tf_code/js/src/id/id.ts

import { ulid } from "ulid";
import { z } from "zod";

export namespace Identifier {
  const prefixes = {
    session: "ses",
    message: "msg",
  } as const;

  export function create(
    prefix: keyof typeof prefixes,
    given?: string,
  ): string {
    if (given) {
      if (given.startsWith(prefixes[prefix])) return given;
      throw new Error(`ID ${given} does not start with ${prefixes[prefix]}`);
    }
    return [prefixes[prefix], ulid()].join("_");
  }

  export function schema(prefix: keyof typeof prefixes) {
    return z.string().startsWith(prefixes[prefix]);
  }
}