Property '$patch' does not exist on type when using custom DefineStoreOptionsBase

[jl-unitedlocating]

When defining a custom plugin I wrote, I was getting typescript error saying that $patch does not exist on type . e.g.

// ./stores/testStore.ts
import { defineStore } from 'pinia';

export const testStore = defineStore({
  state: () => ({
    foo: ' '
  }),
  actions: {
    test() {
      return new Promise((resolve) => {
        this.$patch(state => {
          state.foo = 'bar';
          resolve();
        })
      });
    }
  },
  testOption: true
});

results in the error

error TS2339: Property '$patch' does not exist on type '{ test(): Promise<unknown>; }'.

I was able to fix this issue, by adding

declare module 'pinia' {
  export interface DefineStoreOptionsBase<S, Store> {
    testOption?: Boolean
  }
}

to the top of ./stores/testStore.ts (below the imports). Those lines were already in the custom plugin's main.ts that I wrote. Is there a way to let pinia know what optional custom options can be included without modifying the testStore.ts file?