diff --git a/.travis.yml b/.travis.yml
index 8a338ad..c5a2127 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,7 @@ cache:
   directories:
   - node_modules
 before_deploy:
-- ci/build.sh
+- npm run build-stage
 deploy:
   skip_cleanup: true
   provider: script
diff --git a/ci/build.sh b/ci/build.sh
deleted file mode 100755
index 947e3c3..0000000
--- a/ci/build.sh
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/bin/sh
-set -e
-CLOSURE_COMPILER_URL="https://dl.google.com/closure-compiler/compiler-latest.zip"
-PROD_GOOGLE_ANALYTICS="UA-112154345-1"
-STAGE_GOOGLE_ANALYTCIS="UA-112154345-2"
-
-install_closure() {
-    wget $CLOSURE_COMPILER_URL -O /tmp/closure.zip
-    mkdir /tmp/closure/
-    unzip /tmp/closure.zip -d /tmp/closure/
-    CLOSURE_JAR=$(ls /tmp/closure/closure-compiler-*.jar)
-    export CLOSURE_PATH=$CLOSURE_JAR
-}
-
-build_package() {
-    if [ -n "$TRAVIS_TAG" ]; then
-        export GOOGLE_ANALYTICS_TAG="$PROD_GOOGLE_ANALYTICS"
-        echo "Using prod google analytics tag"
-    else
-        export GOOGLE_ANALYTICS_TAG="$STAGE_GOOGLE_ANALYTCIS"
-        echo "Using stage google analytics tag"
-    fi
-    PRODUCTION=1 npm run webpack
-}
-
-build_info() {
-    VERSION=$(git describe --tags --always)
-    echo "version: ${VERSION}" >> dist/version-info.txt
-    echo "time: $(TZ=UTC date +'%Y-%m-%d %H:%M')" >> dist/version-info.txt
-    if [ -n "$TRAVIS" ]; then
-        echo "build id: TRAVIS ${TRAVIS_JOB_NUMBER} (${TRAVIS_BUILD_ID})" >> dist/version-info.txt
-    fi
-}
-
-
-install_closure
-build_package
-build_info
diff --git a/gulpfile.js b/gulpfile.js
index 0010cdf..faa134c 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -7,6 +7,8 @@ const istanbul = require("gulp-istanbul");
 const remapIstanbul = require("remap-istanbul/lib/gulpRemapIstanbul");
 const tsProject = ts.createProject("tsconfig.json");
 const del = require('del');
+const { getWebpackConfig } = require('./webpack.base');
+const webpack = require('webpack');
 
 function coverage_build() {
     return tsProject.src()
@@ -52,8 +54,7 @@ function lint() {
 }
 
 function clean(cb) {
-    del(['dist', 'test-dist', 'coverage-dist', 'coverage'])
-        .then(paths => cb());
+    del(['dist', 'test-dist', 'coverage-dist', 'coverage']).then(paths => cb());
 }
 
 function test_build() {
@@ -64,8 +65,28 @@ const test = gulp.series(test_build, function() {
     return gulp.src("test-dist/**/*.spec.js").pipe(jasmine());
 });
 
+function build_webpack(gtag, cb) {
+    webpack(getWebpackConfig(true, gtag), (err, stats) => {
+        cb();
+    });
+}
+
+function clean_dist(cb) {
+    del(['dist']).then(paths => cb());
+}
+
+function build_prod(cb) {
+    build_webpack("UA-112154345-1", cb);
+}
+
+function build_stage(cb) {
+    build_webpack("UA-112154345-2", cb);
+}
+
 exports.lint = lint;
 exports.clean = clean;
 exports.test = test;
 exports.coverage = coverage;
+exports.build_prod = gulp.series(clean_dist, build_prod);
+exports.build_stage = gulp.series(clean_dist, build_stage);
 exports.default = gulp.parallel(lint, gulp.series(test, coverage));
diff --git a/package-lock.json b/package-lock.json
index 13a4dc5..3068061 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -423,6 +423,23 @@
       "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
       "dev": true
     },
+    "acorn-dynamic-import": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-2.0.2.tgz",
+      "integrity": "sha1-x1K9IQvvZ5UBtsbLf8hPj0cVjMQ=",
+      "dev": true,
+      "requires": {
+        "acorn": "^4.0.3"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "4.0.13",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
+          "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
+          "dev": true
+        }
+      }
+    },
     "adm-zip": {
       "version": "0.4.13",
       "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.13.tgz",
