diff --git a/server/middleware/FileUtils.js b/server/middleware/FileUtils.js
index 67c068c..f4c5efd 100644
--- a/server/middleware/FileUtils.js
+++ b/server/middleware/FileUtils.js
@@ -4,7 +4,7 @@ const mime = require('mime')
 const TextFiles = /\/?(\.[a-z]*rc|\.git[a-z]*|\.[a-z]*ignore)$/i
 
 mime.define({
-  'text/plain': ['license', 'readme', 'changes', 'authors', 'makefile'],
+  'text/plain': ['license', 'readme', 'changes', 'authors', 'makefile', 'ts'],
 })
 
 const getContentType = (file) =>
diff --git a/server/middleware/FileUtils.test.js b/server/middleware/FileUtils.test.js
index 7b97d5d..a051b09 100644
--- a/server/middleware/FileUtils.test.js
+++ b/server/middleware/FileUtils.test.js
@@ -22,4 +22,9 @@ it('gets a contextType of text/plain for .git* files', () => {
 it('gets a contextType of text/plain for .*ignore files', () => {
   expect(getContentType('.eslintignore')).toBe('text/plain');
   expect(getContentType('.anythingignore')).toBe('text/plain');
+});
+
+it('gets a contextType of text/plain for .ts files', () => {
+  expect(getContentType('app.ts')).toBe('text/plain');
+  expect(getContentType('app.d.ts')).toBe('text/plain');
 });
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