Function isShim

packages/compiler-cli/src/ngtsc/shims/src/expando.ts:110–112

(sf: ts.SourceFile)

 * Check whether `sf` is a shim `ts.SourceFile` (either a per-file shim or a top-level shim).
 */
export function isShim(sf: ts.SourceFile): boolean {
  return isExtended(sf) && (sf[NgExtension].fileShim !== null || sf[NgExtension].isTopLevelShim);
}

/**
 * Copy any shim data from one `ts.SourceFile` to another.