diff --git a/karma.conf.js b/karma.conf.js
index b2cf910..a7a4e63 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -42,7 +42,10 @@ module.exports = function (config) {
     customLaunchers: browserstack,
     karmaTypescriptConfig: {
       coverageOptions: {
-        exclude: /^src{\/|\\}test{\/|\\}/,
+        exclude: /test\//,
+      },
+      compilerOptions: {
+        module: 'commonjs'
       },
       tsconfig: './tsconfig.json',
       include: {
diff --git a/package-lock.json b/package-lock.json
index c97be9e..b3135d5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9268,6 +9268,12 @@
       "integrity": "sha512-tdzBRDGWcI1OpPVmChbdSKhvSVurznZ8X36AYURAcl+0o2ldlCY2XPzyXNNxwJwwyIU+rIglTCG4kxtNKBQH7Q==",
       "dev": true
     },
+    "tsconfigs": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/tsconfigs/-/tsconfigs-4.0.2.tgz",
+      "integrity": "sha512-Po+Hqetcu0P83zy6WHpT0bJIpXgKS+/N5mtiSpzxcTdjUbPNE2kijqUCZecwERHkVQt/mqNC6xzj/C92hs40qg==",
+      "dev": true
+    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
diff --git a/package.json b/package.json
index d3b8e82..f88bb49 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "npm-run-all": "^4.1.5",
     "remark-cli": "^7.0.1",
     "remark-toc": "^6.0.0",
+    "tsconfigs": "^4.0.2",
     "typescript": "^3.7.2",
     "xyz": "2.1.0"
   },
@@ -52,8 +53,8 @@
     "unit": "karma start",
     "test": "run-s lint compile unit",
     "compile": "npm run compile-es && npm run compile-commonjs",
-    "compile-es": "tsc --outDir es --module es6 --moduleResolution node",
-    "compile-commonjs": "tsc --outDir ./",
+    "compile-es": "tsc --outDir es --module es6",
+    "compile-commonjs": "tsc --outDir . --module commonjs",
     "prepublishOnly": "npm run compile",
     "release-major": "xyz --repo git@github.com:paldepind/snabbdom.git --increment major",
     "release-minor": "xyz --repo git@github.com:paldepind/snabbdom.git --increment minor",
diff --git a/tsconfig.json b/tsconfig.json
index ac45b4c..2002e08 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,15 +1,12 @@
 {
+    "extends": "tsconfigs/browser-module",
     "compilerOptions": {
+        "strictFunctionTypes": false,
+        "strictBindCallApply": false,
+        "noImplicitThis": false,
         "target": "ES5",
-        "noImplicitAny": true,
-        "sourceMap": true,
-        "strictNullChecks": true,
-        "declaration": true,
-        "removeComments": false,
-        "noUnusedLocals": true,
         "jsx": "react",
         "jsxFactory": "jsx",
-        "esModuleInterop": true,
         "lib": [
             "dom",
             "es5",