Marc Mintel
5397309103
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115 lines
2.9 KiB
Plaintext
115 lines
2.9 KiB
Plaintext
/**
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* The type of a function that can be converted to FP.
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*/
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export type FPFnInput = (...args: any[]) => any;
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/**
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* The supported arity type.
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*/
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export type FPArity = 1 | 2 | 3 | 4;
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/**
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* FP function interface. It infers the arity of the function and returns the
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* corresponding FP function interface.
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*/
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export type FPFn<Fn extends FPFnInput, Arity extends FPArity> = Arity extends 4
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? FPFn4<
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ReturnType<Fn>,
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Parameters<Fn>[3],
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Parameters<Fn>[2],
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Parameters<Fn>[1],
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Parameters<Fn>[0]
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>
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: Arity extends 3
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? FPFn3<
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ReturnType<Fn>,
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Parameters<Fn>[2],
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Parameters<Fn>[1],
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Parameters<Fn>[0]
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>
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: Arity extends 2
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? FPFn2<ReturnType<Fn>, Parameters<Fn>[1], Parameters<Fn>[0]>
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: Arity extends 1
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? FPFn1<ReturnType<Fn>, Parameters<Fn>[0]>
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: never;
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/**
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* FP function interface with 1 arguments.
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*/
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export interface FPFn1<Result, Arg> {
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/**
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* Curried version of the function. Returns itself.
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*/
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(): FPFn1<Result, Arg>;
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/**
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* Returns the result of the function call.
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*/
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(arg: Arg): Result;
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}
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/**
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* FP function interface with 2 arguments.
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*/
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export interface FPFn2<Result, Arg2, Arg1> {
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/**
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* Curried version of the function. Returns itself.
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*/
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(): FPFn2<Result, Arg2, Arg1>;
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/**
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* Curried version of the function. Returns a function that accepts the rest
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* arguments.
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*/
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(arg2: Arg2): FPFn1<Result, Arg1>;
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/**
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* Returns the result of the function call.
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*/
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(arg2: Arg2, arg1: Arg1): Result;
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}
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/**
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* FP function interface with 3 arguments.
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*/
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export interface FPFn3<Result, Arg3, Arg2, Arg1> {
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/**
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* Curried version of the function. Returns itself.
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*/
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(): FPFn3<Result, Arg3, Arg2, Arg1>;
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/**
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* Curried version of the function. Returns a function that accepts the rest
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* arguments.
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*/
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(arg3: Arg3): FPFn2<Result, Arg2, Arg1>;
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/**
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* Curried version of the function. Returns a function that accepts the rest
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* arguments.
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*/
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(arg3: Arg3, arg2: Arg2): FPFn1<Result, Arg1>;
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/**
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* Returns the result of the function call.
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*/
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(arg3: Arg3, arg2: Arg2, arg1: Arg1): Result;
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}
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/**
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* FP function interface with 4 arguments.
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*/
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export interface FPFn4<Result, Arg4, Arg3, Arg2, Arg1> {
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/**
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* Curried version of the function. Returns itself.
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*/
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(): FPFn4<Result, Arg4, Arg3, Arg2, Arg1>;
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/**
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* Curried version of the function. Returns a function that accepts the rest
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* arguments.
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*/
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(arg4: Arg4): FPFn3<Result, Arg3, Arg2, Arg1>;
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/**
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* Curried version of the function. Returns a function that accepts the rest
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* arguments.
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*/
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(arg4: Arg4, arg3: Arg3): FPFn2<Result, Arg2, Arg1>;
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/**
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* Curried version of the function. Returns a function that accepts the rest
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* arguments.
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*/
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(arg4: Arg4, arg3: Arg3, arg2: Arg2): FPFn1<Result, Arg1>;
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/**
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* Returns the result of the function call.
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*/
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(arg4: Arg4, arg3: Arg3, arg2: Arg2, arg1: Arg1): Result;
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}
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