CapacitorSet · July 31, 2017 18:01 · Jul 31, 2017
diff --git a/uglify.js b/uglify.js
@@ -0,0 +1,51 @@
+// A standalone script that replicates the preprocessing stage in box-js.
+
+const unsafe = true;
+const code = require("fs").readFileSync(process.argv[2], "utf8");
+const result = require("uglify-es").minify(code, {
+	compress: {
+		passes: 3,
+
+		booleans: true,
+		cascade: true,
+		collapse_vars: true,
+		comparisons: true,
+		conditionals: true,
+		dead_code: true,
+		drop_console: false,
+		evaluate: true,
+		if_return: true,
+		inline: true,
+		join_vars: false, // readability
+		keep_fargs: unsafe, // code may rely on Function.length
+		keep_fnames: unsafe, // code may rely on Function.prototype.name
+		keep_infinity: true, // readability
+		loops: true,
+		negate_iife: false, // readability
+		properties: true,
+		pure_getters: false, // many variables are proxies, which don't have pure getters
+		/* If unsafe preprocessing is enabled, tell uglify-es that Math.* functions
+		 * have no side effects, and therefore can be removed if the result is
+		 * unused. Related issue: mishoo/UglifyJS2#2227
+		 */
+		pure_funcs: unsafe ?
+			// https://stackoverflow.com/a/10756976
+			Object.getOwnPropertyNames(Math).map(key => `Math.${key}`) :
+			null,
+		reduce_vars: true,
+		/* Using sequences (a; b; c; -> a, b, c) provides some performance benefits
+		 * (https://github.com/CapacitorSet/box-js/commit/5031ba7114b60f1046e53b542c0e4810aad68a76#commitcomment-23243778),
+		 * but it makes code harder to read. Therefore, this behaviour is disabled.
+		 */
+		sequences: false,
+		toplevel: true,
+		typeofs: false, // typeof foo == "undefined" -> foo === void 0: the former is more readable
+		unsafe,
+		unused: true,
+	},
+	output: {
+		beautify: true,
+		comments: true,
+	},
+});
+console.log(result.code);
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