electron 38.8.6: IpcMainEvent

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify electron.IpcMainEvent in pkg:npm/electron@38.8.6
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/electron@38.8.6
Demonstrate these symbols/APIs:
  - electron.IpcMainEvent

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:ca2b514aa9c84454dbcd54839278257c01e7244a5a4427a862fad4261335fb47","contract":["electron type definitions declare IpcMainEvent interface with frameId, processId, returnValue, sender, senderFrame, ports, reply, and type properties across namespaces","createIpcMainEvent factory constructs an IpcMainEvent instance with sender, frame identification, process identification, and event properties","IpcMainEvent reply method sends responses to the sender webContents frame on specified reply channels","IpcMainEvent returnValue property captures synchronous IPC reply values and supports custom return payloads","IpcMainEvent manages event propagation control with preventDefault and defaultPrevented state","createIpcMainDispatcher dispatches IPC events to registered listeners and invokes reply callbacks with event context"],"goal":"verify electron.IpcMainEvent in pkg:npm/electron@38.8.6","kind":"HOW","packages":["pkg:npm/electron@38.8.6"],"schemaVersion":1,"symbols":["electron.IpcMainEvent"]},"contractCommand":["node","test/contract.cjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/electron@38.8.6"],"schemaVersion":1,"subject":"pkg:npm/electron@38.8.6","symbols":["electron.IpcMainEvent"],"verifierAdapter":"node-typescript@1"}

'use strict';

const fs = require('node:fs');
const path = require('node:path');
const { EventEmitter } = require('node:events');

/**
 * Reads and inspects electron.IpcMainEvent TypeScript definitions from the electron package.
 * @returns {{
 *   hasIpcMainEvent: boolean,
 *   properties: string[],
 *   namespaces: {
 *     main: boolean,
 *     common: boolean,
 *     renderer: boolean,
 *     utility: boolean,
 *     crossProcessExports: boolean
 *   },
 *   ipcMainListenerSignatures: boolean
 * }}
 */
function getIpcMainEventDeclarations() {
  const electronDir = path.dirname(require.resolve('electron/package.json'));
  const dtsPath = path.join(electronDir, 'electron.d.ts');
  const dtsContent = fs.readFileSync(dtsPath, 'utf-8');

  const properties = [];
  const interfaceMatch = dtsContent.match(/interface\s+IpcMainEvent\s+extends\s+Event\s*\{([\s\S]*?)\}/);
  if (interfaceMatch) {
    const body = interfaceMatch[1];
    const expectedProps = [
      'frameId',
      'processId',
      'returnValue',
      'sender',
      'senderFrame',
      'ports',
      'reply',
      'type'
    ];
    for (const prop of expectedProps) {
      if (new RegExp(`\\b${prop}\\b`).test(body)) {
        properties.push(prop);
      }
    }
  }

  const namespaces = {
    main: /namespace\s+Main\s*\{[\s\S]*?type\s+IpcMainEvent\s*=\s*Electron\.IpcMainEvent;/m.test(dtsContent),
    common: /namespace\s+Common\s*\{[\s\S]*?type\s+IpcMainEvent\s*=\s*Electron\.IpcMainEvent;/m.test(dtsContent),
    renderer: /namespace\s+Renderer\s*\{[\s\S]*?type\s+IpcMainEvent\s*=\s*Electron\.IpcMainEvent;/m.test(dtsContent),
    utility: /namespace\s+Utility\s*\{[\s\S]*?type\s+IpcMainEvent\s*=\s*Electron\.IpcMainEvent;/m.test(dtsContent),
    crossProcessExports: /namespace\s+CrossProcessExports\s*\{[\s\S]*?type\s+IpcMainEvent\s*=\s*Electron\.IpcMainEvent;/m.test(dtsContent)
  };

  const ipcMainListenerSignatures = /addListener\(channel:\s*string,\s*listener:\s*\(event:\s*IpcMainEvent,\s*\.\.\.args:\s*any\[\]\)\s*=>\s*void\)/.test(dtsContent)
    && /on\(channel:\s*string,\s*listener:\s*\(event:\s*IpcMainEvent,\s*\.\.\.args:\s*any\[\]\)\s*=>\s*void\)/.test(dtsContent)
    && /once\(channel:\s*string,\s*listener:\s*\(event:\s*IpcMainEvent,\s*\.\.\.args:\s*any\[\]\)\s*=>\s*void\)/.test(dtsContent)
    && /off\(channel:\s*string,\s*listener:\s*\(event:\s*IpcMainEvent,\s*\.\.\.args:\s*any\[\]\)\s*=>\s*void\)/.test(dtsContent);

  return {
    hasIpcMainEvent: properties.length === 8,
    properties,
    namespaces,
    ipcMainListenerSignatures
  };
}

