fix(compiler): Improve path handling in compiler options

ts/tsbuild.classes.compiler.ts

@@ -1,5 +1,6 @@
 // import all the stuff we need
 import * as plugins from './plugins.js';
+import * as paths from './paths.js';
 import type { CompilerOptions, ScriptTarget, ModuleKind } from './tsbuild.exports.js';
 
 /**
@@ -20,6 +21,7 @@ export const compilerOptionsDefault: CompilerOptions = {
   esModuleInterop: true,
   useDefineForClassFields: false,
   verbatimModuleSyntax: true,
+  baseUrl: './',
 };
 
 /**
@@ -49,6 +51,20 @@ export const mergeCompilerOptions = (
           moduleResolution: plugins.typescript.ModuleResolutionKind.NodeJs,
         }
       : {}),
+    ...(() => {
+      const returnObject: CompilerOptions = {};
+      console.log(`looking at tsconfig.json at ${paths.cwd}`);
+      const tsconfig = plugins.smartfile.fs.toObjectSync(plugins.path.join(paths.cwd, 'tsconfig.json'));
+      if (tsconfig && tsconfig.compilerOptions && tsconfig.compilerOptions.baseUrl) {
+        console.log('baseUrl found in tsconfig.json');
+        returnObject.baseUrl = tsconfig.compilerOptions.baseUrl;
+      }
+      if (tsconfig && tsconfig.compilerOptions && tsconfig.compilerOptions.paths) {
+        console.log('paths found in tsconfig.json');
+        returnObject.paths = tsconfig.compilerOptions.paths;
+      }
+      return returnObject;
+    })(),
   };
 
   console.log(mergedOptions);