Add option to disable power-assert - fixes #1017 (#1024)

api.js

@@ -119,7 +119,7 @@ Api.prototype._run = function (files, _options) {
 	})) || uniqueTempDir();
 
 	self.options.cacheDir = cacheDir;
-	self.precompiler = new CachingPrecompiler(cacheDir, self.options.babelConfig);
+	self.precompiler = new CachingPrecompiler(cacheDir, self.options.babelConfig, self.options.powerAssert);
 	self.fileCount = files.length;
 
 	var overwatch;

cli.js

@@ -64,6 +64,7 @@ var cli = meow([
 	'  --tap, -t          Generate TAP output',
 	'  --verbose, -v      Enable verbose output',
 	'  --no-cache         Disable the transpiler cache',
+	'  --no-power-assert  Disable Power Assert',
 	'  --match, -m        Only run tests with matching title (Can be repeated)',
 	'  --watch, -w        Re-run tests when tests and source files change',
 	'  --source, -S       Pattern to match source files so tests can be re-run (Can be repeated)',
@@ -130,6 +131,7 @@ var api = new Api({
 	serial: cli.flags.serial,
 	require: arrify(cli.flags.require),
 	cacheEnabled: cli.flags.cache !== false,
+	powerAssert: cli.flags.powerAssert !== false,
 	explicitTitles: cli.flags.watch,
 	match: arrify(cli.flags.match),
 	babelConfig: conf.babel,

lib/babel-config.js

@@ -77,14 +77,13 @@ var espowerPlugin = lazy(function () {
 
 var defaultPlugins = lazy(function () {
 	return [
-		espowerPlugin(),
 		require('babel-plugin-ava-throws-helper'),
 		rewritePlugin(),
 		require('babel-plugin-transform-runtime')
 	];
 });
 
-function build(babelConfig, filePath, code) {
+function build(babelConfig, powerAssert, filePath, code) {
 	babelConfig = validate(babelConfig);
 
 	var options;
@@ -115,7 +114,9 @@ function build(babelConfig, filePath, code) {
 		ast: false
 	});
 
-	options.plugins = (options.plugins || []).concat(defaultPlugins());
+	options.plugins = (options.plugins || [])
+		.concat(powerAssert ? espowerPlugin() : [])
+		.concat(defaultPlugins());
 
 	return options;
 }

lib/caching-precompiler.js

@@ -9,12 +9,13 @@ var packageHash = require('package-hash');
 var autoBind = require('auto-bind');
 var babelConfigHelper = require('./babel-config');
 
-function CachingPrecompiler(cacheDirPath, babelConfig) {
+function CachingPrecompiler(cacheDirPath, babelConfig, powerAssert) {
 	if (!(this instanceof CachingPrecompiler)) {
 		throw new TypeError('Class constructor CachingPrecompiler cannot be invoked without \'new\'');
 	}
 
 	this.babelConfig = babelConfigHelper.validate(babelConfig);
+	this.powerAssert = powerAssert;
 	this.cacheDirPath = cacheDirPath;
 	this.fileHashes = {};
 
@@ -49,7 +50,7 @@ CachingPrecompiler.prototype._init = function () {
 CachingPrecompiler.prototype._transform = function (code, filePath, hash) {
 	code = code.toString();
 
-	var options = babelConfigHelper.build(this.babelConfig, filePath, code);
+	var options = babelConfigHelper.build(this.babelConfig, this.powerAssert, filePath, code);
 	var result = this.babel.transform(code, options);
 
 	// save source map

readme.md

@@ -144,6 +144,7 @@ $ ava --help
     --tap, -t          Generate TAP output
     --verbose, -v      Enable verbose output
     --no-cache         Disable the transpiler cache
+    --no-power-assert  Disable Power Assert
     --match, -m        Only run tests with matching title (Can be repeated)
     --watch, -w        Re-run tests when tests and source files change
     --source, -S       Pattern to match source files so tests can be re-run (Can be repeated)
@@ -223,6 +224,7 @@ All of the CLI options can be configured in the `ava` section of your `package.j
     "concurrency": 5,
     "failFast": true,
     "tap": true,
+    "powerAssert": false,
     "require": [
       "babel-register"
     ],

test/api.js

@@ -16,6 +16,8 @@ test('must be called with new', function (t) {
 });
 
 generateTests('Without Pool: ', function (options) {
+	options = options || {};
+	options.powerAssert = true;
 	return new Api(options);
 });
 
@@ -60,6 +62,7 @@ test('Without Pool: test files can be forced to run in exclusive mode', function
 generateTests('With Pool: ', function (options) {
 	options = options || {};
 	options.concurrency = 2;
+	options.powerAssert = true;
 	return new Api(options);
 });
 

test/babel-config.js

@@ -50,7 +50,8 @@ test('uses babelConfig for babel options when babelConfig is an object', functio
 	var fixturePath = fixture('es2015.js');
 	var fixtureSource = fs.readFileSync(fixturePath, 'utf8');
 
-	var options = babelConfigHelper.build(babelConfig, fixturePath, fixtureSource);
+	var powerAssert = true;
+	var options = babelConfigHelper.build(babelConfig, powerAssert, fixturePath, fixtureSource);
 
 	t.true('filename' in options);
 	t.true(options.sourceMaps);
@@ -79,7 +80,8 @@ test('should reuse existing source maps', function (t) {
 	var fixturePath = fixture('es2015-source-maps.js');
 	var fixtureSource = fs.readFileSync(fixturePath, 'utf8');
 
-	var options = babelConfigHelper.build(babelConfig, fixturePath, fixtureSource);
+	var powerAssert = true;
+	var options = babelConfigHelper.build(babelConfig, powerAssert, fixturePath, fixtureSource);
 
 	t.true('filename' in options);
 	t.true(options.sourceMaps);
@@ -89,3 +91,27 @@ test('should reuse existing source maps', function (t) {
 	t.strictDeepEqual(options.plugins, [customPlugin, setup.powerAssert, throwsHelper, setup.rewrite, transformRuntime]);
 	t.end();
 });
+
+test('should disable power-assert when powerAssert is false', function (t) {
+	var setup = setUp();
+	var customPlugin = setup.customPlugin;
+
+	var babelConfigHelper = proxyquire('../lib/babel-config', {
+		'babel-plugin-espower/create': setup.createEspowerPlugin,
+		'babel-plugin-detective/wrap-listener': setup.babelDetectiveWrap
+	});
+
+	var babelConfig = {
+		presets: ['stage-2', 'es2015'],
+		plugins: [customPlugin]
+	};
+
+	var fixturePath = fixture('es2015.js');
+	var fixtureSource = fs.readFileSync(fixturePath, 'utf8');
+
+	var powerAssert = false;
+	var options = babelConfigHelper.build(babelConfig, powerAssert, fixturePath, fixtureSource);
+
+	t.strictDeepEqual(options.plugins, [customPlugin, throwsHelper, setup.rewrite, transformRuntime]);
+	t.end();
+});