Parser.Fail

Import

import { Parser } from "@typed/router/Parser";

Access Parser.Fail through the imported Parser export. Its declaration below describes the member.

Signatures

interface Fail extends TypeFunction<string, never> {
    readonly return: never;
}

Why

Failure is the branch-selection signal used by type-level alternatives.

Ownership and lifetime

TypeScript instantiates Fail while parsing a string-literal input; partial results and unconsumed text exist only in the resulting type.

Property: return

Computes this type lambda’s parse result for its current input.

Property: return: Why

The local type-function protocol evaluates each parser combinator through this member without a parallel runtime object.

Property: return: Ownership and lifetime

TypeScript evaluates Fail.return when the surrounding parser is applied; the associated result is erased and retains no input at runtime.

Source

• packages/router/src/Parser.ts:138
• packages/router/src/Parser.ts:152