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Description
Before You File a Proposal Please Confirm You Have Done The Following...
- I have searched for related issues and found none that match my proposal.
- I have searched the current rule list and found no rules that match my proposal.
- I have read the FAQ and my problem is not listed.
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 to restrict-template-expressions
, the new rule restrict-constructor-expressions
restrict the types of expressions passed to constructors such as Number()
and String()
to a subset which result in non-surprising return values
TypeScript types for constructors have a permissive any
type for the parameters:
Fail Cases
Number({stdout: '123'}) // NaN
Number(['2']) // 2
String({result: 123}) // '[object Object]'
// I'm guessing there are many more...
Pass Cases
Number({stdout: '123'}.stdout) // 123
Number(['2'][0]) // 2
String({result: 123}.result) // '123'
Additional Info
No response