dev_054 questions

• What's the proper way to check if a constant is defined?
• Active Model Serializers has_many associations
• How to access a static variable from a generic class?
• Destructuring assignment in Typescript for global variables
• Type 'Observable<Response | Observable<Response>>' is not assignable to type 'Observable<Response>'
• Angular - Uniqueness validator in FormArray
• How to display a value and keep another value in my FormControl?
• Using responders gem with Rails 5
• ReferenceError: customElements is not defined
• Restrict routes using custom matcher

dev_054 answers