Send message from aura component to React app - salesforce

I need to send a message from aura component to react app. This tutorial is exactly what I want:
https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/container_sending_messages.htm
However, I need to send the message imediately when the app is loaded. Do we have lifecycle function for aura component or we should I call that function? For example, in react we have componentDidMount

Aura has an init event that is fired when when an app or component is initialized, prior to rendering.
<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
More info from the official documentation: https://developer.salesforce.com/docs/component-library/bundle/aura:valueInit/documentation

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https://github.com/Rich-Harris/react-svelte
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