#290 Delete unnecessary .js extension in npm scripts

package.json

@@ -23,16 +23,16 @@
     "storybook": "start-storybook -s ./node_modules/@salesforce-ux/design-system -p 9001 -c .storybook",
     "test": "npm-run-all type-check test:jest test:storyshots",
     "test:storyshots": "NODE_ENV=test jest test/storyshots/*.test.js",
-    "test:jest": "jest test/*-spec.js test/*-spec.tsx",
+    "test:jest": "jest test/*-spec.tsx",
     "prepublish": "npm run build",
     "type-check": "tsc --noEmit",
     "type-check:watch": "npm run type-check -- --watch",
     "format": "npm run lint:src -- --fix && npm run lint:stories -- --fix && npm run lint:test -- --fix",
     "lint": "npm run lint:src && npm run lint:stories && npm run lint:test",
-    "lint:src": "eslint --ext .js,.jsx,.ts,.tsx src/scripts/**",
-    "lint:stories": "eslint --ext .js,.jsx,.ts,.tsx stories/**",
-    "lint:test": "eslint --ext .js,.jsx,.ts,.tsx test/**",
-    "build": "babel -d lib/ src/ --extensions \".js,.ts,.tsx\"",
+    "lint:src": "eslint --ext .ts,.tsx src/scripts/**",
+    "lint:stories": "eslint --ext .ts,.tsx stories/**",
+    "lint:test": "eslint --ext .js,.ts,.tsx test/**",
+    "build": "babel -d lib/ src/ --extensions \".ts,.tsx\"",
     "build:assets": "cp -r node_modules/@salesforce-ux/design-system/assets public",
     "build:storybook": "build-storybook -o public",
     "deploy": "npm-run-all build:storybook build:assets deploy:ghpage",