diff --git a/package.json b/package.json
index 39030c8..c96fdfe 100644
--- a/package.json
+++ b/package.json
@@ -3,11 +3,14 @@
   "version": "3.3.1-beta.1",
   "description": "Implementation of MozJPEG in pure JavaScript, using Emscripten",
   "main": "dist/mozjpeg.js",
-  "jsnext:main": "dist/mozjpeg.es2015.js",
+  "jsnext:main": "dist/mozjpeg.es6.js",
+  "module": "dist/mozjpeg.es6.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "build": "rollup -c rollup.config.js",
-    "uglify": "uglifyjs dist/mozjpeg.js -o dist/mozjpeg.min.js -m -c"
+    "build": "npm run build:cjpeg && npm run build:rollup && npm run build:uglify",
+    "build:cjpeg": "./build-js.sh",
+    "build:rollup": "rollup -c rollup.config.js",
+    "build:uglify": "uglifyjs dist/mozjpeg.js -o dist/mozjpeg.min.js -m -c"
   },
   "repository": {
     "type": "git",
@@ -35,8 +38,8 @@
     "dist"
   ],
   "devDependencies": {
-    "rollup": "^0.32.0",
-    "rollup-plugin-commonjs": "^3.0.0",
+    "rollup": "^0.57.1",
+    "rollup-plugin-commonjs": "^9.1.0",
     "uglify-js": "^3.3.18"
   }
 }
diff --git a/post.js b/post.js
index ef642df..fa2d5ac 100644
--- a/post.js
+++ b/post.js
@@ -2,7 +2,7 @@
 	try { 
 		file = FS.readFile("/output.jpg");
 	} catch (e) {
-		return new Error("No output: " + stderr);
+		throw new Error("No output: " + stderr);
 	}
 
 	FS.unlink("/output.jpg");
diff --git a/pre.js b/pre.js
index 2de71e1..e57ecb3 100644
--- a/pre.js
+++ b/pre.js
@@ -1,6 +1,6 @@
 module.exports = function(file, options) {
 	// file: Typed array containing file in PPM, PGM, BMP, or Targa format.
-	// options: hash containing options to pass to cjpeg
+	// options: hash containing options to pass to cjpeg or an array of arguments
 	// returns: object, data = typed array with file output, stderr = command output
 
 	var stdout = "";
@@ -8,14 +8,18 @@ module.exports = function(file, options) {
 
 	var args = ["-outfile", "/output.jpg"];
 
-	for (var key in options) {
-		if (!options.hasOwnProperty(key)) continue;
+	if (Array.isArray(options)) {
+		args = args.concat(options);
+	} else {
+		for (var key in options) {
+			if (!options.hasOwnProperty(key)) continue;
 
-		if (options[key]) {
-			args.push("-" + key);
-			if (typeof options[key] !== "boolean") {
-				// option has a value
-				args.push(String(options[key]));
+			if (options[key]) {
+				args.push("-" + key);
+				if (typeof options[key] !== "boolean") {
+					// option has a value
+					args.push(String(options[key]));
+				}
 			}
 		}
 	}
diff --git a/rollup.config.js b/rollup.config.js
index 0988f04..0de6ebf 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,14 +1,15 @@
-import commonjs from 'rollup-plugin-commonjs';
+import commonjs from "rollup-plugin-commonjs";
 
 export default {
-	entry: 'index.js',
+	input: "index.js",
 	plugins: [commonjs()],
-	moduleName: "mozjpeg",
-	targets: [{
-		dest: 'dist/mozjpeg.js',
-		format: 'umd'
+	output: [{
+		file: "dist/mozjpeg.js",
+		format: "umd",
+		name: "mozjpeg"
 	}, {
-		dest: 'dist/mozjpeg.es6.js',
-		format: 'es'
+		file: "dist/mozjpeg.es6.js",
+		format: "es",
+		name: "mozjpeg"
 	}]
 };
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 248c0ee..dcdceb1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,99 +2,366 @@
 # yarn lockfile v1
 
