Optimize the use of `assertThisInitialized` after `super()` #16345

liuxingbaoyu · 2024-03-12T17:05:46Z

Q	A
Fixed Issues?	Closes #8405
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

As we optimized possibleConstructorReturn, this PR reduces the use of assertThisInitialized.
Although this only works in simple super() positions, this should be enough.

babel-bot · 2024-03-12T17:07:52Z

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/56499

nicolo-ribaudo

Closes #8405

Do we already have these tests?

super(this);

if (dynamic()) super();
this;

liuxingbaoyu · 2024-03-12T17:18:45Z

I'm not sure, I added them. :)
~~super(this) seems incorrect? But the main branch is also like this.~~

liuxingbaoyu · 2024-03-12T17:21:14Z

packages/babel-plugin-transform-classes/test/fixtures/spec/accessing-super-class/output.js

+    babelHelpers.get((_thisSuper2 = _this, babelHelpers.getPrototypeOf(Test.prototype)), "test", _thisSuper2).apply(_thisSuper2, arguments);
+    (_babelHelpers$get = babelHelpers.get((_thisSuper3 = _this, babelHelpers.getPrototypeOf(Test.prototype)), "test", _thisSuper3)).call.apply(_babelHelpers$get, [_thisSuper3, "test"].concat(Array.prototype.slice.call(arguments)));


The output here doesn't look very good, we can optimize them later.

nicolo-ribaudo · 2024-03-12T17:23:00Z

super(this) seems to be correct both in main and in this PR: it throws, because this is evaluated before calling super.

liuxingbaoyu · 2024-03-12T17:24:31Z

Thanks! I made a mistake. :)

nicolo-ribaudo · 2024-03-12T17:24:33Z

...-transform-class-properties/test/fixtures/nested-class/super-property-in-decorator/output.js

@@ -24,7 +24,7 @@ let Outer = /*#__PURE__*/function (_Hello) {
      _init_extra_hello(this);
    });
    _Inner = Inner;
-    [_init_hello, _init_extra_hello] = babelHelpers.applyDecs2311(_Inner, [], [[babelHelpers.get((_thisSuper = babelHelpers.assertThisInitialized(_this), babelHelpers.getPrototypeOf(Outer.prototype)), "dec", _thisSuper), 0, "hello"]]).e;
+    [_init_hello, _init_extra_hello] = babelHelpers.applyDecs2311(_Inner, [], [[babelHelpers.get((_thisSuper = _this, babelHelpers.getPrototypeOf(Outer.prototype)), "dec", _thisSuper), 0, "hello"]]).e;


It would be great to avoid the _thisSuper variable and just use _this, but I'm not sure if that's actually possible.

I submitted a new commit, not sure if this is OK, but it currently passes the existing tests. :)

The thisSuper was introduced in #11480, to ensure the this binding is resolved before the computed property is evaluated. As long as we have called _assertThisInitialized on the this expression before, it seems okay to remove the thisSuper.

