@wordpress/eslint-plugin/utils/is-package-installed.js

ESLint plugin for WordPress development.

/**
 * Checks whether the passed package name is installed in the project.
 *
 * @param {string} packageName The name of npm package.
 * @return {boolean} Returns true when the package is installed or false otherwise.
 */
const isPackageInstalled = ( packageName ) => {
	try {
		if ( require.resolve( packageName ) ) {
			return true;
		}
	} catch {}
	return false;
};

module.exports = isPackageInstalled;