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CommonJS is tracking ES5. For the time being, we vaguely suggest that all compliant implementations must support all features of ES5 that are implementable or
by kriskowal 17y ago
CommonJS is tracking ES5. For the time being, we vaguely suggest that all compliant implementations must support all features of ES5 that are implementable or stubbable with existing JavaScript features. For example, Object.freeze can be implemented as a stub no-op so people are free to use the API in their modules, and get the feature when it's supported. The intent is to eventually make ES5 compliance a requirement.