diff --git a/scripts/js-api/build-types/buildApiSnapshot.js b/scripts/js-api/build-types/buildApiSnapshot.js
index 2816690973ea..fe53885529fd 100644
--- a/scripts/js-api/build-types/buildApiSnapshot.js
+++ b/scripts/js-api/build-types/buildApiSnapshot.js
@@ -296,7 +296,7 @@ async function generateConfigFiles(tempDirectory: string) {
   );
   const adjustedApiExtractorConfig = apiExtractorConfig.replaceAll(
     '${typegen_directory}',
-    tempDirectory,
+    tempDirectory.split(path.sep).join('/'),
   );
   await fs.writeFile(
     path.join(tempDirectory, API_EXTRACTOR_CONFIG_FILE),
diff --git a/scripts/js-api/build-types/transforms/typescript/__tests__/replaceDefaultExportName-test.js b/scripts/js-api/build-types/transforms/typescript/__tests__/replaceDefaultExportName-test.js
index 394ac52b8dad..dd2e6711e9ec 100644
--- a/scripts/js-api/build-types/transforms/typescript/__tests__/replaceDefaultExportName-test.js
+++ b/scripts/js-api/build-types/transforms/typescript/__tests__/replaceDefaultExportName-test.js
@@ -11,6 +11,7 @@
 const createReplaceDefaultExportName = require('../replaceDefaultExportName');
 const babel = require('@babel/core');
 const flowApiTranslator = require('flow-api-translator');
+const path = require('node:path');
 
 const prettierOptions = {parser: 'babel'};
 
@@ -32,7 +33,10 @@ async function translate(code: string, fileName: string): Promise<string> {
 describe('replaceDefaultExportName', () => {
   test('should replace default export name with unambiguous one', async () => {
     const code = `export default Foo;`;
-    const result = await translate(code, 'mock/path/to/module/Foo.js');
+    const result = await translate(
+      code,
+      path.join('mock', 'path', 'to', 'module', 'Foo.js'),
+    );
     expect(result).toMatchInlineSnapshot(`
       "declare const $$Foo: typeof Foo;
       declare type $$Foo = typeof $$Foo;
diff --git a/scripts/js-api/build-types/transforms/typescript/replaceDefaultExportName.js b/scripts/js-api/build-types/transforms/typescript/replaceDefaultExportName.js
index 8b3dedcea885..42110551b8a8 100644
--- a/scripts/js-api/build-types/transforms/typescript/replaceDefaultExportName.js
+++ b/scripts/js-api/build-types/transforms/typescript/replaceDefaultExportName.js
@@ -10,11 +10,13 @@
 
 import type {PluginObj} from '@babel/core';
 
+const path = require('node:path');
+
 function createDefaultExportNameReplacer(filePath: string): PluginObj<unknown> {
   return {
     visitor: {
       Identifier(node) {
-        const fileName = filePath.split('/').pop() ?? '';
+        const fileName = path.basename(filePath);
         const moduleName = fileName.split('.')[0];
 
         if (node.node.name === '$$EXPORT_DEFAULT_DECLARATION$$') {
diff --git a/scripts/js-api/build-types/utils/resolveCyclicImportsInDefinition.js b/scripts/js-api/build-types/utils/resolveCyclicImportsInDefinition.js
index c5869df0e119..9602a7ed29d4 100644
--- a/scripts/js-api/build-types/utils/resolveCyclicImportsInDefinition.js
+++ b/scripts/js-api/build-types/utils/resolveCyclicImportsInDefinition.js
@@ -24,8 +24,11 @@ function getReplacementInfo(
   filePath: string,
   packages: PackageConfig,
 ) {
-  const sourceDirectory = filePath.split('/').slice(0, -1).join('/');
-  const pathToRoot = path.relative(sourceDirectory, rootPath);
+  const sourceDirectory = path.dirname(filePath);
+  const pathToRoot = path
+    .relative(sourceDirectory, rootPath)
+    .split(path.sep)
+    .join('/');
 
   const packageToReplace = packages.find(({name}) => source.startsWith(name));
 
@@ -50,7 +53,7 @@ const visitor: PluginObj<{
 
       nodePath.node.source.value = nodePath.node.source.value.replace(
         packageToReplace.name,
-        path.join(pathToRoot, packageToReplace.directory),
+        path.posix.join(pathToRoot, packageToReplace.directory),
       );
     },
     ExportNamedDeclaration(nodePath, state) {
@@ -72,7 +75,7 @@ const visitor: PluginObj<{
       // $FlowExpectedError[incompatible-use]
       nodePath.node.source.value = nodePath.node.source.value.replace(
         packageToReplace.name,
-        path.join(pathToRoot, packageToReplace.directory),
+        path.posix.join(pathToRoot, packageToReplace.directory),
       );
     },
   },