fix: remove express dependency (#198)

package.json

@@ -21,23 +21,25 @@
   "dependencies": {
     "chalk": "^4.0.0",
     "cheerio": "^1.0.0-rc.2",
-    "express": "^4.17.1",
+    "finalhandler": "^1.1.2",
     "gaxios": "^4.0.0",
     "jsonexport": "^3.0.0",
     "marked": "^1.2.5",
     "meow": "^8.0.0",
     "p-queue": "^6.2.1",
+    "serve-static": "^1.14.1",
     "server-destroy": "^1.0.1",
     "update-notifier": "^5.0.0"
   },
   "devDependencies": {
     "@types/chai": "^4.2.7",
     "@types/cheerio": "^0.22.10",
-    "@types/express": "^4.17.9",
+    "@types/finalhandler": "^1.1.0",
     "@types/marked": "^1.2.0",
     "@types/meow": "^5.0.0",
     "@types/mocha": "^8.0.0",
     "@types/node": "^12.7.12",
+    "@types/serve-static": "^1.13.8",
     "@types/server-destroy": "^1.0.0",
     "@types/sinon": "^9.0.0",
     "@types/update-notifier": "^5.0.0",

src/index.ts

@@ -2,7 +2,8 @@ import {EventEmitter} from 'events';
 import * as gaxios from 'gaxios';
 import * as http from 'http';
 import enableDestroy = require('server-destroy');
-import * as express from 'express';
+import finalhandler = require('finalhandler');
+import serveStatic = require('serve-static');
 import * as fs from 'fs';
 import * as util from 'util';
 import * as path from 'path';
@@ -179,9 +180,8 @@ export class LinkChecker extends EventEmitter {
         if (s.isFile()) {
           const pathParts = options.path[0].split(path.sep);
           options.path = [path.sep + pathParts[pathParts.length - 1]];
-          options.serverRoot = pathParts
-            .slice(0, pathParts.length - 1)
-            .join(path.sep);
+          options.serverRoot =
+            pathParts.slice(0, pathParts.length - 1).join(path.sep) || '.';
         } else {
           options.serverRoot = options.path[0];
           options.path = '/';
@@ -201,27 +201,29 @@ export class LinkChecker extends EventEmitter {
    * @returns Promise that resolves with the instance of the HTTP server
    */
   private async startWebServer(root: string, port: number, markdown?: boolean) {
-    const app = express()
-      .use(async (req, res, next) => {
-        if (!markdown) {
-          return next();
-        }
-        const pathParts = req.path.split('/').filter(x => !!x);
-        const ext = path.extname(pathParts[pathParts.length - 1]);
-        if (ext.toLowerCase() === '.md') {
-          const filePath = path.join(path.resolve(root), req.path);
-          const data = await readFile(filePath, {encoding: 'utf-8'});
-          const result = marked(data, {gfm: true});
-          res.send(result).end();
-          return;
-        }
-        return next();
-      })
-      .use(express.static(path.resolve(root)));
-    const server = await new Promise<http.Server>(resolve => {
-      const s = app.listen(port, () => resolve(s));
+    return new Promise<http.Server>((resolve, reject) => {
+      const serve = serveStatic(root);
+      const server = http
+        .createServer(async (req, res) => {
+          const pathParts = req.url!.split('/').filter(x => !!x);
+          if (pathParts.length > 0) {
+            const ext = path.extname(pathParts[pathParts.length - 1]);
+            if (markdown && ext.toLowerCase() === '.md') {
+              const filePath = path.join(path.resolve(root), req.url!);
+              const data = await readFile(filePath, {encoding: 'utf-8'});
+              const result = marked(data, {gfm: true});
+              res.writeHead(200, {
+                'content-type': 'text/html',
+              });
+              res.end(result);
+              return;
+            }
+          }
+          return serve(req, res, finalhandler(req, res) as () => void);
+        })
+        .listen(port, () => resolve(server))
+        .on('error', reject);
     });
-    return server;
   }
 
   /**