Set up ts-node project

.eslintrc.js

@@ -0,0 +1,13 @@
+module.exports = {
+    root: true,
+    env: {
+        node: true,
+    },
+    parser: '@typescript-eslint/parser',
+    plugins: ['@typescript-eslint'],
+    extends: ['eslint:recommended', 'plugin:@typescript-eslint/recommended', 'prettier'],
+    rules: {
+        '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+    },
+    ignorePatterns: ['node_modules/', 'dist/'],
+}

.gitignore

@@ -1,2 +1,3 @@
 node_modules
-dist
+dist
+package-lock.json

.prettierrc.json

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+{
+    "trailingComma": "es5",
+    "tabWidth": 4,
+    "printWidth": 100,
+    "semi": false,
+    "singleQuote": true,
+    "overrides": [
+        {
+            "files": [
+                "*.yaml",
+                "*.yml"
+            ],
+            "options": {
+                "tabWidth": 2
+            }
+        }
+    ]
+}

.vscode/settings.json

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

README.md

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+# Advent of Code 2021
+
+## Getting started:
+
+```
+npm install
+```
+
+## Running solutions:
+
+```
+npm start -w day-<x>
+```
+
+```
+npm start -w day-1
+```

__template__/index.ts

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+import { getInputAsLines, getTestInputAsLines } from '../shared/input'
+
+const partOne = undefined
+const partTwo = undefined
+
+console.log('Part one:', partOne)
+console.log('Part two:', partTwo)

__template__/package.json

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+{
+    "scripts": {
+        "start": "ts-node index.ts"
+    }
+}

package.json

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+{
+    "name": "aoc2021",
+    "version": "1.0.0",
+    "description": "Advent of Code 2021",
+    "scripts": {
+        "start": "echo \"Specify a workspace, e.g: npm start -w day-1\" && exit 1",
+        "format": "prettier -w '**/*.ts'"
+    },
+    "workspaces": [
+        "./day-*"
+    ],
+    "author": "Bas Verhoeven",
+    "license": "ISC",
+    "devDependencies": {
+        "@types/node": "^16.11.11",
+        "@typescript-eslint/eslint-plugin": "^5.5.0",
+        "@typescript-eslint/parser": "^5.5.0",
+        "eslint": "^8.3.0",
+        "eslint-config-prettier": "^8.3.0",
+        "prettier": "^2.5.0",
+        "ts-node": "^10.4.0",
+        "typescript": "^4.5.2"
+    }
+}

shared/input.ts

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+import { readFileSync } from 'node:fs'
+
+export function getInput(filename = 'input.txt'): string {
+    return readFileSync(filename, 'utf8').trim()
+}
+
+export function getInputAsLines(filename = 'input.txt'): string[] {
+    return getInput(filename).split('\n')
+}
+
+export function getTestInputAsLines(filename = 'test_input.txt'): string[] {
+    return getInputAsLines(filename)
+}