Fix issues on Windows

Author: RichDom2185

lib/buildtools/build.js

@@ -6,7 +6,7 @@
 import pathlib from 'path';
 import getBuildCommand from '@sourceacademy/modules-repotools/builder';
 
-const repoRoot = pathlib.resolve(import.meta.dirname, '../..');
+const repoRoot = pathlib.resolve(pathlib.dirname(import.meta.dirname), '..', '..');
 
 const command = getBuildCommand({
   entryPoints: ['./src/commands/index.ts'],
@@ -35,7 +35,7 @@ const command = getBuildCommand({
         const newDirectory = pathlib.relative('./bin', repoRoot);
         return {
           external: true,
-          path: pathlib.posix.join(newDirectory, base),
+          path: pathlib.join(newDirectory, base),
         };
       });
     }

lib/repotools/src/utils.ts

@@ -108,7 +108,7 @@ export async function isBundleOrTabDirectory(directory: string) {
 
   async function recurser(directory: string): Promise<['bundle' | 'tab', string] | null> {
     try {
-      const packageJson = JSON.parse(await fs.readFile(`${directory}/package.json`, 'utf-8'));
+      const packageJson = JSON.parse(await fs.readFile(pathlib.join(directory, 'package.json'), 'utf-8'));
       const match = RE.exec(packageJson.name);
 
       if (match) {