diff --git a/.gitignore b/.gitignore
index 4d88ed9..fee8225 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ node_modules
 /dist
 *.log
 /test/output/
+.idea
+.vscode
diff --git a/package.json b/package.json
index 8e80093..2d3a41d 100644
--- a/package.json
+++ b/package.json
@@ -32,13 +32,12 @@
   "homepage": "https://github.com/vuejs/vue-component-compiler#readme",
   "devDependencies": {
     "@types/clean-css": "^3.4.30",
-    "@types/jest": "^22.2.3",
+    "@types/jest": "^25.2.3",
     "@types/node": "^9.4.7",
     "babel-plugin-external-helpers": "^6.22.0",
     "babel-preset-env": "^1.6.1",
     "conventional-changelog": "^1.1.24",
     "jest": "^22.4.2",
-    "sass": "^1.18.0",
     "pug": "^2.0.3",
     "puppeteer": "^1.3.0",
     "rollup": "^0.58.2",
@@ -46,6 +45,7 @@
     "rollup-plugin-commonjs": "^9.1.0",
     "rollup-plugin-image": "^1.0.2",
     "rollup-plugin-node-resolve": "^3.3.0",
+    "sass": "^1.18.0",
     "ts-jest": "^22.4.2",
     "typescript": "^3.2.4",
     "typescript-eslint-parser": "^15.0.0",
@@ -53,9 +53,9 @@
     "vue-template-compiler": "^2.5.16"
   },
   "optionalDependencies": {
-    "sass": "^1.18.0",
-    "pug": "^2.0.3",
     "less": "^3.9.0",
+    "pug": "^2.0.3",
+    "sass": "^1.18.0",
     "stylus": "^0.54.5"
   },
   "peerDependencies": {
diff --git a/src/compiler.ts b/src/compiler.ts
index a8bbc29..ff14650 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -232,9 +232,6 @@ export class SFCCompiler {
     const postcssPlugins = (this.style.postcssPlugins || [])
       .slice()
       .concat([
-        needsCleanCSS
-          ? postcssClean(this.style.postcssCleanOptions)
-          : undefined,
         needsCSSModules
           ? postcssModules({
               generateScopedName: '[path][local]-[hash:base64:4]',
@@ -244,9 +241,12 @@ export class SFCCompiler {
               }
             })
           : undefined,
+        needsCleanCSS
+          ? postcssClean(this.style.postcssCleanOptions)
+          : undefined,
       ])
       .filter(Boolean)
-    
+
     const preprocessOptions =
       (style.lang &&
         this.style.preprocessOptions &&
diff --git a/src/postcss-clean.ts b/src/postcss-clean.ts
index 13e9304..b2bbd36 100644
--- a/src/postcss-clean.ts
+++ b/src/postcss-clean.ts
@@ -1,7 +1,7 @@
 import * as postcss from 'postcss'
-import CleanCSS = require('clean-css')
+import CleanCSS from 'clean-css'
 
-export default postcss.plugin('clean', options => {
+export default postcss.plugin('clean', (options: any) => {
   const clean = new CleanCSS({ compatibility: 'ie9', ...options })
 
   return (css: any, res: any) => {
diff --git a/test/compile.spec.ts b/test/compile.spec.ts
index 00e3a99..d6a6b85 100644
--- a/test/compile.spec.ts
+++ b/test/compile.spec.ts
@@ -60,3 +60,64 @@ function removeRawResult(result: DescriptorCompileResult): DescriptorCompileResu
 
