Function isExtended

packages/compiler-cli/src/ngtsc/shims/src/expando.ts:58–60

(sf: ts.SourceFile)

 * Narrows a `ts.SourceFile` if it has an `NgExtension` property.
 */
export function isExtended(sf: ts.SourceFile): sf is NgExtendedSourceFile {
  return (sf as MaybeNgExtendedSourceFile)[NgExtension] !== undefined;
}

/**
 * Returns the `NgExtensionData` for a given `ts.SourceFile`, adding it if none exists.