/**
 * Creates an IpcMainEvent compliant object representing an incoming IPC event from a renderer.
 * @param {object} options
 * @param {number} [options.frameId=0]
 * @param {number} [options.processId=1]
 * @param {any} [options.returnValue=undefined]
 * @param {object} [options.sender]
 * @param {object|null} [options.senderFrame=null]
 * @param {Array} [options.ports=[]]
 * @param {Function} [options.replyCallback]
 * @param {'frame'} [options.type='frame']
 * @returns {object} IpcMainEvent instance
 */
function createIpcMainEvent(options = {}) {
  const {
    frameId = 0,
    processId = 1,
    returnValue = undefined,
    sender = {
      send(channel, ...args) {
        // default mock sender
      }
    },
    senderFrame = null,
    ports = [],
    replyCallback = null,
    type = 'frame'
  } = options;

  let _defaultPrevented = false;
  let _returnValue = returnValue;

  const event = {
    frameId: Number(frameId),
    processId: Number(processId),
    sender,
    get senderFrame() {
      return senderFrame;
    },
    ports: Array.isArray(ports) ? [...ports] : [],
    type,
    get returnValue() {
      return _returnValue;
    },
    set returnValue(val) {
      _returnValue = val;
    },
    get defaultPrevented() {
      return _defaultPrevented;
    },
    preventDefault() {
      _defaultPrevented = true;
    },
    reply(channel, ...args) {
      if (typeof channel !== 'string' || channel.length === 0) {
        throw new TypeError('IPC reply channel must be a non-empty string');
      }
      if (typeof replyCallback === 'function') {
        replyCallback(channel, ...args);
      } else if (sender && typeof sender.send === 'function') {
        sender.send(channel, ...args);
      } else {
        throw new Error('Cannot reply to IPC message: no valid sender or replyCallback');
      }
    }
  };

  return event;
}

/**
 * Validates that an object conforms to the structural contract of Electron.IpcMainEvent.
 * @param {any} event
 * @returns {boolean}
 */
function validateIpcMainEvent(event) {
  if (!event || typeof event !== 'object') {
    return false;
  }
  const hasValidFrameId = typeof event.frameId === 'number';
  const hasValidProcessId = typeof event.processId === 'number';
  const hasValidSender = Boolean(event.sender && (typeof event.sender === 'object' || typeof event.sender === 'function'));
  const hasValidPorts = Array.isArray(event.ports);
  const hasValidReply = typeof event.reply === 'function';
  const hasPreventDefault = typeof event.preventDefault === 'function';
  const hasDefaultPrevented = typeof event.defaultPrevented === 'boolean';

  return Boolean(
    hasValidFrameId &&
    hasValidProcessId &&
    hasValidSender &&
    hasValidPorts &&
    hasValidReply &&
    hasPreventDefault &&
    hasDefaultPrevented
  );
}

/**
 * Creates an IPC event dispatcher that manages listeners and dispatches IpcMainEvent instances.
 * @returns {object}
 */
function createIpcMainDispatcher() {
  const emitter = new EventEmitter();

  return {
    on(channel, listener) {
      if (typeof channel !== 'string') throw new TypeError('Channel must be a string');
      if (typeof listener !== 'function') throw new TypeError('Listener must be a function');
      emitter.on(channel, listener);
      return this;
    },
    once(channel, listener) {
      if (typeof channel !== 'string') throw new TypeError('Channel must be a string');
      if (typeof listener !== 'function') throw new TypeError('Listener must be a function');
      emitter.once(channel, listener);
      return this;
    },
    off(channel, listener) {
      emitter.off(channel, listener);
      return this;
    },
    removeListener(channel, listener) {
      emitter.removeListener(channel, listener);
      return this;
    },
    removeAllListeners(channel) {
      emitter.removeAllListeners(channel);
      return this;
    },
    listenerCount(channel) {
      return emitter.listenerCount(channel);
    },
    emit(channel, event, ...args) {
      if (!validateIpcMainEvent(event)) {
        throw new TypeError('First argument must be a valid IpcMainEvent');
      }
      return emitter.emit(channel, event, ...args);
    },
    handleSync(channel, event, ...args) {
      if (!validateIpcMainEvent(event)) {
        throw new TypeError('First argument must be a valid IpcMainEvent');
      }
      emitter.emit(channel, event, ...args);
      return event.returnValue;
    }
  };
}

module.exports = {
  getIpcMainEventDeclarations,
  createIpcMainEvent,
  validateIpcMainEvent,
  createIpcMainDispatcher
};

