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deps: update to cjs-module-lexer@0.5.2 · nodejs/node@1303a1f · GitHub

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deps: update to cjs-module-lexer@0.5.2
PR-URL: #35901 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
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‎deps/cjs-module-lexer/CHANGELOG.md‎

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@@ -1,3 +1,9 @@
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0.5.2
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- Support named getter functions (https://github.com/guybedford/cjs-module-lexer/pull/26)
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0.5.1:
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- Feature: Implement specific reexport getter forms (https://github.com/guybedford/cjs-module-lexer/pull/25)
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0.5.0
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- Breaking Change: No longer emit Object.defineProperty exports (https://github.com/guybedford/cjs-module-lexer/pull/24)
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- Doc: Update link to WASI SDK (https://github.com/guybedford/cjs-module-lexer/pull/19)

‎deps/cjs-module-lexer/README.md‎

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@@ -70,31 +70,35 @@ STRING_LITERAL: A `"` or `'` bounded ECMA-262 string literal.
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IDENTIFIER_STRING: ( `"` IDENTIFIER `"` | `'` IDENTIFIER `'` )
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COMMENT_SPACE: Any ECMA-262 whitespace, ECMA-262 block comment or ECMA-262 line comment
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MODULE_EXPORTS: `module` COMMENT_SPACE `.` COMMENT_SPACE `exports`
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MODULE_EXPORTS: `module` `.` `exports`
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EXPORTS_IDENTIFIER: MODULE_EXPORTS_IDENTIFIER | `exports`
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EXPORTS_DOT_ASSIGN: EXPORTS_IDENTIFIER COMMENT_SPACE `.` COMMENT_SPACE IDENTIFIER COMMENT_SPACE `=`
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EXPORTS_DOT_ASSIGN: EXPORTS_IDENTIFIER `.` IDENTIFIER `=`
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EXPORTS_LITERAL_COMPUTED_ASSIGN: EXPORTS_IDENTIFIER COMMENT_SPACE `[` COMMENT_SPACE IDENTIFIER_STRING COMMENT_SPACE `]` COMMENT_SPACE `=`
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EXPORTS_LITERAL_COMPUTED_ASSIGN: EXPORTS_IDENTIFIER `[` IDENTIFIER_STRING `]` `=`
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EXPORTS_LITERAL_PROP: (IDENTIFIER (COMMENT_SPACE `:` COMMENT_SPACE IDENTIFIER)?) | (IDENTIFIER_STRING COMMENT_SPACE `:` COMMENT_SPACE IDENTIFIER)
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EXPORTS_LITERAL_PROP: (IDENTIFIER `:` IDENTIFIER)?) | (IDENTIFIER_STRING `:` IDENTIFIER)
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EXPORTS_SPREAD: `...` COMMENT_SPACE (IDENTIFIER | REQUIRE)
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EXPORTS_SPREAD: `...` (IDENTIFIER | REQUIRE)
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EXPORTS_MEMBER: EXPORTS_DOT_ASSIGN | EXPORTS_LITERAL_COMPUTED_ASSIGN
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ES_MODULE_DEFINE: `Object` COMMENT_SPACE `.` COMMENT_SPACE `defineProperty COMMENT_SPACE `(` COMMENT_SPACE `__esModule` COMMENT_SPACE `,` COMMENT_SPACE IDENTIFIER_STRING
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EXPORTS_DEFINE: `Object` `.` `defineProperty `(` IDENTIFIER_STRING `, {`
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(`enumerable: true,`)?
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(
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`value:` |
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`get` (`: function` IDENTIFIER? )? `()` {` return IDENTIFIER (`.` IDENTIFIER | `[` IDENTIFIER_STRING `]`)? `;`? `}`
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)
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`})`
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EXPORTS_LITERAL: MODULE_EXPORTS COMMENT_SPACE `=` COMMENT_SPACE `{` COMMENT_SPACE (EXPORTS_LITERAL_PROP | EXPORTS_SPREAD) COMMENT_SPACE `,` COMMENT_SPACE)+ `}`
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EXPORTS_LITERAL: MODULE_EXPORTS `=` `{` (EXPORTS_LITERAL_PROP | EXPORTS_SPREAD) `,`)+ `}`
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REQUIRE: `require` COMMENT_SPACE `(` COMMENT_SPACE STRING_LITERAL COMMENT_SPACE `)`
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REQUIRE: `require` `(` STRING_LITERAL `)`
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EXPORTS_ASSIGN: (`var` | `const` | `let`) IDENTIFIER `=` REQUIRE
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MODULE_EXPORTS_ASSIGN: MODULE_EXPORTS COMMENT_SPACE `=` COMMENT_SPACE REQUIRE
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MODULE_EXPORTS_ASSIGN: MODULE_EXPORTS `=` REQUIRE
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EXPORT_STAR: (`__export` | `__exportStar`) `(` REQUIRE
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@@ -113,9 +117,9 @@ EXPORT_STAR_LIB: `Object.keys(` IDENTIFIER$1 `).forEach(function (` IDENTIFIER$2
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`})`
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```
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* The returned export names are taken to be the combination of:
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1. `IDENTIFIER` and `IDENTIFIER_STRING` slots for all `EXPORTS_MEMBER` and `EXPORTS_LITERAL` matches.
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2. `__esModule` if there is an `ES_MODULE_DEFINE` match.
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Spacing between tokens is taken to be any ECMA-262 whitespace, ECMA-262 block comment or ECMA-262 line comment.
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* The returned export names are taken to be the combination of the `IDENTIFIER` and `IDENTIFIER_STRING` slots for all `EXPORTS_MEMBER`, `EXPORTS_LITERAL` and `EXPORTS_DEFINE` matches.
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* The reexport specifiers are taken to be the the combination of:
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1. The `REQUIRE` matches of the last matched of either `MODULE_EXPORTS_ASSIGN` or `EXPORTS_LITERAL`.
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2. All _top-level_ `EXPORT_STAR` `REQUIRE` matches and `EXPORTS_ASSIGN` matches whose `IDENTIFIER` also matches the first `IDENTIFIER` in `EXPORT_STAR_LIB`.
@@ -156,17 +160,66 @@ It will in turn underclassify in cases where the identifiers are renamed:
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})(exports);
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```
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#### __esModule Detection
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In addition, `__esModule` is detected as an export when set by `Object.defineProperty`:
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`Object.defineProperty` is detected for specifically value and getter forms returning an identifier or member expression:
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```js
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// DETECTS: __esModule
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Object.defineProperty(exports, 'a', { value: 'a' });
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// DETECTS: a, b, c, d, __esModule
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Object.defineProperty(exports, 'a', {
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enumerable: true,
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get: function () {
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return q.p;
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}
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});
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Object.defineProperty(exports, 'b', {
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enumerable: true,
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get: function () {
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return q['p'];
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}
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});
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Object.defineProperty(exports, 'c', {
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enumerable: true,
