Do not resolve .d.ts files

.gitignore

@@ -1,4 +1,4 @@
-node_modules
+/node_modules
 dist
 src/*.js
 test/sample/**/*.js

src/index.ts

@@ -3,6 +3,7 @@ import { createFilter } from 'rollup-pluginutils';
 import { statSync } from 'fs';
 import assign from 'object-assign';
 
+import { endsWith } from './string';
 import fixExportClass from './fixExportClass';
 
 const jsxOptions = {
@@ -28,7 +29,10 @@ function goodErrors ( diagnostic: ts.Diagnostic ): boolean {
 export default function typescript ( options ) {
 	options = assign( {}, options || {} );
 
-	const filter = createFilter( options.include || [ '*.ts+(|x)', '**/*.ts+(|x)' ], options.exclude );
+	const filter = createFilter(
+		options.include || [ '*.ts+(|x)', '**/*.ts+(|x)' ],
+		options.exclude || [ '*.d.ts', '**/*.d.ts' ] );
+
 	delete options.include;
 	delete options.exclude;
 
@@ -52,6 +56,10 @@ export default function typescript ( options ) {
 			var result = typescript.nodeModuleNameResolver( importee, importer, resolveHost );
 
 			if ( result.resolvedModule && result.resolvedModule.resolvedFileName ) {
+				if ( endsWith( result.resolvedModule.resolvedFileName, '.d.ts' ) ) {
+					return null;
+				}
+
 				return result.resolvedModule.resolvedFileName;
 			}
 

src/string.ts

@@ -0,0 +1,3 @@
+export function endsWith ( str: string, tail: string ): boolean {
+	return !tail.length || str.slice( -tail.length ) === tail;
+}

test/sample/dts/main.ts

@@ -0,0 +1,3 @@
+import { foo } from 'an-import';
+
+foo();

test/test.js

@@ -106,6 +106,17 @@ describe( 'rollup-plugin-typescript', function () {
 		});
 	});
 
+	it( 'should not resolve .d.ts files', function () {
+		return rollup.rollup({
+			entry: 'sample/dts/main.ts',
+			plugins: [
+				typescript()
+			]
+		}).then( function ( bundle ) {
+			assert.deepEqual( bundle.imports, [ 'an-import' ] );
+		});
+	});
+
 	it( 'should transpile JSX if enabled', function () {
 		return rollup.rollup({
 			entry: 'sample/jsx/main.tsx',