electron/spec/fixtures/api/singleton/main.js

const {app} = require('electron')

app.once('ready', () => {
  console.log('started')  // ping parent
})

const gotTheLock = app.requestSingleInstanceLock()

app.on('second-instance', () => {
  setImmediate(() => app.exit(0))
})

if (!gotTheLock) {
  app.exit(1)
}
spec: Add test case for app.makeSingleInstance 2017-09-20 02:58:10 +00:00			`const {app} = require('electron')`

Exit gracefully on linux (#12139) * Fix timing issue in singleton fixture. Singleton now sends the "we've started" message out only after it's received a `'ready'` event from `app`. Previously it sent the message out immediately, resulting in the parent test trying to manipulate it before Singleton's event loop was fully bootstrapped. * Check for graceful exits on Linux, too. Rewrite the "exits gracefully on macos" spec to run on Linux too. * Check for graceful exits everywhere. * Tweak comment * Better error logging in api-app-spec.js. (#12122) In the 'exits gracefully' test for app.exit(exitCode), print the relevant error information if the test fails. * Run the exit-gracefully test on macOS and Linux. Windows does not support sending signals, but Node.js offers some emulation with process.kill(), and subprocess.kill(). Sending signal 0 can be used to test for the existence of a process. Sending SIGINT, SIGTERM, and SIGKILL cause the unconditional termination of the target process. So, we'll need a different approach if we want to test this in win32. 2018-03-07 03:01:17 +00:00			`app.once('ready', () => {`
			`console.log('started') // ping parent`
			`})`
spec: Add test case for app.makeSingleInstance 2017-09-20 02:58:10 +00:00
feat: new makeSingleInstance API (#12782) * Refactor app.makeSingleInstance * new API `app.isPrimaryInstance()` * new API `app.isSingleInstance()` * new event `app.on('second-instance')` * deprecated old syntax `app.makeSingleInstance(cb)` * deprecated old syntax of `app.makeSingleInstance() --> bool` in favor of `app.isPrimaryInstance()` * Fix spec, we don't need process.nextTick hacks any more * Make deprecation TODO for the return value of makeSingleInstance * Refactor makeSingleInstance to requestSingleInstanceLock and add appropriate deprecation comments * I swear this isn't tricking the linter * Make const * Add deprecation warnings for release, and add to planned-breaking-changes BREAKING CHANGE 2018-05-07 15:29:18 +00:00			`const gotTheLock = app.requestSingleInstanceLock()`

			`app.on('second-instance', () => {`
			`setImmediate(() => app.exit(0))`
spec: Add test case for app.makeSingleInstance 2017-09-20 02:58:10 +00:00			`})`

feat: new makeSingleInstance API (#12782) * Refactor app.makeSingleInstance * new API `app.isPrimaryInstance()` * new API `app.isSingleInstance()` * new event `app.on('second-instance')` * deprecated old syntax `app.makeSingleInstance(cb)` * deprecated old syntax of `app.makeSingleInstance() --> bool` in favor of `app.isPrimaryInstance()` * Fix spec, we don't need process.nextTick hacks any more * Make deprecation TODO for the return value of makeSingleInstance * Refactor makeSingleInstance to requestSingleInstanceLock and add appropriate deprecation comments * I swear this isn't tricking the linter * Make const * Add deprecation warnings for release, and add to planned-breaking-changes BREAKING CHANGE 2018-05-07 15:29:18 +00:00			`if (!gotTheLock) {`
spec: Add test case for app.makeSingleInstance 2017-09-20 02:58:10 +00:00			`app.exit(1)`
			`}`