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Merged
merged 4 commits into from
Jul 12, 2025
Merged

Do not mark OptionalMemberExpresion as LVal #17432

merged 4 commits into from
Jul 12, 2025

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JLHwung
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@JLHwung JLHwung commented Jul 11, 2025 •
edited by nicolo-ribaudo
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Q                       A
Fixed Issues? Fixes #17430, fixes #17434
Patch: Bug Fix? Yes
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass? Yes
Documentation PR Link
Any Dependency Changes?
License MIT

In this PR we remove the OptionalMemberExpression from the LVal alias. The left of the AssignmentExpression still allows OptionalMemberExpression, so the builder usage and the internal typings are generally not affected.

This PR partially reverts #17391.

@JLHwung JLHwung added the PR: Revert ↩️ A type of pull request used for our changelog categories label Jul 11, 2025
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Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/59722

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pkg-pr-new bot commented Jul 11, 2025

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commit: 3bdd2e7

nicolo-ribaudo
nicolo-ribaudo approved these changes Jul 12, 2025
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Releasing this soon!

@nicolo-ribaudo nicolo-ribaudo changed the title Reverts OptionalMemberExpression LVal alias Do not mark OptionalMemberExpresion as LVal Jul 12, 2025
@nicolo-ribaudo nicolo-ribaudo merged commit 8b2e9b4 into babel:main Jul 12, 2025
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@nicolo-ribaudo nicolo-ribaudo deleted the revert-optional-member-expression-lval branch July 12, 2025 08:03
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@JLHwung I just tested 7.28.1 and while the issue I reported in #17434 appears to be resolved, my builds are still failing. They succeed in 7.27.* though. My project is open, you can try it out if it'd help you at all. Here's what I see now on 7.28.1:

error during build:
Cannot add property 0, object is not extensible
    at Array.push (<anonymous>)
    at ConditionalExpression.getLiteralValueAtPath (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:12270:45)
    at file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:5064:30
    at EntityPathTracker.withTrackedEntityAtPath (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:2014:24)
    at LocalVariable.getLiteralValueAtPath (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:5062:33)
    at Identifier.getLiteralValueAtPath (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:5207:48)
    at MemberExpression.getDynamicPropertyKey (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:7636:41)
    at MemberExpression.hasAccessEffect (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:7652:65)
    at MemberExpression.hasEffects (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:7433:18)
    at AssignmentExpression.hasEffects (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:11567:23)
    at ExpressionStatement.hasEffects (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:2809:28)
    at ExpressionStatement.shouldBeIncluded (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:2928:62)
    at ExpressionStatement.shouldBeIncluded (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:6470:22)
    at BlockStatement.include (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:6518:56)
    at includeLoopBody (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:12451:10)
    at WhileStatement.include (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:15421:9)
    at BlockStatement.include (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:6519:26)
    at FunctionDeclaration.include (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:6715:19)
    at FunctionDeclaration.include (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:6809:15)
    at Graph.includeStatements (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:22548:36)
    at Graph.build (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:22487:14)
    at async file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:23172:13
    at async catchUnfinishedHookActions (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:22643:16)
    at async rollupInternal (file:///home/workspaces/node_modules/rollup/dist/es/shared/node-entry.js:23167:5)
    at async buildEnvironment (file:///home/workspaces/node_modules/vite/dist/node/chunks/dep-DBxKXgDP.js:46206:14)
    at async Object.defaultBuildApp [as buildApp] (file:///home/workspaces/node_modules/vite/dist/node/chunks/dep-DBxKXgDP.js:46684:5)
    at async CAC.<anonymous> (file:///home/workspaces/node_modules/vite/dist/node/cli.js:863:7)

@chrisbbreuer chrisbbreuer mentioned this pull request Aug 22, 2025
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7.28.0 Regression on TypeScript transform when passing references OptionalMemberExpressions are being reported as LVal's
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@JLHwung @babel-bot @aldobarr @nicolo-ribaudo @liuxingbaoyu