console: make variables and checks stricter

PR-URL: #17707
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: BridgeAR

lib/console.js

@@ -52,7 +52,7 @@ function Console(stdout, stderr, ignoreErrors = true) {
   Object.defineProperty(this, '_stdout', prop);
   prop.value = stderr;
   Object.defineProperty(this, '_stderr', prop);
-  prop.value = ignoreErrors;
+  prop.value = Boolean(ignoreErrors);
   Object.defineProperty(this, '_ignoreErrors', prop);
   prop.value = new Map();
   Object.defineProperty(this, '_times', prop);
@@ -80,7 +80,7 @@ function createWriteErrorHandler(stream) {
     // This conditional evaluates to true if and only if there was an error
     // that was not already emitted (which happens when the _write callback
     // is invoked asynchronously).
-    if (err && !stream._writableState.errorEmitted) {
+    if (err !== null && !stream._writableState.errorEmitted) {
       // If there was an error, it will be emitted on `stream` as
       // an `error` event. Adding a `once` listener will keep that error
       // from becoming an uncaught exception, but since the handler is
@@ -102,7 +102,7 @@ function write(ignoreErrors, stream, string, errorhandler, groupIndent) {
   }
   string += '\n';
 
-  if (!ignoreErrors) return stream.write(string);
+  if (ignoreErrors === false) return stream.write(string);
 
   // There may be an error occurring synchronously (e.g. for files or TTYs
   // on POSIX systems) or asynchronously (e.g. pipes on POSIX systems), so