### Invoke a local Lambda function using @vercel/fun

Source: https://github.com/vercel/fun/blob/main/README.md

This example demonstrates how to use the `@vercel/fun` library to create, invoke, and destroy a local serverless function. It configures the function with a directory, handler, runtime, environment variables, and memory size, then invokes it with a payload and logs the result. The `createFunction` call sets up the local server, and `fn.destroy()` cleans up resources.

```javascript
import { createFunction } from '@vercel/fun';

async function main() {
	// Starts up the necessary server to be able to invoke the function
	const fn = await createFunction({
		Code: {
			// `ZipFile` works, or an already unzipped directory may be specified
			Directory: __dirname + '/example'
		},
		Handler: 'index.handler',
		Runtime: 'nodejs8.10',
		Environment: {
			Variables: {
				HELLO: 'world'
			}
		},
		MemorySize: 512
	});

	// Invoke the function with a custom payload. A new instance of the function
	// will be initialized if there is not an available one ready to process.
	const res = await fn({ hello: 'world' });

	console.log(res);
	// Prints: { hello: 'world' }

	// Once we are done with the function, destroy it so that the processes are
	// cleaned up, and the API server is shut down (useful for hot-reloading).
	await fn.destroy();
}

main().catch(console.error);
```

--------------------------------

### Supported Runtimes for @vercel/fun

Source: https://github.com/vercel/fun/blob/main/README.md

This section details the various AWS Lambda runtimes that `ƒun` supports for local development. It specifies the runtime identifiers and their corresponding Node.js or Python versions, or other language specifics like Go and custom runtimes.

```APIDOC
Runtimes Supported:
- nodejs: Node.js Lambda functions using system `node` binary
- nodejs6.10: Node.js Lambda functions using downloaded Node v6.10.0 binary
- nodejs8.10: Node.js Lambda functions using downloaded Node v8.10.0 binary
- nodejs10.x: Node.js Lambda functions using downloaded Node v10.15.3 binary
- nodejs12.x: Node.js Lambda functions using downloaded Node v12.22.7 binary
- nodejs14.x: Node.js Lambda functions using downloaded Node v14.18.1 binary
- python: Python Lambda functions using system `python` binary
- python2.7: Python Lambda functions using downloaded Python v2.7.12 binary
- python3: Python Lambda functions using system `python3` binary (or fallback to `python`)
- python3.6: Python Lambda functions using downloaded Python v3.6.8 binary
- python3.7: Python Lambda functions using downloaded Python v3.7.2 binary
- go1.x: Lambda functions written in Go - binary must be compiled for your platform
- provided: Custom runtimes
```

--------------------------------

### Define a basic Node.js Lambda function

Source: https://github.com/vercel/fun/blob/main/README.md

This snippet shows a simple Node.js Lambda function that returns a 'hello: world' object when invoked. It uses the standard `exports.handler` signature for AWS Lambda, making it compatible with the `ƒun` local runtime.

```javascript
// example/index.js
exports.handler = function(event, context, callback) {
	callback(null, { hello: 'world' });
};
```

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