Improve Vue appEntrypoint handling

.changeset/smart-cameras-kneel.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/vue': patch
+---
+
+Prevents Astro from crashing when no default function is exported from the `appEntrypoint`. Now, the entrypoint will be ignored with a warning instead.

packages/integrations/vue/src/index.ts

@@ -1,14 +1,21 @@
 import type { Options as VueOptions } from '@vitejs/plugin-vue';
-import vue from '@vitejs/plugin-vue';
 import type { Options as VueJsxOptions } from '@vitejs/plugin-vue-jsx';
-import type { AstroIntegration, AstroRenderer } from 'astro';
-import type { UserConfig } from 'vite';
+import type { AstroIntegration, AstroIntegrationLogger, AstroRenderer } from 'astro';
+import type { UserConfig, Rollup } from 'vite';
+
+import { fileURLToPath } from 'node:url';
+import vue from '@vitejs/plugin-vue';
 
 interface Options extends VueOptions {
 	jsx?: boolean | VueJsxOptions;
 	appEntrypoint?: string;
 }
 
+interface ViteOptions extends Options {
+	root: URL;
+	logger: AstroIntegrationLogger;
+}
+
 function getRenderer(): AstroRenderer {
 	return {
 		name: '@astrojs/vue',
@@ -32,7 +39,7 @@ function getJsxRenderer(): AstroRenderer {
 	};
 }
 
-function virtualAppEntrypoint(options?: Options) {
+function virtualAppEntrypoint(options: ViteOptions) {
 	const virtualModuleId = 'virtual:@astrojs/vue/app';
 	const resolvedVirtualModuleId = '\0' + virtualModuleId;
 	return {
@@ -42,18 +49,40 @@ function virtualAppEntrypoint(options?: Options) {
 				return resolvedVirtualModuleId;
 			}
 		},
-		load(id: string) {
+		async load(id: string) {
+			const noop = `export const setup = () => {}`;
 			if (id === resolvedVirtualModuleId) {
-				if (options?.appEntrypoint) {
-					return `export { default as setup } from "${options.appEntrypoint}";`;
+				if (options.appEntrypoint) {
+					try {
+						let resolved;
+						if (options.appEntrypoint.startsWith('.')) {
+							resolved = await this.resolve(fileURLToPath(new URL(options.appEntrypoint, options.root)));
+						} else {
+							resolved = await this.resolve(options.appEntrypoint, fileURLToPath(options.root));
+						}
+						if (!resolved) {
+							// This error is handled below, the message isn't shown to the user
+							throw new Error('Unable to resolve appEntrypoint');
+						}
+						const loaded = await this.load(resolved);
+						if (!loaded.hasDefaultExport) {
+							options.logger.warn(
+								`appEntrypoint \`${options.appEntrypoint}\` does not export a default function. Check out https://docs.astro.build/en/guides/integrations-guide/vue/#appentrypoint.`
+							);
+							return noop;
+						}
+						return `export { default as setup } from "${resolved.id}";`;
+					} catch {
+						options.logger.warn(`Unable to resolve appEntrypoint \`${options.appEntrypoint}\`. Does the file exist?`);
+					}
 				}
-				return `export const setup = () => {};`;
+				return noop;
 			}
-		},
-	};
+		}
+	} satisfies Rollup.Plugin;
 }
 
-async function getViteConfiguration(options?: Options): Promise<UserConfig> {
+async function getViteConfiguration(options: ViteOptions): Promise<UserConfig> {
 	const config: UserConfig = {
 		optimizeDeps: {
 			include: ['@astrojs/vue/client.js', 'vue'],
@@ -79,12 +108,14 @@ export default function (options?: Options): AstroIntegration {
 	return {
 		name: '@astrojs/vue',
 		hooks: {
-			'astro:config:setup': async ({ addRenderer, updateConfig }) => {
+			'astro:config:setup': async ({ addRenderer, updateConfig, config, logger }) => {
 				addRenderer(getRenderer());
 				if (options?.jsx) {
 					addRenderer(getJsxRenderer());
 				}
-				updateConfig({ vite: await getViteConfiguration(options) });
+				updateConfig({
+					vite: await getViteConfiguration({ ...options, root: config.root, logger }),
+				});
 			},
 		},
 	};

