happy-dom/lib/module/ModuleURLUtility.js

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.

import { URL } from 'url';
import * as PropertySymbol from '../PropertySymbol.js';
/**
 * Module URL utility.
 */
export default class ModuleURLUtility {
    /**
     * Returns module URL based on parent URL and the import map.
     *
     * @param window Window.
     * @param parentURL Parent URL.
     * @param url Module URL.
     */
    static getURL(window, parentURL, url) {
        const parentURLString = typeof parentURL === 'string' ? parentURL : parentURL.href;
        const importMap = window[PropertySymbol.moduleImportMap];
        if (!importMap) {
            return new URL(url, parentURLString);
        }
        if (importMap.scopes.length) {
            for (const scope of importMap.scopes) {
                if (parentURLString.includes(scope.scope)) {
                    for (const rule of scope.rules) {
                        if (url.startsWith(rule.from)) {
                            return new URL(rule.to + url.replace(rule.from, ''), parentURLString);
                        }
                    }
                }
            }
        }
        if (importMap.imports.length) {
            for (const rule of importMap.imports) {
                if (url.startsWith(rule.from)) {
                    return new URL(rule.to + url.replace(rule.from, ''), parentURLString);
                }
            }
        }
        return new URL(url, parentURLString);
    }
}
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