Move index; add unpkg & jsdelivr fields.

package.json

@@ -16,16 +16,17 @@
     "name": "Mike Bostock",
     "url": "http://bost.ocks.org/mike"
   },
-  "main": "dist/d3-polygon.min.js",
-  "module": "index",
-  "jsnext:main": "index",
+  "main": "dist/d3-polygon.js",
+  "unpkg": "dist/d3-polygon.min.js",
+  "jsdelivr": "dist/d3-polygon.min.js",
+  "module": "src/index.js",
   "repository": {
     "type": "git",
     "url": "https://github.com/d3/d3-polygon.git"
   },
   "scripts": {
     "pretest": "rollup -c",
-    "test": "tape 'test/**/*-test.js' && eslint index.js src test",
+    "test": "tape 'test/**/*-test.js' && eslint src test",
     "prepublishOnly": "rm -rf dist && yarn test",
     "postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../${npm_package_name}/dist/${npm_package_name}.js ${npm_package_name}.v1.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v1.min.js && git add ${npm_package_name}.v1.js ${npm_package_name}.v1.min.js && git commit -m \"${npm_package_name} ${npm_package_version}\" && git push && cd - && zip -j dist/${npm_package_name}.zip -- LICENSE README.md dist/${npm_package_name}.js dist/${npm_package_name}.min.js"
   },

rollup.config.js

@@ -2,16 +2,16 @@ import {terser} from "rollup-plugin-terser";
 import * as meta from "./package.json";
 
 const config = {
-  input: "index.js",
-  external: Object.keys(meta.dependencies || {}),
+  input: "src/index.js",
+  external: Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)),
   output: {
     file: `dist/${meta.name}.js`,
     name: "d3",
     format: "umd",
     indent: false,
     extend: true,
     banner: `// ${meta.homepage} v${meta.version} Copyright ${(new Date).getFullYear()} ${meta.author.name}`,
-    globals: Object.assign({}, ...Object.keys(meta.dependencies || {}).map(key => ({[key]: "d3"})))
+    globals: Object.assign({}, ...Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)).map(key => ({[key]: "d3"})))
   },
   plugins: []
 };

src/index.js

@@ -0,0 +1,5 @@
+export {default as polygonArea} from "./area";
+export {default as polygonCentroid} from "./centroid";
+export {default as polygonHull} from "./hull";
+export {default as polygonContains} from "./contains";
+export {default as polygonLength} from "./length";