diff --git a/buildprocess/configureWebpack.js b/buildprocess/configureWebpack.js
index d51935f31fc..89633d0bf1d 100644
--- a/buildprocess/configureWebpack.js
+++ b/buildprocess/configureWebpack.js
@@ -8,6 +8,7 @@ const webpack = require("webpack");
  * Supplements the given webpack config with options required to build TerriaJS
  *
  * @param [options.terriaJSBasePath] The TerriaJS source directory
+ * @param [options.jsExtraPaths] Additional include paths for js/ts files.
  * @param [options.config] Base webpack configuration
  * @param [options.devMode] Set to `true` to generate for development build, default is `false`.
  * @param [options.MiniCssExtractPlugin]
@@ -15,6 +16,7 @@ const webpack = require("webpack");
  */
 function configureWebpack({
   terriaJSBasePath,
+  jsExtraPaths,
   config,
   devMode,
   MiniCssExtractPlugin,
@@ -64,10 +66,10 @@ function configureWebpack({
     include: [
       path.resolve(terriaJSBasePath, "node_modules", "commander"),
       path.resolve(terriaJSBasePath, "lib"),
-      path.resolve(terriaJSBasePath, "test"),
       path.resolve(terriaJSBasePath, "buildprocess", "generateDocs.ts"),
       path.resolve(terriaJSBasePath, "buildprocess", "generateCatalogIndex.ts"),
-      path.resolve(terriaJSBasePath, "buildprocess", "patchNetworkRequests.ts")
+      path.resolve(terriaJSBasePath, "buildprocess", "patchNetworkRequests.ts"),
+      ...jsExtraPaths
     ],
     use: [babelLoader]
   });
diff --git a/buildprocess/webpack-tools.config.js b/buildprocess/webpack-tools.config.js
index 2c78229ad9c..82586263678 100644
--- a/buildprocess/webpack-tools.config.js
+++ b/buildprocess/webpack-tools.config.js
@@ -59,8 +59,11 @@ module.exports = function () {
     }
   };
 
+  const terriaJSBasePath = path.dirname(require.resolve("../package.json"));
+  const jsExtraPaths = [path.resolve(terriaJSBasePath, "test")];
   return configureWebpackForTerriaJS({
-    terriaJSBasePath: path.dirname(require.resolve("../package.json")),
+    terriaJSBasePath,
+    jsExtraPaths,
     config,
     devMode,
     MiniCssExtractPlugin,
diff --git a/buildprocess/webpack.config.make.js b/buildprocess/webpack.config.make.js
index 20eb7787d75..906e0232113 100644
--- a/buildprocess/webpack.config.make.js
+++ b/buildprocess/webpack.config.make.js
@@ -63,8 +63,10 @@ module.exports = function (devMode) {
     }
   };
 
+  const jsExtraPaths = [path.resolve(terriaJSBasePath, "test")];
   return configureWebpack({
     terriaJSBasePath,
+    jsExtraPaths,
     config,
     devMode,
     MiniCssExtractPlugin