diff --git a/.babelrc.js b/.babelrc.js
index bece57ec4a5..0cad24f08d5 100644
--- a/.babelrc.js
+++ b/.babelrc.js
@@ -23,7 +23,8 @@ module.exports = {
             "ie >= 10",
             "ios >= 8"
           ]
-        }
+        },
+        modules: 'commonjs' //This causes Babel to transpile ES modules into CJS modules before Webpack sees them, which prevents Webpack from creating getters, which fixes Sinon.(Ref: https://github.com/webpack/webpack/issues/6979)
       }
     ]
   ],
diff --git a/gulpHelpers.js b/gulpHelpers.js
index 84f01b4e966..7bb9f42d65d 100644
--- a/gulpHelpers.js
+++ b/gulpHelpers.js
@@ -127,7 +127,7 @@ module.exports = {
   nameModules: function(externalModules) {
     var modules = this.getModules(externalModules);
     return through.obj(function(file, enc, done) {
-      file.named = modules[file.path] ? modules[file.path] : 'prebid';
+      file.named = modules[file.path] ? modules[file.path] : 'prebid-core';
       this.push(file);
       done();
     })
diff --git a/gulpfile.js b/gulpfile.js
index 24c628ef228..74f711929ef 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -22,6 +22,7 @@ var shell = require('gulp-shell');
 var eslint = require('gulp-eslint');
 var gulpif = require('gulp-if');
 var sourcemaps = require('gulp-sourcemaps');
+var filter = require('gulp-filter');
 var through = require('through2');
 var fs = require('fs');
 var jsEscape = require('gulp-js-escape');
@@ -66,13 +67,13 @@ function lint(done) {
   }
   const isFixed = function(file) {
     return file.eslint != null && file.eslint.fixed;
-  }
+  };
   return gulp.src(['src/**/*.js', 'modules/**/*.js', 'test/**/*.js'], {base: './'})
     .pipe(gulpif(argv.nolintfix, eslint(), eslint({fix: true})))
     .pipe(eslint.format('stylish'))
     .pipe(eslint.failAfterError())
     .pipe(gulpif(isFixed, gulp.dest('./')));
-};
+}
 
 // View the code coverage report in the browser.
 function viewCoverage(done) {
@@ -86,7 +87,7 @@ function viewCoverage(done) {
   });
   opens('http://' + mylocalhost + ':' + coveragePort);
   done();
-};
+}
 
 viewCoverage.displayName = 'view-coverage';
 
@@ -115,36 +116,32 @@ function watch(done) {
   done();
 };
 
-function makeDevpackPkg() {
+function makeWebpackPkg(dev) {
   var cloned = _.cloneDeep(webpackConfig);
-  cloned.devtool = 'source-map';
   var externalModules = helpers.getArgModules();
 
-  const analyticsSources = helpers.getAnalyticsSources();
-  const moduleSources = helpers.getModulePaths(externalModules);
-
-  return gulp.src([].concat(moduleSources, analyticsSources, 'src/prebid.js'))
-    .pipe(helpers.nameModules(externalModules))
-    .pipe(webpackStream(cloned, webpack))
-    .pipe(gulp.dest('build/dev'))
-    .pipe(connect.reload());
-}
-
-function makeWebpackPkg() {
-  var cloned = _.cloneDeep(webpackConfig);
-  delete cloned.devtool;
-
-  var externalModules = helpers.getArgModules();
+  if (!dev) {
+    delete cloned.devtool;
+    cloned.mode = 'production';
+  }
 
   const analyticsSources = helpers.getAnalyticsSources();
   const moduleSources = helpers.getModulePaths(externalModules);
 
+  var coreFilter = filter(['**/prebid-core.js', '**/prebid-shared.js'], {restore: true});
+
   return gulp.src([].concat(moduleSources, analyticsSources, 'src/prebid.js'))
     .pipe(helpers.nameModules(externalModules))
     .pipe(webpackStream(cloned, webpack))
-    .pipe(uglify())
-    .pipe(gulpif(file => file.basename === 'prebid-core.js', header(banner, { prebid: prebid })))
-    .pipe(gulp.dest('build/dist'));
+    .pipe(coreFilter)
+    .pipe(sourcemaps.init({loadMaps: true}))
+    .pipe(concat('prebid-core.js'))
+    .pipe(sourcemaps.write())
+    .pipe(coreFilter.restore)
+    .pipe(gulpif(!dev, uglify()))
+    .pipe(gulpif(file => (!dev && file.basename === 'prebid-core.js'), header(banner, { prebid: prebid })))
+    .pipe(gulp.dest(dev ? 'build/dev' : 'build/dist'))
+    .pipe(connect.reload());
 }
 
 function gulpBundle(dev) {
@@ -202,7 +199,7 @@ function bundle(dev, moduleArr) {
       global: prebid.globalVarName
     }
     )))
-    .pipe(gulpif(dev, sourcemaps.write('.')));
+    .pipe(gulpif(dev, sourcemaps.write()));
 }
 
