method Buffer.writeInt8
Usage in Deno
```typescript import { type Buffer } from "node:node__buffer.d.ts"; ```
Buffer.writeInt8(value: number,offset?: number,): number
Writes `value` to `buf` at the specified `offset`. `value` must be a valid
signed 8-bit integer. Behavior is undefined when `value` is anything other than
a signed 8-bit integer.
`value` is interpreted and written as a two's complement signed integer.
```js
import { Buffer } from 'node:buffer';
const buf = Buffer.allocUnsafe(2);
buf.writeInt8(2, 0);
buf.writeInt8(-2, 1);
console.log(buf);
// Prints:
```
number
`offset` plus the number of bytes written.