My goal is to spawn another binary file in a child process, then handle the stdout on a line-by-line basis (And do some processing against that line). For testing I'm using Node. To do this I tried a readable & writable stream but it a type error is throwed saying "The argument 'stdio' is invalid. Received Writable"
const rs = new stream.Readable();
const ws = new stream.Writable();
const child = cp.spawn("node", [], {
stdio: [process.stdin, ws, process.stderr]
})
let count = 0;
ws.on("data", (data) => {
console.log(data, count)
});
Anyone have any ideas?
One way is to use the stdio streams returned by spawn and manually pipe them:
const child = cp.spawn("node", [])
child.stdin.pipe(process.stdin)
child.stdout.pipe(ws)
child.stderr.pipe(process.stderr)
let count = 0;
ws.on("data", (data) => {
console.log(data, count)
});