![]() ![]() Their names make it clearer when npm runs them. Note that we can also create a pre script "preinstall" and/or a post script "postinstall"."install" runs when npm install is used without arguments or when a package is installed globally."prepublishOnly" only runs during npm publish."prepack" runs before a package archive (a.Runs when npm install is used without arguments or when a package is installed globally.Runs when a package is installed from git or a local path.These are the most important life cycle scripts (for detailed information on all life cycle scripts, see the npm documentation): If the tests fail, the package won’t be published. Running tests: We can also use a life cycle script to run tests before publishing a package. It also ensures that our TypeScript code has no static type errors because compilation (and therefore publishing) stops when those are encountered. That ensures that in the npm registry, the JavaScript code is always in sync with our TypeScript code. A life cycle script lets us compile the TypeScript code before npm publish uploads the package. While the latter code is often not checked into version control, it has to be uploaded to the npm registry, so that the package can be used from JavaScript. What are use cases for life cycle scripts?Ĭompiling TypeScript: If a package contains TypeScript code, we normally compile it to JavaScript code before we use it. If any of the life cycle scripts fail, the whole command stops immediately with an error. npm install (which is used without arguments to install dependencies for packages that were downloaded from sources other than the npm registry).npm pack (which creates archives for registry packages, package directories, etc.).npm publish (which uploads packages to the npm registry).Npm runs life cycle scripts during npm commands such as: This is what happens if we run hello: % npm -s run hello Npm package scripts are defined via property "scripts" of package.json: This chapter explains them and how we can write them so that they work on both Windows and Unixes (macOS, Linux, etc.). Package.json has the property "scripts" which lets us define package scripts, small shell scripts that perform package-related tasks such as compiling artifacts or running tests. 15.9.2 Defining operating-system-specific scripts.15.9.1 per-env: switching between scripts, depending on $NODE_ENV.15.9 Expanding the capabilities of package scripts. ![]()
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