feat(netlify): support included/excluded files

.changeset/itchy-donuts-love.md

@@ -0,0 +1,23 @@
+---
+'@astrojs/netlify': minor
+---
+
+Adds "includedFiles" and "excludedFiles" options. These allow extra files to be deployed in the SSR function bundle.
+
+When an Astro site using `server` or `hybrid` rendering is deployed to Netlify, the generated functions trace the server dependencies and include any that may be needed in SSR. However sometimes you may want to include extra files that are not detected as dependencies, such as files that are loaded using `fs` functions. Also, you may sometimes want to specifically exclude dependencies that are bundled automatically. For example, you may have a Node module that includes a large binary.
+
+The `includedFiles` and `excludedFiles` options allow you specify these inclusions and exclusions as an array of file paths relative to the project root. Both options support glob patterns, so you can include/exclude multiple files at once.
+
+The paths are relative to the site root. If you are loading them using filesystem functions, make sure you resolve paths relative to the site root, and not relative to the source file. At runtime the compiled file will be in a different location, so paths that are relative to the file will not work. You should instead resolve the path using `path.resolve()` or `process.cwd()`, which will give you the site root.
+
+```js
+import netlify from '@astrojs/netlify';
+import { defineConfig } from 'astro/config';
+
+export default defineConfig({
+  output: 'server',
+  adapter: netlify({
+    includedFiles: ['src/address-data/**/*.csv', 'src/include-this.txt'],
+    excludedFiles: ['node_modules/chonky-module/not-this-massive-file.mp4'],
+  })
+});

packages/netlify/package.json

@@ -25,6 +25,7 @@
   "files": ["dist"],
   "scripts": {
     "build": "tsc",
+    "dev": "tsc --watch",
     "test-fn": "astro-scripts test \"test/functions/*.test.js\"",
     "test-static": "astro-scripts test \"test/static/*.test.js\"",
     "test": "pnpm run test-fn && pnpm run test-static",
@@ -45,7 +46,7 @@
     "@netlify/edge-functions": "^2.8.1",
     "@netlify/edge-handler-types": "^0.34.1",
     "@types/node": "^20.14.10",
-    "astro": "^4.11.3",
+    "astro": "^4.11.5",
     "astro-scripts": "workspace:*",
     "cheerio": "1.0.0-rc.12",
     "execa": "^8.0.1",

packages/netlify/src/index.ts

@@ -1,15 +1,15 @@
 import { randomUUID } from 'node:crypto';
 import { appendFile, mkdir, readFile, rm, writeFile } from 'node:fs/promises';
 import type { IncomingMessage } from 'node:http';
-import { fileURLToPath } from 'node:url';
+import { fileURLToPath, pathToFileURL } from 'node:url';
 import { emptyDir } from '@astrojs/internal-helpers/fs';
 import { createRedirectsFromAstroRoutes } from '@astrojs/underscore-redirects';
 import type { Context } from '@netlify/functions';
 import type { AstroConfig, AstroIntegration, AstroIntegrationLogger, RouteData } from 'astro';
 import { build } from 'esbuild';
+import glob from 'fast-glob';
 import { copyDependenciesToFunction } from './lib/nft.js';
 import type { Args } from './ssr-function.js';
-
 const { version: packageVersion } = JSON.parse(
 	await readFile(new URL('../package.json', import.meta.url), 'utf8')
 );
@@ -185,6 +185,18 @@ export interface NetlifyIntegrationConfig {
 	 * @default {true}
 	 */
 	imageCDN?: boolean;
+
+	/**
+	 * Extra files to include in the SSR function bundle. Paths are relative to the project root.
+	 * Glob patterns are supported.
+	 */
+	includedFiles?: string[];
+
+	/**
+	 * Files to exclude from the SSR function bundle. Paths are relative to the project root.
+	 * Glob patterns are supported.
+	 */
+	excludedFiles?: string[];
 }
 
 export default function netlifyIntegration(
@@ -237,18 +249,37 @@ export default function netlifyIntegration(
 		}
 	}
 
+	async function getFilesByGlob(
+		include: Array<string> = [],
+		exclude: Array<string> = []
+	): Promise<Array<URL>> {
+		const files = await glob(include, {
+			cwd: fileURLToPath(rootDir),
+			absolute: true,
+			ignore: exclude,
+		});
+		return files.map((file) => pathToFileURL(file));
+	}
+
 	async function writeSSRFunction({
 		notFoundContent,
 		logger,
 	}: { notFoundContent?: string; logger: AstroIntegrationLogger }) {
 		const entry = new URL('./entry.mjs', ssrBuildDir());
 
