| 1 | /**
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| 2 | * The type of a function that can be converted to FP.
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| 3 | */
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| 4 | export type FPFnInput = (...args: any[]) => any;
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| 5 | /**
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| 6 | * The supported arity type.
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| 7 | */
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| 8 | export type FPArity = 1 | 2 | 3 | 4;
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| 9 | /**
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| 10 | * FP function interface. It infers the arity of the function and returns the
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| 11 | * corresponding FP function interface.
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| 12 | */
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| 13 | export type FPFn<Fn extends FPFnInput, Arity extends FPArity> = Arity extends 4
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| 14 | ? FPFn4<
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| 15 | ReturnType<Fn>,
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| 16 | Parameters<Fn>[3],
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| 17 | Parameters<Fn>[2],
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| 18 | Parameters<Fn>[1],
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| 19 | Parameters<Fn>[0]
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| 20 | >
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| 21 | : Arity extends 3
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| 22 | ? FPFn3<
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| 23 | ReturnType<Fn>,
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| 24 | Parameters<Fn>[2],
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| 25 | Parameters<Fn>[1],
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| 26 | Parameters<Fn>[0]
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| 27 | >
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| 28 | : Arity extends 2
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| 29 | ? FPFn2<ReturnType<Fn>, Parameters<Fn>[1], Parameters<Fn>[0]>
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| 30 | : Arity extends 1
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| 31 | ? FPFn1<ReturnType<Fn>, Parameters<Fn>[0]>
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| 32 | : never;
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| 33 | /**
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| 34 | * FP function interface with 1 arguments.
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| 35 | */
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| 36 | export interface FPFn1<Result, Arg> {
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| 37 | /**
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| 38 | * Curried version of the function. Returns itself.
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| 39 | */
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| 40 | (): FPFn1<Result, Arg>;
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| 41 | /**
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| 42 | * Returns the result of the function call.
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| 43 | */
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| 44 | (arg: Arg): Result;
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| 45 | }
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| 46 | /**
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| 47 | * FP function interface with 2 arguments.
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| 48 | */
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| 49 | export interface FPFn2<Result, Arg2, Arg1> {
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| 50 | /**
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| 51 | * Curried version of the function. Returns itself.
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| 52 | */
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| 53 | (): FPFn2<Result, Arg2, Arg1>;
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| 54 | /**
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| 55 | * Curried version of the function. Returns a function that accepts the rest
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| 56 | * arguments.
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| 57 | */
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| 58 | (arg2: Arg2): FPFn1<Result, Arg1>;
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| 59 | /**
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| 60 | * Returns the result of the function call.
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| 61 | */
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| 62 | (arg2: Arg2, arg1: Arg1): Result;
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| 63 | }
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| 64 | /**
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| 65 | * FP function interface with 3 arguments.
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| 66 | */
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| 67 | export interface FPFn3<Result, Arg3, Arg2, Arg1> {
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| 68 | /**
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| 69 | * Curried version of the function. Returns itself.
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| 70 | */
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| 71 | (): FPFn3<Result, Arg3, Arg2, Arg1>;
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| 72 | /**
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| 73 | * Curried version of the function. Returns a function that accepts the rest
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| 74 | * arguments.
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| 75 | */
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| 76 | (arg3: Arg3): FPFn2<Result, Arg2, Arg1>;
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| 77 | /**
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| 78 | * Curried version of the function. Returns a function that accepts the rest
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| 79 | * arguments.
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| 80 | */
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| 81 | (arg3: Arg3, arg2: Arg2): FPFn1<Result, Arg1>;
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| 82 | /**
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| 83 | * Returns the result of the function call.
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| 84 | */
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| 85 | (arg3: Arg3, arg2: Arg2, arg1: Arg1): Result;
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| 86 | }
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| 87 | /**
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| 88 | * FP function interface with 4 arguments.
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| 89 | */
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| 90 | export interface FPFn4<Result, Arg4, Arg3, Arg2, Arg1> {
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| 91 | /**
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| 92 | * Curried version of the function. Returns itself.
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| 93 | */
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| 94 | (): FPFn4<Result, Arg4, Arg3, Arg2, Arg1>;
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| 95 | /**
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| 96 | * Curried version of the function. Returns a function that accepts the rest
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| 97 | * arguments.
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| 98 | */
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| 99 | (arg4: Arg4): FPFn3<Result, Arg3, Arg2, Arg1>;
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| 100 | /**
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| 101 | * Curried version of the function. Returns a function that accepts the rest
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| 102 | * arguments.
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| 103 | */
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| 104 | (arg4: Arg4, arg3: Arg3): FPFn2<Result, Arg2, Arg1>;
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| 105 | /**
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| 106 | * Curried version of the function. Returns a function that accepts the rest
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| 107 | * arguments.
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| 108 | */
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| 109 | (arg4: Arg4, arg3: Arg3, arg2: Arg2): FPFn1<Result, Arg1>;
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| 110 | /**
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| 111 | * Returns the result of the function call.
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| 112 | */
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| 113 | (arg4: Arg4, arg3: Arg3, arg2: Arg2, arg1: Arg1): Result;
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| 114 | }
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