Dependency management: Fix stryker and postcss warnings, update to newest postcss version.

Author: dschenk

package-lock.json

@@ -26,7 +26,7 @@
   "dependencies": {
     "deep-get-set": "^1.1.0",
     "kind-of": "^6.0.2",
-    "postcss": "^7.0.7"
+    "postcss": "^7.0.14"
   },
   "devDependencies": {
     "coveralls": "^3.0.2",

package.json

@@ -1,19 +1,12 @@
 module.exports = function(config) {
   config.set({
-    files: [
-      {
-        pattern: "index.js",
-        mutated: true,
-        included: false
-      },
-      "package.json",
-      "test/fixtures/*.css",
-      "test/**/*.js"
+    mutate: [
+      "index.js"
     ],
     testRunner: "jest",
     mutator: "javascript",
     transpilers: [],
-    reporter: ["clear-text", "progress"],
+    reporters: ["clear-text", "progress"],
     coverageAnalysis: "all"
   });
 };

stryker.conf.js

@@ -15,7 +15,7 @@ function run(input, opts = {}) {
     const raw = fs.readFileSync(`./test/fixtures/${input}.css`, 'utf8');
     const expected = fs.readFileSync(`./test/fixtures/${input}.expected.css`, 'utf8');
 
-    return postcss([plugin(opts)]).process(raw)
+    return postcss([plugin(opts)]).process(raw, { from: undefined })
         .then(result => {
             expect(result.css).toEqual(expected);
             expect(result.warnings().length).toBe(0);