65 lines
2.2 KiB
TypeScript
65 lines
2.2 KiB
TypeScript
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type RemoveFromTuple<
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Tuple extends readonly unknown[],
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RemoveCount extends number,
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Index extends 1[] = []
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> = Index["length"] extends RemoveCount
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? Tuple
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: Tuple extends [infer First, ...infer Rest]
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? RemoveFromTuple<Rest, RemoveCount, [...Index, 1]>
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: Tuple;
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type ConcatTuples<
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Prefix extends readonly unknown[],
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Suffix extends readonly unknown[]
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> = [...Prefix, ...Suffix];
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type ExtractFunctionParams<T> = T extends (this: infer TThis, ...args: infer P extends readonly unknown[]) => infer R
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? { thisArg: TThis; params: P; returnType: R }
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: never;
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type BindFunction<
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T extends (this: any, ...args: any[]) => any,
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TThis,
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TBoundArgs extends readonly unknown[],
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ReceiverBound extends boolean
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> = ExtractFunctionParams<T> extends {
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thisArg: infer OrigThis;
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params: infer P extends readonly unknown[];
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returnType: infer R;
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}
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? ReceiverBound extends true
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? (...args: RemoveFromTuple<P, Extract<TBoundArgs["length"], number>>) => R extends [OrigThis, ...infer Rest]
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? [TThis, ...Rest] // Replace `this` with `thisArg`
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: R
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: <U, RemainingArgs extends RemoveFromTuple<P, Extract<TBoundArgs["length"], number>>>(
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thisArg: U,
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...args: RemainingArgs
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) => R extends [OrigThis, ...infer Rest]
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? [U, ...ConcatTuples<TBoundArgs, Rest>] // Preserve bound args in return type
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: R
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: never;
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declare function callBind<
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const T extends (this: any, ...args: any[]) => any,
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Extracted extends ExtractFunctionParams<T>,
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const TBoundArgs extends Partial<Extracted["params"]> & readonly unknown[],
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const TThis extends Extracted["thisArg"]
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>(
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args: [fn: T, thisArg: TThis, ...boundArgs: TBoundArgs]
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): BindFunction<T, TThis, TBoundArgs, true>;
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declare function callBind<
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const T extends (this: any, ...args: any[]) => any,
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Extracted extends ExtractFunctionParams<T>,
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const TBoundArgs extends Partial<Extracted["params"]> & readonly unknown[]
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>(
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args: [fn: T, ...boundArgs: TBoundArgs]
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): BindFunction<T, Extracted["thisArg"], TBoundArgs, false>;
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declare function callBind<const TArgs extends readonly unknown[]>(
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args: [fn: Exclude<TArgs[0], Function>, ...rest: TArgs]
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): never;
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// export as namespace callBind;
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export = callBind;
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