Simple Extension

This type of extension is the simplest. You only needs to create an extension class that inherits from PLExtension and implements initialize and dispose. And the export of the extension entry file contains a function called initialize:

import { PLAPI, PLExtAPI, PLExtension, PLMainAPI } from "paperlib-api/api";

class PaperlibHelloworldExtension extends PLExtension {
  disposeCallbacks: (() => void)[];

  constructor() {
    super({
      id: "...",
      defaultPreference: {
        ...
      },
    });

    this.disposeCallbacks = [];
  }

  async initialize() {
    await PLExtAPI.extensionPreferenceService.register(
      this.id,
      this.defaultPreference,
    );

    this.printSomething();

  }

  async dispose() {
    PLExtAPI.extensionPreferenceService.unregister(this.id);

    for (const disposeCallback of this.disposeCallbacks) {
      disposeCallback();
    }
  }

  printSomething() {
    console.log("Hello world from extension!");
  }
}

async function initialize() {
  const extension = new PaperlibHelloworldExtension();
  await extension.initialize();

  return extension;
}

export { initialize };