45 lines
1.2 KiB
Markdown
45 lines
1.2 KiB
Markdown
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---
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sidebar_position: 1
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sidebar_label: Pre Registration
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---
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# Lifecylce Hook: preRegistration
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If an extension defines the `preRegistration` lifecycle hook, it is called
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before any modules are registered in the `ExtensionManager`. This hook can be
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used to:
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- initialize 3rd party libraries
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- register event listeners
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- add or call services
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- add or call commands
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The `preRegistration` hook receives an object containing the
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`ExtensionManager`'s associated `ServicesManager`, `CommandsManager`, and any
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`configuration` that was provided with the extension at time of registration.
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_Example `preRegistration` hook implementation_
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```js
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export default {
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id: 'MyExampleExtension',
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/**
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* @param {object} params
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* @param {object} params.configuration
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* @param {ServicesManager} params.servicesManager
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* @param {CommandsManager} params.commandsManager
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* @returns void
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*/
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preRegistration({ servicesManager, commandsManager, configuration }) {
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console.log('Wiring up important stuff.');
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window.importantStuff = () => {
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console.log(configuration);
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};
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console.log('Important stuff has been wired.');
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window.importantStuff();
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},
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};
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```
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