 // Run the unit tests.
@@ -298,8 +295,8 @@ gulp.task(clean);
 
 gulp.task(escapePostbidConfig);
 
-gulp.task('build-bundle-dev', gulp.series(makeDevpackPkg, gulpBundle.bind(null, true)));
-gulp.task('build-bundle-prod', gulp.series(makeWebpackPkg, gulpBundle.bind(null, false)));
+gulp.task('build-bundle-dev', gulp.series(makeWebpackPkg.bind(null, true), gulpBundle.bind(null, true)));
+gulp.task('build-bundle-prod', gulp.series(makeWebpackPkg.bind(null, false), gulpBundle.bind(null, false)));
 
 // public tasks (dependencies are needed for each task since they can be ran on their own)
 gulp.task('test', gulp.series(clean, lint, test));
@@ -313,7 +310,7 @@ gulp.task('build', gulp.series(clean, 'build-bundle-prod'));
 gulp.task('build-postbid', gulp.series(escapePostbidConfig, buildPostbid));
 
 gulp.task('serve', gulp.series(clean, lint, gulp.parallel('build-bundle-dev', watch, test)));
-gulp.task('default', gulp.series(clean, makeWebpackPkg));
+gulp.task('default', gulp.series(clean, makeWebpackPkg.bind(null, true)));
 
 gulp.task('e2e-test', gulp.series(clean, setupE2e, gulp.parallel('build-bundle-dev', watch), test))
 // other tasks
diff --git a/karma.conf.maker.js b/karma.conf.maker.js
index 9aa416375b5..07fed06b90a 100644
--- a/karma.conf.maker.js
+++ b/karma.conf.maker.js
@@ -11,9 +11,9 @@ function newWebpackConfig(codeCoverage) {
   // Make a clone here because we plan on mutating this object, and don't want parallel tasks to trample each other.
   var webpackConfig = _.cloneDeep(webpackConf);
 
-  // remove optimize plugin for tests
+  // remove plugin for tests
   webpackConfig.plugins.pop()
-
+  webpackConfig.optimization = {};
   webpackConfig.devtool = 'inline-source-map';
 
