Adopt type=module

.eslintrc.json

@@ -3,13 +3,5 @@
   "parserOptions": {
     "sourceType": "module",
     "ecmaVersion": 8
-  },
-  "env": {
-    "es6": true,
-    "node": true,
-    "browser": true
-  },
-  "rules": {
-    "no-cond-assign": 0
   }
 }

.github/eslint.json

@@ -0,0 +1,18 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "eslint-compact",
+      "pattern": [
+        {
+          "regexp": "^(.+):\\sline\\s(\\d+),\\scol\\s(\\d+),\\s(Error|Warning|Info)\\s-\\s(.+)\\s\\((.+)\\)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "severity": 4,
+          "message": 5,
+          "code": 6
+        }
+      ]
+    }
+  ]
+}

.github/workflows/node.js.yml

@@ -0,0 +1,30 @@
+# https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: yarn --frozen-lockfile
+    - run: |
+        echo ::add-matcher::.github/eslint.json
+        yarn run eslint src test --format=compact
+    - run: yarn test

LICENSE

@@ -1,39 +1,23 @@
-Copyright 2010-2018 Mike Bostock
-All rights reserved.
+Copyright 2010-2021 Mike Bostock
 
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
+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.
 
-* Redistributions of source code must retain the above copyright notice, this
-  list of conditions and the following disclaimer.
+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.
 
-* Redistributions in binary form must reproduce the above copyright notice,
-  this list of conditions and the following disclaimer in the documentation
-  and/or other materials provided with the distribution.
+Apache-Style Software License for ColorBrewer software and ColorBrewer Color Schemes
 
-* Neither the name of the author nor the names of contributors may be used to
-  endorse or promote products derived from this software without specific prior
-  written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-Apache-Style Software License for ColorBrewer software and ColorBrewer Color
-Schemes
-
-Copyright (c) 2002 Cynthia Brewer, Mark Harrower, and The Pennsylvania State
-University.
+Copyright 2002 Cynthia Brewer, Mark Harrower, and The Pennsylvania State University
 
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use
-this file except in compliance with the License.  You may obtain a copy of the
+this file except in compliance with the License. You may obtain a copy of the
 License at
 
 http://www.apache.org/licenses/LICENSE-2.0

README.md

@@ -22,30 +22,31 @@ var piyg = d3.scaleSequential(d3.interpolatePiYG);
 
 ## Installing
 
-If you use NPM, `npm install d3-scale-chromatic`. Otherwise, download the [latest release](https://github.com/d3/d3-scale-chromatic/releases/latest) or load directly from [d3js.org](https://d3js.org) as a [standalone library](https://d3js.org/d3-scale-chromatic.v1.min.js). AMD, CommonJS, and vanilla environments are supported. In vanilla, a `d3` global is exported:
+If you use npm, `npm install d3-scale-chromatic`. You can also download the [latest release on GitHub](https://github.com/d3/d3-scale-chromatic/releases/latest). For vanilla HTML in modern browsers, import d3-scale-chromatic from Skypack:
 
 ```html
-<script src="https://d3js.org/d3-color.v2.min.js"></script>
-<script src="https://d3js.org/d3-interpolate.v2.min.js"></script>
-<script src="https://d3js.org/d3-scale-chromatic.v2.min.js"></script>
-<script>
+<script type="module">
+
+import {interpolateYlGn} from "https://cdn.skypack.dev/d3-scale-chromatic@3";
 
-var yellow = d3.interpolateYlGn(0), // "rgb(255, 255, 229)"
-    yellowGreen = d3.interpolateYlGn(0.5), // "rgb(120, 197, 120)"
-    green = d3.interpolateYlGn(1); // "rgb(0, 69, 41)"
+const yellow = interpolateYlGn(0); // "rgb(255, 255, 229)"
+const yellowGreen = interpolateYlGn(0.5); // "rgb(120, 197, 120)"
+const green = interpolateYlGn(1); // "rgb(0, 69, 41)"
 
 </script>
 ```
 
-Or, as part of the [D3 default bundle](https://github.com/d3/d3):
+For legacy environments, you can load d3-scale-chromatic’s UMD bundle from an npm-based CDN such as jsDelivr; a `d3` global is exported:
 
 ```html
-<script src="https://d3js.org/d3.v6.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/d3-color@3"></script>
+<script src="https://cdn.jsdelivr.net/npm/d3-interpolate@3"></script>
+<script src="https://cdn.jsdelivr.net/npm/d3-scale-chromatic@3"></script>
 <script>
 
-var yellow = d3.interpolateYlGn(0), // "rgb(255, 255, 229)"
-    yellowGreen = d3.interpolateYlGn(0.5), // "rgb(120, 197, 120)"
-    green = d3.interpolateYlGn(1); // "rgb(0, 69, 41)"
+const yellow = d3.interpolateYlGn(0); // "rgb(255, 255, 229)"
+const yellowGreen = d3.interpolateYlGn(0.5); // "rgb(120, 197, 120)"
+const green = d3.interpolateYlGn(1); // "rgb(0, 69, 41)"
 
 </script>
 ```

