steal-tools/lib/bundle/add_npm_packages_node.js

var prettier = require("prettier");

/**
 * Adds node to bundle to preload npm packages for dev bundles
 *
 * @param {{}} bundle The bundle to be mutated
 * @param {{}} npmContext The context containing the npm packages loaded
 */
module.exports = function(bundle, npmContext) {
	var push = [].push;
	push.apply(bundle.nodes, [makeAddNpmPackagesNode(npmContext)]);
};

function makeAddNpmPackagesNode(npmContext) {
	var packages = npmContext.packages || [];

	return {
		deps: [],
		load: {
			name: "[steal-add-npm-packages]",
			metadata: {
				format: "global"
			},
			source: prettier.format(
				`if (steal && typeof steal.addNpmPackages === "function") {
					steal.addNpmPackages(${JSON.stringify(packages)});
				}`,
				{ tabWidth: 4 }
			)
		}
	};
}