   if (codeCoverage) {
diff --git a/package-lock.json b/package-lock.json
index bb8263638fb..ce80471df7f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -872,6 +872,200 @@
       "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
       "dev": true
     },
+    "@types/minimatch": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
+      "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA==",
+      "dev": true
+    },
+    "@webassemblyjs/ast": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.8.5.tgz",
+      "integrity": "sha512-aJMfngIZ65+t71C3y2nBBg5FFG0Okt9m0XEgWZ7Ywgn1oMAT8cNwx00Uv1cQyHtidq0Xn94R4TAywO+LCQ+ZAQ==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/helper-module-context": "1.8.5",
+        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
+        "@webassemblyjs/wast-parser": "1.8.5"
+      }
+    },
+    "@webassemblyjs/floating-point-hex-parser": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.8.5.tgz",
+      "integrity": "sha512-9p+79WHru1oqBh9ewP9zW95E3XAo+90oth7S5Re3eQnECGq59ly1Ri5tsIipKGpiStHsUYmY3zMLqtk3gTcOtQ==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-api-error": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-api-error/-/helper-api-error-1.8.5.tgz",
+      "integrity": "sha512-Za/tnzsvnqdaSPOUXHyKJ2XI7PDX64kWtURyGiJJZKVEdFOsdKUCPTNEVFZq3zJ2R0G5wc2PZ5gvdTRFgm81zA==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-buffer": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-buffer/-/helper-buffer-1.8.5.tgz",
+      "integrity": "sha512-Ri2R8nOS0U6G49Q86goFIPNgjyl6+oE1abW1pS84BuhP1Qcr5JqMwRFT3Ah3ADDDYGEgGs1iyb1DGX+kAi/c/Q==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-code-frame": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-code-frame/-/helper-code-frame-1.8.5.tgz",
+      "integrity": "sha512-VQAadSubZIhNpH46IR3yWO4kZZjMxN1opDrzePLdVKAZ+DFjkGD/rf4v1jap744uPVU6yjL/smZbRIIJTOUnKQ==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/wast-printer": "1.8.5"
+      }
+    },
+    "@webassemblyjs/helper-fsm": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-fsm/-/helper-fsm-1.8.5.tgz",
+      "integrity": "sha512-kRuX/saORcg8se/ft6Q2UbRpZwP4y7YrWsLXPbbmtepKr22i8Z4O3V5QE9DbZK908dh5Xya4Un57SDIKwB9eow==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-module-context": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-module-context/-/helper-module-context-1.8.5.tgz",
+      "integrity": "sha512-/O1B236mN7UNEU4t9X7Pj38i4VoU8CcMHyy3l2cV/kIF4U5KoHXDVqcDuOs1ltkac90IM4vZdHc52t1x8Yfs3g==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "mamacro": "^0.0.3"
+      }
+    },
+    "@webassemblyjs/helper-wasm-bytecode": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-wasm-bytecode/-/helper-wasm-bytecode-1.8.5.tgz",
+      "integrity": "sha512-Cu4YMYG3Ddl72CbmpjU/wbP6SACcOPVbHN1dI4VJNJVgFwaKf1ppeFJrwydOG3NDHxVGuCfPlLZNyEdIYlQ6QQ==",
+      "dev": true
+    },
+    "@webassemblyjs/helper-wasm-section": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/helper-wasm-section/-/helper-wasm-section-1.8.5.tgz",
+      "integrity": "sha512-VV083zwR+VTrIWWtgIUpqfvVdK4ff38loRmrdDBgBT8ADXYsEZ5mPQ4Nde90N3UYatHdYoDIFb7oHzMncI02tA==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/helper-buffer": "1.8.5",
+        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
+        "@webassemblyjs/wasm-gen": "1.8.5"
+      }
+    },
+    "@webassemblyjs/ieee754": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/ieee754/-/ieee754-1.8.5.tgz",
+      "integrity": "sha512-aaCvQYrvKbY/n6wKHb/ylAJr27GglahUO89CcGXMItrOBqRarUMxWLJgxm9PJNuKULwN5n1csT9bYoMeZOGF3g==",
+      "dev": true,
+      "requires": {
+        "@xtuc/ieee754": "^1.2.0"
+      }
+    },
+    "@webassemblyjs/leb128": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/leb128/-/leb128-1.8.5.tgz",
+      "integrity": "sha512-plYUuUwleLIziknvlP8VpTgO4kqNaH57Y3JnNa6DLpu/sGcP6hbVdfdX5aHAV716pQBKrfuU26BJK29qY37J7A==",
+      "dev": true,
+      "requires": {
+        "@xtuc/long": "4.2.2"
+      }
+    },
+    "@webassemblyjs/utf8": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/utf8/-/utf8-1.8.5.tgz",
+      "integrity": "sha512-U7zgftmQriw37tfD934UNInokz6yTmn29inT2cAetAsaU9YeVCveWEwhKL1Mg4yS7q//NGdzy79nlXh3bT8Kjw==",
+      "dev": true
+    },
+    "@webassemblyjs/wasm-edit": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/wasm-edit/-/wasm-edit-1.8.5.tgz",
+      "integrity": "sha512-A41EMy8MWw5yvqj7MQzkDjU29K7UJq1VrX2vWLzfpRHt3ISftOXqrtojn7nlPsZ9Ijhp5NwuODuycSvfAO/26Q==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/helper-buffer": "1.8.5",
+        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
+        "@webassemblyjs/helper-wasm-section": "1.8.5",
+        "@webassemblyjs/wasm-gen": "1.8.5",
+        "@webassemblyjs/wasm-opt": "1.8.5",
+        "@webassemblyjs/wasm-parser": "1.8.5",
+        "@webassemblyjs/wast-printer": "1.8.5"
+      }
+    },
+    "@webassemblyjs/wasm-gen": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/wasm-gen/-/wasm-gen-1.8.5.tgz",
+      "integrity": "sha512-BCZBT0LURC0CXDzj5FXSc2FPTsxwp3nWcqXQdOZE4U7h7i8FqtFK5Egia6f9raQLpEKT1VL7zr4r3+QX6zArWg==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
+        "@webassemblyjs/ieee754": "1.8.5",
+        "@webassemblyjs/leb128": "1.8.5",
+        "@webassemblyjs/utf8": "1.8.5"
+      }
+    },
+    "@webassemblyjs/wasm-opt": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/wasm-opt/-/wasm-opt-1.8.5.tgz",
+      "integrity": "sha512-HKo2mO/Uh9A6ojzu7cjslGaHaUU14LdLbGEKqTR7PBKwT6LdPtLLh9fPY33rmr5wcOMrsWDbbdCHq4hQUdd37Q==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/helper-buffer": "1.8.5",
+        "@webassemblyjs/wasm-gen": "1.8.5",
+        "@webassemblyjs/wasm-parser": "1.8.5"
+      }
+    },
+    "@webassemblyjs/wasm-parser": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/wasm-parser/-/wasm-parser-1.8.5.tgz",
+      "integrity": "sha512-pi0SYE9T6tfcMkthwcgCpL0cM9nRYr6/6fjgDtL6q/ZqKHdMWvxitRi5JcZ7RI4SNJJYnYNaWy5UUrHQy998lw==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/helper-api-error": "1.8.5",