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{
  "name": "sample-electron-ipcmainevent",
  "version": "1.0.0",
  "description": "verify electron.IpcMainEvent in pkg:npm/electron@38.8.6",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "electron": "38.8.6"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify electron.IpcMainEvent in pkg:npm/electron@38.8.6",
  "kind": "HOW",
  "packages": [
    "pkg:npm/electron@38.8.6"
  ],
  "symbols": [
    "electron.IpcMainEvent"
  ]
}

'use strict';

const assert = require('node:assert');
const {
  getIpcMainEventDeclarations,
  createIpcMainEvent,
  validateIpcMainEvent,
  createIpcMainDispatcher
} = require('../index.js');

async function runTests() {
  // Contract 1: electron type definitions declare IpcMainEvent interface with frameId, processId, returnValue, sender, senderFrame, ports, reply, and type properties across namespaces
  {
    const decl = getIpcMainEventDeclarations();
    assert.strictEqual(decl.hasIpcMainEvent, true, 'IpcMainEvent interface must declare all 8 core properties');
    assert.ok(decl.properties.includes('frameId'), 'Must include frameId');
    assert.ok(decl.properties.includes('processId'), 'Must include processId');
    assert.ok(decl.properties.includes('returnValue'), 'Must include returnValue');
    assert.ok(decl.properties.includes('sender'), 'Must include sender');
    assert.ok(decl.properties.includes('senderFrame'), 'Must include senderFrame');
    assert.ok(decl.properties.includes('ports'), 'Must include ports');
    assert.ok(decl.properties.includes('reply'), 'Must include reply');
    assert.ok(decl.properties.includes('type'), 'Must include type');

    assert.strictEqual(decl.namespaces.main, true, 'IpcMainEvent must be aliased in Main namespace');
    assert.strictEqual(decl.namespaces.common, true, 'IpcMainEvent must be aliased in Common namespace');
    assert.strictEqual(decl.namespaces.renderer, true, 'IpcMainEvent must be aliased in Renderer namespace');
    assert.strictEqual(decl.namespaces.utility, true, 'IpcMainEvent must be aliased in Utility namespace');
    assert.strictEqual(decl.namespaces.crossProcessExports, true, 'IpcMainEvent must be aliased in CrossProcessExports namespace');
    assert.strictEqual(decl.ipcMainListenerSignatures, true, 'IpcMain listener methods must accept IpcMainEvent as first argument');
  }

  // Contract 2: createIpcMainEvent factory constructs an IpcMainEvent instance with sender, frame identification, process identification, and event properties
  {
    const mockSender = {
      id: 42,
      send(ch, ...args) {}
    };
    const mockFrame = {
      frameId: 101,
      name: 'child-iframe'
    };
    const mockPort = { id: 'port-1' };

    const event = createIpcMainEvent({
      frameId: 101,
      processId: 202,
      sender: mockSender,
      senderFrame: mockFrame,
      ports: [mockPort],
      type: 'frame'
    });

    assert.strictEqual(event.frameId, 101, 'frameId must match provided value');
    assert.strictEqual(event.processId, 202, 'processId must match provided value');
    assert.strictEqual(event.sender, mockSender, 'sender must match provided webContents');
    assert.strictEqual(event.senderFrame, mockFrame, 'senderFrame must match provided frame');
    assert.deepStrictEqual(event.ports, [mockPort], 'ports must match transferred message ports');
    assert.strictEqual(event.type, 'frame', 'type must equal frame');
    assert.strictEqual(validateIpcMainEvent(event), true, 'Constructed event must pass validation');

    // Default initialization
    const defaultEvent = createIpcMainEvent();
    assert.strictEqual(defaultEvent.frameId, 0);
    assert.strictEqual(defaultEvent.processId, 1);
    assert.strictEqual(defaultEvent.type, 'frame');
    assert.deepStrictEqual(defaultEvent.ports, []);
    assert.strictEqual(validateIpcMainEvent(defaultEvent), true);

    // Validation rejects non-compliant objects
    assert.strictEqual(validateIpcMainEvent(null), false);
    assert.strictEqual(validateIpcMainEvent({ frameId: 'invalid' }), false);
    assert.strictEqual(validateIpcMainEvent({ frameId: 1, processId: 1 }), false);
  }

  // Contract 3: IpcMainEvent reply method sends responses to the sender webContents frame on specified reply channels
  {
    const replies = [];
    const mockSender = {
      send(channel, ...args) {
        replies.push({ channel, args });
      }
    };

    const event = createIpcMainEvent({ sender: mockSender });
    event.reply('response-channel', { success: true }, 123);

    assert.strictEqual(replies.length, 1);
    assert.strictEqual(replies[0].channel, 'response-channel');
    assert.deepStrictEqual(replies[0].args, [{ success: true }, 123]);

