build: update webpack and postcss

Update `webpack` to `4.28.4` and `postcss` to `7.0.11`

Author: Alan Agius

packages/angular_devkit/build_angular/package.json

@@ -29,7 +29,7 @@
     "minimatch": "3.0.4",
     "parse5": "4.0.0",
     "opn": "5.4.0",
-    "postcss": "7.0.7",
+    "postcss": "7.0.11",
     "postcss-import": "12.0.1",
     "postcss-loader": "3.0.0",
     "raw-loader": "1.0.0",
@@ -45,7 +45,7 @@
     "stylus-loader": "3.0.2",
     "tree-kill": "1.2.1",
     "terser-webpack-plugin": "1.2.1",
-    "webpack": "4.28.2",
+    "webpack": "4.28.4",
     "webpack-dev-middleware": "3.5.0",
     "webpack-dev-server": "3.1.14",
     "webpack-merge": "4.2.1",

packages/angular_devkit/build_angular/src/angular-cli-files/plugins/postcss-cli-resources.ts

@@ -169,7 +169,8 @@ export default postcss.plugin('postcss-cli-resources', (options: PostcssCliResou
       let modified = false;
 
       // We want to load it relative to the file that imports
-      const context = path.dirname(decl.source.input.file);
+      const inputFile = decl.source && decl.source.input.file;
+      const context = inputFile && path.dirname(inputFile) || loader.context;
 
       // tslint:disable-next-line:no-conditional-assignment
       while (match = urlRegex.exec(value)) {

yarn.lock

@@ -7668,14 +7668,14 @@ postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.1:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz#9ff822547e2893213cf1c30efa51ac5fd1ba8281"
   integrity sha512-pISE66AbVkp4fDQ7VHBwRNXzAAKJjw4Vw7nWI/+Q3vuly7SNfgYXvm6i5IgFylHGK5sP/xHAbB7N49OS4gWNyQ==
 
-postcss@7.0.7:
-  version "7.0.7"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.7.tgz#2754d073f77acb4ef08f1235c36c5721a7201614"
-  integrity sha512-HThWSJEPkupqew2fnuQMEI2YcTj/8gMV3n80cMdJsKxfIh5tHf7nM5JigNX6LxVMqo6zkgQNAI88hyFvBk41Pg==
+postcss@7.0.11, postcss@^7.0.11:
+  version "7.0.11"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.11.tgz#f63c513b78026d66263bb2ca995bf02e3d1a697d"
+  integrity sha512-9AXb//5UcjeOEof9T+yPw3XTa5SL207ZOIC/lHYP4mbUTEh4M0rDAQekQpVANCZdwQwKhBtFZCk3i3h3h2hdWg==
   dependencies:
-    chalk "^2.4.1"
+    chalk "^2.4.2"
     source-map "^0.6.1"
-    supports-color "^5.5.0"
+    supports-color "^6.1.0"
 
 postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.2, postcss@^7.0.5:
   version "7.0.5"
@@ -7686,15 +7686,6 @@ postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.2, postcss@^7.0.5:
     source-map "^0.6.1"
     supports-color "^5.5.0"
 
-postcss@^7.0.11:
-  version "7.0.11"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.11.tgz#f63c513b78026d66263bb2ca995bf02e3d1a697d"
-  integrity sha512-9AXb//5UcjeOEof9T+yPw3XTa5SL207ZOIC/lHYP4mbUTEh4M0rDAQekQpVANCZdwQwKhBtFZCk3i3h3h2hdWg==
-  dependencies:
-    chalk "^2.4.2"
-    source-map "^0.6.1"
-    supports-color "^6.1.0"
-
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
@@ -10531,10 +10522,10 @@ webpack-subresource-integrity@1.1.0-rc.6:
   dependencies:
     webpack-core "^0.6.8"
 
-webpack@4.28.2, webpack@^4.0.0, webpack@^4.6.0:
-  version "4.28.2"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.28.2.tgz#6b534a8bc91a45787ed631dc2e87aec94e9e4db7"
-  integrity sha512-PK3uVg3/NuNVOjPfYleFI6JF7khO7c2kIlksH7mivQm+QDcwiqV1x6+q89dDeOioh5FNxJHr3LKbDu3oSAhl9g==
+webpack@4.28.4, webpack@^4.0.0, webpack@^4.6.0:
+  version "4.28.4"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.28.4.tgz#1ddae6c89887d7efb752adf0c3cd32b9b07eacd0"
+  integrity sha512-NxjD61WsK/a3JIdwWjtIpimmvE6UrRi3yG54/74Hk9rwNj5FPkA4DJCf1z4ByDWLkvZhTZE+P3C/eh6UD5lDcw==
   dependencies:
     "@webassemblyjs/ast" "1.7.11"
     "@webassemblyjs/helper-module-context" "1.7.11"