fix(cjs): make resolver chainable

src/cjs/api/module-resolve-filename.ts

@@ -10,12 +10,11 @@ const nodeModulesPath = `${path.sep}node_modules${path.sep}`;
 
 type ResolveFilename = typeof Module._resolveFilename;
 
-const defaultResolver = Module._resolveFilename.bind(Module);
-
 /**
  * Typescript gives .ts, .cts, or .mts priority over actual .js, .cjs, or .mjs extensions
  */
 const resolveTsFilename = (
+	nextResolve: ResolveFilename,
 	request: string,
 	parent: Module.Parent,
 	isMain: boolean,
@@ -35,7 +34,7 @@ const resolveTsFilename = (
 
 	for (const tryTsPath of tsPath) {
 		try {
-			return defaultResolver(
+			return nextResolve(
 				tryTsPath,
 				parent,
 				isMain,
@@ -53,7 +52,9 @@ const resolveTsFilename = (
 	}
 };
 
-export const resolveFilename: ResolveFilename = (
+export const createResolveFilename = (
+	nextResolve: ResolveFilename,
+): ResolveFilename => (
 	request,
 	parent,
 	isMain,
@@ -74,22 +75,22 @@ export const resolveFilename: ResolveFilename = (
 	if (
 		tsconfigPathsMatcher
 
-		// bare specifier
-		&& !isRelativePath(request)
+			// bare specifier
+			&& !isRelativePath(request)
 
-		// Dependency paths should not be resolved using tsconfig.json
-		&& !parent?.filename?.includes(nodeModulesPath)
+			// Dependency paths should not be resolved using tsconfig.json
+			&& !parent?.filename?.includes(nodeModulesPath)
 	) {
 		const possiblePaths = tsconfigPathsMatcher(request);
 
 		for (const possiblePath of possiblePaths) {
-			const tsFilename = resolveTsFilename(possiblePath, parent, isMain, options);
+			const tsFilename = resolveTsFilename(nextResolve, possiblePath, parent, isMain, options);
 			if (tsFilename) {
 				return tsFilename;
 			}
 
 			try {
-				return defaultResolver(
+				return nextResolve(
 					possiblePath,
 					parent,
 					isMain,
@@ -99,10 +100,10 @@ export const resolveFilename: ResolveFilename = (
 		}
 	}
 
-	const tsFilename = resolveTsFilename(request, parent, isMain, options);
+	const tsFilename = resolveTsFilename(nextResolve, request, parent, isMain, options);
 	if (tsFilename) {
 		return tsFilename;
 	}
 
-	return defaultResolver(request, parent, isMain, options);
+	return nextResolve(request, parent, isMain, options);
 };

src/cjs/api/register.ts

@@ -1,7 +1,7 @@
 import Module from 'node:module';
 import { loadTsconfig } from '../../utils/tsconfig.js';
 import { extensions } from './module-extensions.js';
-import { resolveFilename } from './module-resolve-filename.js';
+import { createResolveFilename } from './module-resolve-filename.js';
 
 export const register = () => {
 	const { sourceMapsEnabled } = process;
@@ -11,12 +11,12 @@ export const register = () => {
 
 	// register
 	process.setSourceMapsEnabled(true);
+	const resolveFilename = createResolveFilename(_resolveFilename);
+	Module._resolveFilename = resolveFilename;
 	// @ts-expect-error overwriting read-only property
 	Module._extensions = extensions;
-	Module._resolveFilename = resolveFilename;
 
-	// unregister
-	return () => {
+	const unregister = () => {
 		if (sourceMapsEnabled === false) {
 			process.setSourceMapsEnabled(false);
 		}
@@ -25,4 +25,6 @@ export const register = () => {
 		Module._extensions = _extensions;
 		Module._resolveFilename = _resolveFilename;
 	};
+
+	return unregister;
 };

src/cjs/api/require.ts

@@ -1,7 +1,8 @@
+import Module from 'node:module';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { register } from './register.js';
-import { resolveFilename } from './module-resolve-filename.js';
+import { createResolveFilename } from './module-resolve-filename.js';
 
 const getRequestContext = (
 	id: string,
@@ -35,6 +36,8 @@ const tsxRequire = (
 	}
 };
 
+const resolveFilename = createResolveFilename(Module._resolveFilename);
+
 const resolve = (
 	id: string,
 	fromFile: string | URL,