Avoid unnecessary parens around sequence expressions#16722
Avoid unnecessary parens around sequence expressions#16722nicolo-ribaudo merged 5 commits intobabel:mainfrom
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It seems like the old behavior is better here.
Although we don't guarantee formatting by default, it would be nice if we could preserve the formatting for this case.
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In most cases where parentheses don't matter we drop them, for example https://babeljs.io/repl#?browsers=defaults%2C%20not%20ie%2011%2C%20not%20ie_mob%2011&build=&builtIns=false&corejs=3.21&spec=false&loose=false&code_lz=BQQwBAPhYEYJSWgYwNwChxTMGixLiA&debug=false&forceAllTransforms=false&modules=false&shippedProposals=false&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env%2Creact%2Cstage-2&prettier=false&targets=&version=7.25.3&externalPlugins=&assumptions=%7B%7D
In general, people that care about parentheses should enable the createParenthesizedExpression option.
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I'm still a little concerned that this removes one node from the AST tree, but now I think this is OK.
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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/tree/HEAD/packages/babel-traverse)) | resolutions | minor | [`7.24.8` -> `7.25.6`](https://renovatebot.com/diffs/npm/@babel%2ftraverse/7.24.8/7.25.6) | --- ### Release Notes <details> <summary>babel/babel (@​babel/traverse)</summary> ### [`v7.25.6`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7256-2024-08-29) [Compare Source](babel/babel@v7.25.4...v7.25.6) ##### 🐛 Bug Fix - `babel-generator` - [#​16783](babel/babel#16783) Properly print inner comments in TS array types ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - [#​16775](babel/babel#16775) fix: jsx whitespace is not properly preserved when retainLines ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-traverse` - [#​16727](babel/babel#16727) fix: `path.getAssignmentIdentifiers` may be `undefined` ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-parser` - [#​16761](babel/babel#16761) fix: improve static canFollowModifier checks ([@​JLHwung](https://github.com/JLHwung)) - `babel-helpers`, `babel-plugin-transform-optional-chaining`, `babel-runtime-corejs3` - [#​16769](babel/babel#16769) Only wrap functions in `superPropertyGet` helper ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 💅 Polish - `babel-generator`, `babel-plugin-transform-async-to-generator`, `babel-plugin-transform-block-scoping`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes`, `babel-plugin-transform-duplicate-named-capturing-groups-regex`, `babel-plugin-transform-named-capturing-groups-regex`, `babel-plugin-transform-react-jsx-development`, `babel-plugin-transform-react-jsx`, `babel-plugin-transform-react-pure-annotations`, `babel-plugin-transform-regenerator`, `babel-plugin-transform-runtime`, `babel-preset-env` - [#​16780](babel/babel#16780) Do not enforce printing space between `(` and comments ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-plugin-syntax-import-assertions`, `babel-plugin-syntax-import-attributes` - [#​16781](babel/babel#16781) Don't throw when enabling both syntax-import-{assertions,attributes} ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-generator` - [#​16782](babel/babel#16782) TS union/intersection nested in union does not need parens ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏠 Internal - `babel-generator` - [#​16777](babel/babel#16777) Remove unused `parent` params in the generator ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ### [`v7.25.4`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7254-2024-08-22) [Compare Source](babel/babel@v7.25.3...v7.25.4) ##### 🐛 Bug Fix - `babel-traverse` - [#​16756](babel/babel#16756) fix: Skip computed key when renaming ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-plugin-proposal-decorators` - [#​16755](babel/babel#16755) fix: Decorator 2018-09 may throw an exception ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-types` - [#​16710](babel/babel#16710) Visit AST fields nodes according to their syntactical order ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-generator` - [#​16709](babel/babel#16709) Print semicolon after TS `export namespace as A` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 💅 Polish - `babel-generator`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-destructuring-private`, `babel-plugin-proposal-pipeline-operator`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-destructuring`, `babel-plugin-transform-optional-chaining`, `babel-plugin-transform-private-methods`, `babel-plugin-transform-private-property-in-object`, `babel-plugin-transform-typescript`, `babel-runtime-corejs2`, `babel-runtime`, `babel-traverse` - [#​16722](babel/babel#16722) Avoid unnecessary parens around sequence expressions ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-generator`, `babel-plugin-transform-class-properties` - [#​16714](babel/babel#16714) Avoid unnecessary parens around exported arrow functions ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-generator`, `babel-plugin-proposal-decorators`, `babel-plugin-proposal-destructuring-private`, `babel-plugin-transform-object-rest-spread` - [#​16712](babel/babel#16712) Avoid printing unnecessary parens around object destructuring ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🔬 Output optimization - `babel-generator` - [#​16740](babel/babel#16740) Avoid extra spaces between comments/regexps in compact mode ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ### [`v7.25.3`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7253-2024-07-31) [Compare Source](babel/babel@v7.25.2...v7.25.3) ##### 🐛 Bug Fix - `babel-plugin-bugfix-firefox-class-in-computed-class-key`, `babel-traverse` - [#​16699](babel/babel#16699) Avoid validating visitors produced by `traverse.visitors.merge` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏠 Internal - `babel-parser` - [#​16688](babel/babel#16688) Add `@babel/types` as a dependency of `@babel/parser` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ### [`v7.25.2`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7252-2024-07-30) [Compare Source](babel/babel@v7.25.1...v7.25.2) ##### 🐛 Bug Fix - `babel-core`, `babel-traverse` - [#​16695](babel/babel#16695) Ensure that `requeueComputedKeyAndDecorators` is available ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ### [`v7.25.1`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7251-2024-07-28) [Compare Source](babel/babel@v7.25.0...v7.25.1) ##### 🐛 Bug Fix - `babel-plugin-transform-function-name` - [#​16683](babel/babel#16683) fix: `ensureFunctionName` may be undefined ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-plugin-transform-react-constant-elements` - [#​16582](babel/babel#16582) fix plugin-transform-react-constant-elements transform JSXFrament but not add JSXExpressionContainer ([@​keiseiTi](https://github.com/keiseiTi)) - `babel-traverse` - [#​16587](babel/babel#16587) fix: fixed issue16583 + test ([@​nerodesu017](https://github.com/nerodesu017)) ##### 🏠 Internal - [#​16663](babel/babel#16663) Test eslint plugin against eslint 9 ([@​JLHwung](https://github.com/JLHwung)) ### [`v7.25.0`](https://github.com/babel/babel/blob/HEAD/CHANGELOG.md#v7250-2024-07-26) [Compare Source](babel/babel@v7.24.8...v7.25.0) ##### 👓 Spec Compliance - `babel-helpers`, `babel-plugin-proposal-explicit-resource-management`, `babel-runtime-corejs3` - [#​16537](babel/babel#16537) `await using` normative updates ([@​JLHwung](https://github.com/JLHwung)) - `babel-plugin-transform-typescript` - [#​16602](babel/babel#16602) Ensure enum members syntactically determinable to be strings do not get reverse mappings ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) ##### 🚀 New Feature - `babel-helper-create-class-features-plugin`, `babel-helper-function-name`, `babel-helper-plugin-utils`, `babel-helper-wrap-function`, `babel-plugin-bugfix-safari-class-field-initializer-scope`, `babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression`, `babel-plugin-transform-classes`, `babel-plugin-transform-function-name`, `babel-preset-env`, `babel-traverse`, `babel-types` - [#​16658](babel/babel#16658) Move `ensureFunctionName` to `NodePath.prototype` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-hoist-variables`, `babel-helper-plugin-utils`, `babel-plugin-proposal-async-do-expressions`, `babel-plugin-transform-modules-systemjs`, `babel-traverse` - [#​16644](babel/babel#16644) Move `hoistVariables` to `Scope.prototype` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helper-module-transforms`, `babel-helper-plugin-utils`, `babel-helper-split-export-declaration`, `babel-plugin-transform-classes`, `babel-traverse`, `babel-types` - [#​16645](babel/babel#16645) Move `splitExportDeclaration` to `NodePath.prototype` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-create-class-features-plugin`, `babel-helper-environment-visitor`, `babel-helper-module-transforms`, `babel-helper-plugin-utils`, `babel-helper-remap-async-to-generator`, `babel-helper-replace-supers`, `babel-plugin-bugfix-firefox-class-in-computed-class-key`, `babel-plugin-bugfix-v8-static-class-fields-redefine-readonly`, `babel-plugin-transform-async-generator-functions`, `babel-plugin-transform-classes`, `babel-traverse` - [#​16649](babel/babel#16649) Move `environment-visitor` helper into `@babel/traverse` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-core`, `babel-parser` - [#​16480](babel/babel#16480) Expose wether a module has TLA or not as `.extra.async` ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-compat-data`, `babel-plugin-bugfix-safari-class-field-initializer-scope`, `babel-preset-env` - [#​16569](babel/babel#16569) Introduce `bugfix-safari-class-field-initializer-scope` ([@​davidtaylorhq](https://github.com/davidtaylorhq)) - `babel-plugin-transform-block-scoping`, `babel-traverse`, `babel-types` - [#​16551](babel/babel#16551) Add `NodePath#getAssignmentIdentifiers` ([@​JLHwung](https://github.com/JLHwung)) - `babel-helper-import-to-platform-api`, `babel-plugin-proposal-json-modules` - [#​16579](babel/babel#16579) Add `uncheckedRequire` option for JSON imports to CJS ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-transform-fixture-test-runner`, `babel-node` - [#​16642](babel/babel#16642) Allow using custom config in `babel-node --eval` ([@​slatereax](https://github.com/slatereax)) - `babel-compat-data`, `babel-helper-create-regexp-features-plugin`, `babel-plugin-proposal-duplicate-named-capturing-groups-regex`, `babel-plugin-transform-duplicate-named-capturing-groups-regex`, `babel-preset-env`, `babel-standalone` - [#​16445](babel/babel#16445) Add `duplicate-named-capturing-groups-regex` to `preset-env` ([@​JLHwung](https://github.com/JLHwung)) ##### 🐛 Bug Fix - `babel-generator` - [#​16678](babel/babel#16678) Print parens around as expressions on the LHS ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-template`, `babel-types` - [#​15286](babel/babel#15286) fix: Props are lost when the template replaces the node ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) ##### 🏠 Internal - Other - [#​16674](babel/babel#16674) bump gulp to 5 ([@​JLHwung](https://github.com/JLHwung)) - `babel-generator` - [#​16651](babel/babel#16651) Simplify the printing logic for `(` before ambiguous tokens ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) - `babel-helper-function-name`, `babel-plugin-transform-arrow-functions`, `babel-plugin-transform-function-name`, `babel-preset-env`, `babel-traverse` - [#​16652](babel/babel#16652) Simplify `helper-function-name` logic ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) ##### 🏃♀️ Performance - `babel-parser`, `babel-plugin-proposal-pipeline-operator` - [#​16461](babel/babel#16461) Some minor parser performance improvements for ts ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) ##### 🔬 Output optimization - `babel-plugin-transform-classes` - [#​16670](babel/babel#16670) Reduce redundant `assertThisInitialized` ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-helper-create-class-features-plugin`, `babel-helper-replace-supers`, `babel-helpers`, `babel-plugin-proposal-decorators`, `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes`, `babel-plugin-transform-exponentiation-operator`, `babel-plugin-transform-object-super`, `babel-plugin-transform-private-methods`, `babel-runtime-corejs2`, `babel-runtime-corejs3`, `babel-runtime` - [#​16374](babel/babel#16374) Improve `super.x` output ([@​liuxingbaoyu](https://github.com/liuxingbaoyu)) - `babel-plugin-transform-class-properties`, `babel-plugin-transform-classes` - [#​16656](babel/babel#16656) Simplify output for anonymous classes with no methods ([@​nicolo-ribaudo](https://github.com/nicolo-ribaudo)) </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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Fixes #1, Fixes #2The new logic is based on checking in the spec which places allow
Expressions. The general rule is that SequenceExpressions are allowed in all statements (except forclass extends) and in no expressions (except for parenthesized expressions, other sequence expressions, template substitutions, and computed keys in member expressions).