pipe.js•1.19 kB
import {createWriteStream} from 'node:fs';
import {ChildProcess} from 'node:child_process';
import {isWritableStream} from 'is-stream';
const isExecaChildProcess = target => target instanceof ChildProcess && typeof target.then === 'function';
const pipeToTarget = (spawned, streamName, target) => {
if (typeof target === 'string') {
spawned[streamName].pipe(createWriteStream(target));
return spawned;
}
if (isWritableStream(target)) {
spawned[streamName].pipe(target);
return spawned;
}
if (!isExecaChildProcess(target)) {
throw new TypeError('The second argument must be a string, a stream or an Execa child process.');
}
if (!isWritableStream(target.stdin)) {
throw new TypeError('The target child process\'s stdin must be available.');
}
spawned[streamName].pipe(target.stdin);
return target;
};
export const addPipeMethods = spawned => {
if (spawned.stdout !== null) {
spawned.pipeStdout = pipeToTarget.bind(undefined, spawned, 'stdout');
}
if (spawned.stderr !== null) {
spawned.pipeStderr = pipeToTarget.bind(undefined, spawned, 'stderr');
}
if (spawned.all !== undefined) {
spawned.pipeAll = pipeToTarget.bind(undefined, spawned, 'all');
}
};