nx/docs/generated/devkit/ensurePackage.md

Function: ensurePackage

▸ ensurePackage(tree, pkg, requiredVersion, options?): void

Parameters

Name	Type	Description
tree	Tree	the file system tree
pkg	string	the package to check (e.g. @nx/jest)
requiredVersion	string	the version or semver range to check (e.g. ~1.0.0, >=1.0.0 <2.0.0)
options?	Object	-
options.dev?	boolean	-
options.throwOnMissing?	boolean	-

Returns

void

Deprecated

Use the other function signature without a Tree

Use a package that has not been installed as a dependency.

For example:

ensurePackage(tree, '@nx/jest', nxVersion);

This install the @nx/jest@ and return the module When running with --dryRun, the function will throw when dependencies are missing. Returns null for ESM dependencies. Import them with a dynamic import instead.

▸ ensurePackage<T>(pkg, version): T

Ensure that dependencies and devDependencies from package.json are installed at the required versions. Returns null for ESM dependencies. Import them with a dynamic import instead.

For example:

ensurePackage('@nx/jest', nxVersion);

Type parameters

Name	Type
T	extends unknown = any

Parameters

Name	Type	Description
pkg	string	the package to install and require
version	string	the version to install if the package doesn't exist already

Returns

T