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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | 1x 1x 1x 9x 9x 1x 3x 1x 1x 2x 1x 9x 9x 1x 3x 1x 1x 2x 1x 2x 2x 2x 1x 1x 1x 2x 1x 7x 1x 7x 1x 1x 1x 1x | import type { ITypeBuilder } from '../typeBuilder';
import { Flattable } from './Flattable';
export type Result<T, E> = Result.Success<T> | Result.Failure<E>;
// istanbul ignore next
export namespace Result {
export type Value<R extends Result<any, any>> = R extends Result<infer T, unknown> ? T : never;
export type Error<R extends Result<any, any>> = R extends Result<unknown, infer E> ? E : never;
export class Success<T> implements Flattable<Success.Flatten<T>> {
public constructor(
public readonly value: T
) {}
public readonly error = null;
public get valueOrError(): T {
return this.value;
}
public get(): T {
return this.value;
}
public map<T2>(mapper: (value: T) => T2): Result<T2, never> {
return new Result.Success<T2>(mapper(this.value));
}
public mapError(): Result<T, never> {
return this;
}
public get flatten(): Success.Flatten<T> {
return {
state: 'success',
value: Flattable.flatten(this.value)
};
}
}
// istanbul ignore next
export namespace Success {
export type Flatten<T> = {
state: 'success';
value: Flattable.Flatten<T>;
};
export class TypeBuilder<T> implements ITypeBuilder<Flatten<T>, Success<T>> {
public constructor(
private readonly builder: ITypeBuilder<Flattable.Flatten<T>, T>
) {}
public build(value: Flatten<T>): Success<T> {
return new Success(this.builder.build(value.value));
}
}
export function builder<T>(builder: ITypeBuilder<Flattable.Flatten<T>, T>): TypeBuilder<T> {
return new TypeBuilder(builder);
}
}
export class Failure<E> implements Flattable<Failure.Flatten<E>> {
public constructor(
public readonly error: E
) {}
public readonly value = null;
public get valueOrError(): E {
return this.error;
}
public get(): never {
// eslint-disable-next-line @typescript-eslint/only-throw-error
throw this.error;
}
public map(): Result<never, E> {
return this;
}
public mapError<E2>(mapper: (value: E) => E2): Result<never, E2> {
return new Result.Failure<E2>(mapper(this.error));
}
public get flatten(): Failure.Flatten<E> {
return {
state: 'failure',
error: Flattable.flatten(this.error)
};
}
}
// istanbul ignore next
export namespace Failure {
export type Flatten<E> = {
state: 'failure';
error: Flattable.Flatten<E>;
};
export class TypeBuilder<T> implements ITypeBuilder<Flatten<T>, Failure<T>> {
public constructor(
private readonly builder: ITypeBuilder<Flattable.Flatten<T>, T>
) {}
public build(value: Flatten<T>): Failure<T> {
return new Failure(this.builder.build(value.error));
}
}
export function builder<T>(builder: ITypeBuilder<Flattable.Flatten<T>, T>): TypeBuilder<T> {
return new TypeBuilder(builder);
}
}
export type Flatten<T, E> = Success.Flatten<T> | Failure.Flatten<E>;
export class TypeBuilder<T, E> implements ITypeBuilder<Flatten<T, E>, Result<T, E>> {
public constructor(
private readonly successBuilder: ITypeBuilder<Success.Flatten<T>, Success<T>>,
private readonly failureBuilder: ITypeBuilder<Failure.Flatten<E>, Failure<E>>
) {}
public build(value: Flatten<T, E>): Result<T, E> {
if (value.state === 'success')
return this.successBuilder.build(value);
return this.failureBuilder.build(value);
}
}
export function builder<T, E>(
successBuilder: ITypeBuilder<Flattable.Flatten<T>, T>,
failureBuilder: ITypeBuilder<Flattable.Flatten<E>, E>
): TypeBuilder<T, E> {
return new TypeBuilder(Success.builder(successBuilder), Failure.builder(failureBuilder));
}
export function success<T>(value: T): Result<T, never>;
export function success(): Result<void, never>;
export function success<T>(value?: T): Result<T | void, never> {
return new Result.Success<T | void>(value);
}
export function failure<E>(error: E): Result<never, E> {
return new Result.Failure<E>(error);
}
export function isSuccess<T, E>(result: Result<T, E>): result is Result.Success<T> {
return result instanceof Result.Success;
}
export function isFailure<T, E>(result: Result<T, E>): result is Result.Failure<E> {
return result instanceof Result.Failure;
}
}
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