fix: Support files without exported locals

index.js

@@ -69,10 +69,6 @@ module.exports = function(content, ...rest) {
 
   const localExports = content.split('exports.locals')[1];
 
-  if (!localExports) {
-    return failed(new Error(`No exported locals found for ${filename}`));
-  }
-
   while ((match = keyRegex.exec(localExports))) {
     if (cssModuleKeys.indexOf(match[1]) < 0) {
       cssModuleKeys.push(match[1]);

test/emit-empty-declaration/.gitignore

@@ -0,0 +1 @@
+index.css.d.ts

test/emit-empty-declaration/__snapshots__/emit-empty-declaration.test.js.snap

@@ -0,0 +1,12 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Can emit valid declaration without classes 1`] = `
+"// This file is automatically generated.
+// Please do not change this file!
+interface CssExports {
+
+}
+declare var cssExports: CssExports;
+export = cssExports;
+"
+`;

test/emit-empty-declaration/emit-empty-declaration.test.js

@@ -0,0 +1,13 @@
+const fs = require('fs');
+const compiler = require('../compiler.js');
+
+test('Can emit valid declaration without classes', async () => {
+  await compiler(require.resolve('./index.js'));
+
+  const declaration = fs.readFileSync(
+    require.resolve('./index.css.d.ts'),
+    'utf-8'
+  );
+
+  expect(declaration).toMatchSnapshot();
+});

test/emit-empty-declaration/index.css

@@ -0,0 +1,3 @@
+html {
+  /* No class selectors in this file ... */
+}

test/emit-empty-declaration/index.js

@@ -0,0 +1 @@
+import "./index.css";