build: Add size-limit that shows uppy bundle size and execution time (#1781)

* Add size-limit preset-big-lib

* Update package-lock.json

package.json

@@ -6,6 +6,11 @@
   "lint-staged": {
     "*.js": "eslint"
   },
+  "size-limit": [
+    {
+      "path": "packages/uppy/index.js"
+    }
+  ],
   "pre-commit": "lint:staged",
   "license": "MIT",
   "dependencies": {
@@ -72,6 +77,7 @@
     "@babel/preset-env": "^7.4.5",
     "@babel/register": "^7.4.4",
     "@octokit/rest": "^16.25.0",
+    "@size-limit/preset-big-lib": "^2.1.1",
     "@types/aws-serverless-express": "^3.0.1",
     "@types/compression": "0.0.36",
     "@types/connect-redis": "0.0.7",
@@ -169,7 +175,8 @@
     "verdaccio": "^4.2.1",
     "watchify": "^3.11.1",
     "webdriverio": "^5.0.0",
-    "whatwg-fetch": "3.0.0"
+    "whatwg-fetch": "3.0.0",
+    "webpack": "4.39.1"
   },
   "scripts": {
     "bootstrap": "lerna bootstrap",
@@ -206,6 +213,7 @@
     "test:type": "tsc -p .",
     "test:unit": "npm run build:lib && jest",
     "test:watch": "jest --watch",
+    "test:size": "size-limit",
     "test": "npm-run-all lint test:locale-packs test:unit test:type test:companion",
     "uploadcdn": "node ./bin/upload-to-cdn.js",
     "version": "node ./bin/after-version-bump.js",