make tmp file hidden

Author: ShMcK

lib/reducers/test-run/run.js

@@ -10,7 +10,7 @@ function runTaskTests(setup) {
         var dir = store_1.default.getState().dir;
         var tutorialConfig = store_1.default.getState().tutorial.config;
         var output = parse_loaders_1.default(tests, tutorialConfig.testSuffix);
-        var target = path_1.join(tutorialConfig.dir || dir, "_tmp" + tutorialConfig.testSuffix);
+        var target = path_1.join(tutorialConfig.dir || dir, ".tmp" + tutorialConfig.testSuffix);
         fs_1.writeFileSync(target, output, 'utf8');
         var config = {
             dir: dir,

src/reducers/test-run/run.ts

@@ -15,7 +15,7 @@ export function runTaskTests(setup?: boolean): boolean {
     // write temporary test file in tutorial directory
     let target = join(
       tutorialConfig.dir || dir,
-      `_tmp${tutorialConfig.testSuffix}`
+      `.tmp${tutorialConfig.testSuffix}`
     );
     writeFileSync(target, output, 'utf8');