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Bug: Chained this-intersecting methods don't work from within class #28159
Description
TypeScript Version: 3.1.1-insiders.20180926
Search Terms: this chain
Code
class Builder {
private _class: undefined;
withFoo<T>() {
return this as this & { foo: T }
}
withBar<T>() {
return this as this & { bar: T }
}
withFooBar<T>() {
return this.withFoo<T>().withBar<T>();
}
}
let good = new Builder().withFoo<number>().withBar<number>();
let bad = new Builder().withFooBar<number>();
good = bad;Expected behavior:
good & bad should be identical
Actual behavior:
bad is missing foo
Activity
weswigham commentedon Oct 26, 2018
Looking at the quick info for
withFooBar, it would appear that we instantiate thethistype for thewithBarcall in the method body with the class'sthis, rather than the call target (which would bethis & {foo:T}).