support for TypeScript dependencies

tests/samples/codefiles/typescript.ts

@@ -0,0 +1,37 @@
+import Alpha from './bravo'
+import { charlie, delta } from '../../echo/foxtrot'
+import golf from './hotel/india.js'
+import juliett from 'kilo'
+import {
+  lima,
+  mike,
+} from './november'
+import * from '/modules/oscar'
+import * as papa from 'quebec'
+import {romeo as sierra} from from 'tango.jsx'
+import 'uniform.js'
+import victorDefault, * as victorModule from '/modules/victor.js'
+import whiskeyDefault, {whiskeyOne, whiskeyTwo} from 'whiskey'
+
+const propTypes = {}
+
+const defaultProps = {}
+
+class Link extends Alpha.Component {
+  static method() {
+    return true
+  }
+
+  render() {
+    return (
+      <a href={this.props.url} data-id={this.props.id}>
+        {this.props.text}
+      </a>
+    )
+  }
+}
+
+Link.propTypes = propTypes
+Link.defaultProps = defaultProps
+
+export default Link

tests/test_dependencies.py

@@ -377,3 +377,23 @@ class DependenciesTestCase(TestCase):
             expected_lines=37,
             entity='es6.js',
         )
+
+    def test_typescript_dependencies_detected(self):
+        self.shared(
+            expected_dependencies=[
+                'bravo',
+                'foxtrot',
+                'india',
+                'kilo',
+                'november',
+                'oscar',
+                'quebec',
+                'tango',
+                'uniform',
+                'victor',
+                'whiskey',
+            ],
+            expected_language='TypeScript',
+            expected_lines=37,
+            entity='typescript.ts',
+        )

wakatime/dependencies/__init__.py

@@ -123,8 +123,6 @@ class DependencyParser(object):
 
     @property
     def root_lexer(self):
-        if not self.lexer:
-            return None
         if hasattr(self.lexer, 'root_lexer'):
             return self.lexer.root_lexer
         return self.lexer

wakatime/dependencies/javascript.py

@@ -54,3 +54,7 @@ class JavascriptParser(TokenParser):
         content = content.split('/')[-1].split('\\')[-1]
         content = self.extension.sub('', content, count=1)
         return content
+
+
+class TypeScriptParser(JavascriptParser):
+    pass