method SourceFile.prototype.getParentOrThrowimport { SourceFile } from "https://deno.land/x/ts_morph@21.0.1/mod.ts"; getParentOrThrow(message?: string | (() => string)): NonNullable<NodeParentType<ts.SourceFile>>Parametersoptionalmessage: string | (() => string)ReturnsNonNullable<NodeParentType<ts.SourceFile>>