2533d8294e
* Forbid inferable index checkign during subtype relationship checking * Merge object.values and object.entries overloads to work around subtype change * Invert subtype relationship between fresh empty objects and non-empty object types * Remvoe comment * Revert lib change * Remove trailing whitespace ffs
43 lines
1.1 KiB
TypeScript
43 lines
1.1 KiB
TypeScript
// This should behave the same as emptyObjectNotSubtypeOfIndexSignatureContainingObject2.ts
|
|
// Begin types from Lodash.
|
|
interface Dictionary<T> {
|
|
[index: string]: T;
|
|
}
|
|
|
|
interface NumericDictionary<T> {
|
|
[index: number]: T;
|
|
}
|
|
|
|
type ObjectIterator<TObject, TResult> = (
|
|
value: TObject[keyof TObject],
|
|
key: string,
|
|
collection: TObject
|
|
) => TResult;
|
|
|
|
type DictionaryIterator<T, TResult> = ObjectIterator<Dictionary<T>, TResult>;
|
|
|
|
// In lodash.d.ts this function has many overloads, but this seems to be the problematic one.
|
|
function mapValues<T, TResult>(
|
|
obj: Dictionary<T> | NumericDictionary<T> | null | undefined,
|
|
callback: DictionaryIterator<T, TResult>
|
|
): Dictionary<TResult> {
|
|
return null as any;
|
|
}
|
|
// End types from Lodash.
|
|
|
|
interface Foo {
|
|
foo: string;
|
|
}
|
|
|
|
interface Bar {
|
|
bar: string;
|
|
}
|
|
|
|
export function fooToBar(
|
|
foos: Record<string, Foo>
|
|
): Record<string, Bar | null> {
|
|
const result = foos == null ? {} : mapValues(foos, f => f.foo);
|
|
// This line _should_ fail, because `result` is not the right type.
|
|
return result;
|
|
}
|