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

$3

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 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:

`shell
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"
`

$3

`javascript
isPackageChanged(
options?: PackageChangedOptions,
callback?: (result: PackageChangedCallbackResult) => Promise,
): Promise;
`

#### Example usage
`javascript
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. |