Support a router.ts file when generating routes

blueprints/route/index.js

@@ -5,6 +5,7 @@ const path = require('path');
 const chalk = require('chalk');
 const stringUtil = require('ember-cli-string-utils');
 const EmberRouterGenerator = require('ember-router-generator');
+const SilentError = require('silent-error');
 
 const maybePolyfillTypeScriptBlueprints = require('../-maybe-polyfill-typescript-blueprints');
 
@@ -148,21 +149,30 @@ function updateRouter(action, options) {
   }
 }
 
-function findRouter(options) {
+function findRouterPath(options) {
   let routerPathParts = [options.project.root];
-  let root = 'app';
 
   if (options.dummy && options.project.isEmberCLIAddon()) {
-    routerPathParts = routerPathParts.concat(['tests', 'dummy', root, 'router.js']);
+    routerPathParts.push('tests', 'dummy', 'app');
   } else {
-    routerPathParts = routerPathParts.concat([root, 'router.js']);
+    routerPathParts.push('app');
   }
 
-  return routerPathParts;
+  for (const routerFile of ['router.js', 'router.ts']) {
+    let routerPath = path.join(...routerPathParts, routerFile);
+
+    if (fs.existsSync(routerPath)) {
+      return routerPath;
+    }
+  }
+
+  throw new SilentError(
+    'Could not find router file. Please make sure your project has a `router.js` or `router.ts` file.'
+  );
 }
 
 function writeRoute(action, name, options) {
-  let routerPath = path.join.apply(null, findRouter(options));
+  let routerPath = findRouterPath(options);
   let source = fs.readFileSync(routerPath, 'utf-8');
 
   let routes = new EmberRouterGenerator(source);

node-tests/blueprints/route-test.js

@@ -301,6 +301,24 @@ describe('Blueprint: route', function () {
         });
       });
     });
+
+    it('using a `router.ts` file', async function () {
+      fs.moveSync('app/router.js', 'app/router.ts');
+
+      await emberGenerate(['route', 'foo']);
+      expect(file('app/router.ts')).to.contain("this.route('foo')");
+
+      await emberDestroy(['route', 'foo']);
+      expect(file('app/router.ts')).to.not.contain("this.route('foo')");
+    });
+
+    it('throws a helpful error if the router file could not be found', async function () {
+      fs.removeSync('app/router.js');
+
+      await expect(emberGenerate(['route', 'foo'])).to.be.rejectedWith(
+        'Could not find router file. Please make sure your project has a `router.js` or `router.ts` file.'
+      );
+    });
   });
 
   describe('in addon - octane', function () {
@@ -514,6 +532,24 @@ describe('Blueprint: route', function () {
         });
       });
     });
+
+    it('using a `router.ts` file', async function () {
+      fs.moveSync('tests/dummy/app/router.js', 'tests/dummy/app/router.ts');
+
+      await emberGenerate(['route', 'foo', '--dummy']);
+      expect(file('tests/dummy/app/router.ts')).to.contain("this.route('foo')");
+
+      await emberDestroy(['route', 'foo', '--dummy']);
+      expect(file('tests/dummy/app/router.ts')).to.not.contain("this.route('foo')");
+    });
+
+    it('throws a helpful error if the router file could not be found', async function () {
+      fs.removeSync('tests/dummy/app/router.js');
+
+      await expect(emberGenerate(['route', 'foo', '--dummy'])).to.be.rejectedWith(
+        'Could not find router file. Please make sure your project has a `router.js` or `router.ts` file.'
+      );
+    });
   });
 
   describe('in in-repo-addon', function () {