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get () {
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return b;
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}
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});
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Object.defineProperty(exports, 'd', { value: 'd' });
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Object.defineProperty(exports, '__esModule', { value: true });
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```
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No other named exports are detected for `defineProperty` calls in order not to trigger getters or non-enumerable properties unnecessarily.
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Alternative object definition structures or getter function bodies are not detected:
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```js
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// DETECTS: NO EXPORTS
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Object.defineProperty(exports, 'a', {
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enumerable: false,
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get () {
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return p;
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}
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});
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Object.defineProperty(exports, 'b', {
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configurable: true,
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get () {
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return p;
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}
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});
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Object.defineProperty(exports, 'c', {
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get: () => p
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});
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Object.defineProperty(exports, 'd', {
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enumerable: true,
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get: function () {
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return dynamic();
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}
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});
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Object.defineProperty(exports, 'e', {
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enumerable: true,
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get () {
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return 'str';
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}
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});
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```
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`Object.defineProperties` is also not supported.
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#### Exports Object Assignment
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JS Build:
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```
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--- JS Build ---
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Module load time
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> 2ms
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> 5ms
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Cold Run, All Samples
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test/samples/*.js (3635 KiB)
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> 311ms
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> 323ms
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Warm Runs (average of 25 runs)
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test/samples/angular.js (1410 KiB)
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> 14.76ms
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> 14.84ms
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test/samples/angular.min.js (303 KiB)
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> 5.04ms
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> 4.8ms
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test/samples/d3.js (553 KiB)
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> 7.12ms
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> 7.84ms
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test/samples/d3.min.js (250 KiB)
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> 4ms
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test/samples/magic-string.js (34 KiB)
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> 0.84ms
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> 0.72ms
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test/samples/magic-string.min.js (20 KiB)
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> 0.08ms
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> 0.4ms
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test/samples/rollup.js (698 KiB)
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> 9.08ms
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> 9.32ms
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test/samples/rollup.min.js (367 KiB)
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> 6ms
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> 6.52ms
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Warm Runs, All Samples (average of 25 runs)
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test/samples/*.js (3635 KiB)
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> 41.32ms
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> 44ms
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```
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Wasm Build:
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```
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Module load time
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> 10ms
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> 11ms
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Cold Run, All Samples
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test/samples/*.js (3635 KiB)
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> 47ms
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> 42ms
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Warm Runs (average of 25 runs)
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test/samples/angular.js (1410 KiB)
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> 12.96ms
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> 9.92ms
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test/samples/angular.min.js (303 KiB)
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> 4ms
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> 3.2ms
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test/samples/d3.js (553 KiB)
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> 6.12ms
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> 5.2ms
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test/samples/d3.min.js (250 KiB)
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> 3.08ms
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> 2.52ms
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test/samples/magic-string.js (34 KiB)
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> 0.32ms
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> 0.16ms
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test/samples/magic-string.min.js (20 KiB)
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> 0ms
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> 0.04ms
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test/samples/rollup.js (698 KiB)
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> 7.8ms
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> 6.44ms
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test/samples/rollup.min.js (367 KiB)
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> 4.64ms
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> 3.96ms
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Warm Runs, All Samples (average of 25 runs)
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test/samples/*.js (3635 KiB)
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> 35.64ms
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> 30.48ms
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```
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### Wasm Build Steps

