Function writeTags

writeTags(
input: AudioInput,
tags: TagsToWrite,
): Promise<Uint8Array<ArrayBufferLike> | null>
Write tags to an audio file and return the modified audio data as a Uint8Array.

The input data is copied into an in-memory buffer; the original input is never mutated. Only the fields present in tags are changed — any field that is undefined keeps its existing value in the file.
Parameters
- input: AudioInput
  The audio data to modify.
- tags: TagsToWrite
  The tag fields to write.
Returns Promise<Uint8Array<ArrayBufferLike> | null>
The modified audio data as a Uint8Array, or null if the format is not recognised, the file is invalid, or the save failed.
Example
```
import { writeTags } from 'taglib';

const modified = await writeTags(file, {
  title: 'My Track',
  artist: 'My Artist',
  year: 2024,
});

if (modified) {
  const blob = new Blob([modified], { type: 'audio/mpeg' });
  // offer blob for download, etc.
}
```
- Defined in simpleApi.ts:201