Q141. How do you receive server-sent event notifications?
The EventSource object is used to receive server-sent event notifications. For example, you can receive messages from server as below, ```javascript if (typeof EventSourc...
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Q142. What is React Strict Mode in Next.js?
A development mode only feature for highlighting potential problems in an application. It helps to identify unsafe lifecycles, legacy API usage, and a number of other fea...
Q143. How do you check browser support for server-sent events?
You can perform browser support for server-sent events before using it as below, ```javascript if (typeof EventSource !== "undefined") { // Server-sent events supported. ...
Q144. What is a singleton router in Next.js?
In Next.js Pages Router, the **Singleton Router** refers to the global, shared router instance exported by `next/router`: ```javascript import Router from 'next/router'; ...
Q145. What are the events available for server sent events?
Below are the list of events available for server sent events | Event | Description | |---- | --------- | onopen | It is used when a connection to the server is opened | ...
Q146. How to use React label element?
If you try to render a `` element bound to a text input using the standard `for` attribute, then it produces HTML missing that attribute and prints a warning to the conso...
Q147. What is next/script used for?
The `next/script` component is used to load external scripts in a Next.js application. It provides features like loading scripts asynchronously, deferring execution, and ...
Q148. What are the main rules of promise?
A promise must follow a specific set of rules: 1. A promise is an object that supplies a standard-compliant `.then()` method 2. A pending promise may transition into eith...
Q149. How to combine multiple inline style objects?
You can use _spread operator_ in regular React: ```jsx harmony {"Submit"} ``` If you're using React Native then you can use the array notation: ```jsx harmony {"Submit"} ...
Q150. What is middleware?
Middleware allows you to run code before a request is completed. Then, based on the incoming request, you can modify the response by rewriting, redirecting, modifying the...