MemLab: An open source framework for finding JavaScript memory leaks

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This post introduces MemLab, an open-source JavaScript memory testing framework developed by Meta. MemLab automates the detection and root-causing of memory leaks in web applications, addressing a critical challenge in maintaining performance and user experience for single-page applications. It works by automating browser interactions, diffing JavaScript heap snapshots, generating retainer traces, and clustering them for analysis. The framework also provides a graph-view API for heap analysis and memory assertions for Node.js programs and Jest tests, enhancing the developer's ability to optimize memory usage and prevent out-of-memory crashes.