diff --git a/karma.conf.js b/karma.conf.js
index e5bcbccdf..35515414a 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -1,23 +1,23 @@
-const path = require('path')
-const webpack = require('webpack')
-const webpackConfig = require('./webpack.config')[0]
+const path = require("path");
+const webpack = require("webpack");
+const webpackConfig = require("./webpack.config")[0];
 
-process.env.CHROME_BIN = require('puppeteer').executablePath()
+process.env.CHROME_BIN = require("puppeteer").executablePath();
 
 module.exports = function(config) {
   config.set({
     // base path that will be used to resolve all patterns (eg. files, exclude)
-    basePath: '',
+    basePath: "",
 
     // frameworks to use
     // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
-    frameworks: ['mocha', 'sinon-chai'],
+    frameworks: ["mocha", "sinon-chai"],
 
     // list of files / patterns to load in the browser
-    files: ['src/internal/compat.ts', 'test/unit/**/*_test.ts'],
+    files: ["test/unit/**/*_test.ts"],
 
     mime: {
-      'text/x-typescript': ['ts', 'tsx']
+      "text/x-typescript": ["ts", "tsx"]
     },
 
     // list of files to exclude
@@ -26,7 +26,7 @@ module.exports = function(config) {
     // preprocess matching files before serving them to the browser
     // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
     preprocessors: {
-      '**/*.ts': ['webpack', 'sourcemap']
+      "**/*.ts": ["webpack", "sourcemap"]
     },
 
     webpack: {
@@ -34,11 +34,11 @@ module.exports = function(config) {
       module: webpackConfig.module,
       externals: webpackConfig.externals,
 
-      devtool: 'inline-source-map',
+      devtool: "inline-source-map",
 
       plugins: [
         new webpack.DefinePlugin({
-          VERSION: '"1.0.0"'
+          VERSION: '"0.0.0"'
         }),
         new webpack.SourceMapDevToolPlugin({
           filename: null,
@@ -48,13 +48,13 @@ module.exports = function(config) {
     },
 
     webpackMiddleware: {
-      stats: 'errors-only'
+      stats: "errors-only"
     },
 
     // test results reporter to use
     // possible values: 'dots', 'progress'
     // available reporters: https://npmjs.org/browse/keyword/karma-reporter
-    reporters: ['spec'],
+    reporters: ["spec"],
 
     // web server port
     port: 9876,
@@ -71,7 +71,7 @@ module.exports = function(config) {
 
     // start these browsers
     // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
-    browsers: ['ChromeHeadless'],
+    browsers: ["ChromeHeadless"],
 
     // Continuous Integration mode
     // if true, Karma captures browsers, runs the tests and exits
@@ -80,5 +80,5 @@ module.exports = function(config) {
     // Concurrency level
     // how many browser should be started simultaneous
     concurrency: 1
-  })
-}
+  });
+};
diff --git a/package.json b/package.json
index 63e807c35..2668ca364 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "notifier"
   ],
   "peerDependencies": {
-    "cross-fetch": "2.2.x"
+    "cross-fetch": ">=2"
   },
   "devDependencies": {
     "@types/chai": "4.1.7",