Add Rollup.

Author: mbostock

package.json

@@ -12,7 +12,8 @@
   },
   "scripts": {
     "test": "tape -r esm 'test/**/*-test.js'",
-    "precommit": "eslint . && yarn test"
+    "precommit": "eslint . && yarn test",
+    "prepare": "rollup -c"
   },
   "esm": {
     "mode": "all",
@@ -26,6 +27,8 @@
     "eslint": "^4.12.1",
     "husky": "^0.14.3",
     "jsdom": "^11.6.2",
+    "rollup": "^0.52.0",
+    "rollup-plugin-node-resolve": "^3.0.0",
     "tape": "^4.9.0",
     "tape-await": "0.1.0"
   }

rollup.config.js

@@ -0,0 +1,14 @@
+import node from "rollup-plugin-node-resolve";
+
+export default {
+  input: "src/index.js",
+  plugins: [
+    node()
+  ],
+  output: {
+    banner: `// @observablehq/notebook-stdlib Copyright ${(new Date).getFullYear()} Observable, Inc.`,
+    file: "build/notebook-stdlib.js",
+    format: "umd",
+    name: "O"
+  }
+};

yarn.lock

@@ -150,6 +150,10 @@ browser-process-hrtime@^0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/browser-process-hrtime/-/browser-process-hrtime-0.1.2.tgz#425d68a58d3447f02a04aa894187fce8af8b7b8e"
 
+builtin-modules@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-2.0.0.tgz#60b7ef5ae6546bd7deefa74b08b62a43a232648e"
+
 caller-path@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/caller-path/-/caller-path-0.1.0.tgz#94085ef63581ecd3daa92444a8fe94e82577751f"
@@ -713,6 +717,10 @@ is-function@~1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-function/-/is-function-1.0.1.tgz#12cfb98b65b57dd3d193a3121f5f6e2f437602b5"
 
+is-module@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-module/-/is-module-1.0.0.tgz#3258fb69f78c14d5b815d664336b4cffb6441591"
+
 is-path-cwd@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-path-cwd/-/is-path-cwd-1.0.0.tgz#d225ec23132e89edd38fda767472e62e65f1106d"
@@ -1091,6 +1099,12 @@ resolve-from@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-1.0.1.tgz#26cbfe935d1aeeeabb29bc3fe5aeb01e93d44226"
 
+resolve@^1.1.6:
+  version "1.7.1"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.7.1.tgz#aadd656374fd298aee895bc026b8297418677fd3"
+  dependencies:
+    path-parse "^1.0.5"
+
 resolve@~1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.5.0.tgz#1f09acce796c9a762579f31b2c1cc4c3cddf9f36"
@@ -1116,6 +1130,18 @@ rimraf@^2.2.8:
   dependencies:
     glob "^7.0.5"
 
+rollup-plugin-node-resolve@^3.0.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-node-resolve/-/rollup-plugin-node-resolve-3.3.0.tgz#c26d110a36812cbefa7ce117cadcd3439aa1c713"
+  dependencies:
+    builtin-modules "^2.0.0"
+    is-module "^1.0.0"
+    resolve "^1.1.6"
+
+rollup@^0.52.0:
+  version "0.52.3"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.52.3.tgz#020d99fffe9619351e47b3894fd397c26f5e1bf6"
+
 run-async@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/run-async/-/run-async-2.3.0.tgz#0371ab4ae0bdd720d4166d7dfda64ff7a445a6c0"