@@ -472,7 +489,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
       "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "ansi-colors": {
       "version": "1.1.0",
@@ -521,12 +539,6 @@
       "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
       "dev": true
     },
-    "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
-    },
     "ansi-wrap": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
@@ -677,12 +689,6 @@
       "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ="
     },
-    "array-differ": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
-      "integrity": "sha1-7/UuN1gknTO+QCuLuOVkuytdQDE=",
-      "dev": true
-    },
     "array-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
@@ -1024,12 +1030,6 @@
         "tweetnacl": "^0.14.3"
       }
     },
-    "beeper": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/beeper/-/beeper-1.1.1.tgz",
-      "integrity": "sha1-5tXqjF2tABMEpwsiY4RH9pyy+Ak=",
-      "dev": true
-    },
     "better-assert": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/better-assert/-/better-assert-1.0.2.tgz",
@@ -1429,19 +1429,6 @@
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
       "dev": true
     },
-    "chalk": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^2.2.1",
-        "escape-string-regexp": "^1.0.2",
-        "has-ansi": "^2.0.0",
-        "strip-ansi": "^3.0.0",
-        "supports-color": "^2.0.0"
-      }
-    },
     "chokidar": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.0.2.tgz",
@@ -1628,12 +1615,6 @@
         }
       }
     },
-    "clone": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.4.tgz",
-      "integrity": "sha1-2jCcwmPfFZlMaIypAheco8fNfH4=",
-      "dev": true
-    },
     "clone-buffer": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/clone-buffer/-/clone-buffer-1.0.0.tgz",
@@ -1651,12 +1632,6 @@
         "shallow-clone": "^3.0.0"
       }
     },
-    "clone-stats": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/clone-stats/-/clone-stats-0.0.1.tgz",
-      "integrity": "sha1-uI+UqCzzi4eR1YBG6kAprYjKmdE=",
-      "dev": true
-    },
     "cloneable-readable": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/cloneable-readable/-/cloneable-readable-1.1.3.tgz",
@@ -1668,6 +1643,19 @@
         "readable-stream": "^2.3.5"
       }
     },
+    "closure-webpack-plugin": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/closure-webpack-plugin/-/closure-webpack-plugin-2.0.1.tgz",
+      "integrity": "sha512-ZQz24BstWdqOwyo3ttOOqS2V/CxZ9AXEO5P3W3oIO3e0ZtnL2KefFEJ+NtVwNcuvtp64ZiQf0zWs0Jur/QLtfA==",
+      "dev": true,
+      "requires": {
+        "acorn": "^5.0.0",
+        "acorn-dynamic-import": "^2.0.0",
+        "schema-utils": "1.x",
+        "unquoted-property-validator": "^1.0.2",
+        "webpack-sources": "1.x"
+      }
+    },
     "code-point-at": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
@@ -2218,12 +2206,6 @@
       "integrity": "sha1-6vQ5/U1ISK105cx9vvIAZyueNFs=",
       "dev": true
     },
-    "dateformat": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-2.2.0.tgz",
-      "integrity": "sha1-QGXiATz5+5Ft39gu+1Bq1MZ2kGI=",
-      "dev": true
-    },
     "debug": {
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -2605,41 +2587,6 @@
         "domelementtype": "1"
       }
     },
-    "duplexer2": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.0.2.tgz",
-      "integrity": "sha1-xhTc9n4vsUmVqRcR5aYX6KYKMds=",
-      "dev": true,
-      "requires": {
-        "readable-stream": "~1.1.9"
-      },
-      "dependencies": {
-        "isarray": {
-          "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
-          "dev": true
-        },
-        "readable-stream": {
-          "version": "1.1.14",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
