TypeScript Configuration tsconfig

tsconfig.json controls how TypeScript works.

    ## Why tsconfig?
    - compiler behavior
    - strictness
    - build output
    
    ## Basic example
    
    ```json
    {
      "compilerOptions": {
        "target": "ES2020",
        "module": "ESNext",
        "strict": true,
        "outDir": "./dist"
      },
      "include": ["src"]
    }
    ```
    
    ## Important options
    - strict: turn on all safety checks
    - noImplicitAny: forbid implicit any
    - strictNullChecks: handle null safely
    - outDir: output folder
    
    ## Graph
    ```mermaid
    flowchart TD
      A[tsconfig.json] --> B[Compiler]
      B --> C[JS Output]
    ```
    
    ## Remember
    - Always use strict: true
    - tsconfig defines project rules