How come I am able to utilize import declarations in libraries that exclusively cater to CommonJS modules?

Ua-parser-js currently only supports the CommonJS module structure. However, when attempting to export it, the export statement is not present:

    if (typeof(exports) !== UNDEF_TYPE) {
        // nodejs environment
        if (typeof module !== UNDEF_TYPE && module.exports) {
            exports = module.exports = UAParser;
        }
        exports.UAParser = UAParser;
    } else {
        // requirejs environment (if needed)
        if (typeof(define) === FUNC_TYPE && define.amd) {
            define(function () {
                return UAParser;
            });
        } else if (typeof window !== UNDEF_TYPE) {
            // browser environment
            window.UAParser = UAParser;
        }
    }

Despite this limitation, why am I able to import UAParser using

import { UAParser } from 'ua-parser-js'
? This discrepancy was highlighted in the following Stack Overflow answer and GitHub issue:

https://github.com/faisalman/ua-parser-js/issues/423

Answer №1

There are a couple of ways this scenario could unfold:

  • Your toolchain may transform the
    import { UAParser } from 'ua-parser-js'
    statement into
    const { UAParser } = require('ua-parser-js');
    , which is then executed by node
  • Node's ESM does provide support for importing CommonJS modules for compatibility. The module.exports = UAParser; will be available as the default import, while exports.UAParser = UAParser; can be accessed as a named import.

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