Migrate to yarn to install packages without package.json (but keep npm rebuild)

.npmrc

@@ -0,0 +1 @@
+engine-strict=true

.travis.yml

@@ -31,9 +31,9 @@ script:
         -v ~/.cache/electron:/root/.cache/electron \
         -v ~/.cache/electron-builder:/root/.cache/electron-builder \
         electronuserland/builder \
-        /bin/bash -c "npm install && npm run release:linux"
+        /bin/bash -c "yarn && yarn run release:linux"
     else
-      npm run release:mac
+      yarn run release:mac
     fi
 before_cache:
   - rm -rf $HOME/.cache/electron-builder

appveyor.yml

@@ -12,9 +12,9 @@ init:
 
 install:
   - ps: Install-Product node 8 x64
-  - npm install
+  - yarn
 
 build_script:
-  - npm run release:win
+  - yarn run release:win
 
 test: off

package.json

@@ -29,14 +29,17 @@
 		"test": "xo",
 		"start": "electron .",
 		"icon": "rimraf assets/generated && electron-icon-maker --input=assets/youtube-music.png --output=assets/generated",
-		"postinstall": "npm run icon && npm rebuild && node plugins/adblocker/generator.js && electron-rebuild",
+		"postinstall": "yarn run icon && npm rebuild && node plugins/adblocker/generator.js && electron-rebuild",
 		"clean": "rimraf dist",
-		"build": "npm run clean && build --win --mac --linux",
-		"build:mac": "npm run clean && build --mac",
-		"build:win": "npm run clean && build --win",
-		"release:linux": "npm run clean && build --linux -p always",
-		"release:mac": "npm run clean && build --mac -p always",
-		"release:win": "npm run clean && build --win -p always"
+		"build": "yarn run clean && build --win --mac --linux",
+		"build:mac": "yarn run clean && build --mac",
+		"build:win": "yarn run clean && build --win",
+		"release:linux": "yarn run clean && build --linux -p always",
+		"release:mac": "yarn run clean && build --mac -p always",
+		"release:win": "yarn run clean && build --win -p always"
+	},
+	"engines": {
+		"npm": "Please use yarn and not npm"
 	},
 	"dependencies": {
 		"ad-block": "^4.1.3",

readme.md

@@ -29,8 +29,8 @@ You can check out the [latest release](https://github.com/th-ch/youtube-music/re
 ```sh
 git clone https://github.com/th-ch/youtube-music
 cd youtube-music
-npm install
-npm start
+yarn
+yarn start
 ```
 
 ## Build your own plugins
@@ -90,7 +90,7 @@ module.exports = () => {
 ## Build
 
 ```sh
-npm run build
+yarn build
 ```
 
 Builds the app for macOS, Linux, and Windows, using [electron-builder](https://github.com/electron-userland/electron-builder).