Microsoft/TypeScript
Union of functions with typed `this`, fails with no parameters
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#41.213 geöffnet am 23.10.2020
BugDomain: This-TypingHelp Wanted
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Beschreibung
TypeScript Version: 4.0.2
Code
interface Context {
hello: boolean
}
type OptionsTest =
| ((this: Context) => void)
| ((this: Context) => PromiseLike<any>)
| ((this: Context, done: boolean) => void)
function container (test: OptionsTest) {
}
// This does not work!
container(function () {
console.log(this.hello);
})
// This works!
container(function (done) {
console.log(this.hello);
})
// This works!
type Single = (this: Context) => void;
function SingleContainer (test: Single) {}
SingleContainer(function () {
console.log(this.hello)
})
Expected behavior:
Correctly provide this type to (typed union) functions without arguments.
Actual behavior:
No this type is being provided for functions without arguments.
Search Terms
- contextually typed
- this parameter
- union of functions