‎deps/cjs-module-lexer/dist/lexer.js‎

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‎deps/cjs-module-lexer/dist/lexer.mjs‎

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‎deps/cjs-module-lexer/lexer.js‎

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@@ -260,30 +260,117 @@ function tryParseObjectDefineOrKeys (keys) {
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pos++;
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ch = commentWhitespace();
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if (ch === 100/*d*/ && source.startsWith('efineProperty', pos + 1)) {
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pos += 14;
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revertPos = pos - 1;
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ch = commentWhitespace();
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if (ch !== 40/*(*/) {
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pos = revertPos;
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return;
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}
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pos++;
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ch = commentWhitespace();
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if (readExportsOrModuleDotExports(ch)) {
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while (true) {
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pos += 14;
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revertPos = pos - 1;
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ch = commentWhitespace();
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if (ch !== 40/*(*/) break;
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pos++;
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ch = commentWhitespace();
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if (!readExportsOrModuleDotExports(ch)) break;
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ch = commentWhitespace();
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if (ch !== 44/*,*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 39/*'*/ && ch !== 34/*"*/) break;
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let quot = ch;
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const exportPos = ++pos;
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if (!identifier() || source.charCodeAt(pos) !== quot) break;
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const expt = source.slice(exportPos, pos);
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pos++;
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ch = commentWhitespace();
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if (ch !== 44/*,*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch === 44/*,*/) {
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if (ch !== 123/*{*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch === 101/*e*/) {
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if (!source.startsWith('numerable', pos + 1)) break;
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pos += 10;
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ch = commentWhitespace();
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if (ch !== 58/*:*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch === 39/*'*/ || ch === 34/*"*/) {
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const exportPos = ++pos;
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if (identifier() && source.charCodeAt(pos) === ch) {
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// revert for "("
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const expt = source.slice(exportPos, pos);
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if (expt === '__esModule')
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addExport(expt);
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}
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if (ch !== 116/*t*/ || !source.startsWith('rue', pos + 1)) break;
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pos += 4;
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ch = commentWhitespace();
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if (ch !== 44) break;
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pos++;
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ch = commentWhitespace();
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}
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if (ch === 118/*v*/) {
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if (!source.startsWith('alue', pos + 1)) break;
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pos += 5;
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ch = commentWhitespace();
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if (ch !== 58/*:*/) break;
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pos++;
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addExport(expt);
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break;
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}
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else if (ch === 103/*g*/) {
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if (!source.startsWith('et', pos + 1)) break;
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pos += 3;
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ch = commentWhitespace();
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if (ch === 58/*:*/) {
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pos++;
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ch = commentWhitespace();
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if (ch !== 102/*f*/) break;
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if (!source.startsWith('unction', pos + 1)) break;
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pos += 8;
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let lastPos = pos;
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ch = commentWhitespace();
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if (ch !== 40 && (lastPos === pos || !identifier())) break;
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ch = commentWhitespace();
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}
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if (ch !== 40/*(*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 41/*)*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 123/*{*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 114/*r*/) break;
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if (!source.startsWith('eturn', pos + 1)) break;
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pos += 6;
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ch = commentWhitespace();
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if (!identifier()) break;
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ch = commentWhitespace();
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if (ch === 46/*.*/) {
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pos++;
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commentWhitespace();
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if (!identifier()) break;
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ch = commentWhitespace();
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}
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else if (ch === 91/*[*/) {
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pos++;
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ch = commentWhitespace();
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if (ch === 39/*'*/) singleQuoteString();
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else if (ch === 34/*"*/) doubleQuoteString();
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else break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 93/*]*/) break;
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pos++;
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ch = commentWhitespace();
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}
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if (ch === 59/*;*/) {
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pos++;
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ch = commentWhitespace();
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}
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if (ch !== 125/*}*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 125/*}*/) break;
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pos++;
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ch = commentWhitespace();
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if (ch !== 41/*)*/) break;
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addExport(expt);
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return;
286372
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break;
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‎deps/cjs-module-lexer/package.json‎

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{
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"name": "cjs-module-lexer",
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"version": "0.5.0",
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"version": "0.5.2",
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"description": "Lexes CommonJS modules, returning their named exports metadata",
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"main": "lexer.js",
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"exports": {

‎doc/api/esm.md‎

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[`transformSource` hook]: #esm_transformsource_source_context_defaulttransformsource
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[`string`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
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[`util.TextDecoder`]: util.md#util_class_util_textdecoder
1290-
[cjs-module-lexer]: https://github.com/guybedford/cjs-module-lexer/tree/0.5.0
1290+
[cjs-module-lexer]: https://github.com/guybedford/cjs-module-lexer/tree/0.5.2
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[special scheme]: https://url.spec.whatwg.org/#special-scheme
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[the official standard format]: https://tc39.github.io/ecma262/#sec-modules
12931293
[transpiler loader example]: #esm_transpiler_loader

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