webpack/lib/util/removeBOM.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Alexander Akait @alexander-akait
*/

"use strict";

/**
 * @param {string | Buffer} strOrBuffer string or buffer
 * @returns {string | Buffer} result without BOM
 */
module.exports = strOrBuffer => {
	if (typeof strOrBuffer === "string" && strOrBuffer.charCodeAt(0) === 0xfeff) {
		return strOrBuffer.substr(1);
	} else if (
		Buffer.isBuffer(strOrBuffer) &&
		strOrBuffer[0] === 0xef &&
		strOrBuffer[1] === 0xbb &&
		strOrBuffer[2] === 0xbf
	) {
		return strOrBuffer.subarray(3);
	}

	return strOrBuffer;
};