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// Example of how to set the document page sizes// Reference from https://papersizes.io/a/a3
import * as fs from "fs";import { convertMillimetersToTwip, Document, Packer, PageOrientation, Paragraph } from "docx";
const doc = new Document({    sections: [        {            properties: {                page: {                    size: {                        orientation: PageOrientation.LANDSCAPE,                        height: convertMillimetersToTwip(210),                        width: convertMillimetersToTwip(148),                    },                },            },            children: [new Paragraph("Hello World")],        },        {            properties: {                page: {                    size: {                        orientation: PageOrientation.PORTRAIT,                        height: convertMillimetersToTwip(420),                        width: convertMillimetersToTwip(297),                    },                },            },            children: [new Paragraph("Hello World")],        },    ],});
Packer.toBuffer(doc).then((buffer) => {    fs.writeFileSync("My Document.docx", buffer);});