diff --git a/esbuild.config.mjs b/esbuild.config.mjs
index 1b1b62953..bbebf4aca 100644
--- a/esbuild.config.mjs
+++ b/esbuild.config.mjs
@@ -1,14 +1,17 @@
 import { build } from "esbuild";
 import { copy } from "esbuild-plugin-copy";
 
-await build({
-	entryPoints: ["src/*.ts"],
-	bundle: false,
-	outdir: "dist",
-	outbase: "src",
+const common = {
 	platform: "node",
 	format: "cjs",
 	target: "node22",
+};
+
+await build({
+	...common,
+	entryPoints: ["src/internal.ts"],
+	bundle: true,
+	outfile: "dist/internal.js",
 	plugins: [
 		copy({
 			assets: [
@@ -24,3 +27,17 @@ await build({
 		}),
 	],
 });
+
+// Everything else is a thin wrapper that requires `./internal.js`.
+await build({
+	...common,
+	entryPoints: [
+		"src/index.ts",
+		"src/errors.ts",
+		"src/strip-loader.ts",
+		"src/transform-loader.ts",
+	],
+	bundle: false,
+	outdir: "dist",
+	outbase: "src",
+});
diff --git a/src/index.ts b/src/index.ts
index cec305e59..3d9d18d00 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,2 @@
-export { transformSync } from "./transform.js";
+// Public API of the `amaro` package (`exports["."]`).
+export { transformSync } from "./internal.js";
diff --git a/src/internal.ts b/src/internal.ts
new file mode 100644
index 000000000..c866253e8
--- /dev/null
+++ b/src/internal.ts
@@ -0,0 +1,51 @@
+import type {
+	ModuleSyntaxTransformOutput,
+	Options,
+	TransformOutput,
+} from "../lib/wasm";
+import swc from "../lib/wasm.js";
+
+const DEFAULT_OPTIONS = {
+	mode: "strip-only",
+	deprecatedTsModuleAsError: true,
+	// default transform will only work when mode is "transform"
+	transform: {
+		verbatimModuleSyntax: true,
+		nativeClassProperties: true,
+		noEmptyExport: true,
+		importNotUsedAsValues: "preserve",
+	},
+} as Options;
+
+export function transformSync(
+	source: string,
+	options?: Options,
+): TransformOutput {
+	// Ensure that the source code is a string
+	const input = `${source ?? ""}`;
+	return swc.transformSync(input, {
+		...DEFAULT_OPTIONS,
+		...options,
+	});
+}
+
+export function transformModuleSyntax(
+	source: string,
+): ModuleSyntaxTransformOutput {
+	return swc.transformModuleSyntax(`${source ?? ""}`);
+}
+
+export function getFirstExpression(
+	source: string,
+	startColumn: number,
+): string {
+	return swc.getFirstExpression(`${source ?? ""}`, startColumn);
+}
+
+export function isValidSyntax(source: string): boolean {
+	return swc.isValidSyntax(`${source ?? ""}`);
+}
+
+export function isRecoverableError(source: string): boolean {
+	return swc.isRecoverableError(`${source ?? ""}`);
+}
diff --git a/src/nodejs.ts b/src/nodejs.ts
deleted file mode 100644
index 90ce82e0a..000000000
--- a/src/nodejs.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import type { ModuleSyntaxTransformOutput } from "../lib/wasm";
-import swc from "../lib/wasm.js";
-
-export function transformModuleSyntax(
-	source: string,
-): ModuleSyntaxTransformOutput {
-	return swc.transformModuleSyntax(`${source ?? ""}`);
-}
-
-export function getFirstExpression(
-	source: string,
-	startColumn: number,
-): string {
-	return swc.getFirstExpression(`${source ?? ""}`, startColumn);
-}
-
-export function isValidSyntax(source: string): boolean {
-	return swc.isValidSyntax(`${source ?? ""}`);
-}
-
-export function isRecoverableError(source: string): boolean {
-	return swc.isRecoverableError(`${source ?? ""}`);
-}
diff --git a/src/transform.ts b/src/transform.ts
deleted file mode 100644
index 877831a61..000000000
--- a/src/transform.ts
+++ /dev/null
@@ -1,26 +0,0 @@
-import type { Options, TransformOutput } from "../lib/wasm";
-import swc from "../lib/wasm.js";
-
-const DEFAULT_OPTIONS = {
-	mode: "strip-only",
-	deprecatedTsModuleAsError: true,
-	// default transform will only work when mode is "transform"
-	transform: {
-		verbatimModuleSyntax: true,
-		nativeClassProperties: true,
-		noEmptyExport: true,
-		importNotUsedAsValues: "preserve",
-	},
-} as Options;
-
-export function transformSync(
-	source: string,
-	options?: Options,
-): TransformOutput {
-	// Ensure that the source code is a string
-	const input = `${source ?? ""}`;
-	return swc.transformSync(input, {
-		...DEFAULT_OPTIONS,
-		...options,
-	});
-}
diff --git a/test/nodejs.test.js b/test/nodejs.test.js
index 0df5cb0bd..31cb5c133 100644
--- a/test/nodejs.test.js
+++ b/test/nodejs.test.js
@@ -5,7 +5,7 @@ const {
 	isRecoverableError,
 	isValidSyntax,
 	transformModuleSyntax,
-} = require("../dist/nodejs.js");
+} = require("../dist/internal.js");
 
 test("should transform module syntax for the Node.js REPL", () => {
 	const result = transformModuleSyntax(