@loopback/docs/site/apidocs/metadata.designtimemethodmetadata.md

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---
lang: en
title: 'API docs: metadata.designtimemethodmetadata'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/metadata
permalink: /doc/en/lb4/apidocs.metadata.designtimemethodmetadata.html
---

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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [DesignTimeMethodMetadata](./metadata.designtimemethodmetadata.md)

## DesignTimeMethodMetadata interface

Design time metadata for a method.

**Signature:**

```typescript
export interface DesignTimeMethodMetadata 
```

## Example


```ts
class MyController
{
  myMethod(x: string, y: number, z: MyClass): boolean {
    // ...
    return true;
  }
}
```
The `myMethod` above has design-time metadata as follows:

```ts
{
  type: Function,
  parameterTypes: [String, Number, MyClass],
  returnType: Boolean
}
```

## Properties

<table><thead><tr><th>

Property


</th><th>

Modifiers


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

[parameterTypes](./metadata.designtimemethodmetadata.parametertypes.md)


</td><td markdown="1">


</td><td markdown="1">

Function\[\]


</td><td markdown="1">

An array of parameter types.


</td></tr>
<tr><td markdown="1">

[returnType](./metadata.designtimemethodmetadata.returntype.md)


</td><td markdown="1">


</td><td markdown="1">

Function \| undefined


</td><td markdown="1">

Return type, may be `undefined` (e.g. for constructors).


</td></tr>
<tr><td markdown="1">

[type](./metadata.designtimemethodmetadata.type.md)


</td><td markdown="1">


</td><td markdown="1">

Function \| undefined


</td><td markdown="1">

Type of the method itself. It is `Function` for methods, `undefined` for the constructor.


</td></tr>
</tbody></table>