[next] Add @vercel/next Builder (#7793)

packages/next/scripts/build-edge-function-template.js

@@ -0,0 +1,46 @@
+const { build } = require('esbuild');
+const assert = require('assert');
+const { outputFile } = require('fs-extra');
+
+/**
+ * @param {Pick<import('esbuild').BuildOptions, 'outfile' | 'format' | 'entryPoints' | 'write'>} options
+ */
+async function buildTemplate(options) {
+  return build({
+    bundle: true,
+    entryPoints: options.entryPoints,
+    format: options.format,
+    legalComments: 'none',
+    minify: process.env.NODE_ENV !== 'test',
+    outfile: options.outfile,
+    // Cloudflare Workers uses the V8 JavaScript engine from Google Chrome.
+    // The Workers runtime is updated at least once a week, to at least the version
+    // that is currently used by Chrome's stable release.
+    // To see the latest stable chrome version: https://www.chromestatus.com/features/schedule
+    target: 'esnext',
+    write: options.write,
+  });
+}
+
+async function buildNextjsWrapper() {
+  const { outputFiles } = await buildTemplate({
+    entryPoints: ['./src/edge-function-source/get-edge-function'],
+    outfile: 'dist/___get-nextjs-edge-function.js',
+    format: 'cjs', // https://esbuild.github.io/api/#format
+    write: false,
+  });
+
+  assert(outputFiles);
+  const [src] = outputFiles;
+
+  return outputFile(src.path, `module.exports = ${JSON.stringify(src.text)}`);
+}
+
+module.exports = buildNextjsWrapper;
+
+if (!module.parent) {
+  buildNextjsWrapper().catch(err => {
+    console.error(err);
+    process.exit(1);
+  });
+}