Method create

packages/zod/src/v3/types.ts:3182–3224

* The constructor of the discriminated union schema. Its behaviour is very similar to that of the normal z.union() constructor. * However, it only allows a union of objects, all of which need to share a discriminator property. This property must * have a different value for each object in the

(
    discriminator: Discriminator,
    options: Types,
    params?: RawCreateParams
  )

   * @param params
   */
  static create<
    Discriminator extends string,
    Types extends readonly [
      ZodDiscriminatedUnionOption<Discriminator>,
      ...ZodDiscriminatedUnionOption<Discriminator>[],
    ],
  >(
    discriminator: Discriminator,
    options: Types,
    params?: RawCreateParams
  ): ZodDiscriminatedUnion<Discriminator, Types> {
    // Get all the valid discriminator values
    const optionsMap: Map<Primitive, Types[number]> = new Map();

    // try {
    for (const type of options) {
      const discriminatorValues = getDiscriminator(type.shape[discriminator]);
      if (!discriminatorValues.length) {
        throw new Error(
          `A discriminator value for key \`${discriminator}\` could not be extracted from all schema options`
        );
      }
      for (const value of discriminatorValues) {
        if (optionsMap.has(value)) {
          throw new Error(`Discriminator property ${String(discriminator)} has duplicate value ${String(value)}`);
        }

        optionsMap.set(value, type);
      }
    }

    return new ZodDiscriminatedUnion<
      Discriminator,
      // DiscriminatorValue,
      Types
    >({
      typeName: ZodFirstPartyTypeKind.ZodDiscriminatedUnion,
      discriminator,
      options,
      optionsMap,
      ...processCreateParams(params),
    });
  }
}

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