diff --git a/README.md b/README.md
index 73fa3b6..fc65c90 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ By default the plugin will look for a `webpack.config.js` in the service root. Y
 custom:
   webpack:
     config: ./path/to/config/file.js
+    typescript: true # set to true if your project uses TypeScript and have configured the appropriate Webpack loader, defaults to false
 ```
 
 The `entry` and `output` objects are set by the plugin.
diff --git a/src/index.js b/src/index.js
index 01c51fe..255861d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -61,7 +61,8 @@ class ServerlessPluginWebpack {
       webpackConfig,
       this.originalServicePath,
       webpackDefaultOutput,
-      webpackFolder
+      webpackFolder,
+      this.custom.typescript,
     ));
   }
 
diff --git a/src/lib/service.js b/src/lib/service.js
index 90992d7..eafbe8c 100644
--- a/src/lib/service.js
+++ b/src/lib/service.js
@@ -12,13 +12,13 @@ const setPackage = R.pipe(
   R.assoc('individually', true)
 );
 
-const fnPath = R.compose(R.replace(/\.[^.]+$/, '.js'), R.prop('handler'));
+const fnPath = extension => R.compose(R.replace(/\.[^.]+$/, extension), R.prop('handler'));
 
 const setFnsPackage = R.map(R.pipe(
   R.when(R.prop('package'), R.over(R.lensProp('package'), makePackageRelative)),
   R.converge(
     R.over(R.lensPath(['package', 'include'])),
-    [R.compose(R.append, fnPath), R.identity]
+    [R.compose(R.append, fnPath('.js')), R.identity]
   )
 ));
 
diff --git a/src/lib/wpack.js b/src/lib/wpack.js
index 6310cfc..8f6f88a 100644
--- a/src/lib/wpack.js
+++ b/src/lib/wpack.js
@@ -7,14 +7,15 @@ const service = require('./service');
  * Sets webpack entry
  * @param {object} fn Serverless function object
  * @param {string} servicePath Serverless service path
+ * @param {boolean} useTypeScript Use .ts extension
  * @returns {object} Webpack configuration
  */
-const setEntry = (fn, servicePath) =>
+const setEntry = (fn, servicePath, useTypeScript) =>
   R.assoc(
     'entry',
     R.objOf(
-      service.fnPath(fn),
-      path.join(servicePath, service.fnPath(fn))
+      service.fnPath('.js')(fn),
+      path.join(servicePath, service.fnPath(useTypeScript ? '.ts' : '.js')(fn))
     )
   );
 
@@ -40,13 +41,14 @@ const setOutput = (defaultOutput, outputPath) =>
  * @param {string} servicePath Serverless service path
  * @param {object} defaultOutput Webpack default output object
  * @param {string} folder Webpack output folder
+ * @param {boolean} useTypeScript Use .ts extension
  * @returns {array} Array of webpack configurations
  */
-const createConfigs = (fns, config, servicePath, defaultOutput, folder) =>
+const createConfigs = (fns, config, servicePath, defaultOutput, folder, useTypeScript) =>
   R.map(
     fn =>
       R.pipe(
-        setEntry(fn, servicePath),
+        setEntry(fn, servicePath, useTypeScript),
         setOutput(defaultOutput, path.join(servicePath, folder))
       )(config),
     R.values(fns)