diff --git a/.travis.yml b/.travis.yml
index 16f2dab..77736c3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,16 +8,13 @@ jobs:
   fast_finish: true
   allow_failures:
     - env: WEBPACK_VERSION=canary
+    - node_js: 9
   include:
     - &test-latest
       stage: Webpack latest
       node_js: 6
       env: WEBPACK_VERSION=latest JOB_PART=test
       script: npm run travis:$JOB_PART
-    - <<: *test-latest
-      node_js: 4.8
-      env: WEBPACK_VERSION=latest JOB_PART=test
-      script: npm run travis:$JOB_PART
     - <<: *test-latest
       node_js: 8
       env: WEBPACK_VERSION=latest JOB_PART=lint
@@ -28,10 +25,13 @@ jobs:
       script: npm run travis:$JOB_PART
       after_success: 'bash <(curl -s https://codecov.io/bash)'
     - stage: Webpack canary
-      before_script: npm i --no-save git://github.com/webpack/webpack.git#master
-      script: npm run travis:$JOB_PART
       node_js: 8
-      env: WEBPACK_VERSION=canary JOB_PART=test
+      env: WEBPACK_VERSION=4.0.0-alpha.0 JOB_PART=test
+      script: npm run travis:$JOB_PART
+    - stage: NodeJS Next
+      node_js: 9
+      env: WEBPACK_VERSION=latest JOB_PART=test
+      script: npm run travis:$JOB_PART
 before_install:
   - 'if [[ `npm -v` != 5* ]]; then npm i -g npm@^5.0.0; fi'
   - nvm --version
diff --git a/appveyor.yml b/appveyor.yml
index 55caea9..f3dd0f9 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -11,19 +11,16 @@ environment:
     - nodejs_version: '6'
       webpack_version: latest
       job_part: test
-    - nodejs_version: '4.8'
-      webpack_version: latest
-      job_part: test
 build: 'off'
 matrix:
   fast_finish: true
 install:
   - ps: Install-Product node $env:nodejs_version x64
-  - npm i -g npm@^5.0.0
+  - npm i -g npm@latest
   - npm install
 before_test:
   - cmd: npm install webpack@%webpack_version%
 test_script:
   - node --version
   - npm --version
-  - cmd: npm run appveyor:%job_part%
+  - cmd: npm run ci:%job_part%
diff --git a/package-lock.json b/package-lock.json
index f3288ac..f52843e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -186,6 +186,12 @@
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
+    "arr-union": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+      "dev": true
+    },
     "array-equal": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
@@ -238,9 +244,9 @@
       "dev": true
     },
     "asn1.js": {
-      "version": "4.9.2",
-      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.9.2.tgz",
-      "integrity": "sha512-b/OsSjvWEo8Pi8H0zsDd2P6Uqo2TK2pH8gNLSJtNLM2Db0v2QaAZ0pBQJXVjAn4gBuugeVDr7s63ZogpUIwWDg==",
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
+      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
       "dev": true,
       "requires": {
         "bn.js": "4.11.8",
@@ -263,6 +269,12 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
       "dev": true
     },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
+      "dev": true
+    },
     "async": {
       "version": "2.6.0",
       "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
@@ -284,6 +296,12 @@
       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
       "dev": true
     },
+    "atob": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.0.3.tgz",
+      "integrity": "sha1-GcenYEc3dEaPILLS0DNyrX1Mv10=",
+      "dev": true
+    },
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
@@ -1208,10 +1226,42 @@
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
     },
+    "base": {
+      "version": "0.11.2",
+      "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
+      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
+      "dev": true,
+      "requires": {
+        "cache-base": "1.0.1",
+        "class-utils": "0.3.6",
+        "component-emitter": "1.2.1",
+        "define-property": "1.0.0",
+        "isobject": "3.0.1",
+        "mixin-deep": "1.3.1",
+        "pascalcase": "0.1.1"
+      },
+      "dependencies": {
+        "define-property": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
+          "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
+          "dev": true,
+          "requires": {
+            "is-descriptor": "1.0.2"
+          }
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        }
+      }
+    },
     "base64-js": {
-      "version": "1.2.1",
