Add --warnings CLI switch to print renderer warnings

See #166

Author: inukshuk

lib/run.js

@@ -85,6 +85,13 @@ exports.builder = yargs => {
         implies: 'renderer',
         type: 'string',
         requiresArg: true
+      },
+      warnings: {
+        alias: 'W',
+        describe: 'Print renderer warnings to console',
+        group: 'Electron',
+        type: 'boolean',
+        default: false
       }
     })
     .check(argv => {
@@ -190,7 +197,11 @@ exports.handler = async argv => {
       })
       ipc.on('mocha-warn', (_, warning) => warn(warning))
 
-      ipc.on('console-call', print)
+      ipc.on('console-call', (_, method, args) => {
+        if (method !== 'warn' || argv.warnings) {
+          print(method, args)
+        }
+      })
 
       // Undocumented call in electron-window
       win._loadURLWithArgs(
@@ -231,7 +242,7 @@ const warn = warning => {
   console.warn(ansi.yellow(`Warning: ${warning.message}`))
 }
 
-const print = (_, method, args) => {
+const print = (method, args) => {
   const output = util.format.apply(null, args)
   console[method](output)
 }