docs(config): fix typescript setup in configuration-languages (#1734)

Resolves #1735

Author: youta1119

src/content/configuration/configuration-languages.md

@@ -7,6 +7,7 @@ contributors:
   - tarang9211
   - simon04
   - peterblazejewicz
+  - youta1119
 ---
 
 webpack accepts configuration files written in multiple programming and data languages. The list of supported file extensions can be found at the [node-interpret](https://github.com/js-cli/js-interpret) package. Using [node-interpret](https://github.com/js-cli/js-interpret), webpack can handle many different types of configuration files.
@@ -39,6 +40,48 @@ const config: webpack.Configuration = {
 export default config;
 ```
 
+Not that you'll also need to check your `tsconfig.json` file. If the module in `compilerOptions` in `tsconfig.json` is `commonjs`, the setting is complete, else webpack will fail with an error. This occurs because `ts-node` does not support any module syntax other than `commonjs`.
+
+There are two solutions to this issue:
+
+- Modify `tsconfig.json`.
+- Install `tsconfig-paths`.
+
+The __first option__ is to open your `tsconfig.json` file and look for `compilerOptions`. Set `target` to `"ES5"` and `module` to `"CommonJS"` (or completely remove the `module` option).
+
+The __second option__ is to install the `tsconfig-paths` package:
+
+``` bash
+npm install --save-dev tsconfig-paths
+```
+
+And create a separate TypeScript configuration specifically for your webpack configs:
+
+__tsconfig-for-webpack-config.json__
+
+``` json
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5"
+  }
+}
+```
+
+T> `ts-node` can resolve a `tsconfig.json` file using the environment variable provided by `tsconfig-path`.
+
+Then set the environment variable `process.env.TS_NODE_PROJECT` provided by `tsconfig-path` like so:
+
+__package.json__
+
+```json
+{
+  "scripts": {
+    "build": "TS_NODE_PROJECT=\"tsconfig-for-webpack-config.json\" webpack"
+  }
+}
+```
+
 
 ## CoffeeScript