Vue.js: check if a component exists

Question

I need to do some stuff in the ready: of the root instance only when some components don\'t exist (they weren\'t declared in the HTML).

How can I check if a

Answer 1

To check if a global component exists:

let componentExists = 'componentName' in Vue.options.components

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To check if a imported component exists in a component:

let componentExists = 'componentName' in this.$options.components