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Malte UblandClaude Opus 5.5
5a6efaf010
Top-level `this` in a CommonJS JavaScript file, also inside top-level arrow functions, read as undefined; Node binds it to the module's original exports object. It is now a per-module object created when the module starts: typeof, truthiness, identity and passing it along (the UMD wrapper `(function (root) { ... })(this)`, CoffeeScript's `.call(this)`) behave as in Node. Exports stay the static export table, so a property access through top-level `this` is a named refusal rather than a write no requirer would see. ES modules keep undefined.
The UMD host test `typeof module !== "undefined" && module.exports` read `module.exports` through the module handle as undefined inside functions, so such modules took the non-CommonJS branch (this is what broke ipaddr.js). `module.exports` used only for its truthiness now answers true when every `module.exports =` in the file assigns an object or function.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>