JavaScriptを使用して2つのPDFを比較します

import * as fs from "fs";

const wordsApi = new WordsApi("####-####-####-####-####", "##################");
const fileName1 = "Input1.pdf";
const fileName2 = "Input2.pdf";
const fileResult = "Output.pdf";

// ドキュメントをクラウドストレージにアップロードします。
const firstDocumentContent = fs.createReadStream(fileName1);
const uploadFirstFileRequest = new model.UploadFileRequest({
    fileContent: firstDocumentContent,
    path: fileName1
});

wordsApi.uploadFile(uploadFirstFileRequest)
.then((uploadFirstFileRequestResult) => {
    // tslint:disable-next-line:no-console
    console.log("Result of UploadFirstFileRequest: ", uploadFirstFileRequestResult);
    const secondDocumentContent = fs.createReadStream(fileName2);
    const uploadSecondFileRequest = new model.UploadFileRequest({
        fileContent: secondDocumentContent,
        path: fileName2
    });
    wordsApi.uploadFile(uploadSecondFileRequest)
    .then((uploadSecondFileRequestResult) => {
        // tslint:disable-next-line:no-console
        console.log("Result of UploadSecondFileRequest: ", uploadSecondFileRequestResult);

// クラウド内のドキュメントを比較します。
        const compareDataOptions = new model.CompareData({
            author: "author",
            fileReference: model.FileReference.fromRemoteFilePath(fileName2)
        })
        const compareDocumentRequest = new model.CompareDocumentRequest({
            name: fileName1,
            compareData: compareDataOptions,
            destFileName: fileResult
        });
        wordsApi.compareDocument(compareDocumentRequest)
        .then((compareDocumentRequestResult) => {
            // tslint:disable-next-line:no-console
            console.log("Result of CompareDocumentRequest: ", compareDocumentRequestResult);

// クラウドストレージから結果ドキュメントをダウンロードします。
            const downloadFileRequest = new model.DownloadFileRequest({
                path: fileResult
            });
            wordsApi.downloadFile(downloadFileRequest)
            .then((downloadFileRequestResult) => {
                // tslint:disable-next-line:no-console
                console.log("Result of DownloadFileRequest: ", downloadFileRequestResult);
                fs.writeFileSync(fileResult, downloadFileRequestResult.body);
            });
        });
    });
});