Lesson 28 +10 XP

tsconfig.json & Essential Compiler Options

tsconfig.json Configuration & Compiler Options

The tsconfig.json file specifies root files and compiler options required to compile a TypeScript project.

Creating a tsconfig.json

Generate a default configuration file using:

tsc --init

Essential Compiler Options

Option	Recommended Setting	Purpose
`target`	`"ES2022"` or `"ESNext"`	Target JavaScript language version emitted.
`module`	`"NodeNext"` or `"ESNext"`	Module system specification for output code.
`strict`	`true`	Enables all strict type-checking options.
`noImplicitAny`	`true`	Raises error on expressions with implied `any` type.
`strictNullChecks`	`true`	Ensures `null` and `undefined` are handled explicitly.
`outDir`	`"./dist"`	Output directory for compiled `.js` files.
`rootDir`	`"./src"`	Root directory of input TypeScript files.

Sample tsconfig.json

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "commonjs",
    "rootDir": "./src",
    "outDir": "./dist",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  },
  "include": ["src/**/*"]
}

TL;DR

Run tsc --init to generate a starter tsconfig.json.
Always set "strict": true for maximum safety.
Use outDir and rootDir to organize build inputs and outputs cleanly.