method FileUtils.getExtensionimport { FileUtils } from "https://dotland.deno.dev/x/ts_morph@17.0.1/common/mod.ts"; getExtension(fileOrDirPath: StandardizedFilePath): stringGets the extension of the file name. Gets the extension of the file name. ParametersfileOrDirPath: StandardizedFilePath Path to get the extension from. Returnsstring