+        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
+        "@webassemblyjs/ieee754": "1.8.5",
+        "@webassemblyjs/leb128": "1.8.5",
+        "@webassemblyjs/utf8": "1.8.5"
+      }
+    },
+    "@webassemblyjs/wast-parser": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/wast-parser/-/wast-parser-1.8.5.tgz",
+      "integrity": "sha512-daXC1FyKWHF1i11obK086QRlsMsY4+tIOKgBqI1lxAnkp9xe9YMcgOxm9kLe+ttjs5aWV2KKE1TWJCN57/Btsg==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/floating-point-hex-parser": "1.8.5",
+        "@webassemblyjs/helper-api-error": "1.8.5",
+        "@webassemblyjs/helper-code-frame": "1.8.5",
+        "@webassemblyjs/helper-fsm": "1.8.5",
+        "@xtuc/long": "4.2.2"
+      }
+    },
+    "@webassemblyjs/wast-printer": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/@webassemblyjs/wast-printer/-/wast-printer-1.8.5.tgz",
+      "integrity": "sha512-w0U0pD4EhlnvRyeJzBqaVSJAo9w/ce7/WPogeXLzGkO6hzhr4GnQIZ4W4uUt5b9ooAaXPtnXlj0gzsXEOUNYMg==",
+      "dev": true,
+      "requires": {
+        "@webassemblyjs/ast": "1.8.5",
+        "@webassemblyjs/wast-parser": "1.8.5",
+        "@xtuc/long": "4.2.2"
+      }
+    },
+    "@xtuc/ieee754": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@xtuc/ieee754/-/ieee754-1.2.0.tgz",
+      "integrity": "sha512-DX8nKgqcGwsc0eJSqYt5lwP4DH5FlHnmuWWBRy7X0NcaGR0ZtuyeESgMwTYVEtxmsNGY+qit4QYT/MIYTOTPeA==",
+      "dev": true
+    },
+    "@xtuc/long": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/@xtuc/long/-/long-4.2.2.tgz",
+      "integrity": "sha512-NuHqBY1PB/D8xU6s/thBgOAiAP7HOYDQ32+BFZILJ8ivkUkAHQnWfn6WhL79Owj1qmUnoN/YPhktdIoucipkAQ==",
+      "dev": true
+    },
     "JSONStream": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.5.tgz",
@@ -904,23 +1098,6 @@
       "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
-        }
-      }
-    },
     "acorn-jsx": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
@@ -971,6 +1148,12 @@
         "json-schema-traverse": "^0.3.0"
       }
     },
+    "ajv-errors": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/ajv-errors/-/ajv-errors-1.0.1.tgz",
+      "integrity": "sha512-DCRfO/4nQ+89p/RK43i8Ezd41EqdGIU4ld7nGF8OQ14oc/we5rEntLCUa7+jrn3nn83BosfwZA0wb4pon2o8iQ==",
+      "dev": true
+    },
     "ajv-keywords": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
@@ -1092,6 +1275,12 @@
         "default-require-extensions": "^1.0.0"
       }
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
+      "dev": true
+    },
     "archiver": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/archiver/-/archiver-2.1.1.tgz",
@@ -1295,6 +1484,12 @@
         }
       }
     },
+    "array-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
+      "dev": true
+    },
     "array-uniq": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
@@ -1313,6 +1508,12 @@
       "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog==",
       "dev": true
     },
+    "arrify": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-2.0.1.tgz",
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@@ -15473,18 +15747,16 @@
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+        "memory-fs": "^0.4.1",
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@@ -15496,15 +15768,13 @@
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@@ -16139,6 +16409,15 @@
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diff --git a/package.json b/package.json
index 13744d61755..362b0755c0a 100755
--- a/package.json
+++ b/package.json
@@ -47,6 +47,7 @@
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@@ -75,13 +76,13 @@
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@@ -89,7 +90,7 @@
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     "wdio-spec-reporter": "^0.1.5",
     "webdriverio": "^4.13.2",
-    "webpack": "^3.0.0",
+    "webpack": "^4.39.2",
     "webpack-bundle-analyzer": "^3.3.2",
     "webpack-stream": "^3.2.0",
     "yargs": "^1.3.1"
diff --git a/plugins/RequireEnsureWithoutJsonp.js b/plugins/RequireEnsureWithoutJsonp.js
deleted file mode 100644
index c15af360e56..00000000000
--- a/plugins/RequireEnsureWithoutJsonp.js
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * RequireEnsureWithoutJsonp
- *
- * This plugin redefines the behavior of require.ensure that is used by webpack to load chunks. Usually require.ensure
- * includes code that allows the asynchronous loading of webpack chunks through jsonp requests AND includes a manifest
- * of all the build chunks so that they can be requested by name (e.g. require.ensure('./module.js'). Since that
- * functionality is not required and we plan on loading all of our chunks manually (either by concatenating all the
- * files together or including as individual scripts) we don't want the overhead of including that loading code or the
- * file manifest.  In this plugin, that code is replaced with an error message if a module is requested that hasn't been
- * loaded manually.
- *
- * @constructor
- */
-function RequireEnsureWithoutJsonp() {}
-RequireEnsureWithoutJsonp.prototype.apply = function(compiler) {
-  compiler.plugin('compilation', function(compilation) {
-    compilation.mainTemplate.plugin('require-ensure', function(_, chunk, hash) {
-      return '';
-    });
-  });
-};
-
-module.exports = RequireEnsureWithoutJsonp;
diff --git a/webpack.conf.js b/webpack.conf.js
index a5c75fa8a1a..65a396a0e49 100644
--- a/webpack.conf.js
+++ b/webpack.conf.js
@@ -1,8 +1,6 @@
 var prebid = require('./package.json');
 var path = require('path');
-var webpack = require('webpack');
 var helpers = require('./gulpHelpers');
-var RequireEnsureWithoutJsonp = require('./plugins/RequireEnsureWithoutJsonp.js');
 var { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
 var argv = require('yargs').argv;
 var allowedModules = require('./allowedModules');
@@ -12,9 +10,7 @@ var neverBundle = [
   'AnalyticsAdapter.js'
 ];
 
