typescript-node: Declare the typescript-node toolchain in .tool-versions

typescript-node/.tool-versions

@@ -0,0 +1,2 @@
+node 22
+yarn 3

typescript-node/README.md

@@ -1,16 +1,30 @@
 # TypeScript
 
-Skeleton project for TypeScript (via NodeJS) with Jest for testing.
+Skeleton project for TypeScript (via NodeJS).
 
-## Usage
-- `./script/setup` to install dependencies
-- `./script/test` to run the tests
+## Prerequisites
+
+The toolchain this project needs is declared in [`.tool-versions`](./.tool-versions):
+
+```
+node 22
+yarn 3
+```
 
-### Other commands
-- `yarn watch` will constantly compile `index.ts` then execute the compiled version on every file change (for quick development feedback loop) using [tsc-watch](https://www.npmjs.com/package/tsc-watch) under the hood.
+Install those however you prefer, as long as they end up on your `PATH`. The quickest route is
+[mise](https://mise.jdx.dev/), which reads the file for you:
+
+```sh
+mise install
+```
+
+## Usage
+- `./script/setup` to fetch dependencies
+- `./script/test` to run the tests, or `./script/test --watch` to re-run them on every change
+- `./script/start` to run the app (watches for changes and recompiles automatically)
 
 ## Structure
 - Code located in [`index.ts`](./src/index.ts)
 - Tests located in [`index.test.ts`](./src/index.test.ts)
 
-However, you're free to organise your code as you like. 
+However, you're free to organise your code as you like.

typescript-node/package.json

@@ -8,7 +8,8 @@
   "scripts": {
     "test": "jest",
     "tsc": "tsc",
-    "watch": "tsc-watch --onSuccess 'node ./dist/index.js' --onFailure 'echo Beep! Compilation Failed' --compiler typescript/bin/tsc"
+    "watch": "tsc-watch --onSuccess 'node ./dist/index.js' --onFailure 'echo Beep! Compilation Failed' --compiler typescript/bin/tsc",
+    "start": "tsc && node ./dist/index.js"
   },
   "devDependencies": {
     "@guardian/tsconfig": "0.2.0",

typescript-node/script/setup

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
-set -e
+set -euo pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
 
 yarn

typescript-node/script/start

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")/.."
+
+if [[ "${1:-}" == "--watch" ]]; then
+  yarn watch
+else
+  yarn start
+fi