docs: add jsdocs for types

Author: devrnt

src/types.ts

@@ -1,16 +1,35 @@
 export type Handler = (() => Promise<void>) | (() => void) | null;
 
 export type WizardProps = {
+  /** Optional header that is shown above the active step */
   header?: React.ReactNode;
+  /** Optional footer that is shown below the active step */
   footer?: React.ReactNode;
 };
 
 export type WizardValues = {
+  /** Go to the next step */
   nextStep: () => Promise<void>;
+  /** Go to the previous step */
   previousStep: () => void;
+  /**
+   * Connect a callback that will be called when calling `nextStep()`
+   *
+   * @param handler Can be either sync or async
+   *
+   */
   handleStep: (handler: Handler) => void;
+  /**
+   * Indicate the current state of the handler
+   *
+   * Will reflect the handler promise state: will be `true` if the handler promise is pending and
+   * `false` when the handler is either fulfilled or rejected
+   */
   isLoading: boolean;
+  /** The urrent active step of the wizard */
   activeStep: number;
+  /** Indicate if the current step is the first step (aka no previous step) */
   isFirstStep: boolean;
+  /** Indicate if the current step is the last step (aka no next step) */
   isLastStep: boolean;
 } | null;