diff --git a/.eslintrc b/.eslintrc
index ac6ca880..d74b2e83 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -11,6 +11,9 @@
       }
     }
   ],
+  "globals": {
+    "Deno": true
+  },
   "parserOptions": {
     "ecmaVersion": 2018,
     "sourceType": "module"
diff --git a/browser.mjs b/browser.mjs
new file mode 100644
index 00000000..5b950f8c
--- /dev/null
+++ b/browser.mjs
@@ -0,0 +1,13 @@
+// Bootstrap cliui with esm dependencies:
+import { cliui } from './build/lib/index.js'
+import stringWidth from 'https://esm.sh/string-width@^6'
+import stripAnsi from 'https://esm.sh/strip-ansi@^7'
+import wrap from 'https://esm.sh/wrap-ansi@^8'
+
+export default function ui (opts) {
+  return cliui(opts, {
+    stringWidth,
+    stripAnsi,
+    wrap
+  })
+}
diff --git a/deno.ts b/deno.ts
index a94e49f3..fa9d4630 100644
--- a/deno.ts
+++ b/deno.ts
@@ -1,13 +1,22 @@
-// Bootstrap cliui with CommonJS dependencies:
+// Bootstrap cliui with esm dependencies:
 import { cliui, UI } from './build/lib/index.js'
 import type { UIOptions } from './build/lib/index.d.ts'
-import { wrap, stripAnsi } from './build/lib/string-utils.js'
 
-export default function ui (opts: UIOptions): UI {
-  return cliui(opts, {
-    stringWidth: (str: string) => {
-      return [...str].length
-    },
+import stringWidth from 'https://esm.sh/string-width@6'
+import stripAnsi from 'https://esm.sh/strip-ansi@7'
+import wrap from 'https://esm.sh/wrap-ansi@8'
+
+export default function ui (opts?: UIOptions): UI {
+  let optsWithWidth = opts ?? {}
+  if (!optsWithWidth.width) {
+    const { columns } = Deno.consoleSize()
+    if (columns) {
+      optsWithWidth = Object.assign(optsWithWidth, { width: columns })
+    }
+  }
+
+  return cliui(optsWithWidth, {
+    stringWidth,
     stripAnsi,
     wrap
   })
diff --git a/index.mjs b/index.mjs
index bc7a022b..c1e7aba0 100644
--- a/index.mjs
+++ b/index.mjs
@@ -1,12 +1,12 @@
 // Bootstrap cliui with CommonJS dependencies:
 import { cliui } from './build/lib/index.js'
-import { wrap, stripAnsi } from './build/lib/string-utils.js'
+import stringWidth from 'string-width'
+import stripAnsi from 'strip-ansi'
+import wrap from 'wrap-ansi'
 
 export default function ui (opts) {
   return cliui(opts, {
-    stringWidth: (str) => {
-      return [...str].length
-    },
+    stringWidth,
     stripAnsi,
     wrap
   })
diff --git a/lib/cjs.ts b/lib/cjs.ts
index bda4241a..dbe2ef39 100644
--- a/lib/cjs.ts
+++ b/lib/cjs.ts
@@ -3,7 +3,7 @@ import { cliui, UIOptions } from './index.js'
 const stringWidth = require('string-width')
 const stripAnsi = require('strip-ansi')
 const wrap = require('wrap-ansi')
-export default function ui (opts: UIOptions) {
+export default function ui (opts?: UIOptions) {
   return cliui(opts, {
     stringWidth,
     stripAnsi,
diff --git a/lib/index.ts b/lib/index.ts
index 0673c3a5..0b1fc774 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -11,10 +11,11 @@ const bottom = 2
 const left = 3
 
 export interface UIOptions {
-  width: number;
+  width?: number;
   wrap?: boolean;
   rows?: string[];
 }
+type UIConstructorOptions = UIOptions & {width:number};
 
 interface Column {
   text: string;
@@ -45,7 +46,7 @@ export class UI {
   wrap: boolean;
   rows: ColumnArray[];
 