-var plugins = [
-  new RequireEnsureWithoutJsonp()
-];
+var plugins = [];
 
 if (argv.analyze) {
   plugins.push(
@@ -22,26 +18,9 @@ if (argv.analyze) {
   )
 }
 
-plugins.push(  // this plugin must be last so it can be easily removed for karma unit tests
-  new webpack.optimize.CommonsChunkPlugin({
-    name: 'prebid',
-    filename: 'prebid-core.js',
-    minChunks: function(module) {
-       return (
-        (
-          module.context && module.context.startsWith(path.resolve('./src')) &&
-          !(module.resource && neverBundle.some(name => module.resource.includes(name)))
-        ) ||
-        module.resource && (allowedModules.src.concat(['core-js'])).some(
-          name => module.resource.includes(path.resolve('./node_modules/' + name))
-        )
-      );
-    }
-  })
-);
-
 module.exports = {
-  devtool: 'source-map',
+  devtool: 'inline-source-map',
+  mode: 'development',
   resolve: {
     modules: [
       path.resolve('.'),
@@ -74,5 +53,39 @@ module.exports = {
       }
     ]
   },
+  optimization: {
+    // we generate a runtime entry chunk, prebid-core, and separate prebid-shared cacheGroup chunk and then
+    // concatenate them together in gulp (as prebid-core) to get around splitChunks bug with having entry chunks
+    // share a name with cacheGroups: https://github.com/webpack/webpack/issues/7230
+    runtimeChunk: {
+      name: 'prebid-core'
+    },
+    minimize: false,
+    splitChunks: {
+      chunks: 'all',
+      cacheGroups: {
+        vendors: false,
+        prebidShared: {
+          chunks: 'all',
+          name: 'prebid-shared',
+          filename: 'prebid-shared.js',
+          enforce: true,
+          reuseExistingChunk: true,
+          test: function(module, chunks) {
+            return (
+              (
+                module.context && module.context.startsWith(path.resolve('./src')) &&
+                !(module.resource && neverBundle.some(name => module.resource.includes(name)))
+              ) || (
+                module.resource && (allowedModules.src.concat(['core-js'])).some(
+                  name => module.resource.includes(path.resolve('./node_modules/' + name))
+                )
+              )
+            )
+          }
+        }
+      }
+    }
+  },
   plugins
 };