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TotooriaHyperion/distinct-string.ts

Created October 31, 2025 09:28
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Typescript Distinct String Type to avoid incorrect assign between different alias.
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distinct-string.ts
const InternalDistinctStringSymbol = Symbol('');
export type IDistinctString<T> = string & { [InternalDistinctStringSymbol]?: T };
export type IValue = IDistinctString<'value'>;
export type IAlias1 = IDistinctString<'alias1'>;
export type IAlias2 = IDistinctString<'alias2'>;
const a: IAlias1 = 'a'; // ok
// @ts-expect-error
const b: IAlias2 = a; // ts-error
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