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Rule proposal: restrict-constructor-expressions #10895

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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
@karlhorky

Description

@karlhorky

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

Similar torestrict-template-expressions, the new rulerestrict-constructor-expressions restrict the types of expressions passed to constructors such asNumber() andString() to a subset which result in non-surprising return values

TypeScript types for constructors have a permissiveany type for the parameters:

TypeScript playground showing that the Number constructor has a parameter type of 'any'
TypeScript playground showing that the String constructor has a parameter type of 'any'

Fail Cases

Number({stdout:'123'})// NaNNumber(['2'])// 2String({result:123})// '[object Object]'// I'm guessing there are many more...

Pass Cases

Number({stdout:'123'}.stdout)// 123Number(['2'][0])// 2String({result:123}.result)// '123'

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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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