function generateRemoteAssetCodeFileAst()

in packages/metro/src/Bundler/util.js [88:142]

• 44 lines of code
• 4 McCabe index (conditional complexity)

function generateRemoteAssetCodeFileAst(
  assetUtilsPath: string,
  assetDescriptor: AssetDataWithoutFiles,
  remoteServer: string,
  remoteFileMap: RemoteFileMap,
): ?File {
  const t = babelTypes;

  const file = remoteFileMap[assetDescriptor.fileSystemLocation];
  const descriptor = file && file[assetDescriptor.name];
  const data = {};

  if (!descriptor) {
    return null;
  }

  for (const scale in descriptor) {
    data[+scale] = descriptor[+scale].handle;
  }

  // {2: 'path/to/image@2x', 3: 'path/to/image@3x', ...}
  const astData = babylon.parseExpression(JSON.stringify(data));

  // URI to remote server
  const URI = t.stringLiteral(remoteServer);

  // Size numbers.
  const WIDTH = t.numericLiteral(nullthrows(assetDescriptor.width));
  const HEIGHT = t.numericLiteral(nullthrows(assetDescriptor.height));

  const buildRequire = template.program(`
    const {pickScale, getUrlCacheBreaker}= require(ASSET_UTILS_PATH);
    module.exports = {
      "width": WIDTH,
      "height": HEIGHT,
      "uri": URI + OBJECT_AST[pickScale(SCALE_ARRAY)] + getUrlCacheBreaker()
    };
  `);

  return t.file(
    buildRequire({
      WIDTH,
      HEIGHT,
      URI,
      OBJECT_AST: astData,
      ASSET_UTILS_PATH: t.stringLiteral(assetUtilsPath),
      SCALE_ARRAY: t.arrayExpression(
        Object.keys(descriptor)
          .map(Number)
          .sort((a: number, b: number) => a - b)
          .map((scale: number) => t.numericLiteral(scale)),
      ),
    }),
  );
}