@jsonjoy.com/util/lib/types.d.ts

Various helper utilities

export type Mutable<T> = {
    -readonly [P in keyof T]: T[P];
};
export type Brand<S extends string, T, B> = S & {
    __TYPE__: T;
    __BRAND__: B;
};
export type MaybeArray<T> = T | T[];
export type Ensure<T, Ext> = T extends Ext ? T : never;
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