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [@babel/traverse](https://babel.dev/docs/en/next/babel-traverse) ([source](https://github.com/babel/babel)) | resolutions | minor | [`7.23.9` -> `7.24.1`](https://renovatebot.com/diffs/npm/@babel%2ftraverse/7.23.9/7.24.1) | --- ### Release Notes <details> <summary>babel/babel (@babel/traverse)</summary> ### [`v7.24.1`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7241-2024-03-19) [Compare Source](babel/babel@v7.24.0...v7.24.1) ##### 🐛 Bug Fix - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#16350](babel/babel#16350) Fix decorated class computed keys ordering ([@JLHwung](https://github.com/JLHwung)) - [#16344](babel/babel#16344) Fix decorated class static field private access ([@JLHwung](https://github.com/JLHwung)) - `babel-plugin-proposal-decorators`, `babel-plugin-proposal-json-modules`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-preset-env` - [#16329](babel/babel#16329) Respect `moduleName` for `@babel/runtime/regenerator` imports ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-class-properties` - [#16331](babel/babel#16331) Fix decorator memoiser binding kind ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-helper-replace-supers`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties` - [#16325](babel/babel#16325) Fix decorator evaluation private environment ([@JLHwung](https://github.com/JLHwung)) ##### 📝 Documentation - [#16319](babel/babel#16319) Update SECURITY.md ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏠 Internal - `babel-code-frame`, `babel-highlight` - [#16359](babel/babel#16359) Replace `chalk` with `picocolors` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-fixtures`, `babel-helpers`, `babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-unicode-sets-regex`, `babel-preset-env`, `babel-preset-flow` - [#16352](babel/babel#16352) Run Babel transform tests on old node if possible ([@JLHwung](https://github.com/JLHwung)) - `babel-helpers`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-class-static-block`, `babel-plugin-transform-modules-commonjs`, `babel-plugin-transform-modules-systemjs`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-preset-env`, `babel-runtime-corejs3`, `babel-runtime`, `babel-standalone` - [#16323](babel/babel#16323) Allow separate helpers to be excluded in Babel 8 ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-module-imports`, `babel-plugin-proposal-import-wasm-source`, `babel-plugin-proposal-json-modules`, `babel-plugin-proposal-record-and-tuple`, `babel-plugin-transform-react-jsx-development`, `babel-plugin-transform-react-jsx` - [#16349](babel/babel#16349) Support merging imports in import injector ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression`, `babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining`, `babel-plugin-bugfix-v8-static-class-fields-redefine-readonly`, `babel-plugin-external-helpers`, `babel-plugin-proposal-async-do-expressions`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-destructuring-private`, `babel-plugin-proposal-do-expressions`, `babel-plugin-proposal-duplicate-named-capturing-groups-regex`, `babel-plugin-proposal-explicit-resource-management`, `babel-plugin-proposal-export-default-from`, `babel-plugin-proposal-function-bind`, `babel-plugin-proposal-function-sent`, `babel-plugin-proposal-import-attributes-to-assertions`, `babel-plugin-proposal-import-defer`, `babel-plugin-proposal-import-wasm-source`, `babel-plugin-proposal-json-modules`, `babel-plugin-proposal-optional-chaining-assign`, `babel-plugin-proposal-partial-application`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-proposal-record-and-tuple`, `babel-plugin-proposal-regexp-modifiers`, `babel-plugin-proposal-throw-expressions`, `babel-plugin-syntax-async-do-expressions`, `babel-plugin-syntax-decimal`, `babel-plugin-syntax-decorators`, `babel-plugin-syntax-destructuring-private`, `babel-plugin-syntax-do-expressions`, `babel-plugin-syntax-explicit-resource-management`, `babel-plugin-syntax-export-default-from`, `babel-plugin-syntax-flow`, `babel-plugin-syntax-function-bind`, `babel-plugin-syntax-function-sent`, `babel-plugin-syntax-import-assertions`, `babel-plugin-syntax-import-attributes`, `babel-plugin-syntax-import-defer`, `babel-plugin-syntax-import-reflection`, `babel-plugin-syntax-import-source`, `babel-plugin-syntax-jsx`, `babel-plugin-syntax-module-blocks`, `babel-plugin-syntax-optional-chaining-assign`, `babel-plugin-syntax-partial-application`, `babel-plugin-syntax-pipeline-operator`, `babel-plugin-syntax-record-and-tuple`, `babel-plugin-syntax-throw-expressions`, `babel-plugin-syntax-typescript`, `babel-plugin-transform-arrow-functions`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-async-to-generator`, `babel-plugin-transform-block-scoped-functions`, `babel-plugin-transform-block-scoping`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-class-static-block`, `babel-plugin-transform-classes`, `babel-plugin-transform-computed-properties`, `babel-plugin-transform-destructuring`, `babel-plugin-transform-dotall-regex`, `babel-plugin-transform-duplicate-keys`, `babel-plugin-transform-dynamic-import`, `babel-plugin-transform-exponentiation-operator`, `babel-plugin-transform-export-namespace-from`, `babel-plugin-transform-flow-comments`, `babel-plugin-transform-flow-strip-types`, `babel-plugin