diff --git a/package.json b/package.json
index 526141a..f54cfd0 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,11 @@
   "main": "dist/geo-albers-usa-territories.js",
   "scripts": {
     "prepublish": "rollup --config",
-    "postpublish": "git push && git push --tags"
+    "postpublish": "git push && git push --tags",
+    "prettier": "prettier './src/**/*.js' 'rollup.config.js' --write"
+  },
+  "prettier": {
+    "singleQuote": true
   },
   "repository": {
     "type": "git",
@@ -31,8 +35,11 @@
   },
   "homepage": "https://github.com/stamen/geo-albers-usa-territories#readme",
   "devDependencies": {
+    "@rollup/plugin-node-resolve": "^9.0.0",
+    "d3-geo": "^2.0.1",
+    "prettier": "^2.1.1",
     "rollup": "^2.26.11",
-    "d3-geo": "^2.0.1"
+    "rollup-plugin-commonjs": "^10.1.0"
   },
   "peerDependencies": {
     "d3-geo": "^2.0.1"
diff --git a/rollup.config.js b/rollup.config.js
index 26e450e..949e580 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,12 +1,18 @@
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+import commonjs from 'rollup-plugin-commonjs';
+
 export default {
   input: 'src/index.js',
-  external: ['d3-geo'],
   output: {
     file: 'dist/geo-albers-usa-territories.js',
     format: 'umd',
     name: 'geoAlbersUsaTerritories',
-    globals: {
-      'd3-geo': 'd3'
-    }
-  }
+  },
+  //  external: ['d3-geo', 'd3-geo/src/fit.js'],
+  plugins: [
+    nodeResolve(),
+    commonjs({
+      include: 'node_modules/**',
+    }),
+  ],
 };
diff --git a/src/index.js b/src/index.js
index 47ead18..3342c70 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,5 @@
 import { geoAlbers, geoConicEqualArea } from 'd3-geo';
+import { fitExtent, fitSize, fitWidth, fitHeight } from 'd3-geo/src/fit.js';
 
 var epsilon = 0.000001;
 
@@ -186,6 +187,22 @@ export function geoAlbersUsaTerritories() {
     return reset();
   };
 
+  albersUsaTerritories.fitExtent = function (extent, object) {
+    return fitExtent(albersUsaTerritories, extent, object);
+  };
+
+  albersUsaTerritories.fitSize = function (size, object) {
+    return fitSize(albersUsaTerritories, size, object);
+  };
+
+  albersUsaTerritories.fitWidth = function (width, object) {
+    return fitWidth(albersUsaTerritories, width, object);
+  };
+
+  albersUsaTerritories.fitHeight = function (height, object) {
+    return fitHeight(albersUsaTerritories, height, object);
+  };
+
   function reset() {
     cache = cacheStream = null;
     return albersUsaTerritories;