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Callable types are not validated properly #40270
Description
TypeScript Version: 4.0.2
Search Terms:
callable
Code
type Retrieve = () => {
extracted?: string
raw: string
}
const retrieve: Retrieve = () => {
return {
raw: 'mhm',
extracted: 'aha',
a: 1, // no error for this extra prop
}
}
interface RetrieveInterface {
(): {
extracted?: string
raw: string
}
}
const retrieveInterface: RetrieveInterface = () => {
return {
raw: 'mhm',
extracted: 'aha',
a: 1, // no error for this extra prop
}
}Expected behavior:
get same error as setting return type to arrow function
const retrieve = (): {
extracted?: string
raw: string
} => {
return {
raw: 'mhm',
extracted: 'aha',
a: 1,
}
}
Actual behavior:
no error
Related Issues:
Maybe I hit same as on going discussion here -> #241
Activity
DanielRosenwasser commentedon Sep 2, 2020
Duplicate of #241, but I have a potential fix. Check out #40311 (comment)
typescript-bot commentedon Sep 4, 2020
This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.