How to check if a Meteor package is currently installed?

Question

I need to check if the package my-package:notification is installed in my app.

Only then another template is used (which is part of this package).

Something like this:

<template name="example">
    {{#if hasNotificationPackage}}
        {{>notification}}
    {{/if}}
</template>

How do I do that?

Answer 1

Meteor provides a global object called Package that contains all of the Meteor package exports.

Therefore, you can use something like

Template.example.helpers({
  hasNotificationPackage() {
    return (typeof Package['my-package:notification'] === 'object');
  }
});

I am not sure that depending on the availability of a package this way is something that should be used often, especially in production.