Parses invalid yield in for-in statement
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Description
When a
yield(@mikesherov ) appears within the Initializer of an AssignmentElement outside of a generator function body, it behaves as an IdentifierReference. (For..in statement)
Steps to reproduce
esprima.parse('for ([ x = yield ] in [[]]) ;')
Expected output
Should throw
Actual output
Parses invalid AST
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the esprima.parse reproduction shown in the issue and trace how the parser handles yield inside the for-in initializer. Confirm that the invalid input throws instead of producing an AST, and use the reproduction to verify the completed behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 45/100