conditionally set the 'mode' property in integration tests depending on webpack version

Author: johnnyreilly

test/integration/index.spec.js

@@ -6,6 +6,8 @@ var path = require('path');
 var webpack = require('webpack');
 var ForkTsCheckerWebpackPlugin = require('../../lib/index');
 
+var webpackMajorVersion = require('./webpackVersion')();
+
 describe('[INTEGRATION] index', function () {
   this.timeout(30000);
   var plugin;
@@ -18,7 +20,7 @@ describe('[INTEGRATION] index', function () {
         : { transpileOnly: true, silent: true };
 
     return webpack({
-      mode: 'development',
+      ...(webpackMajorVersion >= 4 ? { mode: 'development' } : {}),
       context: path.resolve(__dirname, './project'),
       entry: './src/index.ts',
       output: {

test/integration/vue.spec.js

@@ -8,6 +8,8 @@ var process = require('process');
 var ForkTsCheckerWebpackPlugin = require('../../lib/index');
 var IncrementalChecker = require('../../lib/IncrementalChecker');
 
+var webpackMajorVersion = require('./webpackVersion')();
+
 describe('[INTEGRATION] vue', function () {
   this.timeout(30000);
   process.setMaxListeners(20);   
@@ -20,7 +22,7 @@ describe('[INTEGRATION] vue', function () {
     plugin = new ForkTsCheckerWebpackPlugin(Object.assign({}, options, { silent: true }));
 
     compiler = webpack({
-      mode: 'development',
+      ...(webpackMajorVersion >= 4 ? { mode: 'development' } : {}),
       context: path.resolve(__dirname, './vue'),
       entry: './src/index.ts',
       output: {

test/integration/webpackVersion.js

@@ -0,0 +1,12 @@
+function getWebpackMajorVersion() {
+  // Determine major webpack version from package.json
+  var packageJson = require('../../package.json');
+  var webpackVersion = packageJson.devDependencies.webpack.replace(
+    /[^0-9.]/g,
+    ''
+  );
+  var webpackMajorVersion = parseInt(webpackVersion.split('.')[0], 10);
+  return webpackMajorVersion;
+}
+
+module.exports = getWebpackMajorVersion;