Insertion of LineBreak is automatic for the first Heading

ParaBodyBreak.WORD.yaml

name: ParaBodyBreak
description: Insertion of LineBreak is automatic for the first Heading
host: WORD
api_set: {}
script:
  content: |
    $("#run").click(() => tryCatch(run));

    async function insertHeading() {
      await Word.run(async context => {
        const body = context.document.body;
        const heading = context.document.body.insertParagraph('Heading', Word.InsertLocation.end);
        heading.styleBuiltIn = Word.Style.heading1;
        await context.sync();
      })
    }

    async function insertParagraph() {
      const value = "He heard the crack echo in the late afternoon about a mile away. "+
      "His heart started racing and he bolted into a full sprint. \"It wasn't a gunshot, "+
      "it wasn't a gunshot,\" he repeated under his breathlessness as he continued to sprint";
      await Word.run(async context => {
        const body = context.document.body;
        const range = context.document.body.insertText(value, Word.InsertLocation.end);
        range.styleBuiltIn = Word.Style.normal;
        await context.sync();
      })
    }

    async function run() {
      await Word.run(async (context) => {
        for (let i=0;i<3; ++i) {
          insertHeading();
          insertParagraph();
        }

        await context.sync();
      });
    }

    /** Default helper for invoking an action and handling errors. */
    async function tryCatch(callback) {
      try {
        await callback();
      } catch (error) {
        // Note: In a production add-in, you'd want to notify the user through your add-in's UI.
        console.error(error);
      }
    }
  language: typescript
template:
  content: |
    <button id="run" class="ms-Button">
        <span class="ms-Button-label">Run</span>
    </button>
  language: html
style:
  content: |-
    section.samples {
        margin-top: 20px;
    }

    section.samples .ms-Button, section.setup .ms-Button {
        display: block;
        margin-bottom: 5px;
        margin-left: 20px;
        min-width: 80px;
    }
  language: css
libraries: |
  https://appsforoffice.microsoft.com/lib/1/hosted/office.js
  @types/office-js

  [email protected]/dist/css/fabric.min.css
  [email protected]/dist/css/fabric.components.min.css

  [email protected]/client/core.min.js
  @types/core-js

  [email protected]
  @types/[email protected]