make local build callable (#402)

* Move adapterBuild to index.ts

* update package version

Author: annajowang

packages/@apphosting/build/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@apphosting/build",
-    "version": "0.1.2",
+    "version": "0.1.3",
     "main": "dist/index.js",
     "description": "Experimental addon to the Firebase CLI to add web framework support",
     "repository": {

packages/@apphosting/build/src/adapter-builds.ts

@@ -1,6 +1,6 @@
 #! /usr/bin/env node
 import { SupportedFrameworks } from "@apphosting/common";
-import { adapterBuild } from "../adapter-builds.js";
+import { adapterBuild } from "../index.js";
 import { program } from "commander";
 
 program

packages/@apphosting/build/src/bin/localbuild.ts

@@ -1 +1,33 @@
-export {};
+import promiseSpawn from "@npmcli/promise-spawn";
+import { yellow, bgRed, bold } from "colorette";
+
+export async function adapterBuild(projectRoot: string, framework: string) {
+  // TODO(#382): We are using the latest framework adapter versions, but in the future
+  // we should parse the framework version and use the matching adapter version.
+  const adapterName = `@apphosting/adapter-${framework}`;
+  const packumentResponse = await fetch(`https://registry.npmjs.org/${adapterName}`);
+  if (!packumentResponse.ok)
+    throw new Error(
+      `Failed to fetch ${adapterName}: ${packumentResponse.status} ${packumentResponse.statusText}`,
+    );
+  let packument;
+  try {
+    packument = await packumentResponse.json();
+  } catch (e) {
+    throw new Error(`Failed to parse response from NPM registry for ${adapterName}.`);
+  }
+  const adapterVersion = packument?.["dist-tags"]?.["latest"];
+  if (!adapterVersion) {
+    throw new Error(`Could not find 'latest' dist-tag for ${adapterName}`);
+  }
+  // TODO(#382): should check for existence of adapter in app's package.json and use that version instead.
+
+  console.log(" 🔥", bgRed(` ${adapterName}@${yellow(bold(adapterVersion))} `), "\n");
+
+  const buildCommand = `apphosting-adapter-${framework}-build`;
+  await promiseSpawn("npx", ["-y", "-p", `${adapterName}@${adapterVersion}`, buildCommand], {
+    cwd: projectRoot,
+    shell: true,
+    stdio: "inherit",
+  });
+}