---
title: Instantiating
---

## Instantiating

Use the default export from `"ts-simple-ast"`:

```typescript
import Ast from "ts-simple-ast";

const ast = new Ast();
```

### Custom compiler options

```typescript
import * as ts from "typescript";

const ast = new Ast({
    compilerOptions: {
        target: ts.ScriptTarget.ES3
    }
});
```

### Custom tsconfig.json

By default, if a *tsconfig.json* is found in the current working directory then it will use that file for the *tsconfig.json*.

If you would like to manually specify the path to a *tsconfig.json* file then specify that:

```typescript
const ast = new Ast({
    tsConfigFilePath: "path/to/tsconfig.json"
});
```