estree Agent Skills & AI Rules

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This document specifies the extensions to the [core ESTree AST types](es5.md) to support type annotations.

- [Type Annotations](#typeannotations)
- [Identifier](#identifier)
- [Functions](#functions)
- [Patterns](#patterns)
  - [ObjectPattern](#objectpattern)
  - [ArrayPattern](#arraypattern)
  - [RestElement](#restelement)

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# Type Annotations

```js
interface TypeAnnotation <: Node { }
```

Any type annotation.

# Identifier

```js
extend interface Identifier {
    typeAnnotation: TypeAnnotation | null;
}
```

The `typeAnnotation` property is used only in the case of variable declarations with type annotations or function arguments with type annotations.

# Functions

```js
extend interface Function {
    returnType: TypeAnnotation | null;
}
```

The `returnType` property is used to specify the type annotation for the return value of the function.

# Patterns

## ObjectPattern

```js
extend interface ObjectPattern {
    typeAnnotation: TypeAnnotation | null;
}
```

## ArrayPattern

```js
extend interface ArrayPattern {
    typeAnnotation: TypeAnnotation | null;
}
```

## RestElement

```js
extend interface RestElement {
    typeAnnotation: TypeAnnotation | null;
}
```