React createContext issue in Typescript?

Posted by Jessica Taylor | Updated on | Typescript


React createContext issue in Typescript? The SidebarProps represent the context’s state. Everything else, besides the reducer actions, can essentially be used as is.

How to implement class constants in typescript?

Posted by Editorial Staff | Updated on | Typescript


Want to implement class constants in typescript? TypeScript 2.0 has the readonly modifier: It’s not exactly a constant because it allows assignment in the constructor, but that’s most likely not a big deal. Alternative Solution …

How to set navigationOptions on stateless component with Typescript?

Posted by Editorial Staff | Updated on | Typescript


If you want to set navigationOptions on stateless component with Typescript? The key idea is to specify correct type for Example constant. Probably, react-navigation already provides that type. But, you can also extend build-in React …

How to declare defaultProps on a React component class using TypeScript?

Posted by Jennifer | Updated on | Typescript


Want to declare defaultProps on a React component class using TypeScript? You can define default props this way: This is equivalent in TypeScript to defining defaultProps as a static field inside the class body:

How to use children with React Stateless Functional Component in TypeScript?

Posted by Jessica Taylor | Updated on | Typescript


Want to use children with React Stateless Functional Component in TypeScript? React 16.8 Update: Since React 16.8, the names React.SFC and React.StatelessComponent are deprecated. Actually, they have become aliases for React.FunctionComponent type or React.FC for …

How to define optional constructor arguments with defaults in Typescript?

Posted by Rohit Kumar | Updated on | Typescript


Want to define optional constructor arguments with defaults in Typescript? Default-initialized parameters that come after all required parameters are treated as optional, and just like optional parameters, can be omitted when calling their respective function. …

Specifying onClick event type with Typescript and React.Konva

Posted by Prem Tiwari | Updated on | Typescript


Specifying onClick event type with Typescript and React.Konva. As posted in my update above, a potential solution would be to use Declaration Merging as suggested by @Tyler-sebastion. I was able to define two additional interfaces …

String.Format not work in TypeScript

Posted by Jessica Taylor | Updated on | Typescript


String.Format not work in TypeScript. You can declare it yourself quite easily. This is assuming that String.format is defined elsewhere. e.g. in Microsoft Ajax Toolkit.

How to get height and width of device display in angular2 using typescript?

Posted by Jessica Taylor | Updated on | Typescript


If you want to get height and width of device display in angular2 using typescript? I found the solution. The answer is very simple. write the below code in your constructor. Working Code Another

Extending functionality in TypeScript

Posted by Jessica Taylor | Updated on | Typescript


Extending functionality in TypeScript. I have found the solution. It takes a combination of the interface and the JavaScript implementation. The interface provides the contract for TypeScript, allowing visibility of the new method. The JavaScript …

What is the difference between never and void in typescript?

Posted by Editorial Staff | Updated on | Typescript


In this example, We have shared what is the difference between never and void in typescript? In imperative languages, void can be thought of as a type containing a single value. Such languages do not …

Iterate over array of objects in Typescript

Posted by Jessica Taylor | Updated on | Typescript


Iterate over array of objects in Typescript. You can use the built-in forEach function for arrays. Use the below Typescript example: Your version wasn’t wrong though. It should look more like this:

Extending TypeScript Global object in node.js

Posted by Pinki | Updated on | NodeJS Typescript


Extending TypeScript Global object in node.js. The TypeScript compiler doesn’t like this because the Global type has no object named myConfig. You probably have something like vendor.d.ts: Your file needs to be clean of any …

How to compare Enums in TypeScript?

Posted by Jessica Taylor | Updated on | Typescript


Want to compare Enums in TypeScript? There is another way: if you don’t want generated javascript code to be affected in any way, you can use type cast: In general, this is caused by control-flow …

How to get around property does not exist on ‘Object’

Posted by Ramesh Singh | Updated on | Typescript


Want to get around property does not exist on ‘Object’? If you use the any type instead of Object, you can access any property without compile errors. However, I would advise to create an interface …