jtd-to-ts.js

const fsPromise = require('fs/promises');
const { tmpdir } = require('os');
const path = require('path');
const { spawn } = require('child_process');
const streamBuffers = require('stream-buffers');

async function jtdToTS(jtdPath) {
    let tmpDir = await fsPromise.mkdtemp(`${tmpdir()}${path.sep}`);
    let child = spawn('jtd-codegen', [jtdPath, '--typescript-out', tmpDir]);
    let errbuf = new streamBuffers.WritableStreamBuffer();
    child.stderr.pipe(errbuf);
    let promise = new Promise((resolve, reject) => {
        child.on('error', (err) => {
            fsPromise.rmdir(tmpDir, { recursive: true });
            reject(err);
        });
        child.on('exit', async (code) => {
            if (code != 0) {
                fsPromise.rmdir(tmpDir, { recursive: true }).catch((err) => {
                    console.error(err);
                });
                reject(
                    `jtd-codegen failed on ${jtdPath}: \n${errbuf.getContentsAsString()}`
                );
            } else {
                let interface = await fsPromise.readFile(
                    path.join(tmpDir, 'index.ts')
                );
                fsPromise.rmdir(tmpDir, { recursive: true }).catch((err) => {
                    console.error(err);
                });
                resolve(interface);
            }
        });
    });
    return promise;
}

Utility function for facilitating a gulp plugin for jtd-codegen