ionic-framework/packages/vue/src/components/IonBackButton.ts

import { defineCustomElement } from "@ionic/core/components/ion-back-button.js";
import { h, inject, defineComponent } from "vue";

export const IonBackButton = /*@__PURE__*/ defineComponent(
  (_, { attrs, slots }) => {
    defineCustomElement();

    // TODO(FW-2969): type
    const ionRouter: any = inject("navManager");

    const onClick = () => {
      /**
       * When using ion-back-button outside of
       * a routing context, ionRouter is undefined.
       */
      if (ionRouter === undefined) {
        return;
      }

      const defaultHref = attrs["default-href"] || attrs["defaultHref"];
      const routerAnimation =
        attrs["router-animation"] || attrs["routerAnimation"];

      ionRouter.handleNavigateBack(defaultHref, routerAnimation);
    };

    return () => {
      return h(
        "ion-back-button",
        {
          onClick,
          ...attrs,
        },
        slots.default && slots.default()
      );
    };
  },
  {
    name: "IonBackButton",
  }
);