.prototype.toString() returning specific source text

@Boshen Boshen added the 0-merge Merge with Graphite Merge Queue label Feb 26, 2026
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Boshen commented Feb 26, 2026

Merge activity

  • Feb 26, 1:56 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
  • Feb 26, 1:56 PM UTC: Boshen added this pull request to the Graphite merge queue.
  • Feb 26, 2:06 PM UTC: The Graphite merge queue couldn't merge this PR because it was not satisfying all requirements (Failed CI: 'Lint', 'AST Changes').
  • Feb 27, 3:35 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
  • Feb 27, 3:40 AM UTC: sapphi-red added this pull request to the Graphite merge queue.
  • Feb 27, 3:46 AM UTC: Merged by the Graphite merge queue.

graphite-app bot pushed a commit that referenced this pull request Feb 26, 2026
Added `Function.prototype.toString` assumption to the docs as I think we assumed this as well.
@graphite-app graphite-app bot force-pushed the 02-26-docs_minifier_add_function.prototype.tostring_assumption branch from fcc1066 to 9b3a91c Compare February 26, 2026 13:59
@graphite-app graphite-app bot removed the 0-merge Merge with Graphite Merge Queue label Feb 26, 2026
@sapphi-red sapphi-red added the 0-merge Merge with Graphite Merge Queue label Feb 27, 2026
Added `Function.prototype.toString` assumption to the docs as I think we assumed this as well.
@graphite-app graphite-app bot force-pushed the 02-26-docs_minifier_add_function.prototype.tostring_assumption branch from 9b3a91c to 1b392de Compare February 27, 2026 03:40
@graphite-app graphite-app bot merged commit 1b392de into main Feb 27, 2026
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@graphite-app graphite-app bot deleted the 02-26-docs_minifier_add_function.prototype.tostring_assumption branch February 27, 2026 03:46
@graphite-app graphite-app bot removed the 0-merge Merge with Graphite Merge Queue label Feb 27, 2026
camc314 pushed a commit that referenced this pull request Mar 2, 2026
### 🚀 Features

- 733d6dc parser: Report error on `infer` outside conditional type
(#19879) (camc314)
- c2a42f6 allocator: Add `Vec::into_bump_slice_mut` (#19895)
(overlookmotel)
- ee4982b parser: Add `VARIANTS` const to `Kind` via `fieldless_enum!`
macro (#19877) (overlookmotel)
- b3dceae data_structures: Add `fieldless_enum!` macro (#19876)
(overlookmotel)
- 12b841e parser: Make all `Kind::is_*` methods `const` (#19874)
(overlookmotel)
- 25c2e25 estree/tokens: Add function to update tokens in place (#19856)
(overlookmotel)
- f78e6df parser: Add `mutate_tokens` Cargo feature (#19853)
(overlookmotel)
- 5036bb6 parser: Report error on `for await` in static blocks (#19844)
(camc314)
- 42bd431 parser: Report error for missing initializer in using decl
(#19824) (camc314)
- a2f58e5 parser: Report error for `implements` clause in non-ts files
(#19820) (Cameron)
- b25228a estree: Add `IS_COMPACT` const to `Formatter` trait (#19787)
(overlookmotel)
- e2a1b79 estree: Expose buffer and formatter of serializers (#19773)
(overlookmotel)
- 4699498 data_structures: Add `CodeBuffer::print_strs_array` (#19760)
(overlookmotel)
- 233f947 estree: `oxc_estree` crate export config and formatter types
(#19724) (overlookmotel)
- 5937a32 semantic: Introduce `symbol_declarations` method (#19609)
(camc314)
- ea6b796 parser: Add `LexerConfig::TOKENS_METHOD_IS_STATIC` const
(#19683) (overlookmotel)
- 655c38f semantic: Add "did you mean?" suggestions to undefined name
errors (#19102) (copilot-swe-agent)
- 9e11dc6 parser,estree,coverage: Collect tokens in parser and convert
to ESTree format (#19497) (camc314)
- c4a3677 parser: Report error for initializer in ambient context
(#19187) (camc314)

