Function bigintToBuffer

bigintToBuffer(
    int: bigint,
    padding: number,
    litte?: boolean,
    signed?: boolean,
): Buffer
Converts a JS native bigint value into a Node.js Buffer with custom byte-padding, endianness, and sign representation.
Parameters
- int: bigint
  The bigint value to serialize into the buffer.
- padding: number
  The absolute target size of the output buffer in bytes.
- litte: boolean = true
  Set to true for little-endian encoding; set to false for big-endian. Defaults to true.
- signed: boolean = false
  Set to true to allow signed integers and two's complement representation. Defaults to false.
Returns Buffer
A new Buffer representation of the bigint value.
Remarks
This utility handles both signed and unsigned numeric translations. For signed negative bigints, it computes the manual two's complement transformation in either little-endian or big-endian formats to match Telegram MTProto specifications.

Throws
If the bigint requires more bytes to represent than the specified padding size.

Throws
If the bigint is negative and signed is set to false.
Example
```
// Unsigned little-endian 4-byte padding
const buf = bigintToBuffer(BigInt(42), 4, true, false);
```
- Defined in src/helpers.ts:36