-          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
-          "dev": true,
-          "requires": {
-            "core-util-is": "~1.0.0",
-            "inherits": "~2.0.1",
-            "isarray": "0.0.1",
-            "string_decoder": "~0.10.x"
-          }
-        },
-        "string_decoder": {
-          "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
-          "dev": true
-        }
-      }
-    },
     "duplexify": {
       "version": "3.7.1",
       "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.7.1.tgz",
@@ -3828,7 +3775,8 @@
             "ansi-regex": {
               "version": "2.1.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "aproba": {
               "version": "1.2.0",
@@ -3849,12 +3797,14 @@
             "balanced-match": {
               "version": "1.0.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "brace-expansion": {
               "version": "1.1.11",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "balanced-match": "^1.0.0",
                 "concat-map": "0.0.1"
@@ -3869,17 +3819,20 @@
             "code-point-at": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "concat-map": {
               "version": "0.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "console-control-strings": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "core-util-is": {
               "version": "1.0.2",
@@ -3996,7 +3949,8 @@
             "inherits": {
               "version": "2.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "ini": {
               "version": "1.3.5",
@@ -4008,6 +3962,7 @@
               "version": "1.0.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "number-is-nan": "^1.0.0"
               }
@@ -4022,6 +3977,7 @@
               "version": "3.0.4",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "brace-expansion": "^1.1.7"
               }
@@ -4029,12 +3985,14 @@
             "minimist": {
               "version": "0.0.8",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "minipass": {
               "version": "2.3.5",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.2",
                 "yallist": "^3.0.0"
@@ -4053,6 +4011,7 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -4133,7 +4092,8 @@
             "number-is-nan": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "object-assign": {
               "version": "4.1.1",
@@ -4145,6 +4105,7 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -4230,7 +4191,8 @@
             "safe-buffer": {
               "version": "5.1.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -4266,6 +4228,7 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
@@ -4285,6 +4248,7 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -4328,12 +4292,14 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "yallist": {
               "version": "3.0.3",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             }
           }
         },
@@ -4414,16 +4380,42 @@
       }
     },
     "google-closure-compiler": {
-      "version": "20170626.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler/-/google-closure-compiler-20170626.0.0.tgz",
-      "integrity": "sha1-DSqXXTReGqE7N+VYMlCdWbqKh+A=",
+      "version": "20190819.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler/-/google-closure-compiler-20190819.0.0.tgz",
+      "integrity": "sha512-5cwcui89TSFrKCa+oH5zq6F0esSHkGbWt1U2LgywakFhe5F27j/0F6NR7QyFYkBf3leDt5kPBvC2Dlc3ZwuFVA==",
       "dev": true,
       "requires": {
-        "chalk": "^1.0.0",
-        "vinyl": "^2.0.1",
+        "chalk": "2.x",
+        "google-closure-compiler-java": "^20190819.0.0",
+        "google-closure-compiler-js": "^20190819.0.0",
+        "google-closure-compiler-linux": "^20190819.0.0",
+        "google-closure-compiler-osx": "^20190819.0.0",
+        "google-closure-compiler-windows": "^20190819.0.0",
+        "minimist": "1.x",
+        "vinyl": "2.x",