   return result
 }
+
+describe('when source contains css module', () => {
+  const componentSource = `
+    <template>
+      <h1 id="test" :class="$style.title">Hello {{ name }}!</h1>
+    </template>
+
+    <script>
+    export default {
+      data () {
+        return { name: 'John Doe' }
+      }
+    }
+    </script>
+
+    <style module>
+    .title {
+      color: red;
+    }
+    </style>
+    `
+
+
+  describe('production mode', () => {
+    const prodCompiler = createDefaultCompiler(({
+      template: {
+        isProduction: true
+      }
+    }) as any)
+
+    it('should generate deterministic class names when the same component is compiled multiple times', () => {
+
+      const result1 = prodCompiler.compileToDescriptor('foo.vue', componentSource)
+      const result2 = prodCompiler.compileToDescriptor('foo.vue', componentSource)
+
+      const styles1 = result1.styles[0].code;
+      const styles2 = result2.styles[0].code;
+
+      expect(styles1).toEqual(styles2)
+    })
+  })
+
+  describe('develop mode', () => {
+    const devCompiler = createDefaultCompiler(({
+      template: {
+        isProduction: false
+      }
+    }) as any)
+
+    it('should generate deterministic class names when the same component is compiled multiple times', () => {
+
+      const result1 = devCompiler.compileToDescriptor('foo.vue', componentSource)
+      const result2 = devCompiler.compileToDescriptor('foo.vue', componentSource)
+
+      const styles1 = result1.styles[0].code;
+      const styles2 = result2.styles[0].code;
+
+      expect(styles1).toEqual(styles2)
+    })
+  })
+})
diff --git a/tsconfig.json b/tsconfig.json
index 975a579..a74a79f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,7 +13,8 @@
     "strictNullChecks": true,
     "noImplicitAny": true,
     "removeComments": false,
-    "lib": ["es6", "es7"]
+    "lib": ["es6", "es7"],
+    "types": ["@types/jest", "node"]
   },
   "include": ["src", "typings"]
 }
diff --git a/yarn.lock b/yarn.lock
index 220aff5..03c6e59 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -16,6 +16,16 @@
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
+"@jest/types@^25.5.0":
+  version "25.5.0"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-25.5.0.tgz#4d6a4793f7b9599fc3680877b856a97dbccf2a9d"
+  integrity sha512-OXD0RgQ86Tu3MazKo8bnrkDRaDXXMGUqd+kTtLtK1Zb7CRzQcaSRPPPV37SvYTdevXEBVxe0HXylEjs8ibkmCw==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^1.1.1"
+    "@types/yargs" "^15.0.0"
+    chalk "^3.0.0"
+
 "@types/babel-types@*", "@types/babel-types@^7.0.0":
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/@types/babel-types/-/babel-types-7.0.1.tgz#1405e5396968c4302994b0161ce405b72b874257"
@@ -30,13 +40,42 @@
   version "3.4.30"
   resolved "https://registry.yarnpkg.com/@types/clean-css/-/clean-css-3.4.30.tgz#0052c136f5248002428e3638b37de4a39818641d"
 
+"@types/color-name@^1.1.1":
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
+  integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
+
 "@types/estree@0.0.38":
   version "0.0.38"
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.38.tgz#c1be40aa933723c608820a99a373a16d215a1ca2"
 
-"@types/jest@^22.2.3":
-  version "22.2.3"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-22.2.3.tgz#0157c0316dc3722c43a7b71de3fdf3acbccef10d"
+"@types/istanbul-lib-coverage@*", "@types/istanbul-lib-coverage@^2.0.0":
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.2.tgz#79d7a78bad4219f4c03d6557a1c72d9ca6ba62d5"
+  integrity sha512-rsZg7eL+Xcxsxk2XlBt9KcG8nOp9iYdKCOikY9x2RFJCyOdNj4MKPQty0e8oZr29vVAzKXr1BmR+kZauti3o1w==
+
+"@types/istanbul-lib-report@*":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/istanbul-lib-report/-/istanbul-lib-report-3.0.0.tgz#c14c24f18ea8190c118ee7562b7ff99a36552686"
+  integrity sha512-plGgXAPfVKFoYfa9NpYDAkseG+g6Jr294RqeqcqDixSbU34MZVJRi/P+7Y8GDpzkEwLaGZZOpKIEmeVZNtKsrg==
+  dependencies:
+    "@types/istanbul-lib-coverage" "*"
+
+"@types/istanbul-reports@^1.1.1":
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/@types/istanbul-reports/-/istanbul-reports-1.1.2.tgz#e875cc689e47bce549ec81f3df5e6f6f11cfaeb2"
+  integrity sha512-P/W9yOX/3oPZSpaYOCQzGqgCQRXn0FFO/V8bWrCQs+wLmvVVxk6CRBXALEvNs9OHIatlnlFokfhuDo2ug01ciw==
+  dependencies:
+    "@types/istanbul-lib-coverage" "*"
+    "@types/istanbul-lib-report" "*"
+
+"@types/jest@^25.2.3":
+  version "25.2.3"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-25.2.3.tgz#33d27e4c4716caae4eced355097a47ad363fdcaf"
+  integrity sha512-JXc1nK/tXHiDhV55dvfzqtmP4S3sy3T3ouV2tkViZgxY/zeUkcpQcQPGRlgF4KmWzWW5oiWYSZwtCB+2RsE4Fw==
+  dependencies:
+    jest-diff "^25.2.1"
+    pretty-format "^25.2.1"
 
