docx-js/demo/68-numbering-instances-and-starting-number.ts

import * as fs from "fs";
import { Document, Packer, Paragraph, PageNumberFormat} from "../build";

const doc = new Document({
  numbering:{
    config:[
      {
        reference: 'ref1',
        levels: [
          {
            level: 0,
            format: PageNumberFormat.DECIMAL,
            text: '%1',
            start: 10,
          }
        ],
      },
      {
        reference: 'ref2',
        levels: [
          {
            level: 0,
            format: PageNumberFormat.DECIMAL,
            text: '%1'
          }
        ],
      },
    ]
  },
  sections: [{
    children: [
      new Paragraph({
        text: "REF1 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 0,
          level: 0,
        }
      }),
      new Paragraph({
        text: "REF1 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 0,
          level: 0,
        }
      }),
      new Paragraph({
        text: "REF1 - inst:1 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 1,
          level: 0,
        },
      }),
      new Paragraph({
        text: "REF1 - inst:1 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 1,
          level: 0,
        }
      }),
      new Paragraph({
        text: "REF2 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref2',
          instance: 1,
          level: 0,
        }
      }),
      new Paragraph({
        text: "REF2 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref2',
          instance: 1,
          level: 0,
        }
      })
    ],
  }]
});

Packer.toBuffer(doc).then((buffer) => {
    fs.writeFileSync("My Document.docx", buffer);
});