A custom function which returns a Promise

Custom Function returns a Promise.EXCEL.yaml

name: Custom Function returns a Promise
description: A custom function which returns a Promise
host: EXCEL
api_set: {}
script:
  content: |
    /**
     * Async custom function
     * @customfunction
     */
    async function doSomething(seconds: number): Promise<number> {
      await delay(seconds);

      return seconds;
    }

    async function delay(seconds: number): Promise<void> {
      return new Promise((resolve) => setTimeout(resolve, seconds * 1000));
    }
  language: typescript
libraries: |
  https://appsforoffice.microsoft.com/lib/1/hosted/office.js
  @types/office-js

  office-ui-fabric-js@1.4.0/dist/css/fabric.min.css
  office-ui-fabric-js@1.4.0/dist/css/fabric.components.min.css

  core-js@2.4.1/client/core.min.js
  @types/core-js

  @microsoft/office-js-helpers@0.7.4/dist/office.helpers.min.js
  @microsoft/office-js-helpers@0.7.4/dist/office.helpers.d.ts

  jquery@3.1.1
  @types/jquery@3.3.1