fix(umd): fix umd build imports

Closes #68

Author: Matt Lewis

package.json

@@ -91,6 +91,7 @@
     "source-map-loader": "~0.1.5",
     "sourcemap-istanbul-instrumenter-loader": "~0.2.0",
     "standard-version": "~3.0.0",
+    "string-replace-loader": "~1.0.5",
     "style-loader": "~0.13.0",
     "stylelint": "~7.3.1",
     "stylelint-config-standard": "~13.0.0",
@@ -126,7 +127,7 @@
   "dependencies": {
     "@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.0",
     "@types/date-fns": "0.0.2",
-    "calendar-utils": "0.0.30",
+    "calendar-utils": "0.0.31",
     "date-fns": "^1.3.0"
   }
 }

webpack.config.umd.ts

@@ -70,6 +70,16 @@ module.exports = {
       enforce: 'pre',
       test: /ng\-bootstrap\/util\/positioning/,
       loader: 'source-map-loader'
+    }, {
+      enforce: 'pre',
+      test: /\.ts$/,
+      exclude: /node_modules/,
+      loader: 'string-replace-loader',
+      options: {
+        search: `import (\\w+) from \\'date\\-fns\\/`, // nasty fix for umd build to work
+        replace: 'import * as $1 from \'date-fns/',
+        flags: 'g'
+      }
     }, {
       test: /\.ts$/,
       loader: 'awesome-typescript-loader',