-      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.2.1.tgz",
-      "integrity": "sha512-dwVUVIXsBZXwTuwnXI9RK8sBmgq09NDHzyR9SAph9eqk76gKK2JSQmZARC2zRC81JC2QTtxD0ARU5qTS25gIGw==",
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.2.3.tgz",
+      "integrity": "sha512-MsAhsUW1GxCdgYSO6tAfZrNapmUKk7mWx/k5mFY/A1gBtkaCaNapTg+FExCw1r9yeaZhqx/xPg43xgTFH6KL5w==",
       "dev": true
     },
     "bcrypt-pbkdf": {
@@ -1441,7 +1491,7 @@
       "integrity": "sha1-bRu2AbB6TvztlwlBMgkwJ8lbwpg=",
       "dev": true,
       "requires": {
-        "base64-js": "1.2.1",
+        "base64-js": "1.2.3",
         "ieee754": "1.1.8",
         "isarray": "1.0.0"
       }
@@ -1475,7 +1525,7 @@
         "indent-string": "3.2.0",
         "minimist": "1.2.0",
         "read-pkg-up": "1.0.1",
-        "suffix": "0.1.0",
+        "suffix": "0.1.1",
         "text-table": "0.2.0"
       },
       "dependencies": {
@@ -1509,6 +1559,31 @@
         }
       }
     },
+    "cache-base": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
+      "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
+      "dev": true,
+      "requires": {
+        "collection-visit": "1.0.0",
+        "component-emitter": "1.2.1",
+        "get-value": "2.0.6",
+        "has-value": "1.0.0",
+        "isobject": "3.0.1",
+        "set-value": "2.0.0",
+        "to-object-path": "0.3.0",
+        "union-value": "1.0.0",
+        "unset-value": "1.0.0"
+      },
+      "dependencies": {
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        }
+      }
+    },
     "caller-path": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
@@ -1591,6 +1666,7 @@
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.7.0.tgz",
       "integrity": "sha1-eY5ol3gVHIB2tLNg5e3SjNortGg=",
       "dev": true,
+      "optional": true,
       "requires": {
         "anymatch": "1.3.2",
         "async-each": "1.0.1",
@@ -1625,6 +1701,92 @@
       "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
       "dev": true
     },
+    "class-utils": {
+      "version": "0.3.6",
+      "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
+      "integrity": "sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==",
+      "dev": true,
+      "requires": {
+        "arr-union": "3.1.0",
+        "define-property": "0.2.5",
+        "isobject": "3.0.1",
+        "static-extend": "0.1.2"
+      },
+      "dependencies": {
+        "define-property": {
+          "version": "0.2.5",
+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
+          "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
+          "dev": true,
+          "requires": {
+            "is-descriptor": "0.1.6"
+          }
+        },
+        "is-accessor-descriptor": {
+          "version": "0.1.6",
+          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz",
+          "integrity": "sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=",
+          "dev": true,
+          "requires": {
+            "kind-of": "3.2.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "is-data-descriptor": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
+          "integrity": "sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=",
+          "dev": true,
+          "requires": {
+            "kind-of": "3.2.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "is-descriptor": {
+          "version": "0.1.6",
+          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-0.1.6.tgz",
+          "integrity": "sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==",
+          "dev": true,
+          "requires": {
+            "is-accessor-descriptor": "0.1.6",
+            "is-data-descriptor": "0.1.4",
+            "kind-of": "5.1.0"
+          }
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        },
+        "kind-of": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
+          "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
+          "dev": true
+        }
+      }
+    },
     "cli-boxes": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/cli-boxes/-/cli-boxes-1.0.0.tgz",
@@ -1721,6 +1883,16 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
+    "collection-visit": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
+      "integrity": "sha1-S8A3PBZLwykbTTaMgpzxqApZ3KA=",
+      "dev": true,
+      "requires": {
