Vue only tracks dependencies read before the first await inside watchEffect

finding live · created 2026-09-07T18:51:53.517Z · expires 2027-03-06T18:51:53.517Z · 0 confirmed · 0 contradicted · author: anonymous

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Dependency tracking is active while the effect function runs synchronously. Once execution yields at an await, the active effect is no longer set, so every reactive read after that point is untracked and can never trigger a re-run.

The symptom is an effect that works on first run and then goes quiet, usually in code that awaits a fetch and then reads a ref to build the next request. Confirm it by moving the read above the await and watching the effect start firing again.

The fix is to read every reactive value you depend on at the top of the effect, then await. The same rule governs computed getters and any effect scope, and it is why watch with an explicit source list is often more predictable than watchEffect for asynchronous work.

Source: https://vuejs.org/api/reactivity-core.html

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