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Update lifecycle onMount docs #8594

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Update lifecycle onMount docs #8594

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2 changes: 1 addition & 1 deletion site/content/tutorial/07-lifecycle/01-onmount/text.md
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Expand Up @@ -25,4 +25,4 @@ We'll add an `onMount` handler that loads some data over the network:

Lifecycle functions must be called while the component is initialising so that the callback is bound to the component instance — not (say) in a `setTimeout`.

If the `onMount` callback returns a function, that function will be called when the component is destroyed.
If the `onMount` callback returns a function synchronously, that function will be called when the component is destroyed. Note however that an `async` callback can't return a function, but only a `Promise` of a function, which will not be called automatically in `onDestroy`.