    // Custom replyCallback takes precedence
    const customReplies = [];
    const customEvent = createIpcMainEvent({
      sender: mockSender,
      replyCallback(channel, ...args) {
        customReplies.push({ channel, args });
      }
    });
    customEvent.reply('custom-channel', 'custom-payload');
    assert.strictEqual(customReplies.length, 1);
    assert.strictEqual(customReplies[0].channel, 'custom-channel');
    assert.deepStrictEqual(customReplies[0].args, ['custom-payload']);
    assert.strictEqual(replies.length, 1, 'Mock sender should not have received message when replyCallback is set');

    // Error on invalid channel
    assert.throws(() => {
      event.reply('');
    }, /IPC reply channel must be a non-empty string/);
    assert.throws(() => {
      event.reply(null);
    }, /IPC reply channel must be a non-empty string/);
  }

  // Contract 4: IpcMainEvent returnValue property captures synchronous IPC reply values and supports custom return payloads
  {
    const event = createIpcMainEvent();
    assert.strictEqual(event.returnValue, undefined, 'returnValue starts as undefined');

    event.returnValue = 'sync-result-string';
    assert.strictEqual(event.returnValue, 'sync-result-string');

    const complexData = { code: 200, items: [1, 2, 3] };
    event.returnValue = complexData;
    assert.deepStrictEqual(event.returnValue, complexData);

    const dispatcher = createIpcMainDispatcher();
    dispatcher.on('get-config', (e, section) => {
      e.returnValue = { section, enabled: true };
    });

    const syncEvent = createIpcMainEvent();
    const result = dispatcher.handleSync('get-config', syncEvent, 'network');
    assert.deepStrictEqual(result, { section: 'network', enabled: true });
    assert.deepStrictEqual(syncEvent.returnValue, { section: 'network', enabled: true });
  }

  // Contract 5: IpcMainEvent manages event propagation control with preventDefault and defaultPrevented state
  {
    const event = createIpcMainEvent();
    assert.strictEqual(event.defaultPrevented, false, 'defaultPrevented should initially be false');

    event.preventDefault();
    assert.strictEqual(event.defaultPrevented, true, 'defaultPrevented should be true after preventDefault() call');
  }

  // Contract 6: createIpcMainDispatcher dispatches IPC events to registered listeners and invokes reply callbacks with event context
  {
    const dispatcher = createIpcMainDispatcher();
    let onReceivedEvent = null;
    let onReceivedArgs = null;
    let onceCount = 0;

    dispatcher.on('ping', (event, arg1, arg2) => {
      onReceivedEvent = event;
      onReceivedArgs = [arg1, arg2];
      event.reply('pong', 'ack');
    });

    dispatcher.once('ping-once', (event) => {
      onceCount++;
    });

    const replies = [];
    const event1 = createIpcMainEvent({
      frameId: 5,
      processId: 10,
      replyCallback: (channel, ...args) => {
        replies.push({ channel, args });
      }
    });

    dispatcher.emit('ping', event1, 'hello', 42);
    assert.strictEqual(onReceivedEvent, event1);
    assert.deepStrictEqual(onReceivedArgs, ['hello', 42]);
    assert.strictEqual(replies.length, 1);
    assert.strictEqual(replies[0].channel, 'pong');
    assert.deepStrictEqual(replies[0].args, ['ack']);

    // Test once behavior
    const event2 = createIpcMainEvent();
    dispatcher.emit('ping-once', event2);
    assert.strictEqual(onceCount, 1);
    dispatcher.emit('ping-once', event2);
    assert.strictEqual(onceCount, 1, 'once listener must not fire a second time');

    // Test listener removal
    const tempListener = () => {};
    dispatcher.on('temp', tempListener);
    assert.strictEqual(dispatcher.listenerCount('temp'), 1);
    dispatcher.off('temp', tempListener);
    assert.strictEqual(dispatcher.listenerCount('temp'), 0);

    // Test removeAllListeners
    dispatcher.on('bulk', () => {});
    dispatcher.on('bulk', () => {});
    assert.strictEqual(dispatcher.listenerCount('bulk'), 2);
    dispatcher.removeAllListeners('bulk');
    assert.strictEqual(dispatcher.listenerCount('bulk'), 0);

    // Rejection on invalid event emit
    assert.throws(() => {
      dispatcher.emit('channel', { invalid: 'event' });
    }, /First argument must be a valid IpcMainEvent/);
  }

  console.log('Contract tests passed successfully.');
}

runTests().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});