Helper functions to gradually migrate from `zod` to `@effect/schema`

parse_zod.ts

import { Data, Either } from "effect";
import type { z } from "zod";

export class ZodParseError<In> extends Data.TaggedError("ZodParseError")<{
  error: z.ZodError<In>;
}> {}

export const parseZod =
  <ReqOut, ReqIn>(schema: z.Schema<ReqOut, z.ZodTypeDef, ReqIn>) =>
  <T>(data: T): Either.Either<ZodParseError<ReqIn>, ReqOut> => {
    const parsed = schema.safeParse(data);
    return parsed.success
      ? Either.right(parsed.data)
      : Either.left(new ZodParseError({ error: parsed.error }));
  };

export const parseBrandZod =
  <A extends z.ZodTypeAny, B extends string | number | symbol>(
    schema: z.ZodBranded<A, B>
  ) =>
  <T>(
    data: T
  ): Either.Either<ZodParseError<A["_input"]>, A["_output"] & z.BRAND<B>> => {
    const parsed = schema.safeParse(data);
    return parsed.success
      ? Either.right(parsed.data)
      : Either.left(new ZodParseError({ error: parsed.error }));
  };