Fix linting errors

demo/demo27.ts

@@ -1,16 +1,18 @@
-import { Document, Packer, Paragraph, ImportDocx } from "../build";
 import * as fs from "fs";
+import { Document, ImportDocx, Packer, Paragraph } from "../build";
 
-let importDocx = new ImportDocx();
+const importDocx = new ImportDocx();
 const filePath = "./demo/dotx/template.dotx";
+
 fs.readFile(filePath, (err, data) => {
     if (err) {
-        console.error(`failed to read file ${filePath}.`);
+        throw new Error(`Failed to read file ${filePath}.`);
     }
-    else {
-        importDocx.extract(data).then(templateDocument => {
-            let options = {};
-            options['templateDocument'] = templateDocument;
+
+    importDocx.extract(data).then((templateDocument) => {
+        const options = {
+            templateDocument,
+        };
 
         const doc = new Document(options);
         const paragraph = new Paragraph("Hello World");
@@ -19,9 +21,6 @@ fs.readFile(filePath, (err, data) => {
         const packer = new Packer();
         packer.toBuffer(doc).then((buffer) => {
             fs.writeFileSync("My Document.docx", buffer);
-                console.log('done. open MyDocument.docx');
         });
-        
     });
-    }
 });

src/file/file.ts

@@ -6,9 +6,9 @@ import {
     FooterReferenceType,
     HeaderReference,
     HeaderReferenceType,
-    SectionPropertiesOptions,
-    IHeaderOptions,
     IFooterOptions,
+    IHeaderOptions,
+    SectionPropertiesOptions,
 } from "./document/body/section-properties";
 import { FooterWrapper } from "./footer-wrapper";
 import { FootNotes } from "./footnotes";
@@ -22,8 +22,8 @@ import { ExternalStylesFactory } from "./styles/external-styles-factory";
 import { DefaultStylesFactory } from "./styles/factory";
 import { Table } from "./table";
 
-type DocumentHeaders = { header: HeaderWrapper; type: HeaderReferenceType }[];
-type DocumentFooters = { footer: FooterWrapper; type: FooterReferenceType }[];
+type DocumentHeaders = Array<{ header: HeaderWrapper; type: HeaderReferenceType }>;
+type DocumentFooters = Array<{ footer: FooterWrapper; type: FooterReferenceType }>;
 
 export class File {
     private readonly document: Document;