Function maxLength

packages/forms/signals/src/api/rules/validation/max_length.ts:39–71

(
  path: SchemaPath<TValue, SchemaPathRules.Supported, TPathKind>,
  maxLength: number | LogicFn<TValue, number | undefined, TPathKind>,
  config?: BaseValidatorConfig<TValue, TPathKind>,
)

 * @publicApi 22.0
 */
export function maxLength<
  TValue extends ValueWithLengthOrSize,
  TPathKind extends PathKind = PathKind.Root,
>(
  path: SchemaPath<TValue, SchemaPathRules.Supported, TPathKind>,
  maxLength: number | LogicFn<TValue, number | undefined, TPathKind>,
  config?: BaseValidatorConfig<TValue, TPathKind>,
) {
  const MAX_LENGTH_MEMO = metadata(path, createMetadataKey<number | undefined>(), (ctx) => {
    if (config?.when && !config.when(ctx)) {
      return undefined;
    }
    return typeof maxLength === 'number' ? maxLength : maxLength(ctx);
  });
  metadata(path, MAX_LENGTH, ({state}) => state.metadata(MAX_LENGTH_MEMO)!());
  validate(path, (ctx) => {
    if (isEmpty(ctx.value())) {
      return undefined;
    }
    const maxLength = ctx.state.metadata(MAX_LENGTH_MEMO)!();
    if (maxLength === undefined) {
      return undefined;
    }
    if (getLengthOrSize(ctx.value()) > maxLength) {
      if (config?.error) {
        return getOption(config.error, ctx);
      } else {
        return maxLengthError(maxLength, {message: getOption(config?.message, ctx)});
      }
    }
    return undefined;
  });
}