Automatically watch for snapshot changes

Author: novemberborn

docs/recipes/watch-mode.md

@@ -65,7 +65,7 @@ AVA uses [`chokidar`] as the file watcher. Note that even if you see warnings ab
 
 In AVA there's a distinction between *source files* and *test files*. As you can imagine the *test files* contain your tests. *Source files* are all other files that are needed for the tests to run, be it your source code or test fixtures.
 
-By default AVA watches for changes to the test files, `package.json`, and any other `.js` files. It'll ignore files in [certain directories](https://github.com/novemberborn/ignore-by-default/blob/master/index.js) as provided by the [`ignore-by-default`] package.
+By default AVA watches for changes to the test files, snapshot files, `package.json`, and any other `.js` files. It'll ignore files in [certain directories](https://github.com/novemberborn/ignore-by-default/blob/master/index.js) as provided by the [`ignore-by-default`] package.
 
 You can configure patterns for the source files in the [`ava` section of your `package.json`] file, using the `source` key.
 

lib/ava-files.js

@@ -265,7 +265,7 @@ class AvaFiles {
 		ignored = getDefaultIgnorePatterns().concat(ignored, overrideDefaultIgnorePatterns);
 
 		if (paths.length === 0) {
-			paths = ['package.json', '**/*.js'];
+			paths = ['package.json', '**/*.js', '**/*.snap'];
 		}
 
 		paths = paths.concat(this.files);

test/fixture/snapshots/package.json

@@ -1,5 +1 @@
-{
-	"ava": {
-		"source": "**/*"
-	}
-}
+{}

test/watcher.js

@@ -161,7 +161,7 @@ group('chokidar', (beforeEach, test, group) => {
 
 		t.ok(chokidar.watch.calledOnce);
 		t.strictDeepEqual(chokidar.watch.firstCall.args, [
-			['package.json', '**/*.js'].concat(files),
+			['package.json', '**/*.js', '**/*.snap'].concat(files),
 			{
 				ignored: defaultIgnore.map(dir => `${dir}/**/*`),
 				ignoreInitial: true