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TypeScript News Monday, March 5 State management pattern, Predictable state mutations, Type inference & more…

TypeScript News TLDR / Table of Contents

  • For this store, we will define the following: – – In the above events, we have which has payload for it.
  • You can optionally include a type if you want to make the event more descriptive, that looks like this: – – Next lets define a store class.
  • The decorator accepts a few different options: – – So here is our basic store: – – because I didn’t pass a name, it will use the name .
  • The above mutation listens for the event to be dispatched and then updates the flag in our store.
  • Thats super easy, since its just another mutation that adds our animal to the store: – – So we’ve covered what our store looks like, but how do we trigger these events?

Tags: state management pattern, predictable state mutations, modern TypeScript language, store, event

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Tags: type inference, generic type inference, const arr, const arr1, const identity

  • Lets implement a Toggleable component with render props functionality: – – Toggleable component with RenderProps/Children as a functionpattern – Huh quite loot is happening in thereright?Lets take a closer look to each important part of our implementation:const initialState = { show: false } – type State = Readonlytypeof initialStatehere we…
  • children : null} – / – )With that we can refactor our ToggleableMenu with render prop to: – type Props = { title: string } – const ToggleableMenu: SFCProps = ({ title, children }) = ( – Toggleable – render={({ show, toggle }) = ( – MenuItem show={show} toggle={toggle} title={title}…
  • It is defined as index type with any type, so we are loosing here strict type safety…// We need create defaultProps with our arbitrary prop type – props which is gonna be empty object by default – const defaultProps = { props: {} as { [name: string]: any } }…
  • children(renderProps) : null – }Whole implementation of Toogleable component with Render Props, Children as a Function, Component Injection with arbitrary props support: – – Whole implementation of Toogleable component with Render Props, Children as a Function, Component Injection with arbitrary propssupport – Our final component which leverages component prop looks…
  • Bad news, we cantโ€ฆ – We need to introduce ofType generic component factory pattern – export class ToggleableT extends object = object extends ComponentPropsT, State { – static ofTypeT extends object() { – return Toggleable as ConstructorToggleableT – } – }Whole implementation of Toogleable component with Render Props, Children as…

Tags: component, react component patterns, typescript, type, props

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