safeParseEither.ts

import { function as fp, either as E } from 'fp-ts';

import type {
  SafeParseReturnType,
  SafeParseSuccess,
  z,
  ZodError,
  ZodType,
} from 'zod';

const isSafeParseSuccess = <I, O>(
  parseResult: SafeParseReturnType<I, O>,
): parseResult is SafeParseSuccess<O> => parseResult.success;

export const safeParseEither = <T extends ZodType>(
  type: T,
): ((x: unknown) => E.Either<ZodError<z.input<T>>, z.output<T>>) =>
  fp.flow(type.safeParse, (parseResult) =>
    isSafeParseSuccess(parseResult)
      ? E.right(parseResult.data)
      : E.left(parseResult.error),
  );

great ! thanks ! ;)