# Angular 17.3.0 xlsx audio buffer

Resolves "Buffer is not constructor" error in Angular 17 and demonstrates correct Buffer polyfill setup in a minimal working example.


When working with `Buffer` in Angular 17, you might encounter the error:

```ts
Buffer is not constructor
var global = global || window;
var Buffer = Buffer || [];
```

### 1. Install dependencies
```bash
pnpm rm xlsx
pnpm buffer 
pnpm install --save https://cdn.sheetjs.com/xlsx-0.20.3/xlsx-0.20.3.tgz
```
### 2. Create/update polyfills.ts
```ts
import { Buffer } from 'buffer';
(window as any).Buffer = Buffer;
```


### Running the Demo
* Don't set up Buffer in index.html
* Don't use new Buffer() (deprecated)

### What This Demo Includes
* Proper Buffer polyfill setup
* Binary data handling example
* File processing with SheetJS
* Working audio file metadata extraction