Taobao Frontend Technology
Feb 9, 2023 · Fundamentals
How AsyncContext Enables Seamless Data Propagation Across JavaScript Async Calls
The article introduces the TC39 Async Context proposal, explains why asynchronous context is needed, shows a library implementation using run and log functions, describes the AsyncContext API with run, get, and wrap methods, and explores use cases such as trace propagation, task‑priority handling, and comparisons with thread‑local storage and Node.js AsyncLocalStorage.
AsyncContextAsyncLocalStorageJavaScript
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