@aikidosec/firewall/helpers/isESM.js

Zen by Aikido is an embedded Application Firewall that autonomously protects Node.js apps against common and critical attacks, provides rate limiting, detects malicious traffic (including bots), and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isESM = isESM;
const isPreloaded_1 = require("./isPreloaded");
/**
 * Checks at runtime if the Node.js application is using ESM.
 */
function isESM() {
    // This should normally not happen because our library is currently distributed as CommonJS
    // But to be safe against strange edge cases and future changes, we check if require is undefined, which would indicate we're in ESM mode.
    if (typeof require === "undefined") {
        // If require is undefined, we're definitely in ESM mode
        return true;
    }
    if ((0, isPreloaded_1.isPreloaded)()) {
        // If the library is preloaded (e.g. --require), we can't reliably determine if we're in ESM mode or not,
        // because require.main will be undefined in both cases (ESM or CommonJS), so we return undefined to indicate that we can't determine the module system.
        return undefined;
    }
    // require.main represents the entry script loaded when the Node.js process launched, or undefined if the entry point of the program is not a CommonJS module.
    // It can only be used in CommonJS modules, but our library is currently distributed as CommonJS, so this check is safe to use.
    return (require === null || require === void 0 ? void 0 : require.main) === undefined;
}