### 🐛 Bug Fixes

- abc7e19 codegen: Improve parenthesised checks when printing types
(#19880) (camc314)
- 017de5d parser: Update error code for type annotation in `for...in`
statement (#19882) (camc314)
- 7682e5a linter/plugins: Decode escapes in identifier tokens (#19838)
(overlookmotel)
- 06767ed estree/tokens: Convert `this` tokens in `TSTypeName` (#19815)
(overlookmotel)
- ef798af parser: Use TS8037 for satisfies expression in JS files
diagnostic (#19819) (camc314)
- 98ea5c5 parser: Use TS8016 for type assertions in JS files diagnostic
(#19818) (camc314)
- 1710f56 codegen: Remove double indentation for enum inside namespace
(#19775) (Dunqing)
- 9e4995c codegen: Print type annotation on `CatchParameter` (#19790)
(camc314)
- 297b2bb codegen: Wrap `TSConditionalType` in parens when necessary
(#19788) (camc314)
- cec7878 codegen: Print `definite` property on AccessorProperty
(#19786) (camc314)
- 6f395cf codegen: Print `definite` property on PropertyDefinition
(#19785) (camc314)
- b749373 codegen: Correctly parenthesise TSArrayType (#19784) (camc314)
- 876dc1b codegen: Print object property `this` param (#19783) (camc314)
- 93bb861 formatter: Trim trailing whitespace before breaking line
(#19740) (leaysgur)
- ed17bbf codegen: Print `override` keyword for method and property
definitions (#19753) (Dunqing)
- 6a59a76 parser: Improve error recovery for private identifiers in
property names (#19710) (Boshen)
- 3b96f41 codegen: Print comments in JSX expression containers and
spread attributes (#19701) (Boshen)
- f5694ce estree/tokens: Reverse field order of `regex` object in tokens
(#19679) (overlookmotel)
- b2b7a55 estree/tokens: Generate tokens for files with BOM (#19535)
(overlookmotel)
- 50a7514 estree: Fix tokens for JSX (#19524) (overlookmotel)
- a35063e minifier: Preserve side effects for meta property url reads
(#19668) (Boshen)
- 8ad3430 semantic/jsdoc: Handle even-numbered backtick sequences in
JSDoc parsing (#19664) (Boshen)

### ⚡ Performance

- 05ccf9f linter/plugins: Transfer tokens via raw transfer (#19893)
(overlookmotel)
- c1bfdcf estree/tokens: Preallocate sufficient space for tokens JSON
(#19851) (overlookmotel)
- 4b0611a estree/tokens: Introduce `ESTreeTokenConfig` trait (#19842)
(overlookmotel)
- 81bab90 estree/tokens: Do not JSON-encode keyword, punctuator, etc
tokens (#19814) (overlookmotel)
- 6260ddd estree/tokens: Do not JSON-encode `this` identifiers (#19813)
(overlookmotel)
- b378f4a estree/tokens: Do not JSON-encode JSX identifiers (#19812)
(overlookmotel)
- 5016d92 estree/tokens: Handle regex tokens separately (#19796)
(overlookmotel)
- 780a68e estree/tokens: Use strings from AST for identifier tokens
(#19744) (overlookmotel)
- dc9c2e3 estree: Use `CodeBuffer::print_strs_array` to reduce bounds
checks (#19766) (overlookmotel)
- 845da35 estree: Use `CodeBuffer::print_indent` (#19727)
(overlookmotel)
- ec88f6a estree/tokens: Serialize tokens while visiting AST (#19726)
(overlookmotel)
- bc6507f estree/tokens: Serialize with `ESTree` not `serde` (#19725)
(overlookmotel)
- ec24859 estree/tokens: Do not branch on presence of override twice
(#19721) (overlookmotel)
- dac14be estree/tokens: Replace hash map with `Vec` (#19718)
(overlookmotel)
- b9d2443 estree/tokens: Replace multiple hash sets into a single hash
map (#19716) (overlookmotel)
- 7233548 parser: Remove branches from `finish_next_inner` (#19695)
(overlookmotel)
- b5d9845 parser: Remove const generic param from `finish_next_inner`
(#19684) (overlookmotel)
- 8940f66 estree/tokens: Serialize tokens to compact JSON (#19572)
(overlookmotel)
- 136e39b parser/tokens: Pre-allocate capacity for tokens (#19543)
(overlookmotel)
- 6a6513c linter/plugins: Use Oxc tokens in plugins (#19498) (camc314)
- b3b2d30 parser: Introduce `ParserConfig` (#19637) (overlookmotel)

### 📚 Documentation

- b2b7a64 estree/tokens: Correct comment (#19873) (overlookmotel)
- 0399311 estree/tokens: Improve comments (#19836) (overlookmotel)
- 1b392de minifier: Add `Function.prototype.toString` assumption
(#19758) (sapphi-red)
- 75c9cd8 parser: Improve doc comments for `ParserConfig` and
`LexerConfig` (#19682) (overlookmotel)
- 2fa936f README.md: Map npm package links to npmx.dev (#19666) (Boshen)

Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>
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