Refactor build pipeline to esbuild and tsx test runner

package.json

@@ -9,9 +9,8 @@
     "test": "test"
   },
   "scripts": {
-    "test": "yarn build:test && FASTIFY_AUTOLOAD_TYPESCRIPT=1 node --test --experimental-test-coverage 'dist/test/**/*.js'",
-    "build": "tsc",
-    "build:test": "yarn build && node scripts/copy-test-assets.js && tsc -p test/tsconfig.json",
+    "test": "FASTIFY_AUTOLOAD_TYPESCRIPT=1 tsx --test --experimental-test-coverage test/**/*.test.ts",
+    "build": "node scripts/build.js",
     "watch": "tsc -w",
     "start": "fastify start -l info dist/src/app.js --options",
     "dev": "yarn run build && concurrently -k -p '[{name}]' -n TypeScript,App -c yellow.bold,cyan.bold yarn:watch yarn:dev:start",
@@ -52,6 +51,7 @@
     "@types/jsonwebtoken": "^9.0.10",
     "@types/node": "^24.10.1",
     "concurrently": "^9.2.1",
+    "esbuild": "^0.27.3",
     "eslint": "^9.39.1",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-prettier": "^5.5.4",
@@ -60,6 +60,7 @@
     "husky": "^9.1.7",
     "prettier": "^3.7.4",
     "prettier-plugin-jsdoc": "^1.7.0",
+    "tsx": "^4.21.0",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.48.1"
   },

scripts/build.js

@@ -0,0 +1,28 @@
+import { build } from "esbuild";
+import { copyFile, glob, rm } from "node:fs/promises";
+import path from "node:path";
+
+const distDir = path.resolve("dist");
+
+try {
+  await rm(distDir, { recursive: true, force: true });
+
+  const entryPoints = [];
+  for await (const file of glob("src/**/*.ts")) {
+    entryPoints.push(file);
+  }
+
+  await build({
+    entryPoints,
+    outdir: distDir,
+    outbase: ".",
+    platform: "node",
+    format: "esm",
+    sourcemap: true,
+  });
+
+  await copyFile("package.json", path.join(distDir, "package.json"));
+} catch (error) {
+  console.error(error);
+  process.exitCode = 1;
+}

test/helper.ts

@@ -1,18 +1,12 @@
 // This file contains code that we reuse between our tests.
-import { AppOptions } from "../src/app.js";
-import helper from "fastify-cli/helper.js";
+import app, { AppOptions, options } from "../src/app.js";
+import Fastify from "fastify";
 import * as test from "node:test";
-import * as path from "path";
-import { fileURLToPath } from "url";
 
 export type TestContext = {
   after: typeof test.after;
 };
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = path.dirname(__filename);
-const AppPath = path.join(__dirname, "..", "src", "app.js");
-
 // Fill in this config with all the configurations
 // needed for testing the application
 async function config(): Promise<AppOptions> {
@@ -26,18 +20,17 @@ async function config(): Promise<AppOptions> {
 
 // Automatically build and tear down our instance
 async function build(t: TestContext) {
-  // you can set all the options supported by the fastify CLI command
-  const argv = [AppPath];
-
-  // fastify-plugin ensures that all decorators
-  // are exposed for testing purposes, this is
-  // different from the production setup
-  const app = await helper.build(argv, await config(), await config());
+  const fastify = Fastify({ pluginTimeout: options.pluginTimeout });
+  const appConfig = await config();
+  await fastify.register(app, appConfig);
+  await fastify.ready();
 
   // Tear down our app after we are done
-  t.after(() => void app.close());
+  t.after(async () => {
+    await fastify.close();
+  });
 
-  return app;
+  return fastify;
 }
 
 export { config, build };