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app_vue/node_modules/webpack/lib/util/source.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("webpack-sources").Source} Source */
+
+/** @type {WeakMap<Source, WeakMap<Source, boolean>>} */
+const equalityCache = new WeakMap();
+
+/**
+ * @param {Source} a a source
+ * @param {Source} b another source
+ * @returns {boolean} true, when both sources are equal
+ */
+const _isSourceEqual = (a, b) => {
+	// prefer .buffer(), it's called anyway during emit
+	/** @type {Buffer|string} */
+	let aSource = typeof a.buffer === "function" ? a.buffer() : a.source();
+	/** @type {Buffer|string} */
+	let bSource = typeof b.buffer === "function" ? b.buffer() : b.source();
+	if (aSource === bSource) return true;
+	if (typeof aSource === "string" && typeof bSource === "string") return false;
+	if (!Buffer.isBuffer(aSource)) aSource = Buffer.from(aSource, "utf-8");
+	if (!Buffer.isBuffer(bSource)) bSource = Buffer.from(bSource, "utf-8");
+	return aSource.equals(bSource);
+};
+
+/**
+ * @param {Source} a a source
+ * @param {Source} b another source
+ * @returns {boolean} true, when both sources are equal
+ */
+const isSourceEqual = (a, b) => {
+	if (a === b) return true;
+	const cache1 = equalityCache.get(a);
+	if (cache1 !== undefined) {
+		const result = cache1.get(b);
+		if (result !== undefined) return result;
+	}
+	const result = _isSourceEqual(a, b);
+	if (cache1 !== undefined) {
+		cache1.set(b, result);
+	} else {
+		const map = new WeakMap();
+		map.set(b, result);
+		equalityCache.set(a, map);
+	}
+	const cache2 = equalityCache.get(b);
+	if (cache2 !== undefined) {
+		cache2.set(a, result);
+	} else {
+		const map = new WeakMap();
+		map.set(a, result);
+		equalityCache.set(b, map);
+	}
+	return result;
+};
+module.exports.isSourceEqual = isSourceEqual;