index.d.ts line 306.
These function is fs related. I believe change to FileSystem is a better name.
export interface File {
list(
path: string,
options: Partial<{ includeSubDir: boolean }>,
): { filename: string; path: string; isDir: boolean };
exists(path: string): boolean;
write(path: string, content: string): void;
read(path: string, options: Partial<{}>): string | undefined;
trash(path: string): void;
delete(path: string): void;
revealInFinder(path: string): void;
handle(path: string, mode: string): FileHandle;
}