38 lines
763 B
TypeScript
38 lines
763 B
TypeScript
|
import { PassThrough, Readable } from "stream";
|
||
|
|
|
||
|
|
export default function tee(input: Readable) {
|
||
|
|
const a = new PassThrough();
|
||
|
|
const b = new PassThrough();
|
||
|
|
|
||
|
|
let aFull = false;
|
||
|
|
let bFull = false;
|
||
|
|
|
||
|
|
a.on("drain", () => {
|
||
|
|
aFull = false;
|
||
|
|
if (!aFull && !bFull) input.resume();
|
||
|
|
});
|
||
|
|
b.on("drain", () => {
|
||
|
|
bFull = false;
|
||
|
|
if (!aFull && !bFull) input.resume();
|
||
|
|
});
|
||
|
|
|
||
|
|
input.on("error", e => {
|
||
|
|
a.emit("error", e);
|
||
|
|
b.emit("error", e);
|
||
|
|
});
|
||
|
|
|
||
|
|
input.on("data", chunk => {
|
||
|
|
aFull = !a.write(chunk);
|
||
|
|
bFull = !b.write(chunk);
|
||
|
|
|
||
|
|
if (aFull || bFull) input.pause();
|
||
|
|
});
|
||
|
|
|
||
|
|
input.on("end", () => {
|
||
|
|
a.end();
|
||
|
|
b.end();
|
||
|
|
});
|
||
|
|
|
||
|
|
return [a, b] as const;
|
||
|
|
}
|