-  constructor (opts: UIOptions) {
+  constructor (opts: UIConstructorOptions) {
     this.width = opts.width
     this.wrap = opts.wrap ?? true
     this.rows = []
@@ -380,7 +381,7 @@ function alignCenter (str: string, width: number): string {
 }
 
 let mixin: Mixin
-export function cliui (opts: Partial<UIOptions>, _mixin: Mixin) {
+export function cliui (opts: UIOptions | undefined, _mixin: Mixin) {
   mixin = _mixin
   return new UI({
     width: opts?.width || getWindowWidth(),
diff --git a/lib/string-utils.ts b/lib/string-utils.ts
index 23d78fdb..6bbba71c 100644
--- a/lib/string-utils.ts
+++ b/lib/string-utils.ts
@@ -2,6 +2,10 @@
 // to facilitate ESM and Deno modules.
 // TODO: look at porting https://www.npmjs.com/package/wrap-ansi to ESM.
 
+// The current approach is to use the cjs version of the modules for node, and the esm version
+// for contexts which can import from URLs. This file could be deleted if/once we are happy with
+// the new approach.
+
 // The npm application
 // Copyright (c) npm, Inc. and Contributors
 // Licensed on the terms of The Artistic License 2.0
diff --git a/package.json b/package.json
index eab6bf47..194ced2f 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,10 @@
         "require": "./build/index.cjs"
       },
       "./build/index.cjs"
-    ]
+    ],
+    "./browser.mjs": {
+      "import": "./browser.mjs"
+    }
   },
   "type": "module",
   "module": "./index.mjs",
@@ -20,6 +23,7 @@
     "pretest": "rimraf build && tsc -p tsconfig.test.json && cross-env NODE_ENV=test npm run build:cjs",
     "test": "c8 mocha ./test/*.cjs",
     "test:esm": "c8 mocha ./test/esm/cliui-test.mjs",
+    "test:deno": "deno test ./test/deno/cliui-test.ts",
     "postest": "check",
     "coverage": "c8 report --check-coverage",
     "precompile": "rimraf build",
@@ -75,6 +79,7 @@
   "files": [
     "build",
     "index.mjs",
+    "browser.mjs",
     "!*.d.ts"
   ],
   "engines": {
diff --git a/test/deno/cliui-test.ts b/test/deno/cliui-test.ts
index ce24068d..de7b6c45 100644
--- a/test/deno/cliui-test.ts
+++ b/test/deno/cliui-test.ts
@@ -39,10 +39,11 @@ Deno.test('evenly divides text across columns if multiple columns are given', ()
   // TODO: we should flesh out the Deno and ESM implementation
   // such that it spreads words out over multiple columns appropriately:
   const expected = [
-    'i am a string ti am a seconi am a third',
-    'hat should be wd string tha string that',
-    'rapped         t should be  should be w',
-    '               wrapped     rapped'
+    'i am a string  i am a      i am a third',
+    'that should be second      string that',
+    'wrapped        string that should be',
+    '               should be   wrapped',
+    '               wrapped'
   ]
 
   ui.toString().split('\n').forEach((line: string, i: number) => {
diff --git a/test/esm/cliui-test.mjs b/test/esm/cliui-test.mjs
index f57d77d1..1e33e23e 100644
--- a/test/esm/cliui-test.mjs
+++ b/test/esm/cliui-test.mjs
@@ -35,11 +35,12 @@ describe('ESM', () => {
     // TODO: we should flesh out the Deno and ESM implementation
     // such that it spreads words out over multiple columns appropriately:
     const expected = [
-      'i am a string ti am a seconi am a third',
-      'hat should be wd string tha string that',
-      'rapped         t should be  should be w',
-      '               wrapped     rapped'
-    ]
+      'i am a string  i am a      i am a third',
+      'that should be second      string that',
+      'wrapped        string that should be',
+      '               should be   wrapped',
+      '               wrapped'
+  ]
     ui.toString().split('\n').forEach((line, i) => {
       strictEqual(line, expected[i])
     })