execa/lib/ipc/methods.js

Process execution for humans

import process from 'node:process';
import {sendMessage} from './send.js';
import {getOneMessage} from './get-one.js';
import {getEachMessage} from './get-each.js';
import {getCancelSignal} from './graceful.js';

// Add promise-based IPC methods in current process
export const addIpcMethods = (target, subprocess, {ipc}) => {
	Object.assign(target, getIpcMethods(subprocess, false, ipc, target));
};

// Get promise-based IPC in the subprocess
export const getIpcExport = () => {
	const anyProcess = process;
	const isSubprocess = true;
	const isIpc = process.channel !== undefined;

	return {
		...getIpcMethods(anyProcess, isSubprocess, isIpc),
		getCancelSignal: getCancelSignal.bind(undefined, {
			anyProcess,
			channel: anyProcess.channel,
			isSubprocess,
			ipc: isIpc,
		}),
	};
};

// Retrieve the `ipc` shared by both the current process and the subprocess
const getIpcMethods = (anyProcess, isSubprocess, ipc, waitProcess = anyProcess) => ({
	sendMessage: sendMessage.bind(undefined, {
		anyProcess,
		channel: anyProcess.channel,
		isSubprocess,
		ipc,
	}),
	getOneMessage: getOneMessage.bind(undefined, {
		anyProcess,
		channel: anyProcess.channel,
		isSubprocess,
		ipc,
	}),
	getEachMessage: getEachMessage.bind(undefined, {
		anyProcess,
		channel: anyProcess.channel,
		isSubprocess,
		ipc,
		waitProcess,
	}),
});