+        "map-visit": "1.0.0",
+        "object-visit": "1.0.1"
+      }
+    },
     "color-convert": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.1.tgz",
@@ -1772,6 +1944,12 @@
         }
       }
     },
+    "component-emitter": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
+      "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
+      "dev": true
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -2014,6 +2192,12 @@
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.5.1.tgz",
       "integrity": "sha1-uCeAl7m8IpNl3lxiz1/K7YtVmeU="
     },
+    "copy-descriptor": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/copy-descriptor/-/copy-descriptor-0.1.1.tgz",
+      "integrity": "sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=",
+      "dev": true
+    },
     "core-js": {
       "version": "2.5.3",
       "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.3.tgz",
@@ -2164,7 +2348,7 @@
         "pbkdf2": "3.0.14",
         "public-encrypt": "4.0.0",
         "randombytes": "2.0.6",
-        "randomfill": "1.0.3"
+        "randomfill": "1.0.4"
       }
     },
     "crypto-random-string": {
@@ -2203,7 +2387,7 @@
       "integrity": "sha1-dUu1v+VUUdpppYuU1F9MWwRi1Y8=",
       "dev": true,
       "requires": {
-        "es5-ext": "0.10.38"
+        "es5-ext": "0.10.39"
       }
     },
     "dargs": {
@@ -2260,6 +2444,12 @@
       "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
       "dev": true
     },
+    "decode-uri-component": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
+      "integrity": "sha1-6zkTMzRYd1y4TNGh+uBiEGu4dUU=",
+      "dev": true
+    },
     "deep-extend": {
       "version": "0.4.2",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.4.2.tgz",
@@ -2281,6 +2471,24 @@
         "strip-bom": "2.0.0"
       }
     },
+    "define-property": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
+      "integrity": "sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==",
+      "dev": true,
+      "requires": {
+        "is-descriptor": "1.0.2",
+        "isobject": "3.0.1"
+      },
+      "dependencies": {
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        }
+      }
+    },
     "del": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/del/-/del-3.0.0.tgz",
@@ -2469,9 +2677,9 @@
       }
     },
     "es5-ext": {
-      "version": "0.10.38",
-      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.38.tgz",
-      "integrity": "sha512-jCMyePo7AXbUESwbl8Qi01VSH2piY9s/a3rSU/5w/MlTIx8HPL1xn2InGN8ejt/xulcJgnTO7vqNtOAxzYd2Kg==",
+      "version": "0.10.39",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.39.tgz",
+      "integrity": "sha512-AlaXZhPHl0po/uxMx1tyrlt1O86M6D5iVaDH8UgLfgek4kXTX6vzsRfJQWC2Ku+aG8pkw1XWzh9eTkwfVrsD5g==",
       "dev": true,
       "requires": {
         "es6-iterator": "2.0.3",
@@ -2485,7 +2693,7 @@
       "dev": true,
       "requires": {
         "d": "1.0.0",
-        "es5-ext": "0.10.38",
+        "es5-ext": "0.10.39",
         "es6-symbol": "3.1.1"
       }
     },
@@ -2496,7 +2704,7 @@
       "dev": true,
       "requires": {
         "d": "1.0.0",
-        "es5-ext": "0.10.38",
+        "es5-ext": "0.10.39",
         "es6-iterator": "2.0.3",
         "es6-set": "0.1.5",
         "es6-symbol": "3.1.1",
@@ -2510,7 +2718,7 @@
       "dev": true,
       "requires": {
         "d": "1.0.0",
-        "es5-ext": "0.10.38",
+        "es5-ext": "0.10.39",
         "es6-iterator": "2.0.3",
         "es6-symbol": "3.1.1",
         "event-emitter": "0.3.5"
@@ -2523,7 +2731,7 @@
       "dev": true,
       "requires": {
         "d": "1.0.0",
-        "es5-ext": "0.10.38"
+        "es5-ext": "0.10.39"
       }
     },
     "es6-weak-map": {
@@ -2533,7 +2741,7 @@
       "dev": true,
       "requires": {
         "d": "1.0.0",
-        "es5-ext": "0.10.38",
+        "es5-ext": "0.10.39",
         "es6-iterator": "2.0.3",
         "es6-symbol": "3.1.1"
       }
@@ -2855,7 +3063,7 @@
       "dev": true,
       "requires": {
         "d": "1.0.0",
-        "es5-ext": "0.10.38"
+        "es5-ext": "0.10.39"
       }
     },
     "events": {
@@ -2928,6 +3136,27 @@
       "integrity": "sha1-p1Xqe8Gt/MWjHOfnYtuq3F5jZEQ=",
       "dev": true
     },
+    "extend-shallow": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
