79 lines
2.3 KiB
TypeScript
79 lines
2.3 KiB
TypeScript
type RemoveFromTuple<
|
|
Tuple extends readonly unknown[],
|
|
RemoveCount extends number,
|
|
Index extends 1[] = [],
|
|
> =
|
|
Index['length'] extends RemoveCount ? Tuple
|
|
: Tuple extends [infer First, ...infer Rest] ?
|
|
RemoveFromTuple<Rest, RemoveCount, [...Index, 1]>
|
|
: Tuple;
|
|
|
|
type ConcatTuples<
|
|
Prefix extends readonly unknown[],
|
|
Suffix extends readonly unknown[],
|
|
> = [...Prefix, ...Suffix];
|
|
|
|
type ExtractFunctionParams<T> =
|
|
T extends (
|
|
(this: infer TThis, ...args: infer P extends readonly unknown[]) => infer R
|
|
) ?
|
|
{ thisArg: TThis; params: P; returnType: R }
|
|
: never;
|
|
|
|
type BindFunction<
|
|
T extends (this: any, ...args: any[]) => any,
|
|
TThis,
|
|
TBoundArgs extends readonly unknown[],
|
|
ReceiverBound extends boolean,
|
|
> =
|
|
ExtractFunctionParams<T> extends (
|
|
{
|
|
thisArg: infer OrigThis;
|
|
params: infer P extends readonly unknown[];
|
|
returnType: infer R;
|
|
}
|
|
) ?
|
|
ReceiverBound extends true ?
|
|
(
|
|
...args: RemoveFromTuple<P, Extract<TBoundArgs['length'], number>>
|
|
) => R extends [OrigThis, ...infer Rest] ?
|
|
[TThis, ...Rest] // Replace `this` with `thisArg`
|
|
: R
|
|
: <
|
|
U,
|
|
RemainingArgs extends RemoveFromTuple<
|
|
P,
|
|
Extract<TBoundArgs['length'], number>
|
|
>,
|
|
>(
|
|
thisArg: U,
|
|
...args: RemainingArgs
|
|
) => R extends [OrigThis, ...infer Rest] ?
|
|
[U, ...ConcatTuples<TBoundArgs, Rest>] // Preserve bound args in return type
|
|
: R
|
|
: never;
|
|
|
|
declare function callBind<
|
|
const T extends (this: any, ...args: any[]) => any,
|
|
Extracted extends ExtractFunctionParams<T>,
|
|
const TBoundArgs extends Partial<Extracted['params']> & readonly unknown[],
|
|
const TThis extends Extracted['thisArg'],
|
|
>(
|
|
args: [fn: T, thisArg: TThis, ...boundArgs: TBoundArgs]
|
|
): BindFunction<T, TThis, TBoundArgs, true>;
|
|
|
|
declare function callBind<
|
|
const T extends (this: any, ...args: any[]) => any,
|
|
Extracted extends ExtractFunctionParams<T>,
|
|
const TBoundArgs extends Partial<Extracted['params']> & readonly unknown[],
|
|
>(
|
|
args: [fn: T, ...boundArgs: TBoundArgs]
|
|
): BindFunction<T, Extracted['thisArg'], TBoundArgs, false>;
|
|
|
|
declare function callBind<const TArgs extends readonly unknown[]>(
|
|
args: [fn: Exclude<TArgs[0], Function>, ...rest: TArgs]
|
|
): never;
|
|
|
|
// export as namespace callBind;
|
|
export = callBind;
|