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Rule proposal: preferawait voidPromise overreturn voidPromise #10987

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enhancement: new plugin ruleNew rule request for eslint-pluginevaluating community engagementwe're looking for community engagement on this issue to show that this problem is widely importantpackage: eslint-pluginIssues related to @typescript-eslint/eslint-plugin
@fregante

Description

@fregante

Before You File a Proposal Please Confirm You Have Done The Following...

My proposal is suitable for this project

  • My proposal specifically checks TypeScript syntax, or it proposes a check that requires type information to be accurate.
  • My proposal is not a "formatting rule"; meaning it does not just enforce how code is formatted (whitespace, brace placement, etc).
  • I believe my proposal would be useful to the broader TypeScript community (meaning it is not a niche proposal).

Description

The rule is similar tohttps://typescript-eslint.io/rules/no-confusing-void-expression.

I've found code thatreturns promises that result invoid. The intent in that case is toawait the promise, not to return its value.

Fail Cases

asyncfunctionfoo(){returnnewPromise(resolve=>setTimeout(resolve))}asyncfunctionfoo(){constdeferred=Promise.withResolvers<undefined>();deferred.resolve(undefined);returndeferred.promise;}

Pass Cases

asyncfunctionfoo(){awaitnewPromise(resolve=>setTimeout(resolve))}asyncfunctionfoo(){constdeferred=Promise.withResolvers<undefined>();deferred.resolve(undefined);awaitdeferred.promise;}

Additional Info

I can't think of a situation where you'd want toreturn avoid since the expression is equivalent to:

functionfoo(){returnundefined;}

an exception may or may not be made for promise-returning sync functions:

functionfoo(){returnPromise.resolve()}

But those are covered bypromise-function-async

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    enhancement: new plugin ruleNew rule request for eslint-pluginevaluating community engagementwe're looking for community engagement on this issue to show that this problem is widely importantpackage: eslint-pluginIssues related to @typescript-eslint/eslint-plugin

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