+      "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
+      "dev": true,
+      "requires": {
+        "assign-symbols": "1.0.0",
+        "is-extendable": "1.0.1"
+      },
+      "dependencies": {
+        "is-extendable": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
+          "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
+          "dev": true,
+          "requires": {
+            "is-plain-object": "2.0.4"
+          }
+        }
+      }
+    },
     "external-editor": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-2.1.0.tgz",
@@ -3113,6 +3342,15 @@
         "mime-types": "2.1.17"
       }
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+          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
+          "dev": true,
+          "requires": {
+            "is-glob": "3.1.0",
+            "path-dirname": "1.0.2"
+          },
+          "dependencies": {
+            "is-glob": {
+              "version": "3.1.0",
+              "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
+              "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
+              "dev": true,
+              "requires": {
+                "is-extglob": "2.1.1"
+              }
+            }
+          }
+        },
+        "is-accessor-descriptor": {
+          "version": "0.1.6",
+          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz",
+          "integrity": "sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=",
+          "dev": true,
+          "requires": {
+            "kind-of": "3.2.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "is-data-descriptor": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
+          "integrity": "sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=",
+          "dev": true,
+          "requires": {
+            "kind-of": "3.2.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "is-extglob": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
+          "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=",
+          "dev": true
+        },
+        "is-glob": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.0.tgz",
+          "integrity": "sha1-lSHHaEXMJhCoUgPd8ICpWML/q8A=",
+          "dev": true,
+          "requires": {
+            "is-extglob": "2.1.1"
+          }
+        },
+        "is-number": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-3.0.0.tgz",
+          "integrity": "sha1-JP1iAaR4LPUFYcgQJ2r8fRLXEZU=",
+          "dev": true,
+          "requires": {
+            "kind-of": "3.2.2"
+          },
+          "dependencies": {
+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "dev": true,
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
+          "dev": true
+        },
+        "kind-of": {
+          "version": "6.0.2",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
+          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
+          "dev": true
+        },
+        "micromatch": {
+          "version": "3.1.9",
+          "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-3.1.9.tgz",
+          "integrity": "sha512-SlIz6sv5UPaAVVFRKodKjCg48EbNoIhgetzfK/Cy0v5U52Z6zB136M8tp0UC9jM53LYbmIRihJszvvqpKkfm9g==",
+          "dev": true,
+          "requires": {
+            "arr-diff": "4.0.0",
+            "array-unique": "0.3.2",
+            "braces": "2.3.1",
+            "define-property": "2.0.2",
+            "extend-shallow": "3.0.2",
+            "extglob": "2.0.4",
+            "fragment-cache": "0.2.1",
+            "kind-of": "6.0.2",
+            "nanomatch": "1.2.9",
+            "object.pick": "1.3.0",
+            "regex-not": "1.0.2",
+            "snapdragon": "0.8.1",
+            "to-regex": "3.0.2"
+          }
+        }
       }
     },
     "webidl-conversions": {
@@ -8468,15 +9910,15 @@
       "dev": true
     },
     "webpack": {
-      "version": "3.10.0",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-3.10.0.tgz",
-      "integrity": "sha512-fxxKXoicjdXNUMY7LIdY89tkJJJ0m1Oo8PQutZ5rLgWbV5QVKI15Cn7+/IHnRTd3vfKfiwBx6SBqlorAuNA8LA==",
+      "version": "3.11.0",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-3.11.0.tgz",
+      "integrity": "sha512-3kOFejWqj5ISpJk4Qj/V7w98h9Vl52wak3CLiw/cDOfbVTq7FeoZ0SdoHHY9PYlHr50ZS42OfvzE2vB4nncKQg==",
       "dev": true,
       "requires": {
         "acorn": "5.4.1",
