Why i can`t open the my plugin

Developers: Plugin & API
1

I’m a beginner,I’m learning the usage of modal.but I find i can’t open the plugin.
image

modal.ts
import { App, Modal } from "obsidian";

export class ExampleModal extends Modal {
  constructor(app: App) {
    super(app);
  }

  onOpen() {
    let { contentEl } = this;
    contentEl.setText("Look at me, I'm a modal! 👀");
  }

  onClose() {
    let { contentEl } = this;
    contentEl.empty();
  }
}

main.ts
import { Plugin } from "obsidian";
import { ExampleModal } from "./modal";

export default class ExamplePlugin extends Plugin {
  async onload() {
    this.addCommand({
      id: "display-modal",
      name: "Display modal",
      callback: () => {
        new ExampleModal(this.app).open();
      },
    });
  }
}

npx tsc -outFile main.js main.ts -m amd

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