refactor(@embark/core/console): silence errors when autocomplete is attempted on bad reference

Previously, in the embark cli dashboard/console, if you were to type `Foo.` and
hit tab for autocomplete then (assuming you hadn't defined `Foo`) there would
be unhandled errors and the console could even become unusable.

Refactor `packages/core/console` and related code so that nothing happens when
you attempt to autocomplete a bad reference (the same behavior as Node's own
REPL).

packages/core/code-runner/src/index.ts

@@ -52,7 +52,7 @@ class CodeRunner {
     this.vm.registerVar(varName, code, cb);
   }
 
-  private evalCode(code: string, cb: Callback<any>, tolerateError = false) {
+  private evalCode(code: string, cb: Callback<any>, tolerateError = false, logCode = true, logError = true) {
     cb = cb || (() => { });
 
     if (!code) {
@@ -61,8 +61,12 @@ class CodeRunner {
 
     this.vm.doEval(code, tolerateError, (err, result) => {
       if (err) {
-        this.logger.error(__("Error running code: %s", code));
-        this.logger.error(err.toString());
+        if (logCode) {
+          this.logger.error(__("Error running code: %s", code));
+        }
+        if (logError) {
+          this.logger.error(err.toString());
+        }
         return cb(err);
       }
 

packages/core/console/src/lib/index.ts

@@ -47,13 +47,18 @@ class Console {
 
     if (this.ipc.isServer()) {
       this.ipc.on("console:executeCmd", (cmd: string, cb: any) => {
-        this.executeCmd(cmd, (err: string, result: any) => {
-          let error = null;
+        this.executeCmd(cmd, (err: any, result: any) => {
           if (err) {
             // reformat for IPC reply
-            error = { name: "Console error", message: err, stack: err };
+            err = { name: "Console error", message: err, stack: err.stack };
+            return cb(err);
           }
-          cb(error, util.inspect(result));
+          cb(null, util.inspect(result));
+        });
+      });
+      this.ipc.on("console:executePartial", (cmd: string, cb: any) => {
+        this.executePartial(cmd, (_: any, result: any) => {
+          cb(null, util.inspect(result));
         });
       });
       this.ipc.on("console:history:save", true, (cmd: string) => {
@@ -70,6 +75,7 @@ class Console {
       if (cb) { cb(); }
     });
     this.events.setCommandHandler("console:executeCmd", this.executeCmd.bind(this));
+    this.events.setCommandHandler("console:executePartial", this.executePartial.bind(this));
     this.events.setCommandHandler("console:history", (cb: any) => this.getHistory(this.cmdHistorySize(), cb));
     this.registerConsoleCommands();
 
@@ -149,7 +155,19 @@ class Console {
     return false;
   }
 
-  private executeCmd(cmd: string, callback: any) {
+  private executePartial(cmd: string, callback: any) {
+    // if this is the embark console process, send the command to the process
+    // running all the needed services (ie the process running `embark run`)
+    if (this.isEmbarkConsole) {
+      return this.ipc.request("console:executePartial", cmd, callback);
+    }
+
+    this.executeCmd(cmd, (_: any, result: any) => {
+      callback(null, result);
+    });
+  }
+
+  private executeCmd(cmd: string, callback?: any, logEvalCode = false, logEvalError = false) {
     // if this is the embark console process, send the command to the process
     // running all the needed services (ie the process running `embark run`)
     if (this.isEmbarkConsole) {
@@ -197,12 +215,7 @@ class Console {
       return callback(null, output);
     }
 
-    this.events.request("runcode:eval", cmd, (err: Error, result: any) => {
-      if (err) {
-        return callback(err.message);
-      }
-      callback(null, result);
-    }, true);
+    this.events.request("runcode:eval", cmd, callback, true, logEvalCode, logEvalError);
   }
 
   private registerConsoleCommands() {

packages/embark/src/cmd/dashboard/repl.js

@@ -27,7 +27,7 @@ class REPL {
     this.events.request('console:executeCmd', cmd.trim(), function (err, message) {
       if (err) {
         // Do not return as the first param (error), because the dashboard doesn't print errors
-        return callback(null, err.red);
+        return callback(null, err.message ? err.message.red : err.red);
       }
       callback(null, message === undefined ? '' : message); // This way, we don't print undefined
     });
@@ -58,9 +58,9 @@ class REPL {
       hint = partial;
     }
 
-    this.events.request('console:executeCmd', context, (err, result)  => {
-      if (err !== null) {
-        cb(err, [[], partial]);
+    this.events.request('console:executePartial', context, (err, result)  => {
+      if (err || !result) {
+        return cb(null, [[], partial]);
       }
 
       let props = Object