build: try script for install webp on travis

Author: Sam H

build.js

@@ -0,0 +1,16 @@
+var sys = require('sys')
+var exec = require('child_process').exec;
+function puts(error, stdout, stderr) { sys.puts(stdout) }
+
+var os = require('os');
+//control OS
+//then run command depengin on the OS
+
+if (os.type() === 'Linux')
+   exec("npm run build-linux-webp", puts);
+else if (os.type() === 'Darwin')
+   exec("node build-mac.js", puts);
+else if (os.type() === 'Windows_NT')
+   exec("node build-windows.js", puts);
+else
+   throw new Error("Unsupported OS found: " + os.type());

package.json

@@ -8,6 +8,7 @@
   ],
   "scripts": {
     "build": "stencil build --prerender",
+    "build2": "node build.js",
     "cz": "git-cz",
     "dev": "sd concurrent \"stencil build --dev --watch --no-cache\" \"stencil-dev-server\" ",
     "lint": "tslint -p ./tsconfig.json --exclude '**/*.d.ts'",
@@ -17,12 +18,12 @@
     "test.watch": "jest --watch --no-cache",
     "cypress": "cypress open",
     "version": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0 && git add CHANGELOG.md",
+    "build-linux-webp": "sudo apt install webp",
     "st:generate": "node scripts/st-generate.js",
-    "install-webp": "brew install webp",
     "jpg-webp": "for file in src/assets/*.jpg; do cwebp -q 75 \"$file\" -o \"${file%.jpg}.webp\"; done",
     "png-webp": "for file in src/assets/*.png; do cwebp -q 75 \"$file\" -o \"${file%.png}.webp\"; done",
     "jpeg-webp": "for file in src/assets/*.jpeg; do cwebp -q 75 \"$file\" -o \"${file%.jpeg}.webp\"; done",
-    "prepublish": "npm run install-webp && jpg-webp && npm run png-webp && npm run jpeg-webp && stencil build --prod",
+    "prepublish": "npm run build2 && jpg-webp && npm run png-webp && npm run jpeg-webp && stencil build --prod",
     "firebase:deploy": "node scripts/deploy.js",
     "firebase:deploy:dev": "firebase use default && firebase deploy --token \"$FIREBASE_TOKEN\"",
     "firebase:deploy:prod": "firebase use production && firebase deploy --token \"$FIREBASE_TOKEN\""