change instance variable to local variable in helper

app/helpers/enterprise_helper.rb

@@ -5,11 +5,11 @@ module EnterpriseHelper
   end
 
   def write_trial_key_to_gon
-    @trial_key = Token::EnterpriseTrialKey.find_by(user_id: User.system.id)
-    if @trial_key
+    trial_key = Token::EnterpriseTrialKey.find_by(user_id: User.system.id)
+    if trial_key
       gon.ee_trial_key = {
-        value: @trial_key.value,
-        created: @trial_key.created_at
+        value: trial_key.value,
+        created: trial_key.created_at
       }
     end
   end

frontend/src/app/features/enterprise/enterprise-modal/enterprise-trial.modal.ts

@@ -114,7 +114,7 @@ export class EnterpriseTrialModalComponent extends OpModalComponent implements A
     if (this.eeTrialService.trialStarted || this.eeTrialService.confirmed) {
       window.location.reload();
     }
-    else if(this.eeTrialService.mailSubmitted) {
+    else if (this.eeTrialService.mailSubmitted) {
       window.location.reload();
       return;
     }

frontend/src/app/features/enterprise/free-trial-button/free-trial-button.component.html

@@ -1,4 +1,4 @@
-<div [attr.data-tooltip]="text.confirmation_info(created, email)" [ngClass]="{'tooltip--top': trialRequested}">
+<div [attr.data-tooltip]="trialRequested ? text.confirmation_info(created, email) : ''" [ngClass]="{'tooltip--top': trialRequested}">
   <button [disabled]="trialRequested" class="button -alt-highlight -round" (click)="openTrialModal()">
     {{ text.button_trial }}
   </button>

frontend/src/app/features/enterprise/free-trial-button/free-trial-button.component.ts

@@ -39,7 +39,7 @@ import { OpModalService } from 'core-app/shared/components/modal/modal.service';
 import { EnterpriseTrialService } from 'core-app/features/enterprise/enterprise-trial.service';
 import { TimezoneService } from 'core-app/core/datetime/timezone.service';
 import { distinctUntilChanged } from 'rxjs/operators';
-import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { HttpClient } from '@angular/common/http';
 import { GonService } from 'core-app/core/gon/gon.service';
 
 export const freeTrialButtonSelector = 'free-trial-button';
@@ -56,11 +56,10 @@ export class FreeTrialButtonComponent implements OnInit {
 
   public text = {
     button_trial: this.I18n.t('js.admin.enterprise.upsale.button_start_trial'),
-    confirmation_info: (date:string, email:string) =>
-      this.trialRequested ? this.I18n.t('js.admin.enterprise.trial.confirmation_info', {
+    confirmation_info: (date:string, email:string) => this.I18n.t('js.admin.enterprise.trial.confirmation_info', {
       date,
       email,
-    }) : '',
+    }),
   };
 
   constructor(protected I18n:I18nService,
@@ -122,7 +121,7 @@ export class FreeTrialButtonComponent implements OnInit {
     this.opModalService.show(EnterpriseTrialModalComponent, this.injector);
   }
 
-  public get trialRequested() {
+  public get trialRequested(): boolean {
     const eeTrialKey = this.Gon.get('ee_trial_key') as any;
     return (eeTrialKey && eeTrialKey !== undefined);
   }