This project provides a TypeScript Node.js ES6 module with a class to check if a more recent version of a npm package is available.

The open source project is hosted on GitHub as xpack/update-checker-ts.

This page documents how to use this module in an user application. For maintainer information, see the separate README-MAINTAINER page.

A recent Node.js (>=16.0.0), since the TypeScript code is compiled into ECMAScript 2020 code with ES6 modules.

The module is available as @xpack/update-checker from the public npmjs repository; it can be added as a dependency to any TypeScript or JavaScript project with npm install:

npm install --save @xpack/update-checker@latest

The module does not provide any executables, and generally there are no reasons to install it globally.

This section is intended for those who plan to use this module in their own projects.

The @xpack/update-checker module can be imported into both TypeScript and JavaScript ES6 Node.js code with:

import { UpdateChecker } from '@xpack/update-checker'

Note: as per the ES6 specs, importing ES6 modules in legacy CommonJS modules is no longer possible.

The module can be included in any application and the class can be used directly or as a base class for a derived class to implement a custom behaviour (like a custom notifier).

A typical use case is as part of a CLI application.

Example:

import { UpdateChecker } from '@xpack/update-checker'
import { Logger } from '@xpack/logger'

async main(argv) {
  const log = new Logger({ level: 'info' })

  // ... Other initializations.

  // Read in the current package JSON (bring your own function here).
  const packageJson = await readPackageJson()

  // Create on instance of notifier class, configured for the
  // current package.
  const updateChecker = new UpdateChecker({
    log: log,
    packageName: packageJson.name,
    packageVersion: packageJson.version
  })

  // Start the update checker, as an asynchronous function
  // running in parallel.
  await updateChecker.initiateVersionRetrieval()

  // ... Perform the application actual work.

  // Before returning, possibly send a notification to the console.
  await updateChecker.notifyIfUpdateIsAvailable()

  return exitCode
}

The check is no longer performed during the next 24 hours; this duration can be configured via the checkUpdatesIntervalSeconds constructor property.

The check is skipped if one of the following conditions are met:

• running in a CI environment
• stdout is not a TTY
• the process is running as root
• the program is installed in system locations
• the NO_<packageName>_UPDATE_NOTIFIER variable is present in the environment map (configurable)

For more details on the available class definitions, including all methods, accessors, properties, etc, please see the TypeDoc reference pages.

• none

The @xpack/update-checker module is fully functional and stable.

The main client for this module is the xpm CLI application.

The module is tested with 100% coverage and CI tested on every push via GitHub Actions.

According to semver rules:

Major version X (X.y.z | X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API.

The project was migrated to TypeScript and the code is now compiled into ES6 modules, that can be consumed by both TypeScript and JavaScript packages. The minimum node engine was updated to >16.0.0.

Other changes:

• the test environment was moved outside the constructor
• the parameter of sendNotification() was removed in favour of the instance property
• the name of the environment variable was added to the constructor

The original content is released under the MIT License, with all rights reserved to Liviu Ionescu.