         "acorn-dynamic-import": "2.0.2",
-        "ajv": "5.5.2",
-        "ajv-keywords": "2.1.1",
+        "ajv": "6.2.1",
+        "ajv-keywords": "3.1.0",
         "async": "2.6.0",
         "enhanced-resolve": "3.4.1",
         "escope": "3.6.0",
@@ -8492,11 +9934,28 @@
         "supports-color": "4.5.0",
         "tapable": "0.2.8",
         "uglifyjs-webpack-plugin": "0.4.6",
-        "watchpack": "1.4.0",
+        "watchpack": "1.5.0",
         "webpack-sources": "1.1.0",
         "yargs": "8.0.2"
       },
       "dependencies": {
+        "ajv": {
+          "version": "6.2.1",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.2.1.tgz",
+          "integrity": "sha1-KKarxJOiq+D7TIUHrK7bQ/pVBnE=",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "1.0.0",
+            "fast-json-stable-stringify": "2.0.0",
+            "json-schema-traverse": "0.3.1"
+          }
+        },
+        "ajv-keywords": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.1.0.tgz",
+          "integrity": "sha1-rCsnk5xUPpXSwG5/f1wnvkqlQ74=",
+          "dev": true
+        },
         "camelcase": {
           "version": "4.1.0",
           "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
@@ -8653,9 +10112,9 @@
       }
     },
     "webpack-merge": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.1.1.tgz",
-      "integrity": "sha512-geQsZ86YkXOVOjvPC5yv3JSNnL6/X3Kzh935AQ/gJNEYXEfJDQFu/sdFuktS9OW2JcH/SJec8TGfRdrpHshH7A==",
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.1.2.tgz",
+      "integrity": "sha512-/0QYwW/H1N/CdXYA2PNPVbsxO3u2Fpz34vs72xm03SRfg6bMNGfMJIQEpQjKRvkG2JvT6oRJFpDtSrwbX8Jzvw==",
       "dev": true,
       "requires": {
         "lodash": "4.17.5"
diff --git a/package.json b/package.json
index 05cf97a..7dcd7e2 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "dist"
   ],
   "scripts": {
-    "appveyor:test": "npm run test",
+    "ci:test": "npm run test",
     "prebuild": "npm run clean",
     "build": "cross-env NODE_ENV=production babel src -d dist --ignore 'src/**/*.test.js'",
     "clean": "del-cli dist",
@@ -29,10 +29,10 @@
     "travis:coverage": "npm run test:coverage -- --runInBand",
     "travis:lint": "npm run lint && npm run security",
     "travis:test": "npm run test -- --runInBand",
-    "webpack-defaults": "webpack-defaults"
+    "defaults": "webpack-defaults"
   },
   "dependencies": {
-    "babel-core": "^6.24.1",
+    "babel-core": "^6.26.0",
     "babel-preset-minify": "^0.3.0",
     "webpack-sources": "^1.0.1"
   },
@@ -58,7 +58,7 @@
     "webpack-defaults": "^1.5.0"
   },
   "peerDependencies": {
-    "webpack": "^2.0.0 || ^3.0.0"
+    "webpack": "^2.0.0 || ^3.0.0 || ^4.0.0"
   },
   "keywords": [
     "babel",
diff --git a/src/index.js b/src/index.js
index 765e98b..6fc9ab2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -8,8 +8,90 @@ function getDefault(actualValue, defaultValue) {
   return actualValue !== void 0 ? actualValue : defaultValue;
 }
 
+function optimizeChunkAssets(compilation, options, chunks) {
+  chunks.reduce((acc, chunk) => acc.concat(chunk.files || []), [])
+    .concat(compilation.additionalChunkAssets || [])
+    .filter(ModuleFilenameHelpers.matchObject.bind(null, options))
+    .forEach((file) => {
+      try {
+        const asset = compilation.assets[file];
+
+        if (asset.__babelminified) {
+          compilation.assets[file] = asset.__babelminified;
+          return;
+        }
+
+        let input;
+        let inputSourceMap;
+
+        if (options.sourceMap) {
+          if (asset.sourceAndMap) {
+            const sourceAndMap = asset.sourceAndMap();
+            inputSourceMap = sourceAndMap.map;
+            input = sourceAndMap.source;
+          } else {
+            inputSourceMap = asset.map();
+            input = asset.source();
+          }
+        } else {
+          input = asset.source();
+        }
+
+        // do the transformation
+        const result = options.babel.transform(input, {
+          parserOpts: options.parserOpts,
+          presets: [[options.minifyPreset, options.minifyOpts]],
+          sourceMaps: options.sourceMap,
+          babelrc: false,
+          inputSourceMap,
+          shouldPrintComment(contents) {
+            return shouldPrintComment(contents, options.comments);
+          },
+        });
+
