Harper v5.0's Upgraded JavaScript Environment
Blog post from Harper
Harper v5.0 introduces a revamped JavaScript execution environment that enhances both application-specific contexts and platform security. The update replaces the previous global execution context with Node.js's vm.SourceTextModule API, allowing each application to have its own isolated module graph and context. This separation improves security by mitigating risks like prototype pollution through freezing JavaScript intrinsics and controlling process spawning with an explicit allowlist. Additionally, it restricts unauthorized file access and limits the use of Node.js built-in modules through a specified allowlist. For compatibility, applications can revert to the old native module loader if necessary during migration. These changes address growing concerns over supply chain attacks within the npm ecosystem, aiming to protect against malicious packages and compromised dependencies while maintaining the full capability of Node.js. For enhanced isolation, Harper provides the option of using SES compartments for strict security needs, and the platform's infrastructure further supports security through Docker-based tenant separation.
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