 
-acorn@^3.2.0:
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
+"@types/acorn@^4.0.3":
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/@types/acorn/-/acorn-4.0.3.tgz#d1f3e738dde52536f9aad3d3380d14e448820afd"
+  dependencies:
+    "@types/estree" "*"
 
-balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
+"@types/estree@*", "@types/estree@0.0.38":
+  version "0.0.38"
+  resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.38.tgz#c1be40aa933723c608820a99a373a16d215a1ca2"
+
+acorn-dynamic-import@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-3.0.0.tgz#901ceee4c7faaef7e07ad2a47e890675da50a278"
+  dependencies:
+    acorn "^5.0.0"
+
+acorn@^5.0.0, acorn@^5.5.3:
+  version "5.5.3"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.5.3.tgz#f473dd47e0277a08e28e9bec5aeeb04751f0b8c9"
 
-brace-expansion@^1.1.7:
-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
+arr-diff@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/arr-diff/-/arr-diff-2.0.0.tgz#8f3b827f955a8bd669697e4a4256ac3ceae356cf"
   dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
+    arr-flatten "^1.0.1"
+
+arr-flatten@^1.0.1:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/arr-flatten/-/arr-flatten-1.1.0.tgz#36048bbff4e7b47e136644316c99669ea5ae91f1"
+
+array-unique@^0.2.1:
+  version "0.2.1"
+  resolved "https://registry.yarnpkg.com/array-unique/-/array-unique-0.2.1.tgz#a1d97ccafcbc2625cc70fadceb36a50c58b01a53"
+
+braces@^1.8.2:
+  version "1.8.5"
+  resolved "https://registry.yarnpkg.com/braces/-/braces-1.8.5.tgz#ba77962e12dff969d6b76711e914b737857bf6a7"
+  dependencies:
+    expand-range "^1.8.1"
+    preserve "^0.2.0"
+    repeat-element "^1.1.2"
 
 commander@~2.15.0:
   version "2.15.1"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.15.1.tgz#df46e867d0fc2aec66a34662b406a9ccafff5b0f"
 
-concat-map@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
+date-time@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/date-time/-/date-time-2.1.0.tgz#0286d1b4c769633b3ca13e1e62558d2dbdc2eba2"
+  dependencies:
+    time-zone "^1.0.0"
 
