react-native-codegen/lib/parsers/typescript/modules/utils.js.flow

⚛️ Code generation tools for React Native

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict
 * @format
 */

'use strict';

import type {
  NativeModuleTypeAnnotation,
  Nullable,
} from '../../../CodegenSchema.js';

function unwrapNullable<+T: NativeModuleTypeAnnotation>(
  x: Nullable<T>,
): [T, boolean] {
  if (x.type === 'NullableTypeAnnotation') {
    return [x.typeAnnotation, true];
  }

  return [x, false];
}

function wrapNullable<+T: NativeModuleTypeAnnotation>(
  nullable: boolean,
  typeAnnotation: T,
): Nullable<T> {
  if (!nullable) {
    return typeAnnotation;
  }

  return {
    type: 'NullableTypeAnnotation',
    typeAnnotation,
  };
}

module.exports = {
  unwrapNullable,
  wrapNullable,
};