Adding IPC channel without watch made the proccess hang

Author: PanayotCankov

lib/compiler.js

@@ -8,11 +8,6 @@ let hasBeenInvoked = false;
 
 let webpackProcess = null;
 
-function throwError(error) {
-    console.error(error.message);
-    process.exit(error.code || 1);
-}
-
 exports.getWebpackProcess = function getWebpackProcess() {
     return webpackProcess;
 }
@@ -23,13 +18,15 @@ exports.runWebpackCompiler = function runWebpackCompiler(config, $mobileHelper,
             let isResolved = false;
             function resolve() {
                 if (isResolved) return;
+                isResolved = true;
                 if (childProcess) {
                     childProcess.removeListener("message", resolveOnWebpackCompilationComplete);
                 }
                 resolveBase();
             }
             function reject() {
                 if (isResolved) return;
+                isResolved = true;
                 if (childProcess) {
                     childProcess.removeListener("message", resolveOnWebpackCompilationComplete);
                 }
@@ -69,10 +66,10 @@ exports.runWebpackCompiler = function runWebpackCompiler(config, $mobileHelper,
             ].filter(a => !!a);
 
             const childProcess = spawn("node", args, {
-                // IPC calls so we don't mess with the stdin/out/err.
+                // Watch opens IPC so we don't mess with the stdin/out/err.
                 // These will notify us for the webpack compilation states.
                 // Enables `childProcess.on("message", msg => ...)` kind of communication.
-                stdio: ["inherit", "inherit", "inherit", "ipc"],
+                stdio: config.watch ? ["inherit", "inherit", "inherit", "ipc"] : "inherit",
                 pwd: $projectData.projectDir,
                 shell: true,
             });

plugins/WatchStateLoggerPlugin.ts

@@ -7,13 +7,13 @@ export class WatchStateLoggerPlugin {
     apply(compiler) {
         compiler.plugin("watch-run", function(compiler, callback) {
             console.log("File change detected. Starting incremental webpack compilation...");
-            process.send("File change detected. Starting incremental webpack compilation...", error => null);
+            process.send && process.send("File change detected. Starting incremental webpack compilation...", error => null);
             callback();
         });
         compiler.plugin("after-emit", function(compilation, callback) {
             callback();
             console.log("Webpack compilation complete. Watching for file changes.");
-            process.send("Webpack compilation complete. Watching for file changes.", error => null);
+            process.send && process.send("Webpack compilation complete. Watching for file changes.", error => null);
         });
     }
 }