+        asset.__babelminified = compilation.assets[file] = result.map
+          ? new SourceMapSource(result.code, file, result.map, input, inputSourceMap)
+          : new RawSource(result.code);
+      } catch (e) {
+        compilation.errors.push(e);
+      }
+    });
+}
+
+function compilationFn(compilation) {
+  const { options, plugin } = this;
+
+  if (compilation.hooks) {
+    if (options.sourceMap) {
+      compilation.hooks
+        .buildModule
+        .tap(plugin, (module) => { module.useSourceMap = true; });
+    }
+
+    compilation.hooks
+      .optimizeChunkAssets
+      .tapAsync(plugin, (chunks, callback) => {
+        optimizeChunkAssets(compilation, options, chunks);
+        callback();
+      });
+  } else {
+    if (options.sourceMap) {
+      compilation.plugin('build-module', (module) => {
+        module.useSourceMap = true;
+      });
+    }
+
+    compilation.plugin('optimize-chunk-assets', (chunks, callback) => {
+      optimizeChunkAssets(compilation, options, chunks);
+      callback();
+    });
+  }
+}
+
 export default class BabelMinifyPlugin {
   constructor(minifyOpts = {}, pluginOpts = {}) {
+    this.plugin = { name: 'BabelMinifyPlugin' };
+
     this.options = {
       parserOpts: pluginOpts.parserOpts || {},
       minifyPreset: pluginOpts.minifyPreset || babelPresetMinify,
@@ -30,65 +112,13 @@ export default class BabelMinifyPlugin {
     // if sourcemap is not set
     options.sourceMap = getDefault(options.sourceMap, !!compiler.options.devtool);
 
-    compiler.plugin('compilation', (compilation) => {
-      if (options.sourceMap) {
-        compilation.plugin('build-module', (module) => {
-          module.useSourceMap = true;
-        });
-      }
-
-      compilation.plugin('optimize-chunk-assets', (chunks, callback) => {
-        chunks.reduce((acc, chunk) => acc.concat(chunk.files || []), [])
-          .concat(compilation.additionalChunkAssets || [])
-          .filter(ModuleFilenameHelpers.matchObject.bind(null, options))
-          .forEach((file) => {
-            try {
-              const asset = compilation.assets[file];
-
-              if (asset.__babelminified) {
-                compilation.assets[file] = asset.__babelminified;
-                return;
-              }
-
-              let input;
-              let inputSourceMap;
-
-              if (options.sourceMap) {
-                if (asset.sourceAndMap) {
-                  const sourceAndMap = asset.sourceAndMap();
-                  inputSourceMap = sourceAndMap.map;
-                  input = sourceAndMap.source;
-                } else {
-                  inputSourceMap = asset.map();
-                  input = asset.source();
-                }
-              } else {
-                input = asset.source();
-              }
-
-              // do the transformation
-              const result = options.babel.transform(input, {
-                parserOpts: options.parserOpts,
-                presets: [[options.minifyPreset, options.minifyOpts]],
-                sourceMaps: options.sourceMap,
-                babelrc: false,
-                inputSourceMap,
-                shouldPrintComment(contents) {
-                  return shouldPrintComment(contents, options.comments);
-                },
-              });
-
-              asset.__babelminified = compilation.assets[file] = result.map
-                ? new SourceMapSource(result.code, file, result.map, input, inputSourceMap)
-                : new RawSource(result.code);
-            } catch (e) {
-              compilation.errors.push(e);
-            }
-          });
+    if (compiler.hooks) {
+      const { compilation } = compiler.hooks;
 
-        callback();
-      });
-    });
+      compilation.tap(this.plugin, compilationFn.bind(this));
+    } else {
+      compiler.plugin('compilation', compilationFn.bind(this));
+    }
   }
 }
 
diff --git a/test/babel-minify-plugin.test.js b/test/babel-minify-plugin.test.js
index dcb0e5f..93b91a5 100644
--- a/test/babel-minify-plugin.test.js
+++ b/test/babel-minify-plugin.test.js
@@ -155,7 +155,7 @@ function getConfig(opts = {}) {
       path: path.join(__dirname, 'build'),
     },
     plugins: [new BabelMinifyPlugin({}, opts)],
-    devtool: opts.devtool ? opts.devtool : undefined,
+    devtool: opts.devtool ? opts.devtool : false,
   };
 }