chore: windows-compatible npm scripts

package.json

@@ -4,14 +4,14 @@
   "scripts": {
     "dev": "gulp watch",
     "prebuild": "npm run lint && gulp clean",
-    "build": "NODE_ENV=production gulp build",
-    "build:min": "MINIFY=true npm run build",
+    "build": "cross-env NODE_ENV=production gulp build",
+    "build:min": "cross-env MINIFY=true npm run build",
     "analyze": "webpack --profile --json --config scripts/webpack.conf.js | webpack-bundle-size-analyzer",
     "analyze:json": "webpack --profile --json --config scripts/webpack.conf.js > stats.json",
     "i18n": "gulp i18n",
     "lint": "eslint --ext .js,.vue .",
     "svgo": "svgo --config .svgo.yml icons",
-    "pretest": "NODE_ENV=test webpack --config scripts/webpack.test.conf.js",
+    "pretest": "cross-env NODE_ENV=test webpack --config scripts/webpack.test.conf.js",
     "test": "node dist/test",
     "prepush": "npm run lint"
   },
@@ -24,6 +24,7 @@
     "babel-plugin-transform-export-extensions": "^6.22.0",
     "babel-plugin-transform-runtime": "^6.23.0",
     "babel-preset-env": "^1.6.0",
+    "cross-env": "^5.0.5",
     "css-loader": "^0.28.7",
     "del": "^3.0.0",
     "eslint": "^4.6.1",