shelving/util/file.js

Toolkit for using data in JavaScript.

import { RequiredError } from "../error/RequiredError.js";
/** Get the file extension from a file path, or return `undefined` if the input has no extension. */
export function getFileExtension(file) {
    const i = file.lastIndexOf(".");
    return (i >= 0 && file.slice(i + 1)) || undefined;
}
/** Get the file extension from a file path, or throw `RequiredError` if the input has no extension. */
export function requireFileExtension(file, caller = requireFileExtension) {
    const extension = getFileExtension(file);
    if (!extension)
        throw new RequiredError("File extension is required", { received: file, caller });
    return extension;
}