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The Node.js Buffer API predates the introduction of ArrayBuffer into the JavaScript language. Bun implements both. Use the static Buffer.from() method to create a Buffer from an ArrayBuffer. 
const arrBuffer = new ArrayBuffer(64); const nodeBuffer = Buffer.from(arrBuffer);
To create a Buffer that only views a portion of the underlying buffer, pass the offset and length to the constructor. 
const arrBuffer = new ArrayBuffer(64); const nodeBuffer = Buffer.from(arrBuffer, 0, 16); // view first 16 bytes
See Docs > API > Binary Data for complete documentation on manipulating binary data with Bun.