Ghost/ghost/admin/app/components/gh-psm-template-select.hbs

{{#if this.customTemplates}}
    <div class="form-group for-select" data-test-custom-template-form>
        <label for="author-list">Template</label>
        <span class="gh-select {{if this.matchedSlugTemplate "disabled"}}">
            <OneWaySelect @value={{this.selectedTemplate}}
                @options={{this.customTemplates}}
                @optionValuePath="filename"
                @optionLabelPath="name"
                @update={{action "selectTemplate"}}
                @disabled={{this.matchedSlugTemplate}}
                data-test-select="custom-template" />
            {{svg-jar "arrow-down-small"}}
        </span>
        {{#if this.matchedSlugTemplate}}
            <p>Post URL matches {{this.matchedSlugTemplate.filename}}</p>
        {{/if}}
    </div>
{{/if}}