fix(babel): normalize resolved paths to POSIX so Windows rewrites work (#390)

path.resolve separates with backslashes on Windows, so a relative import
resolved against the file never matched the forward-slash package paths
the handlers split on, and was left unrewritten.

Author: YevheniiKotyrlo

src/babel/helpers.ts

@@ -1,3 +1,5 @@
+import { dirname, resolve, sep } from "path";
+
 import tBabelTypes, { type CallExpression } from "@babel/types";
 
 export type BabelTypes = typeof tBabelTypes;
@@ -38,3 +40,8 @@ export function getInteropRequireDefaultSource(
 
   return requireArg.value;
 }
+
+// The handlers match "/"-separated package paths, and path.resolve separates with "\" on Windows
+export function resolveImportSource(filename: string, source: string): string {
+  return resolve(dirname(filename), source).split(sep).join("/");
+}

src/babel/react-native-web.ts

@@ -1,5 +1,3 @@
-import { dirname, resolve } from "path";
-
 import { type NodePath } from "@babel/traverse";
 import tBabelTypes, {
   type CallExpression,
@@ -10,12 +8,13 @@ import tBabelTypes, {
 } from "@babel/types";
 
 import { allowedModules } from "./allowedModules";
+import { resolveImportSource } from "./helpers";
 
 type BabelTypes = typeof tBabelTypes;
 
 function parseReactNativeWebSource(source: string, filename: string) {
   if (source.startsWith(".")) {
-    source = resolve(dirname(filename), source);
+    source = resolveImportSource(filename, source);
 
     const internalPath = source.split("react-native-web/dist")[1];
     if (!internalPath) {

src/babel/react-native.ts

@@ -1,5 +1,3 @@
-import { dirname, resolve } from "path";
-
 import { type NodePath } from "@babel/traverse";
 import tBabelTypes, {
   type ImportDeclaration,
@@ -9,12 +7,13 @@ import tBabelTypes, {
 } from "@babel/types";
 
 import { allowedModules } from "./allowedModules";
+import { resolveImportSource } from "./helpers";
 
 type BabelTypes = typeof tBabelTypes;
 
 function parseReactNativeSource(source: string, filename: string) {
   if (source.startsWith(".")) {
-    source = resolve(dirname(filename), source);
+    source = resolveImportSource(filename, source);
 
     const internalPath = source.split("react-native/Libraries/Components/")[1];
     if (!internalPath) {