Jakub questions

• How to use intl.formatRelativeTime() in the correct way
• AngularJS: RangeError: Invalid time value at Date.toISOString (<anonymous>)
• JS: [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience [duplicate]
• Gem install ffi Failed to build gem native extension
• What is the meaning of this error "Declaration of instance field not allowed after declaration of instance method."

Jakub answers