build: drop comments to reduce package size (yargs#307)

Author: bcoe

package.json

@@ -61,6 +61,7 @@
     "puppeteer": "^5.2.1",
     "rimraf": "^3.0.2",
     "rollup": "^2.22.1",
+    "rollup-plugin-cleanup": "^3.1.1",
     "serve": "^11.3.2",
     "standardx": "^5.0.0",
     "start-server-and-test": "^1.11.2",

rollup.config.js

@@ -1,3 +1,4 @@
+import cleanup from 'rollup-plugin-cleanup'
 import ts from '@wessberg/rollup-plugin-ts'
 import transformDefaultExport from 'ts-transform-default-export'
 
@@ -17,6 +18,10 @@ export default {
       transformers: ({ program }) => ({
         afterDeclarations: transformDefaultExport(program)
       })
+    }),
+    cleanup({
+      comments: 'none',
+      extensions: ['*']
     })
   ]
 }