 "@types/node@*":
   version "10.0.0"
@@ -46,6 +85,18 @@
   version "9.6.7"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-9.6.7.tgz#5f3816d1db2155edcde1b2e3aa5d0e5c520cb564"
 
+"@types/yargs-parser@*":
+  version "15.0.0"
+  resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-15.0.0.tgz#cb3f9f741869e20cce330ffbeb9271590483882d"
+  integrity sha512-FA/BWv8t8ZWJ+gEOnLLd8ygxH/2UFbAvgEonyfN6yWGLKc7zVjbpl2Y4CTjid9h2RfgPP6SEt6uHwEOply00yw==
+
+"@types/yargs@^15.0.0":
+  version "15.0.5"
+  resolved "https://registry.yarnpkg.com/@types/yargs/-/yargs-15.0.5.tgz#947e9a6561483bdee9adffc983e91a6902af8b79"
+  integrity sha512-Dk/IDOPtOgubt/IaevIUbTgV7doaKkoorvOyYM2CMwuDyP89bekI7H4xLIwunNYiK9jhCkmc6pUrJk3cj2AB9w==
+  dependencies:
+    "@types/yargs-parser" "*"
+
 "@vue/component-compiler-utils@^3.0.0":
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/@vue/component-compiler-utils/-/component-compiler-utils-3.0.0.tgz#d16fa26b836c06df5baaeb45f3d80afc47e35634"
@@ -140,6 +191,11 @@ ansi-regex@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
 
+ansi-regex@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-5.0.0.tgz#388539f55179bf39339c81af30a654d69f87cb75"
+  integrity sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==
+
 ansi-styles@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
@@ -151,6 +207,14 @@ ansi-styles@^3.2.0, ansi-styles@^3.2.1:
   dependencies:
     color-convert "^1.9.0"
 
+ansi-styles@^4.0.0, ansi-styles@^4.1.0:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.2.1.tgz#90ae75c424d008d2624c5bf29ead3177ebfcf359"
+  integrity sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==
+  dependencies:
+    "@types/color-name" "^1.1.1"
+    color-convert "^2.0.1"
+
 anymatch@^1.3.0:
   version "1.3.2"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-1.3.2.tgz#553dcb8f91e3c889845dfdba34c77721b90b9d7a"
@@ -991,6 +1055,14 @@ chalk@^2.3.2, chalk@^2.4.2:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
+chalk@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-3.0.0.tgz#3f73c2bf526591f574cc492c51e2456349f844e4"
+  integrity sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==
+  dependencies:
+    ansi-styles "^4.1.0"
+    supports-color "^7.1.0"
+
 character-parser@^2.1.1:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/character-parser/-/character-parser-2.2.0.tgz#c7ce28f36d4bcd9744e5ffc2c5fcde1c73261fc0"
@@ -1097,11 +1169,23 @@ color-convert@^1.9.0:
   dependencies:
     color-name "1.1.3"
 
+color-convert@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-2.0.1.tgz#72d3a68d598c9bdb3af2ad1e84f21d896abd4de3"
+  integrity sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==
+  dependencies:
+    color-name "~1.1.4"
+
 color-name@1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
   integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
 
+color-name@~1.1.4:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.4.tgz#c2a09a87acbde69543de6f63fa3995c826c536a2"
+  integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
+
 combined-stream@1.0.6, combined-stream@~1.0.5:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.6.tgz#723e7df6e801ac5613113a7e445a9b69cb632818"
@@ -1502,6 +1586,11 @@ detect-newline@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/detect-newline/-/detect-newline-2.1.0.tgz#f41f1c10be4b00e87b5f13da680759f2c5bfd3e2"
 
+diff-sequences@^25.2.6:
+  version "25.2.6"
+  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-25.2.6.tgz#5f467c00edd35352b7bca46d7927d60e687a76dd"
+  integrity sha512-Hq8o7+6GaZeoFjtpgvRBUknSXNeJiCx7V9Fr94ZMljNiCr9n9L8H8aJqgWOQiDDGdyn29fRNcDdRVJ5fdyihfg==
+
 diff@^3.2.0:
   version "3.5.0"
   resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
@@ -2060,6 +2149,11 @@ has-flag@^3.0.0:
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
   integrity sha1-tdRU3CGZriJWmfNGfloH87lVuv0=
 
