Function sfExtensionData

packages/compiler-cli/src/ngtsc/shims/src/expando.ts:65–81

(sf: ts.SourceFile)

 * Returns the `NgExtensionData` for a given `ts.SourceFile`, adding it if none exists.
 */
export function sfExtensionData(sf: ts.SourceFile): NgExtensionData {
  const extSf = sf as MaybeNgExtendedSourceFile;
  if (extSf[NgExtension] !== undefined) {
    // The file already has extension data, so return it directly.
    return extSf[NgExtension]!;
  }

  // The file has no existing extension data, so add it and return it.
  const extension: NgExtensionData = {
    isTopLevelShim: false,
    fileShim: null,
    originalReferencedFiles: null,
    taggedReferenceFiles: null,
  };
  extSf[NgExtension] = extension;
  return extension;
}

/**
 * Data associated with a per-shim instance `ts.SourceFile`.