@lodestar/api/lib/utils/server/parser.js

A Typescript REST client for the Ethereum Consensus API

import { MediaType } from "../headers.js";
export function addSszContentTypeParser(server) {
    server.addContentTypeParser(MediaType.ssz, { parseAs: "buffer" }, async (_request, payload) => {
        // We could just return the `Buffer` here which is a subclass of `Uint8Array` but downstream code does not require it
        // and it's better to convert it here to avoid unexpected behavior such as `Buffer.prototype.slice` not copying memory
        // See https://github.com/nodejs/node/issues/41588#issuecomment-1016269584
        return new Uint8Array(payload.buffer, payload.byteOffset, payload.byteLength);
    });
}
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