packages/integrations/vue/test/app-entrypoint.test.js

@@ -51,3 +51,73 @@ describe('App Entrypoint', () => {
 		expect(client).not.to.be.undefined;
 	});
 });
+
+describe('App Entrypoint no export default', () => {
+	/** @type {import('./test-utils').Fixture} */
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: './fixtures/app-entrypoint-no-export-default/',
+		});
+		await fixture.build();
+	});
+
+	it('loads during SSR', async () => {
+		const data = await fixture.readFile('/index.html');
+		const { document } = parseHTML(data);
+		const bar = document.querySelector('#foo > #bar');
+		expect(bar).not.to.be.undefined;
+		expect(bar.textContent).to.eq('works');
+	});
+
+	it('component not included in renderer bundle', async () => {
+		const data = await fixture.readFile('/index.html');
+		const { document } = parseHTML(data);
+		const island = document.querySelector('astro-island');
+		const client = island.getAttribute('renderer-url');
+		expect(client).not.to.be.undefined;
+
+		const js = await fixture.readFile(client);
+		expect(js).not.to.match(/\w+\.component\(\"Bar\"/gm);
+	});
+
+	it('loads svg components without transforming them to assets', async () => {
+		const data = await fixture.readFile('/index.html');
+		const { document } = parseHTML(data);
+		const client = document.querySelector('astro-island svg');
+
+		expect(client).not.to.be.undefined;
+	});
+});
+
+describe('App Entrypoint relative', () => {
+	/** @type {import('./test-utils').Fixture} */
+	let fixture;
+
+	before(async () => {
+		fixture = await loadFixture({
+			root: './fixtures/app-entrypoint-relative/',
+		});
+		await fixture.build();
+	});
+
+	it('loads during SSR', async () => {
+		const data = await fixture.readFile('/index.html');
+		const { document } = parseHTML(data);
+		const bar = document.querySelector('#foo > #bar');
+		expect(bar).not.to.be.undefined;
+		expect(bar.textContent).to.eq('works');
+	});
+
+	it('component not included in renderer bundle', async () => {
+		const data = await fixture.readFile('/index.html');
+		const { document } = parseHTML(data);
+		const island = document.querySelector('astro-island');
+		const client = island.getAttribute('renderer-url');
+		expect(client).not.to.be.undefined;
+
+		const js = await fixture.readFile(client);
+		expect(js).not.to.match(/\w+\.component\(\"Bar\"/gm);
+	});
+});

packages/integrations/vue/test/fixtures/app-entrypoint-no-export-default/astro.config.mjs

@@ -0,0 +1,14 @@
+import { defineConfig } from 'astro/config';
+import vue from '@astrojs/vue';
+import ViteSvgLoader from 'vite-svg-loader'
+
+export default defineConfig({
+  integrations: [vue({
+		appEntrypoint: '/src/pages/_app'
+	})],
+	vite: {
+    plugins: [
+      ViteSvgLoader(),
+    ],
+	},
+})

packages/integrations/vue/test/fixtures/app-entrypoint-no-export-default/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "@test/vue-app-entrypoint-no-export-default",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/vue": "workspace:*",
+    "astro": "workspace:*",
+    "vite-svg-loader": "4.0.0"
+  }
+}

packages/integrations/vue/test/fixtures/app-entrypoint-no-export-default/src/components/Bar.vue

@@ -0,0 +1,3 @@
+<template>
+	<div id="bar">works</div>
+</template>

packages/integrations/vue/test/fixtures/app-entrypoint-no-export-default/src/components/Foo.vue

@@ -0,0 +1,11 @@
+<script setup>
+import Bar from './Bar.vue'
+import Circle from './Circle.svg?component'
+</script>
+
+<template>
+	<div id="foo">
+		<Bar />
+		<Circle/>
+	</div>
+</template>

packages/integrations/vue/test/fixtures/app-entrypoint-no-export-default/src/pages/_app.ts

@@ -0,0 +1,3 @@
+console.log(123);
+
+// no default export

packages/integrations/vue/test/fixtures/app-entrypoint-no-export-default/src/pages/index.astro

@@ -0,0 +1,12 @@
+---
+import Foo from '../components/Foo.vue';
+---
+
+<html>
+	<head>
+		<title>Vue App Entrypoint</title>
+	</head>
+	<body>
+		<Foo client:load />
+	</body>
+</html>

packages/integrations/vue/test/fixtures/app-entrypoint-relative/astro.config.mjs

@@ -0,0 +1,8 @@
+import { defineConfig } from 'astro/config';
+import vue from '@astrojs/vue';
+
+export default defineConfig({
+  integrations: [vue({
+		appEntrypoint: './src/vue.ts'
+	})]
+})

packages/integrations/vue/test/fixtures/app-entrypoint-relative/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "@test/vue-app-entrypoint-relative",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/vue": "workspace:*",
+    "astro": "workspace:*"
+  }
+}

packages/integrations/vue/test/fixtures/app-entrypoint-relative/src/components/Bar.vue

@@ -0,0 +1,3 @@
+<template>
+	<div id="bar">works</div>
+</template>

packages/integrations/vue/test/fixtures/app-entrypoint-relative/src/components/Foo.vue

@@ -0,0 +1,11 @@
+<script setup>
+import Bar from './Bar.vue'
+import Circle from './Circle.svg?component'
+</script>
+
+<template>
+	<div id="foo">
+		<Bar />
+		<Circle/>
+	</div>
+</template>

packages/integrations/vue/test/fixtures/app-entrypoint-relative/src/pages/index.astro

@@ -0,0 +1,12 @@
+---
+import Foo from '../components/Foo.vue';
+---
+
+<html>
+	<head>
+		<title>Vue App Entrypoint</title>
+	</head>
+	<body>
+		<Foo client:load />
+	</body>
+</html>

packages/integrations/vue/test/fixtures/app-entrypoint-relative/src/vue.ts

@@ -0,0 +1 @@
+export default () => {}