+		const includedFiles = await getFilesByGlob(
+			integrationConfig?.includedFiles,
+			integrationConfig?.excludedFiles
+		);
+
+		const excludedFiles = await getFilesByGlob(integrationConfig?.excludedFiles);
+
 		const { handler } = await copyDependenciesToFunction(
 			{
 				entry,
 				outDir: ssrOutputDir(),
-				includeFiles: [],
-				excludeFiles: [],
+				includeFiles: includedFiles,
+				excludeFiles: excludedFiles,
 				logger,
 			},
 			TRACE_CACHE

packages/netlify/src/ssr-function.ts

@@ -1,3 +1,4 @@
+import { fileURLToPath } from 'node:url';
 import type { Context } from '@netlify/functions';
 import type { SSRManifest } from 'astro';
 import { App } from 'astro/app';
@@ -24,7 +25,13 @@ export const createExports = (manifest: SSRManifest, { middlewareSecret }: Args)
 		cacheOnDemandPages: boolean;
 		notFoundContent?: string;
 	}) {
+		// The entrypoint is created in `.netlify/v1/build` so we need to go up two levels to get to the root
+		const root = fileURLToPath(new URL('../../', import.meta.url));
 		return async function handler(request: Request, context: Context) {
+			// This entrypoint will be deep inside the directory structure below cwd
+			// We chdir to the root so that we can resolve the correct paths at runtime
+			process.chdir(root);
+
 			const routeData = app.match(request);
 			if (!routeData && typeof integrationConfig.notFoundContent !== 'undefined') {
 				return new Response(integrationConfig.notFoundContent, {

packages/netlify/test/functions/fixtures/includes/astro.config.mjs

@@ -0,0 +1,11 @@
+import netlify from '@astrojs/netlify';
+import { defineConfig } from 'astro/config';
+
+export default defineConfig({
+  output: 'server',
+  adapter: netlify({
+    includedFiles: ['files/**/*.csv', 'files/include-this.txt'],
+    excludedFiles: ['files/subdirectory/not-this.csv'],
+  }),
+  site: `http://example.com`,
+});

packages/netlify/test/functions/fixtures/includes/files/also-this.csv

@@ -0,0 +1 @@
+1,2,3

packages/netlify/test/functions/fixtures/includes/files/include-this.txt

@@ -0,0 +1 @@
+hello

packages/netlify/test/functions/fixtures/includes/files/subdirectory/and-this.csv

@@ -0,0 +1 @@
+1,2,3

packages/netlify/test/functions/fixtures/includes/files/subdirectory/not-this.csv

@@ -0,0 +1 @@
+1,2,3

packages/netlify/test/functions/fixtures/includes/files/subdirectory/or-this.txt

@@ -0,0 +1 @@
+hello

packages/netlify/test/functions/fixtures/includes/package.json

@@ -0,0 +1,13 @@
+{
+  "name": "@test/netlify-includes",
+  "version": "0.0.0",
+  "private": true,
+  "dependencies": {
+    "@astrojs/netlify": "workspace:",
+    "astro": "^4.11.5"
+  },
+  "scripts": {
+    "build": "astro build",
+    "dev": "astro dev"
+  }
+}

packages/netlify/test/functions/fixtures/includes/src/env.d.ts

@@ -0,0 +1 @@
+/// <reference types="astro/client" />

packages/netlify/test/functions/fixtures/includes/src/pages/404.astro

@@ -0,0 +1,7 @@
+---
+export const prerender = false
+const header = Astro.request.headers.get("x-test")
+---
+
+<p>This is my custom 404 page</p>
+<p>x-test: {header}</p>

packages/netlify/test/functions/fixtures/includes/src/pages/index.astro

@@ -0,0 +1,12 @@
+---
+import { promises as fs } from 'fs';
+const cwd = process.cwd();
+const file = await fs.readFile('files/include-this.txt', 'utf-8');
+---
+<html>
+<head><title>Testing</title></head>
+<body>
+	<h1>{file}</h1>
+	<p>{cwd}</p>
+</body>
+</html>

packages/netlify/test/functions/includes.test.js

@@ -0,0 +1,54 @@
+import * as assert from 'node:assert/strict';
+import { existsSync } from 'node:fs';
+import { before, describe, it } from 'node:test';
+import { fileURLToPath } from 'node:url';
+import { loadFixture } from '@astrojs/test-utils';
+import * as cheerio from 'cheerio';
+
+describe(
+	'Included files',
+	() => {
+		let fixture;
+		const root = new URL('./fixtures/includes/', import.meta.url);
+		const expectedCwd = new URL(
+			'.netlify/v1/functions/ssr/packages/netlify/test/functions/fixtures/includes/',
+			root
+		);
+
+		before(async () => {
+			fixture = await loadFixture({ root });
+			await fixture.build();
+		});
+
+		it('Includes files', async () => {
+			const filesRoot = new URL('./files/', expectedCwd);
+			const expectedFiles = ['include-this.txt', 'also-this.csv', 'subdirectory/and-this.csv'];
+
+			for (const file of expectedFiles) {
+				assert.ok(existsSync(new URL(file, filesRoot)), `Expected file ${file} to exist`);
+			}
+
+			const notExpectedFiles = ['subdirectory/not-this.csv', 'subdirectory/or-this.txt'];
+
+			for (const file of notExpectedFiles) {
+				assert.ok(!existsSync(new URL(file, filesRoot)), `Expected file ${file} to not exist`);
+			}
+		});
+
+		it('Can load included files correctly', async () => {
+			const entryURL = new URL(
+				'./fixtures/includes/.netlify/v1/functions/ssr/ssr.mjs',
+				import.meta.url
+			);
+			const { default: handler } = await import(entryURL);
+			const resp = await handler(new Request('http://example.com/'), {});
+			const html = await resp.text();
+			const $ = cheerio.load(html);
+			assert.equal($('h1').text(), 'hello');
+			assert.equal($('p').text(), fileURLToPath(expectedCwd).slice(0, -1));
+		});
+	},
+	{
+		timeout: 120000,
+	}
+);