Initial commit.

Author: mbostock

.eslintrc.json

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+{
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 10
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "browser": true
+  },
+  "rules": {
+    "no-cond-assign": 0,
+    "no-constant-condition": 0
+  }
+}

.gitignore

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+.DS_Store
+dist/
+node_modules/

LICENSE

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+Copyright 2020 Observable, Inc.
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.

README.md

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+# Observable Plot
+
+**Observable Plot** is a JavaScript library for exploratory data visualization.

package.json

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+{
+  "name": "@observablehq/plot",
+  "version": "0.0.0",
+  "author": {
+    "name": "Observable, Inc.",
+    "url": "https://observablehq.com"
+  },
+  "license": "ISC",
+  "main": "dist/@observablehq/plot.cjs.js",
+  "unpkg": "dist/@observablehq/plot.umd.js",
+  "module": "src/index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/observablehq/plot.git"
+  },
+  "files": [
+    "dist/**/*.js",
+    "src/**/*.js"
+  ],
+  "scripts": {
+    "pretest": "rollup -c",
+    "test": "tape 'test/**/*-test.js' && eslint src test",
+    "prepublishOnly": "rm -rf dist && yarn test",
+    "postpublish": "git push && git push --tags && zip -j dist/${npm_package_name}.zip -- LICENSE README.md dist/${npm_package_name}.js dist/${npm_package_name}.min.js"
+  },
+  "devDependencies": {
+    "@rollup/plugin-node-resolve": "^10.0.0",
+    "eslint": "^7.12.1",
+    "jsdom": "^16.4.0",
+    "rollup": "^2.32.1",
+    "rollup-plugin-terser": "^7.0.2",
+    "tape": "^4.13.3",
+    "tape-await": "^0.1.2"
+  },
+  "dependencies": {
+    "d3-array": "^2.8.0",
+    "d3-axis": "^2.0.0",
+    "d3-interpolate": "^2.0.1",
+    "d3-scale": "^3.2.3",
+    "d3-selection": "^2.0.0",
+    "d3-shape": "^2.0.0"
+  }
+}

rollup.config.js

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+import {terser} from "rollup-plugin-terser";
+import * as meta from "./package.json";
+
+const external = Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key));
+
+const config = {
+  input: "src/index.js",
+  external,
+  output: {
+    indent: false,
+    banner: `// ${meta.name} v${meta.version} Copyright ${(new Date).getFullYear()} ${meta.author.name}`,
+  },
+  plugins: []
+};
+
+export default [
+  {
+    ...config,
+    output: {
+      ...config.output,
+      format: "cjs",
+      file: `dist/${meta.name}.cjs.js`
+    }
+  },
+  {
+    ...config,
+    output: {
+      ...config.output,
+      name: "Plot",
+      format: "umd",
+      extend: true,
+      file: `dist/${meta.name}.umd.js`,
+      globals: Object.fromEntries(external.map(key => [key, "d3"])),
+      paths: Object.fromEntries(external.map(key => [key, "d3@6"]))
+    },
+    plugins: [
+      ...config.plugins,
+      terser({
+        output: {
+          preamble: config.output.banner
+        }
+      })
+    ]
+  }
+];