server/utils/module.ts

import { fileURLToPath } from "node:url";

/**
 * Determines whether a module is the entry point for the running node process.
 * This works for both CommonJS and ES6 environments.
 *
 * ### CommonJS
 * ```js
 * if (moduleIsEntry(module)) {
 *     console.log('WOO HOO!!!');
 * }
 * ```
 *
 * ### ES6
 * ```js
 * if (moduleIsEntry(import.meta.url)) {
 *     console.log('WOO HOO!!!');
 * }
 * ```
 */
export const moduleIsEntry = (moduleOrImportMetaUrl: NodeModule | string) => {
    if (typeof moduleOrImportMetaUrl === "string") {
        return process.argv[1] === fileURLToPath(moduleOrImportMetaUrl);
    }

    if (typeof require !== "undefined" && "exports" in moduleOrImportMetaUrl) {
        return require.main === moduleOrImportMetaUrl;
    }

    return false;
};