loaderOptionsPlugin.ts

import isEmpty = require("lodash/isEmpty");

import {
	createOrUpdatePluginByName,
	findPluginsByName,
	safeTraverse,
} from "@webpack-cli/utils/ast-utils";

import { IJSCodeshift, INode } from "../types/NodePath";

interface ILoaderOptions {
	debug?: boolean;
	minimize?: boolean;
}

/**
 *
 * Transform which adds context information for old loaders by injecting a `LoaderOptionsPlugin`
 *
 * @param {Object} j - jscodeshift top-level import
 * @param {Node} ast - jscodeshift ast to transform
 * @returns {Node} ast - jscodeshift ast
 *
 */

export default function(j: IJSCodeshift, ast: INode): INode {
	const loaderOptions: ILoaderOptions = {};

	// If there is debug: true, set debug: true in the plugin
	if (ast.find(j.Identifier, { name: "debug" }).size()) {
		loaderOptions.debug = true;

		ast
			.find(j.Identifier, { name: "debug" })
			.forEach((p: INode): void => {
				p.parent.prune();
			});
	}

	// If there is UglifyJsPlugin, set minimize: true
	if (findPluginsByName(j, ast, ["webpack.optimize.UglifyJsPlugin"]).size()) {
		loaderOptions.minimize = true;
	}

	return ast
		.find(j.ArrayExpression)
		.filter(
			(path: INode): boolean =>
				safeTraverse(path, ["parent", "value", "key", "name"]) === "plugins",
		)
		.forEach((path: INode): void => {
			if (!isEmpty(loaderOptions)) {
				createOrUpdatePluginByName(
					j,
					path,
					"webpack.LoaderOptionsPlugin",
					loaderOptions,
				);
			}
		});
}