README.md

package-changed

This package is a quick and easy way of figuring out whether or not package.json has been modified.

It contains mainly code extracted from install-changed.

install-changed will run npm install when dependencies have changed. package-changed also provides this functionality. However, it does give you more control on what should happen when dependencies in your package.json file have changed.

Install

You can find this package on npm and can install it with:

npm install package-changed

However, you can use it without having to install it using npx:

npx package-changed

Documentation

CLI

Use package-changed simply by running following from your project root:

npx package-changed

This is, in fact, a shorthand for the following commands:

npx package-changed run "npm install"

or if you have an environmental variable CI with value set to true then it will run:

npx package-changed run "npm ci"

However, using the run command you can specify any command which you want to run in case your dependencies have changed since the last run.

npx package-changed run "echo 'Run any command when your package has changed'"

All CLI options

package-changed

Options:
  --cwd [cwd]                 Current working directory.
  --hash-filename [filename]  Filename where hash of dependencies will be written to
  --lockfile                  Include package versions from package-lock.json in hash
  --no-hash-file              Skip writing new hash to .packagehash file
  -h, --help                  display help for command

Commands:
  run [command]
  install [options]
  help [command]              display help for command

package-changed install

Usage: package-changed install [options]

Options:
  --ci        Run 'npm ci' instead of 'npm i'. Even when package is not changed. Default when env.CI=true
  -r, --registry <registry>  npm registry url to use
  -h, --help  display help for command

package-changed run

Usage: package-changed run [options] [command]

Options:
  -h, --help  display help for command

Use git hooks to run package-changed automatically

package-changed can be run automatically with git hooks, for example: when switching branches. Husky is a popular choice for configuring git hooks.

With Husky installed:

npx husky add .husky/post-checkout "npx --no package-changed"
npx husky add .husky/post-merge "npx --no package-changed"
npx husky add .husky/post-rebase "npx --no package-changed"

Javascript API

isPackageChanged(
  options?: PackageChangedOptions,
  callback?: (result: PackageChangedCallbackResult) => Promise<boolean>,
): Promise<PackageChangedResult>;

Example usage

const {
  isPackageChanged
} = require('package-changed')

// run with default options
const {
  isChanged,
} = isPackageChanged();

// or run with custom options
const {
  isChanged,
  writeHash,
} = await isPackageChanged({
  hashFilename: '.packagehash',
});

if (isChanged) {
  // dependencies in your package.json have changed since last run
  ...
  // call writeHash to write the latest package hash to your disk
  writeHash();
}

// or use the callback argument
isPackageChanged(
  undefined, // using default options
  ({isChanged}) => {
    // ...

    return true; // or false if you don't want the hash to be written
  },
);

PackageChangedOptions

Property	Type	Description	Required	Default
cwd	string	Current working directory	false	process.cwd()
hashFilename	string	Filename where hash of dependencies will be written to.	false	'.packagehash'
lockfile	boolean	Include package-lock.json content in hash.	false	false
noHashFile	boolean	Skip writing new hash to .packagehash file.	false	false

PackageChangedCallbackResult

Property	Type	Description
isChanged	boolean	Filename where hash of dependencies will be written to.
hash	string	The hash for the current listed dependencies in package.json
oldHash	string | undefined	The hash used to compare newHash with. undefined if no previous hash was found.

PackageChangedResult

Property	Type	Description
isChanged	boolean	Filename where hash of dependencies will be written to.
hash	string	The hash for the current listed dependencies in package.json
oldHash	string | undefined	The hash used to compare newHash with. undefined if no previous hash was found.
writeHash	function	Function which needs to be called after the cache has been succesfully restored.