         "vinyl-sourcemaps-apply": "^0.2.0"
       },
       "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
         "clone": {
           "version": "2.1.2",
           "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
@@ -4436,12 +4428,39 @@
           "integrity": "sha1-s3gt/4u1R04Yuba/D9/ngvh3doA=",
           "dev": true
         },
+        "google-closure-compiler-js": {
+          "version": "20190819.0.0",
+          "resolved": "https://registry.npmjs.org/google-closure-compiler-js/-/google-closure-compiler-js-20190819.0.0.tgz",
+          "integrity": "sha512-c1MrCW2sBsJ5d5judH6YnBPpxbOzts6D7XYa0KN4I97S0LjXzX5cENBlMUqMGGeSdFyjGr5FP0BxGp49k5UKxQ==",
+          "dev": true
+        },
+        "has-flag": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
+        },
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        },
         "replace-ext": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
           "integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
           "dev": true
         },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        },
         "vinyl": {
           "version": "2.2.0",
           "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.0.tgz",
@@ -4458,24 +4477,32 @@
         }
       }
     },
-    "google-closure-compiler-js": {
-      "version": "20170124.0.0",
-      "resolved": "https://registry.npmjs.org/google-closure-compiler-js/-/google-closure-compiler-js-20170124.0.0.tgz",
-      "integrity": "sha1-zXcpGhmkFY60H7JBaIpeUj4lA2Q=",
+    "google-closure-compiler-java": {
+      "version": "20190819.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler-java/-/google-closure-compiler-java-20190819.0.0.tgz",
+      "integrity": "sha512-i8KzPJZBEF0aZWSn2vlkH0JCeQGIxBVfQaUwc2fCjPbm/v5YfpZzkj38LoMDbE95BlYsq2cPveHUNC4w85UgGw==",
+      "dev": true
+    },
+    "google-closure-compiler-linux": {
+      "version": "20190819.0.0",
+      "resolved": "https://registry.npmjs.org/google-closure-compiler-linux/-/google-closure-compiler-linux-20190819.0.0.tgz",
+      "integrity": "sha512-+ia89Ot4dPyRioLlxvkfYiISwJO+2NV7SY0Zp/KfTt9x+eJaGQ9GRIQage50d1mGkUyPmFfxsdPUePpT1QlpaA==",
       "dev": true,
-      "requires": {
-        "gulp-util": "^3.0.7",
-        "minimist": "^1.2.0",
-        "webpack-core": "^0.6.8"
-      },
-      "dependencies": {
-        "minimist": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
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               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -11721,7 +11482,8 @@
             "number-is-nan": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true
+              "dev": true,
+              "optional": true
             },
             "object-assign": {
               "version": "4.1.1",
@@ -11733,6 +11495,7 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -11854,6 +11617,7 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
+              "optional": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
diff --git a/package.json b/package.json
index fbd3817..7924b25 100644
--- a/package.json
+++ b/package.json
@@ -11,9 +11,11 @@
   },
   "devDependencies": {
     "clean-webpack-plugin": "^3.0.0",
+    "closure-webpack-plugin": "^2.0.1",
     "copy-webpack-plugin": "^5.0.4",
     "coveralls": "^3.0.6",
     "del": "^5.0.0",
+    "google-closure-compiler": "^20190819.0.0",
     "gulp": "^4.0.2",
     "gulp-istanbul": "^1.1.3",
     "gulp-sourcemaps": "^2.6.4",
@@ -34,7 +36,6 @@
     "typescript": "^3.5.3",
     "webpack": "^4.39.2",
     "webpack-cli": "^3.3.6",
-    "webpack-closure-compiler": "^2.1.6",
     "webpack-dev-server": "^3.1.3"
   },
   "scripts": {
@@ -43,6 +44,8 @@
     "cover": "gulp coverage",
     "clean": "gulp clean",
     "all": "gulp default",
+    "build-prod": "gulp build_prod",
+    "build-stage": "gulp build_stage",
