Add webpack build system for global lib build

.npmignore

@@ -0,0 +1 @@
+lib

package.json

@@ -12,7 +12,8 @@
   "types": "dist/index.d.ts",
   "scripts": {
     "test": "jest",
-    "build": "rm -rf dist && tsc"
+    "bundle": "rm -rf lib && webpack --config ./webpack/lib.config.ts && webpack --config ./webpack/lib.min.config.ts",
+    "build": "rm -rf dist && tsc && yarn bundle"
   },
   "devDependencies": {
     "@types/jest": "^24.0.3",
@@ -21,8 +22,11 @@
     "prando": "^5.1.0",
     "prettier": "^1.16.4",
     "ts-jest": "^23.10.5",
+    "ts-loader": "^5.3.3",
     "ts-node": "^8.0.2",
-    "typescript": "^3.2.4"
+    "typescript": "^3.2.4",
+    "webpack": "^4.29.5",
+    "webpack-cli": "^3.2.3"
   },
   "dependencies": {},
   "publishConfig": {

src/lib.ts

@@ -0,0 +1,14 @@
+/* Copyright 2019 Google Inc. All Rights Reserved.
+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 License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+import { UMAP } from './umap';
+(window as any).UMAP = UMAP;

webpack/lib.config.ts

@@ -0,0 +1,25 @@
+import * as path from 'path';
+
+export default {
+  mode: 'production',
+  module: {
+    rules: [
+      {
+        test: /\.ts$/,
+        exclude: /node_modules/,
+        use: 'ts-loader',
+      },
+    ],
+  },
+  resolve: {
+    extensions: ['.ts'],
+  },
+  entry: {
+    lib: './src/lib.ts',
+  },
+  output: {
+    filename: 'umap-js.js',
+    path: path.resolve(__dirname, '../lib'),
+  },
+  optimization: { minimize: false },
+};

webpack/lib.min.config.ts

@@ -0,0 +1,10 @@
+import libConfig from './lib.config';
+
+export default {
+  ...libConfig,
+  output: {
+    ...libConfig.output,
+    filename: 'umap-js.min.js',
+  },
+  optimization: { minimize: true },
+};