-estree-walker@^0.2.1:
-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/estree-walker/-/estree-walker-0.2.1.tgz#bdafe8095383d8414d5dc2ecf4c9173b6db9412e"
+estree-walker@^0.3.0:
+  version "0.3.1"
+  resolved "https://registry.yarnpkg.com/estree-walker/-/estree-walker-0.3.1.tgz#e6b1a51cf7292524e7237c312e5fe6660c1ce1aa"
+
+estree-walker@^0.5.1:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/estree-walker/-/estree-walker-0.5.1.tgz#64fc375053abc6f57d73e9bd2f004644ad3c5854"
+
+expand-brackets@^0.1.4:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/expand-brackets/-/expand-brackets-0.1.5.tgz#df07284e342a807cd733ac5af72411e581d1177b"
+  dependencies:
+    is-posix-bracket "^0.1.0"
+
+expand-range@^1.8.1:
+  version "1.8.2"
+  resolved "https://registry.yarnpkg.com/expand-range/-/expand-range-1.8.2.tgz#a299effd335fe2721ebae8e257ec79644fc85337"
+  dependencies:
+    fill-range "^2.1.0"
+
+extglob@^0.3.1:
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/extglob/-/extglob-0.3.2.tgz#2e18ff3d2f49ab2765cec9023f011daa8d8349a1"
+  dependencies:
+    is-extglob "^1.0.0"
+
+filename-regex@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/filename-regex/-/filename-regex-2.0.1.tgz#c1c4b9bee3e09725ddb106b75c1e301fe2f18b26"
+
+fill-range@^2.1.0:
+  version "2.2.3"
+  resolved "https://registry.yarnpkg.com/fill-range/-/fill-range-2.2.3.tgz#50b77dfd7e469bc7492470963699fe7a8485a723"
+  dependencies:
+    is-number "^2.1.0"
+    isobject "^2.0.0"
+    randomatic "^1.1.3"
+    repeat-element "^1.1.2"
+    repeat-string "^1.5.2"
+
+for-in@^1.0.1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
+
+for-own@^0.1.4:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/for-own/-/for-own-0.1.5.tgz#5265c681a4f294dabbf17c9509b6763aa84510ce"
+  dependencies:
+    for-in "^1.0.1"
+
+glob-base@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/glob-base/-/glob-base-0.3.0.tgz#dbb164f6221b1c0b1ccf82aea328b497df0ea3c4"
+  dependencies:
+    glob-parent "^2.0.0"
+    is-glob "^2.0.0"
+
+glob-parent@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-2.0.0.tgz#81383d72db054fcccf5336daa902f182f6edbb28"
+  dependencies:
+    is-glob "^2.0.0"
+
+irregular-plurals@^1.0.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/irregular-plurals/-/irregular-plurals-1.4.0.tgz#2ca9b033651111855412f16be5d77c62a458a766"
+
+is-buffer@^1.1.5:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
+
+is-dotfile@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/is-dotfile/-/is-dotfile-1.0.3.tgz#a6a2f32ffd2dfb04f5ca25ecd0f6b83cf798a1e1"
+
+is-equal-shallow@^0.1.3:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/is-equal-shallow/-/is-equal-shallow-0.1.3.tgz#2238098fc221de0bcfa5d9eac4c45d638aa1c534"
+  dependencies:
+    is-primitive "^2.0.0"
+
+is-extendable@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/is-extendable/-/is-extendable-0.1.1.tgz#62b110e289a471418e3ec36a617d472e301dfc89"
+
+is-extglob@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-1.0.0.tgz#ac468177c4943405a092fc8f29760c6ffc6206c0"
+
+is-glob@^2.0.0, is-glob@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-2.0.1.tgz#d096f926a3ded5600f3fdfd91198cb0888c2d863"
+  dependencies:
+    is-extglob "^1.0.0"
+
+is-number@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-2.1.0.tgz#01fcbbb393463a548f2f466cce16dece49db908f"
+  dependencies:
+    kind-of "^3.0.2"
 
-magic-string@^0.15.2:
-  version "0.15.2"
-  resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.15.2.tgz#0681d7388741bbc3addaa65060992624c6c09e9c"
+is-number@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-3.0.0.tgz#24fd6201a4782cf50561c810276afc7d12d71195"
   dependencies:
-    vlq "^0.2.1"
+    kind-of "^3.0.2"
 