     "browser-test": "karma start",
     "webpack": "webpack",
     "dev-server": "webpack-dev-server"
diff --git a/src/googleAnalytics.ts b/src/googleAnalytics.ts
index b39ea4e..98347c7 100644
--- a/src/googleAnalytics.ts
+++ b/src/googleAnalytics.ts
@@ -1,5 +1,6 @@
 /* tslint:disable:no-empty */
 /* tslint:disable:only-arrow-functions */
+/** @type {function(...*):void} */
 export let gtag: (...args: any[]) => void = () => {};
 
 if (GOOGLE_ANALYTICS_TAG) {
diff --git a/src/keygen/asus.ts b/src/keygen/asus.ts
index 8b26c3c..a4a06eb 100644
--- a/src/keygen/asus.ts
+++ b/src/keygen/asus.ts
@@ -2,6 +2,7 @@
 /* tslint:disable:no-bitwise */
 import { makeSolver } from "./utils";
 
+/** @type {function(number=,number=,number=):Array<number>} */
 function initTable(a1: number = 11, a2: number = 19, a3: number = 6): number[] {
     let table: number[] = [];
     const zeroCode = "0".charCodeAt(0);
diff --git a/webpack.base.js b/webpack.base.js
new file mode 100644
index 0000000..8d70461
--- /dev/null
+++ b/webpack.base.js
@@ -0,0 +1,131 @@
+const path = require('path');
+const ClosurePlugin = require('closure-webpack-plugin');
+const { CleanWebpackPlugin } = require('clean-webpack-plugin');
+const CopyWebpackPlugin = require('copy-webpack-plugin');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const { DefinePlugin } = require('webpack');
+const { exec } = require('child_process');
+const fs = require('fs');
+
+
+function makeClosureCompiler() {
+    const externDir = path.join(__dirname, "externs");
+    const externs = [
+        path.join(externDir, "googleAnalytics.js"),
+        path.join(externDir, "performance.js"),
+        path.join(externDir, "webassembly.js")
+    ];
+
+    var flags = {
+        compilation_level: "ADVANCED",
+        externs: externs
+    };
+
+    return new ClosurePlugin({mode: 'STANDARD'}, flags);
+}
+
+
+class VersionInfoPlugin {
+    constructor(options = {}) {
+        if (options.filename == void 0) {
+            throw new Error('[VersionInfoPlugin] filename should be set');
+        }
+        this.options = options;
+    }
+
+    apply(compiler) {
+        const plugin = { name: 'VersionInfoPlugin' }
+        compiler.hooks.afterEmit.tapAsync(plugin, (compilation, callback) => {
+            exec('git describe --tags --always', (error, stdout, stderr) => {
+                if (error) {
+                    compilation.errors.push(error);
+                    callback();
+                    return;
+                }
+
+                var version_info = `version: ${stdout.trim()}\ntime: ${new Date().toISOString()}\n`;
+                if (process.env.TRAVIS) {
+                    version_info += `build id: TRAVIS ${process.env.TRAVIS_JOB_NUMBER} (${process.env.TRAVIS_BUILD_ID})\n`;
+                }
+
+                const filename = path.join(compiler.options.output.path, this.options.filename);
+
+                fs.writeFile(filename, version_info, (err) => {
+                    if (err) {
+                        compilation.errors.push(err);
+                    }
+                    callback();
+                })
+            });
+        });
+    }
+}
+
+function getWebpackConfig(production, gtag) {
+    var webpackMode;
+
+    production = (typeof(production) === 'undefined') ? false : production;
+    gtag = (typeof(gtag) === 'undefined') ? "" : gtag;
+
+    var plugins = [
+        new CleanWebpackPlugin(),
+        new CopyWebpackPlugin([
+            {
+                from: 'assets/bootstrap.min.css',
+                to: 'assets/'
+            }
+        ]),
+        new DefinePlugin({
+            GOOGLE_ANALYTICS_TAG: JSON.stringify(gtag)
+        }),
+        new HtmlWebpackPlugin({
+            minify: {
+                collapseWhitespace: true,
+                conservativeCollapse: true,
+                removeComments: true