-transform-for-of`, `babel-plugin-transform-function-name`, `babel-plugin-transform-instanceof`, `babel-plugin-transform-jscript`, `babel-plugin-transform-json-strings`, `babel-plugin-transform-literals`, `babel-plugin-transform-logical-assignment-operators`, `babel-plugin-transform-member-expression-literals`, `babel-plugin-transform-modules-amd`, `babel-plugin-transform-modules-commonjs`, `babel-plugin-transform-modules-systemjs`, `babel-plugin-transform-modules-umd`, `babel-plugin-transform-new-target`, `babel-plugin-transform-nullish-coalescing-operator`, `babel-plugin-transform-numeric-separator`, `babel-plugin-transform-object-assign`, `babel-plugin-transform-object-rest-spread`, `babel-plugin-transform-object-set-prototype-of-to-assign`, `babel-plugin-transform-object-super`, `babel-plugin-transform-optional-catch-binding`, `babel-plugin-transform-optional-chaining`, `babel-plugin-transform-parameters`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-property-literals`, `babel-plugin-transform-property-mutators`, `babel-plugin-transform-proto-to-assign`, `babel-plugin-transform-react-constant-elements`, `babel-plugin-transform-react-display-name`, `babel-plugin-transform-react-inline-elements`, `babel-plugin-transform-react-jsx-compat`, `babel-plugin-transform-react-jsx-self`, `babel-plugin-transform-react-jsx-source`, `babel-plugin-transform-react-pure-annotations`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-reserved-words`, `babel-plugin-transform-runtime`, `babel-plugin-transform-shorthand-properties`, `babel-plugin-transform-spread`, `babel-plugin-transform-sticky-regex`, `babel-plugin-transform-strict-mode`, `babel-plugin-transform-template-literals`, `babel-plugin-transform-typeof-symbol`, `babel-plugin-transform-typescript`, `babel-plugin-transform-unicode-escapes`, `babel-plugin-transform-unicode-property-regex`, `babel-plugin-transform-unicode-regex`, `babel-plugin-transform-unicode-sets-regex`, `babel-preset-env`, `babel-preset-flow`, `babel-preset-react`, `babel-preset-typescript` - [#16332](babel/babel#16332) Test Babel 7 plugins compatibility with Babel 8 core ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-compat-data`, `babel-plugin-transform-object-rest-spread`, `babel-preset-env` - [#16318](babel/babel#16318) \[babel 8] Fix `@babel/compat-data` package.json ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🔬 Output optimization - `babel-helper-replace-supers`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes`, `babel-plugin-transform-parameters`, `babel-plugin-transform-runtime` - [#16345](babel/babel#16345) Optimize the use of `assertThisInitialized` after `super()` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes` - [#16343](babel/babel#16343) Use simpler `assertThisInitialized` more often ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-object-rest-spread`, `babel-traverse` - [#16342](babel/babel#16342) Consider well-known and registered symbols as literals ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-core`, `babel-plugin-external-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-function-bind`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes`, `babel-plugin-transform-flow-comments`, `babel-plugin-transform-flow-strip-types`, `babel-plugin-transform-function-name`, `babel-plugin-transform-modules-systemjs`, `babel-plugin-transform-parameters`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-react-jsx`, `babel-plugin-transform-runtime`, `babel-plugin-transform-spread`, `babel-plugin-transform-typescript`, `babel-preset-env` - [#16326](babel/babel#16326) Reduce the use of class names ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) ### [`v7.24.0`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7240-2024-02-28) [Compare Source](babel/babel@v7.23.9...v7.24.0) ##### 🚀 New Feature - `babel-standalone` - [#11696](babel/babel#11696) Export babel tooling packages in `@babel/standalone` ([@ajihyf](https://github.com/ajihyf)) - `babel-core`, `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-transform-class-properties` - [#16267](babel/babel#16267) Implement `noUninitializedPrivateFieldAccess` assumption ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-syntax-decorators`, `babel-plugin-transform-class-properties`, `babel-runtime-corejs2`, `babel-runtime-corejs3`, `babel-runtime` - [#16242](babel/babel#16242) Support decorator 2023-11 normative updates ([@JLHwung](https://github.com/JLHwung)) - `babel-preset-flow` - [#16309](babel/babel#16309) \[babel 7] Allow setting `ignoreExtensions` in Flow preset ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#16284](babel/babel#16284) Add `experimental_useHermesParser` option in `preset-flow` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-import-to-platform-api`, `babel-plugin-proposal-import-wasm-source`, `babel-plugin-proposal-json-modules`, `babel-standalone` - [#16172](babel/babel#16172) Add transform support for JSON modules imports ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-plugin-transform-runtime` - [#16241](babel/babel#16241) Add back `moduleName` option to `@babel/plugin-transform-runtime` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-parser`, `babel-types` - [#16277](babel/babel#16277) Allow import attributes for `TSImportType` ([@sosukesuzuki](https://github.com/sosukesuzuki)) ##### 🐛 Bug Fix - `babel-plugin-proposal-do-expressions`, `babel-traverse` - [#16305](babel/babel#16305) fix: avoid `popContext` on unvisited node paths ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object` - [#16312](babel/babel#16312) Fix class private properties when `privateFieldsAsSymbols` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-transform-private-methods` - [#16307](babel/babel#16307) Fix the support of `arguments` in private `get/set` method ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators` - [#16287](babel/babel#16287) Reduce decorator static property size ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#16281](babel/babel#16281) Fix evaluation order of decorators with cached receiver ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#16279](babel/babel#16279) Fix decorator this memoization ([@JLHwung](https://github.com/JLHwung)) - [#16266](babel/babel#16266) Preserve `static` on decorated private `accessor` ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#16258](babel/babel#16258) fix: handle decorated async private method and generator ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-typescript`, `babel-preset-env` - [#16275](babel/babel#16275) Fix class private properties when `privateFieldsAsProperties` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helpers` - [#16268](babel/babel#16268) Do not consider `arguments` in a helper as a global reference ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helpers`, `babel-plugin-proposal-decorators` - [#16270](babel/babel#16270) Handle symbol key class elements decoration ([@JLHwung](https://github.com/JLHwung)) - [#16265](babel/babel#16265) Do not define `access.get` for public setter decorators ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 💅 Polish - `babel-core`, `babel-helper-create-class-features-plugin`, `babel-preset-env` - [#12428](babel/babel#12428) Suggest using `BABEL_SHOW_CONFIG_FOR` for config problems ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏠 Internal - `babel-helper-transform-fixture-test-runner` - [#16278](babel/babel#16278) Continue writing `output.js` when `exec.js` throws ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) ##### 🔬 Output optimization - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#16306](babel/babel#16306) Avoid intermediate functions for private accessors with decs ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-class-properties` - [#16294](babel/babel#16294) More aggressively inline decorators in the static block ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-transform-private-methods` - [#16283](babel/babel#16283) Do not use `classPrivateMethodGet` ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-helpers`, `babel-plugin-proposal-decorators` - [#16287](babel/babel#16287) Reduce decorator static property size ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties` - [#16280](babel/babel#16280) Reduce element decorator temp variables ([@JLHwung](https://github.com/JLHwung)) - `babel-helper-create-class-features-plugin`, `babel-helper-fixtures`, `babel-helpers`, `babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-destructuring-private`, `babel-plugin-proposal-optional-chaining-assign`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-class-static-block`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-preset-env`, `babel-runtime-corejs2`, `babel-runtime-corejs3`, `babel-runtime` - [#16261](babel/babel#16261) Do not use descriptors for private class elements ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helpers`, `babel-plugin-proposal-decorators` - [#16263](babel/babel#16263) Reduce helper size for decorator 2023-11 ([@liuxingbaoyu](https://github.com/liuxingbaoyu)) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. 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liuxingbaoyu added Spec: Classes PR: Output optimization 🔬 A type of pull request used for our changelog categories labels Mar 12, 2024

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add tests

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remove thisSuper

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liuxingbaoyu requested a review from JLHwung March 14, 2024 19:20

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JLHwung merged commit da821bd into babel:main Mar 14, 2024
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Optimize the use of `assertThisInitialized` after `super()` #16345

Optimize the use of `assertThisInitialized` after `super()` #16345

liuxingbaoyu commented Mar 12, 2024 •

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JLHwung Mar 14, 2024

		babelHelpers.get((_thisSuper2 = _this, babelHelpers.getPrototypeOf(Test.prototype)), "test", _thisSuper2).apply(_thisSuper2, arguments);
		(_babelHelpers$get = babelHelpers.get((_thisSuper3 = _this, babelHelpers.getPrototypeOf(Test.prototype)), "test", _thisSuper3)).call.apply(_babelHelpers$get, [_thisSuper3, "test"].concat(Array.prototype.slice.call(arguments)));

Optimize the use of assertThisInitialized after super() #16345

Optimize the use of assertThisInitialized after super() #16345

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Optimize the use of `assertThisInitialized` after `super()` #16345

Optimize the use of `assertThisInitialized` after `super()` #16345

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