Wk-notes-11-21-Add-Typescript

Attempt to add typescript progressively into a js project

• Add .d.ts, in the js file, using @typedef and JSDoc import to refer to the interface/type you defined

/** @typedef {import('./index').InitialState} InitialState */
/** @typedef {import('./index').Props} Props */

• Use @extends to infer a class, and now you have the type for props and state

/** @extends {PureComponent<Props,InitialState>} */
/** @extends {Component<Props,InitialState>} */