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import type { AstroAdapter, AstroConfig, AstroIntegration, RouteData } from 'astro';
import glob from 'fast-glob';
import { basename } from 'node:path';
import { fileURLToPath } from 'node:url';
import { pathToFileURL } from 'node:url';
import {
defaultImageConfig,
getImageConfig,
throwIfAssetsNotEnabled,
type VercelImageConfig,
} from '../image/shared.js';
import { exposeEnv } from '../lib/env.js';
import { getVercelOutput, removeDir, writeJson } from '../lib/fs.js';
import { copyDependenciesToFunction } from '../lib/nft.js';
import { getRedirects } from '../lib/redirects.js';
import { generateEdgeMiddleware } from './middleware.js';
const PACKAGE_NAME = '@astrojs/vercel/serverless';
export const ASTRO_LOCALS_HEADER = 'x-astro-locals';
export const VERCEL_EDGE_MIDDLEWARE_FILE = 'vercel-edge-middleware';
function getAdapter(): AstroAdapter {
return {
name: PACKAGE_NAME,
serverEntrypoint: `${PACKAGE_NAME}/entrypoint`,
exports: ['default'],
};
}
export interface VercelServerlessConfig {
includeFiles?: string[];
excludeFiles?: string[];
analytics?: boolean;
imageService?: boolean;
imagesConfig?: VercelImageConfig;
}
export default function vercelServerless({
includeFiles,
excludeFiles,
analytics,
imageService,
imagesConfig,
}: VercelServerlessConfig = {}): AstroIntegration {
let _config: AstroConfig;
let buildTempFolder: URL;
let serverEntry: string;
let _entryPoints: Map<RouteData, URL>;
// Extra files to be merged with `includeFiles` during build
const extraFilesToInclude: URL[] = [];
async function createFunctionFolder(funcName: string, entry: URL, inc: URL[]) {
const functionFolder = new URL(`./functions/${funcName}.func/`, _config.outDir);
// Copy necessary files (e.g. node_modules/)
const { handler } = await copyDependenciesToFunction({
entry,
outDir: functionFolder,
includeFiles: inc,
excludeFiles: excludeFiles?.map((file) => new URL(file, _config.root)) || [],
});
// Enable ESM
// https://aws.amazon.com/blogs/compute/using-node-js-es-modules-and-top-level-await-in-aws-lambda/
await writeJson(new URL(`./package.json`, functionFolder), {
type: 'module',
});
// Serverless function config
// https://vercel.com/docs/build-output-api/v3#vercel-primitives/serverless-functions/configuration
await writeJson(new URL(`./.vc-config.json`, functionFolder), {
runtime: getRuntime(),
handler,
launcherType: 'Nodejs',
});
}
return {
name: PACKAGE_NAME,
hooks: {
'astro:config:setup': ({ command, config, updateConfig, injectScript }) => {
if (command === 'build' && analytics) {
injectScript('page', 'import "@astrojs/vercel/analytics"');
}
const outDir = getVercelOutput(config.root);
const viteDefine = exposeEnv(['VERCEL_ANALYTICS_ID']);
updateConfig({
outDir,
build: {
serverEntry: 'entry.mjs',
client: new URL('./static/', outDir),
server: new URL('./dist/', config.root),
},
vite: {
define: viteDefine,
ssr: {
external: ['@vercel/nft'],
},
},
...getImageConfig(imageService, imagesConfig, command),
});
},
'astro:config:done': ({ setAdapter, config }) => {
throwIfAssetsNotEnabled(config, imageService);
setAdapter(getAdapter());
_config = config;
buildTempFolder = config.build.server;
serverEntry = config.build.serverEntry;
if (config.output === 'static') {
throw new Error(`
[@astrojs/vercel] \`output: "server"\` or \`output: "hybrid"\` is required to use the serverless adapter.
`);
}
},
'astro:build:ssr': async ({ entryPoints, middlewareEntryPoint }) => {
_entryPoints = entryPoints;
if (middlewareEntryPoint) {
const outPath = fileURLToPath(buildTempFolder);
const vercelEdgeMiddlewareHandlerPath = new URL(
VERCEL_EDGE_MIDDLEWARE_FILE,
_config.srcDir
);
const bundledMiddlewarePath = await generateEdgeMiddleware(
middlewareEntryPoint,
outPath,
vercelEdgeMiddlewareHandlerPath
);
// let's tell the adapter that we need to save this file
extraFilesToInclude.push(bundledMiddlewarePath);
}
},
'astro:build:done': async ({ routes }) => {
// Merge any includes from `vite.assetsInclude
if (_config.vite.assetsInclude) {
const mergeGlobbedIncludes = (globPattern: unknown) => {
if (typeof globPattern === 'string') {
const entries = glob.sync(globPattern).map((p) => pathToFileURL(p));
extraFilesToInclude.push(...entries);
} else if (Array.isArray(globPattern)) {
for (const pattern of globPattern) {
mergeGlobbedIncludes(pattern);
}
}
};
mergeGlobbedIncludes(_config.vite.assetsInclude);
}
const routeDefinitions: { src: string; dest: string }[] = [];
const filesToInclude = includeFiles?.map((file) => new URL(file, _config.root)) || [];
filesToInclude.push(...extraFilesToInclude);
// Multiple entrypoint support
if (_entryPoints.size) {
for (const [route, entryFile] of _entryPoints) {
const func = basename(entryFile.toString()).replace(/\.mjs$/, '');
await createFunctionFolder(func, entryFile, filesToInclude);
routeDefinitions.push({
src: route.pattern.source,
dest: func,
});
}
} else {
await createFunctionFolder(
'render',
new URL(serverEntry, buildTempFolder),
filesToInclude
);
routeDefinitions.push({ src: '/.*', dest: 'render' });
}
// Output configuration
// https://vercel.com/docs/build-output-api/v3#build-output-configuration
await writeJson(new URL(`./config.json`, _config.outDir), {
version: 3,
routes: [...getRedirects(routes, _config), { handle: 'filesystem' }, ...routeDefinitions],
...(imageService || imagesConfig
? { images: imagesConfig ? imagesConfig : defaultImageConfig }
: {}),
});
// Remove temporary folder
await removeDir(buildTempFolder);
},
},
};
}
function getRuntime() {
const version = process.version.slice(1); // 'v16.5.0' --> '16.5.0'
const major = version.split('.')[0]; // '16.5.0' --> '16'
return `nodejs${major}.x`;
}
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