sinProject-Inc/sinpro-dev

---
title: TypeScript Config
description: How we modify our TypeScript code style with tsconfig.json.
---

How we modify our TypeScript code style with tsconfig.json.

## TSConfig

Set strict to true, and further increase strictness by modifying the following options:

- [allowUnreachableCode](https://www.typescriptlang.org/tsconfig#allowUnreachableCode)
- [exactOptionalPropertyTypes](https://www.typescriptlang.org/tsconfig#exactOptionalPropertyTypes)
- [noImplicitOverride](https://www.typescriptlang.org/tsconfig#noImplicitOverride)
- [noImplicitReturns](https://www.typescriptlang.org/tsconfig#noImplicitReturns)
- [noFallthroughCasesInSwitch](https://www.typescriptlang.org/tsconfig#noFallthroughCasesInSwitch)

```json:tsconfig.json
{
    "extends": "./.svelte-kit/tsconfig.json",
    "compilerOptions": {
        "strict": true,

        "allowUnusedLabels": false,
        "allowUnreachableCode": false,
        "exactOptionalPropertyTypes": true,
        "noFallthroughCasesInSwitch": true,
        "noImplicitOverride": true,
        "noImplicitReturns": true,
        "noPropertyAccessFromIndexSignature": true,
        "noUncheckedIndexedAccess": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,

        "isolatedModules": true,
    }
}
```