Print user friendly error if no entrypoint can be found

src/Bundler.js

@@ -142,7 +142,9 @@ class Bundler extends EventEmitter {
       contentHash:
         typeof options.contentHash === 'boolean'
           ? options.contentHash
-          : isProduction
+          : isProduction,
+      throwErrors:
+        typeof options.throwErrors === 'boolean' ? options.throwErrors : true
     };
   }
 
@@ -223,6 +225,7 @@ class Bundler extends EventEmitter {
 
     let isInitialBundle = !this.entryAssets;
     let startTime = Date.now();
+    let initialised = !isInitialBundle;
     this.pending = true;
     this.error = null;
 
@@ -242,10 +245,24 @@ class Bundler extends EventEmitter {
 
         this.entryAssets = new Set();
         for (let entry of this.entryFiles) {
-          let asset = await this.resolveAsset(entry);
-          this.buildQueue.add(asset);
-          this.entryAssets.add(asset);
+          try {
+            let asset = await this.resolveAsset(entry);
+            this.buildQueue.add(asset);
+            this.entryAssets.add(asset);
+          } catch (err) {
+            throw new Error(
+              `Cannot resolve entry "${entry}" from "${
+                this.options.rootDir
+              }"`
+            );
+          }
+        }
+
+        if (this.entryAssets.size === 0) {
+          throw new Error('No entries found.');
         }
+
+        initialised = true;
       }
 
       // Build the queued assets.
@@ -318,10 +335,11 @@ class Bundler extends EventEmitter {
         this.hmr.emitError(err);
       }
 
-      if (process.env.NODE_ENV === 'production') {
-        process.exitCode = 1;
-      } else if (process.env.NODE_ENV === 'test' && !this.hmr) {
+      if (this.options.throwErrors && !this.hmr) {
         throw err;
+      } else if (process.env.NODE_ENV === 'production' || !initialised) {
+        await this.stop();
+        process.exit(1);
       }
     } finally {
       this.pending = false;

src/cli.js

@@ -202,6 +202,7 @@ async function bundle(main, command) {
     };
   }
 
+  command.throwErrors = false;
   command.scopeHoist = command.experimentalScopeHoisting || false;
   const bundler = new Bundler(main, command);
 

test/utils.js

@@ -37,7 +37,8 @@ function bundler(file, opts) {
         cache: false,
         killWorkers: false,
         hmr: false,
-        logLevel: 0
+        logLevel: 0,
+        throwErrors: true
       },
       opts
     )