package.json

@@ -2,6 +2,11 @@
   "name": "d3-scale-chromatic",
   "version": "2.0.0",
   "description": "Sequential, diverging and categorical color schemes.",
+  "homepage": "https://d3js.org/d3-scale-chromatic/",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/d3/d3-scale-chromatic.git"
+  },
   "keywords": [
     "d3",
     "d3-module",
@@ -10,39 +15,41 @@
     "sequential",
     "colorbrewer"
   ],
-  "homepage": "https://d3js.org/d3-scale-chromatic/",
-  "license": "BSD-3-Clause",
+  "license": "ISC",
   "author": {
     "name": "Mike Bostock",
-    "url": "http://bost.ocks.org/mike"
-  },
-  "main": "dist/d3-scale-chromatic.js",
-  "unpkg": "dist/d3-scale-chromatic.min.js",
-  "jsdelivr": "dist/d3-scale-chromatic.min.js",
-  "module": "src/index.js",
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/d3/d3-scale-chromatic.git"
+    "url": "https://bost.ocks.org/mike"
   },
+  "type": "module",
   "files": [
     "dist/**/*.js",
     "src/**/*.js"
   ],
-  "sideEffects": false,
-  "scripts": {
-    "pretest": "rollup -c",
-    "test": "tape 'test/**/*-test.js' && eslint src",
-    "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 ${npm_package_name}.v${npm_package_version%%.*}.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git add ${npm_package_name}.v${npm_package_version%%.*}.js ${npm_package_name}.v${npm_package_version%%.*}.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"
+  "module": "src/index.js",
+  "main": "src/index.js",
+  "jsdelivr": "dist/d3-scale-chromatic.min.js",
+  "unpkg": "dist/d3-scale-chromatic.min.js",
+  "exports": {
+    "umd": "./dist/d3-scale-chromatic.min.js",
+    "default": "./src/index.js"
   },
+  "sideEffects": false,
   "dependencies": {
-    "d3-color": "1 - 2",
-    "d3-interpolate": "1 - 2"
+    "d3-color": "1 - 3",
+    "d3-interpolate": "1 - 3"
   },
   "devDependencies": {
-    "eslint": "6",
-    "rollup": "1",
-    "rollup-plugin-terser": "5",
-    "tape": "4"
+    "eslint": "7",
+    "mocha": "8",
+    "rollup": "2",
+    "rollup-plugin-terser": "7"
+  },
+  "scripts": {
+    "test": "mocha 'test/**/*-test.js' && eslint src test",
+    "prepublishOnly": "rm -rf dist && yarn test && rollup -c",
+    "postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../${npm_package_name}/dist/${npm_package_name}.js ${npm_package_name}.v${npm_package_version%%.*}.js && cp ../${npm_package_name}/dist/${npm_package_name}.min.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git add ${npm_package_name}.v${npm_package_version%%.*}.js ${npm_package_name}.v${npm_package_version%%.*}.min.js && git commit -m \"${npm_package_name} ${npm_package_version}\" && git push && cd -"
+  },
+  "engines": {
+    "node": ">=12"
   }
 }

rollup.config.js

@@ -1,6 +1,14 @@
+import {readFileSync} from "fs";
 import {terser} from "rollup-plugin-terser";
 import * as meta from "./package.json";
 
+// Extract copyrights from the LICENSE.
+const copyright = readFileSync("./LICENSE", "utf-8")
+  .split(/\n/g)
+  .filter(line => /^Copyright\s+/.test(line))
+  .map(line => line.replace(/^Copyright\s+/, ""))
+  .join("; ");
+
 const config = {
   input: "src/index.js",
   external: Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)),
@@ -10,7 +18,7 @@ const config = {
     format: "umd",
     indent: false,
     extend: true,
-    banner: `// ${meta.homepage} v${meta.version} Copyright ${(new Date).getFullYear()} ${meta.author.name}`,
+    banner: `// ${meta.homepage} v${meta.version} Copyright ${copyright}`,
     globals: Object.assign({}, ...Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)).map(key => ({[key]: "d3"})))
   },
   plugins: []

test/.eslintrc.json

@@ -0,0 +1,10 @@
+{
+  "extends": "eslint:recommended",
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 8
+  },
+  "env": {
+    "mocha": true
+  }
+}

test/index-test.js

@@ -1,8 +1,8 @@
-var tape = require("tape"),
-    d3 = require("../");
+import assert from "assert";
+import * as d3 from "../src/index.js";
 
-tape("exports the expected schemes", function(test) {
-  test.deepEqual(Object.keys(d3).sort(), [
+it("exports the expected schemes", () => {
+  assert.deepStrictEqual(Object.keys(d3).sort(), [
     "interpolateBlues",
     "interpolateBrBG",
     "interpolateBuGn",
@@ -79,5 +79,4 @@ tape("exports the expected schemes", function(test) {
     "schemeYlOrBr",
     "schemeYlOrRd"
   ]);
-  test.end();
 });