fix: minor paths-plugin fix

Author: s-panferov

src/host.ts

@@ -1,4 +1,3 @@
-import * as ts from "typescript";
 import * as fs from 'fs';
 import * as util from 'util';
 import * as path from 'path';

src/paths-plugin.ts

@@ -71,7 +71,7 @@ export class PathsPlugin implements ResolverPlugin {
         this.baseUrl = this.options.baseUrl;
         this.absoluteBaseUrl = path.resolve(
             path.dirname(this.configFilePath),
-            this.baseUrl
+            this.baseUrl || '.'
         );
 
         this.mappings = [];