microsoft / microsoft/TypeScript
[Request] Warn on void && Short circuit
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Suggestion
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Description
Suggestion
Typescript should warn that expr will never be evaluated in the following
void [condition] && [expr]
Example
const bar = () => void condition && foo();
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 by reviewing the TypeScript compiler's existing diagnostics for unreachable or unevaluated expressions and the typechecker behavior for the void [condition] && [expr] example. Determine how the warning should apply without incorrectly flagging valid expressions. Done means the compiler reports the intended warning for the example and tests cover the diagnostic behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100