ts-neverfalse/dist/index.d.ts

Automated error coalescing and aggregation to simplify advanced type evaluations in Typescript

import { IsError, AddError, PrintNever, PrintFalse, MergeVal } from './error.js';
import { Marked } from './interface.js';
import './utils.js';
import './config.js';

type NEVER<T, M extends string> = IsError<T> extends true ? T extends Marked ? AddError<T, [M], true> : PrintNever<T, [M]> : PrintNever<T, [M]>;
type FALSE<T, M extends string> = IsError<T> extends true ? T extends Marked ? AddError<T, [M], false> : PrintFalse<T, [M]> : PrintFalse<T, [M]>;
type VALIDATE_ALL<Validators extends any[], Err = null, T = null> = Validators extends [infer F, ...infer R] ? {
    NewErr: MergeVal<Err, F>;
    NewT: IsError<F> extends true ? null : (T extends null ? F : T);
} extends {
    NewErr: infer NewErr;
    NewT: infer NewT;
} ? VALIDATE_ALL<R, NewErr, NewT> : NEVER<F, "Could not parse error or new T"> : Err extends null ? T : Err;

export type { FALSE, NEVER, VALIDATE_ALL };