buildServerlessFolder() — astro Function Reference

Source Code

packages/integrations/vercel/src/index.ts lines 658–693

	async buildServerlessFolder(entry: URL, functionName: string, root: URL) {
		const { includeFiles, excludeFiles, logger, NTF_CACHE, runtime, maxDuration } = this;
		// .vercel/output/functions/<name>.func/
		const functionFolder = new URL(`./functions/${functionName}.func/`, this.outDir);
		const packageJson = new URL(`./functions/${functionName}.func/package.json`, this.outDir);
		const vcConfig = new URL(`./functions/${functionName}.func/.vc-config.json`, this.outDir);

		// Copy necessary files (e.g. node_modules/)
		const { handler } = await copyDependenciesToFunction(
			{
				entry,
				outDir: functionFolder,
				includeFiles,
				excludeFiles,
				logger,
				root,
			},
			NTF_CACHE,
		);

		// Enable ESM
		// https://aws.amazon.com/blogs/compute/using-node-js-es-modules-and-top-level-await-in-aws-lambda/
		await writeJson(packageJson, {
			type: 'module',
		});

		// Serverless function config
		// https://vercel.com/docs/build-output-api/v3#vercel-primitives/serverless-functions/configuration
		await writeJson(vcConfig, {
			runtime,
			handler: handler.replaceAll('\\', '/'),
			launcherType: 'Nodejs',
			maxDuration,
			supportsResponseStreaming: true,
		});
	}