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chenasraf/compose.ts

Created April 1, 2023 18:57
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TS compose fn
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compose.ts
type FirstOf<T extends IOFn[]> = T extends [infer F extends (...args: any) => any, ...IOFn[]]
? Parameters<F>
: never
type LastOf<T extends IOFn[]> = T extends [...IOFn[], infer L extends (...args: any) => any]
? ReturnType<L>
: never
type IOFn<I extends any[] = any, O = any> = (...x: I) => O
type Composed<A extends IOFn[]> = (...x: FirstOf<A>) => LastOf<A>
export function compose<A extends IOFn[]>(...fns: A): Composed<A> {
return (...x: any[]) => fns.reduceRight((acc, fn) => [fn(...acc)], x)[0]
}
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