-minimatch@^3.0.2:
+is-posix-bracket@^0.1.0:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/is-posix-bracket/-/is-posix-bracket-0.1.1.tgz#3334dc79774368e92f016e6fbc0a88f5cd6e6bc4"
+
+is-primitive@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/is-primitive/-/is-primitive-2.0.0.tgz#207bab91638499c07b2adf240a41a87210034575"
+
+is-reference@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-reference/-/is-reference-1.1.0.tgz#50e6ef3f64c361e2c53c0416cdc9420037f2685b"
+  dependencies:
+    "@types/estree" "0.0.38"
+
+isarray@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
+
+isobject@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/isobject/-/isobject-2.1.0.tgz#f065561096a3f1da2ef46272f815c840d87e0c89"
+  dependencies:
+    isarray "1.0.0"
+
+kind-of@^3.0.2:
+  version "3.2.2"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-3.2.2.tgz#31ea21a734bab9bbb0f32466d893aea51e4a3c64"
+  dependencies:
+    is-buffer "^1.1.5"
+
+kind-of@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-4.0.0.tgz#20813df3d712928b207378691a45066fae72dd57"
+  dependencies:
+    is-buffer "^1.1.5"
+
+locate-character@^2.0.5:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/locate-character/-/locate-character-2.0.5.tgz#f2d2614d49820ecb3c92d80d193b8db755f74c0f"
+
+magic-string@^0.22.4:
+  version "0.22.5"
+  resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.22.5.tgz#8e9cf5afddf44385c1da5bc2a6a0dbd10b03657e"
+  dependencies:
+    vlq "^0.2.2"
+
+micromatch@^2.3.11:
+  version "2.3.11"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-2.3.11.tgz#86677c97d1720b363431d04d0d15293bd38c1565"
+  dependencies:
+    arr-diff "^2.0.0"
+    array-unique "^0.2.1"
+    braces "^1.8.2"
+    expand-brackets "^0.1.4"
+    extglob "^0.3.1"
+    filename-regex "^2.0.0"
+    is-extglob "^1.0.0"
+    is-glob "^2.0.1"
+    kind-of "^3.0.2"
+    normalize-path "^2.0.1"
+    object.omit "^2.0.0"
+    parse-glob "^3.0.4"
+    regex-cache "^0.4.2"
+
+normalize-path@^2.0.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-2.1.1.tgz#1ab28b556e198363a8c1a6f7e6fa20137fe6aed9"
+  dependencies:
+    remove-trailing-separator "^1.0.1"
+
+object.omit@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/object.omit/-/object.omit-2.0.1.tgz#1a9c744829f39dbb858c76ca3579ae2a54ebd1fa"
+  dependencies:
+    for-own "^0.1.4"
+    is-extendable "^0.1.1"
+
+parse-glob@^3.0.4:
   version "3.0.4"
-  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
+  resolved "https://registry.yarnpkg.com/parse-glob/-/parse-glob-3.0.4.tgz#b2c376cfb11f35513badd173ef0bb6e3a388391c"
   dependencies:
-    brace-expansion "^1.1.7"
+    glob-base "^0.3.0"
+    is-dotfile "^1.0.0"
+    is-extglob "^1.0.0"
+    is-glob "^2.0.0"
+
+parse-ms@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/parse-ms/-/parse-ms-1.0.1.tgz#56346d4749d78f23430ca0c713850aef91aa361d"
 
 path-parse@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.5.tgz#3c1adf871ea9cd6c9431b6ea2bd74a0ff055c4c1"
 
-resolve@^1.1.7:
+plur@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/plur/-/plur-2.1.2.tgz#7482452c1a0f508e3e344eaec312c91c29dc655a"
+  dependencies:
+    irregular-plurals "^1.0.0"
+
+preserve@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
+
+pretty-ms@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/pretty-ms/-/pretty-ms-3.1.0.tgz#e9cac9c76bf6ee52fe942dd9c6c4213153b12881"
+  dependencies:
+    parse-ms "^1.0.0"
+    plur "^2.1.2"
+
+randomatic@^1.1.3:
+  version "1.1.7"
+  resolved "https://registry.yarnpkg.com/randomatic/-/randomatic-1.1.7.tgz#c7abe9cc8b87c0baa876b19fde83fd464797e38c"
+  dependencies:
+    is-number "^3.0.0"
+    kind-of "^4.0.0"
+
+regex-cache@^0.4.2:
+  version "0.4.4"
+  resolved "https://registry.yarnpkg.com/regex-cache/-/regex-cache-0.4.4.tgz#75bdc58a2a1496cec48a12835bc54c8d562336dd"
+  dependencies:
+    is-equal-shallow "^0.1.3"
+
+remove-trailing-separator@^1.0.1:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
+
+repeat-element@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/repeat-element/-/repeat-element-1.1.2.tgz#ef089a178d1483baae4d93eb98b4f9e4e11d990a"
+
+repeat-string@^1.5.2:
+  version "1.6.1"
+  resolved "https://registry.yarnpkg.com/repeat-string/-/repeat-string-1.6.1.tgz#8dcae470e1c88abc2d600fff4a776286da75e637"
+
+require-relative@^0.8.7:
+  version "0.8.7"
+  resolved "https://registry.yarnpkg.com/require-relative/-/require-relative-0.8.7.tgz#7999539fc9e047a37928fa196f8e1563dabd36de"
+
+resolve@^1.5.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.6.0.tgz#0fbd21278b27b4004481c395349e7aba60a9ff5c"
   dependencies:
     path-parse "^1.0.5"
 
