diff --git a/src/browser.ts b/src/browser.ts
index f6955fa..bb06dfd 100644
--- a/src/browser.ts
+++ b/src/browser.ts
@@ -2,7 +2,7 @@ import { setup } from './core.ts'
 import { humanize } from './utils.ts'
 import type { Debug, Debugger } from './types.ts'
 
-export const colors: string[] = [
+const colors: string[] = [
   '#0000CC',
   '#0000FF',
   '#0033CC',
@@ -81,7 +81,7 @@ export const colors: string[] = [
   '#FFCC33',
 ]
 
-export function useColors(): boolean {
+function useColors(): boolean {
   return true
 }
 
@@ -213,3 +213,10 @@ createDebug.formatters.j = function (v) {
 
 export default createDebug
 export type * from './types.ts'
+
+// @ts-expect-error
+createDebug.default = createDebug
+// @ts-expect-error
+createDebug.debug = createDebug
+
+export { createDebug as 'module.exports' }
diff --git a/src/node.ts b/src/node.ts
index 891a511..97184ce 100644
--- a/src/node.ts
+++ b/src/node.ts
@@ -14,7 +14,7 @@ export function log(...args: any[]): void {
   process.stderr.write(`${formatWithOptions(inspectOpts, ...args)}\n`)
 }
 
-export const colors: number[] =
+const colors: number[] =
   process.stderr.getColorDepth && process.stderr.getColorDepth() > 2
     ? [
         20, 21, 26, 27, 32, 33, 38, 39, 40, 41, 42, 43, 44, 45, 56, 57, 62, 63,
@@ -62,7 +62,7 @@ function load(): string {
   return process.env.DEBUG || ''
 }
 
-function save(namespaces: string) {
+function save(namespaces: string): void {
   if (namespaces) {
     process.env.DEBUG = namespaces
   } else {
@@ -75,7 +75,7 @@ function save(namespaces: string) {
 /**
  * Is stdout a TTY? Colored output is enabled when `true`.
  */
-export function useColors(): boolean {
+function useColors(): boolean {
   return 'colors' in inspectOpts
     ? Boolean(inspectOpts.colors)
     : isatty(process.stderr.fd)
@@ -113,7 +113,7 @@ function getDate(): string {
   return `${new Date().toISOString()} `
 }
 
-function init(debug: Debugger) {
+function init(debug: Debugger): void {
   debug.inspectOpts = Object.assign({}, inspectOpts)
 }
 
@@ -150,3 +150,10 @@ createDebug.formatters.O = function (v) {
 
 export default createDebug
 export type * from './types.ts'
+
+// @ts-expect-error
+createDebug.default = createDebug
+// @ts-expect-error
+createDebug.debug = createDebug
+
+export { createDebug as 'module.exports' }
diff --git a/tests/conformance.test.ts b/tests/conformance.test.ts
index cef66ed..e439a92 100644
--- a/tests/conformance.test.ts
+++ b/tests/conformance.test.ts
@@ -12,17 +12,23 @@ const removedAPIs = new Set([
   'load', // private API
   'colors', // private API
   'useColors', // private API
+  'inspectOpts', // private API
 ])
 
 describe('conformance', () => {
   test('require: same exports', () => {
     const debug = require('debug')
-    const obug = require('../dist/node')
+    const obugNode = require('../dist/node')
     const debugKeys = Object.keys(debug)
       .filter((key) => !removedAPIs.has(key))
       .sort()
-    const obugKeys = Object.keys(obug).sort()
+    const obugKeys = Object.keys(obugNode)
+      .filter((k) => k !== 'inspectOpts')
+      .sort()
     expect(obugKeys).toEqual(debugKeys)
+
+    const obugBrowser = require('../dist/browser')
+    expect(Object.keys(obugBrowser).sort()).toEqual(obugKeys)
   })
 
   test('import: same exports', async () => {
@@ -35,5 +41,8 @@ describe('conformance', () => {
       .filter((key) => key !== 'createDebug' && key !== 'module.exports')
       .sort()
     expect(obugKeys).toEqual(debugKeys)
+
+    const obugBrowser = await import('../dist/browser')
+    expect(Object.keys(obugBrowser).sort()).toEqual(Object.keys(obug).sort())
   })
 })