From b565c38f4895354b6334f9ea042c95d9503e5dac Mon Sep 17 00:00:00 2001
From: mrazauskas <72159681+mrazauskas@users.noreply.github.com>
Date: Thu, 12 Aug 2021 11:49:25 +0300
Subject: [PATCH] fix(generator): throw an error when Builder is missing
 (#9663)

---
 packages/generator/src/generator.js            | 6 ++++++
 packages/generator/test/generator.init.test.js | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/packages/generator/src/generator.js b/packages/generator/src/generator.js
index 7147e7713b..caf459f124 100644
--- a/packages/generator/src/generator.js
+++ b/packages/generator/src/generator.js
@@ -84,6 +84,12 @@ export default class Generator {
     await this.nuxt.callHook('export:before', this)
 
     if (build) {
+      if (!this.builder) {
+        throw new Error(
+          `Could not generate. Make sure a Builder instance is passed to the constructor of Generator class or `getGenerator` function \
+or disable the build step: \`generate({ build: false })\``)
+      }
+
       // Add flag to set process.static
       this.builder.forGenerate()
 
diff --git a/packages/generator/test/generator.init.test.js b/packages/generator/test/generator.init.test.js
index e2c977f616..8768633f6e 100644
--- a/packages/generator/test/generator.init.test.js
+++ b/packages/generator/test/generator.init.test.js
@@ -98,6 +98,13 @@ describe('generator: initialize', () => {
     expect(generator.initDist).not.toBeCalled()
   })
 
+  test('should throw error when build is not disabled, but Builder instance is omitted', async () => {
+    const nuxt = createNuxt()
+    const generator = new Generator(nuxt)
+
+    await expect(generator.initiate()).rejects.toThrow('Could not generate')
+  })
+
   test('should init routes with generate.routes and routes.json', async () => {
     const nuxt = createNuxt()
     nuxt.options = {