@callstack/repack-dev-server/dist/plugins/multipart/multipartPlugin.js

A bundler-agnostic development server for React Native applications as part of @callstack/repack.

import { PassThrough } from 'node:stream';
import fastifyPlugin from 'fastify-plugin';
/**
 * Implementation is based on:
 * https://github.com/facebook/metro/blob/347b1d7ed87995d7951aaa9fd597c04b06013dac/packages/metro/src/Server/MultipartResponse.js
 */
const CRLF = '\r\n';
const BOUNDARY = '3beqjf3apnqeu3h5jqorms4i';
async function multipartPlugin(instance) {
    function asMultipart() {
        // We should check if is included in accept or if accept has multipart/* or */*,
        // but React Native will set accept to exactly `multipart/mixed`, so a simple check
        // will suffice.
        if (this.request.headers.accept !== 'multipart/mixed') {
            return undefined;
        }
        const headers = {};
        const stream = new PassThrough();
        this.code(200)
            .header('Content-Type', `multipart/mixed; boundary="${BOUNDARY}"`)
            .send(stream);
        function serializeHeaders(headers) {
            return Object.keys(headers)
                .map((key) => `${key}: ${headers[key]}`)
                .join(CRLF);
        }
        function writeChunk(headers, data, isLast) {
            let chunk = `${CRLF}--${BOUNDARY}${CRLF}`;
            if (headers) {
                chunk += serializeHeaders(headers) + CRLF + CRLF;
            }
            if (data) {
                chunk += data;
            }
            if (isLast) {
                chunk += `${CRLF}--${BOUNDARY}--${CRLF}`;
            }
            stream.write(chunk);
        }
        function setHeader(name, value) {
            headers[name] = value;
        }
        function end(data) {
            writeChunk(headers, data, true);
            stream.end();
        }
        return {
            writeChunk,
            setHeader,
            end,
        };
    }
    instance.decorateReply('asMultipart', asMultipart);
}
export default fastifyPlugin(multipartPlugin, {
    name: 'multipart-plugin',
});