[Solved] How to use virtual-dom's "h" helper in <head> for header-dropdown hamburger widget override? + How to override @computed method?

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Awesome, this worked really well!

Here is the snippet for the composer window’s categoryValidation override, if anyone stumble here using the search.

<script type="text/discourse-plugin" version="0.8.23">
const computed = require("ember-addons/ember-computed-decorators").default;
api.modifyClass('controller:composer', {
    @computed("model.categoryId", "lastValidatedAt")
    categoryValidation(categoryId, lastValidatedAt) {
        var InputValidation = require("discourse/models/input-validation").default;
        var categoryDepth = /*Find categoryId's category level*/;
        if(this.get('model').draftKey == "new_topic" && (categoryDepth !== 0 && categoryDepth < 2)) {
            return InputValidation.create({
                failed: true,
                reason: 'You need to select a subcategory',
                lastShownAt: lastValidatedAt
              }); //THIS WORKS AND DISPLAY AN CUSTOM ERROR MESSAGE
        } else {
            return this._super(categoryId, lastValidatedAt);
        }
    }
});
</script>