Fix #13776: Add banner before generating source map. Close gh-1246.

Gruntfile.js

@@ -41,7 +41,7 @@ module.exports = function( grunt ) {
 			srcFile: "src/sizzle/dist/sizzle.js"
 		},
 		build: {
-			all:{
+			all: {
 				dest: "dist/jquery.js",
 				src: [
 					"src/intro.js",
@@ -105,14 +105,31 @@ module.exports = function( grunt ) {
 			tasks: "dev"
 		},
 
+		"pre-uglify": {
+			all: {
+				files: {
+					"dist/jquery.pre-min.js": [ "dist/jquery.js" ]
+				},
+				options: {
+					banner: "/*! jQuery v<%= pkg.version %> | " +
+						"(c) 2005, 2013 jQuery Foundation, Inc. | " +
+						"jquery.org/license\n" +
+						"//@ sourceMappingURL=jquery.min.map\n" +
+						"*/"
+				}
+			}
+		},
 		uglify: {
 			all: {
 				files: {
-					"dist/jquery.min.js": [ "dist/jquery.js" ]
+					"dist/jquery.min.js": [ "dist/jquery.pre-min.js" ]
 				},
 				options: {
-					banner: "/*! jQuery v<%= pkg.version %> | (c) 2005, 2013 jQuery Foundation, Inc. | jquery.org/license */",
+					// Keep our hard-coded banner
+					preserveComments: "some",
 					sourceMap: "dist/jquery.min.map",
+					sourceMappingURL: "jquery.min.map",
+					report: "min",
 					beautify: {
 						ascii_only: true
 					},
@@ -225,7 +242,6 @@ module.exports = function( grunt ) {
 		grunt.log.writeln( "File '" + name + "' created." );
 	});
 
-
 	// Special "alias" task to make custom build creation less grawlix-y
 	grunt.registerTask( "custom", function() {
 		var done = this.async(),
@@ -245,7 +261,7 @@ module.exports = function( grunt ) {
 
 		grunt.util.spawn({
 			cmd: process.platform === "win32" ? "grunt.cmd" : "grunt",
-			args: [ "build:*:*:" + modules, "uglify", "dist" ]
+			args: [ "build:*:*:" + modules, "pre-uglify", "uglify", "dist" ]
 		}, function( err, result ) {
 			if ( err ) {
 				grunt.verbose.error();
@@ -260,7 +276,6 @@ module.exports = function( grunt ) {
 	});
 
 	// Special concat/build task to handle various jQuery build requirements
-	//
 	grunt.registerMultiTask(
 		"build",
 		"Concatenate source (include/exclude modules with +/- flags), embed date/version",
@@ -438,7 +453,7 @@ module.exports = function( grunt ) {
 		nonascii = false;
 
 		distpaths.forEach(function( filename ) {
-			var i, c, map,
+			var i, c,
 				text = fs.readFileSync( filename, "utf8" );
 
 			// Ensure files use only \n for line endings, not \r\n
@@ -466,19 +481,17 @@ module.exports = function( grunt ) {
 			if ( /\.map$/.test( filename ) ) {
 				text = text.replace( /"dist\//g, "\"" );
 				fs.writeFileSync( filename, text, "utf-8" );
+
+			// Use our hard-coded sourceMap directive instead of the autogenerated one (#13274; #13776)
 			} else if ( /\.min\.js$/.test( filename ) ) {
-				// Wrap sourceMap directive in multiline comments (#13274)
-				text = text.replace( /\n?(\/\/@\s*sourceMappingURL=)(.*)/,
-					function( _, directive, path ) {
-						map = "\n" + directive + path.replace( /^dist\//, "" );
-						return "";
+				i = 0;
+				text = text.replace( /(?:\/\*|)\n?\/\/@\s*sourceMappingURL=.*(\n\*\/|)/g,
+					function( match ) {
+						if ( i++ ) {
+							return "";
+						}
+						return match;
 					});
-				if ( map ) {
-					text = text.replace( /(^\/\*[\w\W]*?)\s*\*\/|$/,
-						function( _, comment ) {
-							return ( comment || "\n/*" ) + map + "\n*/";
-						});
-				}
 				fs.writeFileSync( filename, text, "utf-8" );
 			}
 
@@ -499,6 +512,24 @@ module.exports = function( grunt ) {
 		return !nonascii;
 	});
 
+	// Work around grunt-contrib-uglify sourceMap issues (jQuery #13776)
+	grunt.registerMultiTask( "pre-uglify", function() {
+		var banner = this.options().banner;
+
+		this.files.forEach(function( mapping ) {
+			// Join src
+			var input = mapping.src.map(function( file ) {
+				var contents = grunt.file.read( file );
+
+				// Strip banners
+				return contents.replace( /^\/\*!(?:.|\n)*?\*\/\n?/gm, "" );
+			}).join("\n");
+
+			// Write temp file (with optional banner)
+			grunt.file.write( mapping.dest, ( banner || "" ) + input );
+		});
+	});
+
 	// Load grunt tasks from NPM packages
 	grunt.loadNpmTasks("grunt-compare-size");
 	grunt.loadNpmTasks("grunt-git-authors");
@@ -508,7 +539,7 @@ module.exports = function( grunt ) {
 	grunt.loadNpmTasks("grunt-contrib-uglify");
 
 	// Default grunt
-	grunt.registerTask( "default", [ "update_submodules", "selector", "build:*:*", "jshint", "uglify", "dist:*", "compare_size" ] );
+	grunt.registerTask( "default", [ "update_submodules", "selector", "build:*:*", "jshint", "pre-uglify", "uglify", "dist:*", "compare_size" ] );
 
 	// Short list as a high frequency watch task
 	grunt.registerTask( "dev", [ "selector", "build:*:*", "jshint" ] );

package.json

@@ -28,7 +28,7 @@
 		"grunt-update-submodules": "0.2.0",
 		"grunt-contrib-watch": "0.3.1",
 		"grunt-contrib-jshint": "0.3.0",
-		"grunt-contrib-uglify": "0.1.2",
+		"grunt-contrib-uglify": "0.2.0",
 		"grunt": "0.4.1",
 		"gzip-js": "0.3.1",
 		"testswarm": "0.2.2"