-rollup-plugin-commonjs@^3.0.0:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/rollup-plugin-commonjs/-/rollup-plugin-commonjs-3.3.1.tgz#da824e93615c0c56157d1f743849dc0074fabbfb"
+rollup-plugin-commonjs@^9.1.0:
+  version "9.1.0"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-commonjs/-/rollup-plugin-commonjs-9.1.0.tgz#468341aab32499123ee9a04b22f51d9bf26fdd94"
   dependencies:
-    acorn "^3.2.0"
-    estree-walker "^0.2.1"
-    magic-string "^0.15.2"
-    resolve "^1.1.7"
-    rollup-pluginutils "^1.5.1"
+    estree-walker "^0.5.1"
+    magic-string "^0.22.4"
+    resolve "^1.5.0"
+    rollup-pluginutils "^2.0.1"
 
-rollup-pluginutils@^1.5.1:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-1.5.2.tgz#1e156e778f94b7255bfa1b3d0178be8f5c552408"
+rollup-pluginutils@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-2.0.1.tgz#7ec95b3573f6543a46a6461bd9a7c544525d0fc0"
   dependencies:
-    estree-walker "^0.2.1"
-    minimatch "^3.0.2"
+    estree-walker "^0.3.0"
+    micromatch "^2.3.11"
 
-rollup@^0.32.0:
-  version "0.32.4"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.32.4.tgz#5d32efd6b9eceda26a8c3038481b389ed78a42a7"
+rollup@^0.57.1:
+  version "0.57.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.57.1.tgz#0bb28be6151d253f67cf4a00fea48fb823c74027"
   dependencies:
-    source-map-support "^0.4.0"
+    "@types/acorn" "^4.0.3"
+    acorn "^5.5.3"
+    acorn-dynamic-import "^3.0.0"
+    date-time "^2.1.0"
+    is-reference "^1.1.0"
+    locate-character "^2.0.5"
+    pretty-ms "^3.1.0"
+    require-relative "^0.8.7"
+    rollup-pluginutils "^2.0.1"
+    signal-exit "^3.0.2"
+    sourcemap-codec "^1.4.1"
 
-source-map-support@^0.4.0:
-  version "0.4.18"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.4.18.tgz#0286a6de8be42641338594e97ccea75f0a2c585f"
-  dependencies:
-    source-map "^0.5.6"
-
-source-map@^0.5.6:
-  version "0.5.7"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
+signal-exit@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
 source-map@~0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
-uglify-js@^3:
+sourcemap-codec@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/sourcemap-codec/-/sourcemap-codec-1.4.1.tgz#c8fd92d91889e902a07aee392bdd2c5863958ba2"
+
+time-zone@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/time-zone/-/time-zone-1.0.0.tgz#99c5bf55958966af6d06d83bdf3800dc82faec5d"
+
+uglify-js@^3.3.18:
   version "3.3.18"
   resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.3.18.tgz#e16df66d71638df3c9bc61cce827e46f24bdac02"
   dependencies:
     commander "~2.15.0"
     source-map "~0.6.1"
 
-vlq@^0.2.1:
+vlq@^0.2.2:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/vlq/-/vlq-0.2.3.tgz#8f3e4328cf63b1540c0d67e1b2778386f8975b26"