init repo

.gitignore

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+node_modules
+dist

.prettierignore

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+node_modules
+dist

.vscode/settings.json

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+{
+    "editor.formatOnSave": true,
+    "editor.defaultFormatter": "esbenp.prettier-vscode"
+}

README.md

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+# fastify-ts-template
+
+A template for fasitify with TypeScript, eslint and prettier built with esbuild.
+
+## Using this template
+
+`git clone` this repo, then delete the `.git` directory and initalize it again, and change `name` and `author` in `package.json`.
+
+## License
+
+The template itself is `GPL-3.0-only`, and it is a default recommended license for all projects created with this template, but projects are free to choose any other license.

eslint.config.js

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+// @ts-check
+
+import tse from 'typescript-eslint';
+
+export default tse.config(...tse.configs.recommended, {
+    rules: {
+        'no-unused-vars': [
+            'error',
+            {
+                argsIgnorePattern: '_',
+                args: 'after-used',
+                caughtErrors: 'none',
+            },
+        ],
+        'no-invalid-regexp': 'error',
+        'no-var': 'error',
+        eqeqeq: 'error',
+        'no-useless-concat': 'error',
+        'no-useless-rename': 'error',
+        'no-useless-assignment': 'error',
+        'default-case': 'error',
+        'prefer-const': 'error',
+    },
+});

package.json

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+{
+  "name": "fastify-ts-template",
+  "license": "GPL-3.0-only",
+  "author": "blek! <me@blek.codes>",
+  "type": "module",
+  "main": "dist/index.js",
+  "dependencies": {
+    "fastify": "^4.27.0",
+    "typescript-eslint": "^7.8.0"
+  },
+  "devDependencies": {
+    "@types/eslint": "^8.56.10",
+    "@types/node": "^20.12.11",
+    "esbuild": "^0.21.1",
+    "eslint": "^9.2.0",
+    "prettier": "3.2.5",
+    "typescript": "^5.4.5"
+  },
+  "scripts": {
+    "build": "node scripts/build.js",
+    "lint": "eslint",
+    "format": "prettier"
+  }
+}

prettier.config.js

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+
+/**
+ * @type { import("prettier").Config }
+ */
+export default {
+    trailingComma: 'all',
+    tabWidth: 4,
+    semi: true,
+    singleQuote: true,
+    endOfLine: 'lf'
+}

scripts/build.js

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+import esbuild from 'esbuild';
+import fs from 'node:fs';
+
+const entryPoints = fs
+    .readdirSync('src', { recursive: true })
+    .filter((x) => x.endsWith('.ts'))
+    .map((x) => 'src/' + x);
+
+if (fs.existsSync('dist')) fs.rmSync('dist', { recursive: true, force: true });
+
+try {
+    fs.mkdirSync('dist');
+} catch (_) {}
+
+await esbuild.build({
+    entryPoints,
+    outdir: 'dist',
+});

src/index.ts

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+import Fastify from 'fastify';
+import routes from './routes/index.js';
+
+const fastify = Fastify();
+
+// register any plugins here, i.e.
+// fastify.register(middie);
+
+fastify.register(routes);
+
+fastify.listen({
+    port: parseInt(process.env.PORT ?? '80'),
+    host: process.env.HOST ?? 'localhost',
+});

src/routes/index.ts

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+import { FastifyPluginAsync } from 'fastify';
+import ping from './ping.js';
+
+export default (async function (fastify) {
+    await fastify.register(ping);
+} as FastifyPluginAsync);

src/routes/ping.ts

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+import { FastifyPluginAsync } from 'fastify';
+
+export default (async function (fastify) {
+    fastify.get('/ping', async () => {
+        return 'Pong!';
+    });
+} as FastifyPluginAsync);