+            },
+            inject: true,
+            template: 'html/index.html'
+        }),
+        new VersionInfoPlugin({filename: 'version-info.txt'})
+    ];
+
+    if (production) {
+        plugins.push(makeClosureCompiler());
+        webpackMode = "production";
+    } else {
+        webpackMode = "development";
+    }
+
+    return {
+        entry: "./src/ui.ts",
+        output: {
+            filename: "assets/bundle.[hash].js",
+            path: path.join(__dirname, "dist")
+        },
+        plugins: plugins,
+        optimization: {
+            concatenateModules: false
+        },
+        devtool: "source-map",
+        devServer: {
+            contentBase: path.join(__dirname, "dist"),
+            port: 9000
+        },
+        resolve: {
+            extensions: ['.ts', '.tsx', '.js']
+        },
+        mode: webpackMode,
+        module: {
+            rules: [
+                {
+                    test: /\.ts$/,
+                    exclude: /node_modules/,
+                    use: [{loader: 'ts-loader', options: {transpileOnly: true}}]
+                }
+            ]
+        }
+    }
+}
+
+exports.getWebpackConfig = getWebpackConfig
diff --git a/webpack.config.js b/webpack.config.js
index 1ddd7dc..8ae5468 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,89 +1,4 @@
-const path = require('path');
-const os = require('os');
-const ClosureCompilerPlugin = require('webpack-closure-compiler');
-const HtmlWebpackPlugin = require('html-webpack-plugin');
-const CopyWebpackPlugin = require('copy-webpack-plugin');
-const { CleanWebpackPlugin } = require('clean-webpack-plugin');
-const webpack = require('webpack');
-var webpackMode;
-
-function makeClosureCompiler() {
-    const externDir = path.join(__dirname, "externs");
-    const externs = [
-        path.join(externDir, "googleAnalytics.js"),
-        path.join(externDir, "performance.js"),
-        path.join(externDir, "webassembly.js")
-    ];
-
-    var pluginOptions = {
-        compiler: {
-            compilation_level: "ADVANCED",
-            create_source_map: true,
-            externs: externs
-        },
-        concurrency: os.cpus().length
-    };
-
-    if (process.env.CLOSURE_PATH) {
-        pluginOptions.compiler.jar = process.env.CLOSURE_PATH;
-    }
-
-    return new ClosureCompilerPlugin(pluginOptions);
-}
-
-var plugins = [
-    new CleanWebpackPlugin(),
-    new CopyWebpackPlugin([
-        {
-            from: 'assets/bootstrap.min.css',
-            to: 'assets/'
-        }
-    ]),
-    new webpack.DefinePlugin({
-        GOOGLE_ANALYTICS_TAG: JSON.stringify(process.env.GOOGLE_ANALYTICS_TAG)
-    }),
-    new HtmlWebpackPlugin({
-        minify: {
-            collapseWhitespace: true,
-            conservativeCollapse: true,
-            removeComments: true
-        },
-        inject: true,
-        template: 'html/index.html'
-    })
-];
-
-if (process.env.PRODUCTION) {
-    plugins.push(makeClosureCompiler());
-    webpackMode = "production";
-} else {
-    webpackMode = "development";
-}
+const { getWebpackConfig } = require('./webpack.base');
 
 
-module.exports = {
-    entry: "./src/ui.ts",
-    output: {
-        filename: "assets/bundle.[hash].js",
-        path: path.join(__dirname, "dist")
-    },
-    plugins: plugins,
-    devtool: "source-map",
-    devServer: {
-        contentBase: path.join(__dirname, "dist"),
-        port: 9000
-    },
-    resolve: {
-        extensions: ['.ts', '.tsx', '.js']
-    },
-    mode: webpackMode,
-    module: {
-        rules: [
-            {
-                test: /\.ts$/,
-                exclude: /node_modules/,
-                use: [{loader: 'ts-loader', options: {transpileOnly: true}}]
-            }
-        ]
-    }
-}
+module.exports = getWebpackConfig(process.env.PRODUCTION, process.env.GOOGLE_ANALYTICS_TAG);