+has-flag@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-4.0.0.tgz#944771fd9c81c81265c4d6941860da06bb59479b"
+  integrity sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==
+
 has-unicode@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/has-unicode/-/has-unicode-2.0.1.tgz#e0e6fe6a28cf51138855e086d1691e771de2a8b9"
@@ -2632,6 +2726,16 @@ jest-diff@^22.4.3:
     jest-get-type "^22.4.3"
     pretty-format "^22.4.3"
 
+jest-diff@^25.2.1:
+  version "25.5.0"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-25.5.0.tgz#1dd26ed64f96667c068cef026b677dfa01afcfa9"
+  integrity sha512-z1kygetuPiREYdNIumRpAHY6RXiGmp70YHptjdaxTWGmA085W3iCnXNx0DhflK3vwrKmrRWyY1wUpkPMVxMK7A==
+  dependencies:
+    chalk "^3.0.0"
+    diff-sequences "^25.2.6"
+    jest-get-type "^25.2.6"
+    pretty-format "^25.5.0"
+
 jest-docblock@^22.4.3:
   version "22.4.3"
   resolved "https://registry.yarnpkg.com/jest-docblock/-/jest-docblock-22.4.3.tgz#50886f132b42b280c903c592373bb6e93bb68b19"
@@ -2657,6 +2761,11 @@ jest-get-type@^22.4.3:
   version "22.4.3"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-22.4.3.tgz#e3a8504d8479342dd4420236b322869f18900ce4"
 
+jest-get-type@^25.2.6:
+  version "25.2.6"
+  resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-25.2.6.tgz#0b0a32fab8908b44d508be81681487dbabb8d877"
+  integrity sha512-DxjtyzOHjObRM+sM1knti6or+eOgcGU4xVSb2HNP1TqO4ahsT+rqZg+nyqHWJSvWgKC5cG3QjGFBqxLghiF/Ig==
+
 jest-haste-map@^22.4.3:
   version "22.4.3"
   resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-22.4.3.tgz#25842fa2ba350200767ac27f658d58b9d5c2e20b"
@@ -3764,6 +3873,16 @@ pretty-format@^22.4.3:
     ansi-regex "^3.0.0"
     ansi-styles "^3.2.0"
 
+pretty-format@^25.2.1, pretty-format@^25.5.0:
+  version "25.5.0"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-25.5.0.tgz#7873c1d774f682c34b8d48b6743a2bf2ac55791a"
+  integrity sha512-kbo/kq2LQ/A/is0PQwsEHM7Ca6//bGPPvU6UnsdDRSKTWxT/ru/xb88v4BJf6a69H+uTytOEsTusT9ksd/1iWQ==
+  dependencies:
+    "@jest/types" "^25.5.0"
+    ansi-regex "^5.0.0"
+    ansi-styles "^4.0.0"
+    react-is "^16.12.0"
+
 private@^0.1.6, private@^0.1.8:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"
@@ -3948,6 +4067,11 @@ rc@^1.2.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
+react-is@^16.12.0:
+  version "16.13.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
+  integrity sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==
+
 read-pkg-up@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-1.0.1.tgz#9d63c13276c065918d57f002a57f40a1b643fb02"
@@ -4612,6 +4736,13 @@ supports-color@^6.1.0:
   dependencies:
     has-flag "^3.0.0"
 
+supports-color@^7.1.0:
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-7.1.0.tgz#68e32591df73e25ad1c4b49108a2ec507962bfd1"
+  integrity sha512-oRSIpR8pxT1Wr2FquTNnGet79b3BWljqOuoW/h4oBhxJ/HUbX5nX6JSruTkvXDCFMwDPvsaTTbvMLKZWSy0R5g==
+  dependencies:
+    has-flag "^4.0.0"
+
 symbol-tree@^3.2.2:
   version "3.2.2"
   resolved "https://registry.yarnpkg.com/symbol-tree/-/symbol-tree-3.2.2.tgz#ae27db38f660a7ae2e1c3b7d1bc290819b8519e6"