setup Karma config

.gitignore

@@ -2,7 +2,6 @@ node_modules/
 dist/
 dist.es5/
 build/
-package-lock.json
 .nyc_output/
 coverage/
 benchmark/sandbox.ts

.travis.yml

@@ -1,10 +1,17 @@
+# https://docs.travis-ci.com/user/languages/javascript-with-nodejs/
 language: node_js
+addons:
+  firefox: latest
 node_js:
-  - "10"
-  - "12"
+  - "lts/*"
+  - "node"
 cache: npm
-before_install: npm install -g nyc codecov
-script: npm run test:cover
+install:
+  - npm install -g nyc codecov
+  - npm ci
+script:
+  - npm run test:browser:firefox
+  - npm run test:cover
 after_success:
   - nyc report --reporter=json > coverage/coverage.json
   - codecov

karma.conf.ts

@@ -0,0 +1,61 @@
+const webpackConfig = require("./webpack.config.js");
+
+export default function configure(config: any) {
+  config.set({
+    browsers: ["FirefoxHeadless", "ChromeHeadless"],
+
+    basePath: "",
+    frameworks: ["mocha"],
+    files: ["./test/karma-run.ts"],
+    exclude: [],
+    preprocessors: {
+      "**/*.ts": ["webpack", "sourcemap"],
+    },
+    reporters: ["mocha"],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_INFO,
+    autoWatch: true,
+    singleRun: false,
+    concurrency: 2,
+
+    webpack: {
+      mode: "development",
+
+      // Handles NodeJS polyfills
+      // https://webpack.js.org/configuration/node
+      // Note that the dependencies in https://github.com/webpack/node-libs-browser are sometimes too old.
+      node: {
+        assert: false,
+        util: false,
+        buffer: false,
+      },
+      resolve: {
+        ...webpackConfig.resolve,
+        alias: {
+          assert$: "assert/assert.js",
+        },
+      },
+      module: {
+        rules: [
+          {
+            test: /\.tsx?$/,
+            loader: "ts-loader",
+            options: {
+              configFile: "tsconfig.karma.json",
+              // FIXME: some types for dependencies cannot be resolved, so ignore type checking for now.
+              transpileOnly: true,
+            },
+          },
+        ],
+      },
+      optimization: {
+        minimize: false,
+      },
+      devtool: "inline-source-map",
+    },
+    mime: {
+      "text/x-typescript": ["ts", "tsx"],
+    },
+  });
+}