Allow tests to be ran with dummy Babel compilation

api.js

@@ -16,6 +16,7 @@ const arrify = require('arrify');
 const ms = require('ms');
 const babelConfigHelper = require('./lib/babel-config');
 const CachingPrecompiler = require('./lib/caching-precompiler');
+const NativeCachingPrecompiler = require('./lib/native-caching-precompiler');
 const RunStatus = require('./lib/run-status');
 const AvaError = require('./lib/ava-error');
 const AvaFiles = require('./lib/ava-files');
@@ -118,13 +119,21 @@ class Api extends EventEmitter {
 		this.options.cacheDir = cacheDir;
 
 		const isPowerAssertEnabled = this.options.powerAssert !== false;
+		const compileJavascriptFiles = this.options.compileJavascriptFiles !== false;
 		return babelConfigHelper.build(this.options.projectDir, cacheDir, this.options.babelConfig, isPowerAssertEnabled)
 			.then(result => {
-				this.precompiler = new CachingPrecompiler({
-					path: cacheDir,
-					getBabelOptions: result.getOptions,
-					babelCacheKeys: result.cacheKeys
-				});
+				if (compileJavascriptFiles) {
+					this.precompiler = new CachingPrecompiler({
+						path: cacheDir,
+						getBabelOptions: result.getOptions,
+						babelCacheKeys: result.cacheKeys
+					});
+				} else {
+					this.precompiler = new NativeCachingPrecompiler({
+						path: cacheDir,
+						babelCacheKeys: result.cacheKeys
+					});
+				}
 			});
 	}
 
@@ -262,7 +271,6 @@ class Api extends EventEmitter {
 					const options = {
 						runOnlyExclusive: this.options.match.length > 0
 					};
-
 					resolve(test.run(options));
 				}).catch(err => {
 					err.file = file;

lib/cli.js

@@ -150,7 +150,8 @@ exports.run = () => {
 		concurrency: conf.concurrency ? parseInt(conf.concurrency, 10) : 0,
 		updateSnapshots: conf.updateSnapshots,
 		snapshotDir: conf.snapshotDir ? path.resolve(projectDir, conf.snapshotDir) : null,
-		color: conf.color
+		color: conf.color,
+		compileJavascriptFiles: conf.compileJavascriptFiles !== false
 	});
 
 	let reporter;

lib/native-caching-precompiler.js

@@ -0,0 +1,39 @@
+'use strict';
+const fs = require('fs');
+const cachingTransform = require('caching-transform');
+const packageHash = require('package-hash');
+const stripBomBuf = require('strip-bom-buf');
+const autoBind = require('auto-bind');
+const md5Hex = require('md5-hex');
+
+class NativeCachingPrecompiler {
+
+	constructor(options) {
+		autoBind(this);
+		this.babelCacheKeys = options.babelCacheKeys;
+		this.cacheDirPath = options.path;
+		this.fileHashes = {};
+		this.transform = cachingTransform({
+			cacheDir: this.cacheDirPath,
+			ext: '.js',
+			factory: () => code => code.toString(), // Native raw
+			salt: packageHash.sync([require.resolve('../package.json')], this.babelCacheKeys),
+			hash: (code, filePath, salt) => {
+				const hash = md5Hex([code, filePath, salt]);
+				this.fileHashes[filePath] = hash;
+				return hash;
+			}
+		});
+	}
+
+	precompileFile(filePath) {
+		if (!this.fileHashes[filePath]) {
+			const source = stripBomBuf(fs.readFileSync(filePath));
+			this.transform(source, filePath);
+		}
+
+		return this.fileHashes[filePath];
+	}
+}
+
+module.exports = NativeCachingPrecompiler;

lib/process-adapter.js

@@ -78,9 +78,10 @@ exports.installSourceMapSupport = () => {
 exports.installPrecompilerHook = () => {
 	installPrecompiler(filename => {
 		const precompiled = opts.precompiled[filename];
-
 		if (precompiled) {
-			sourceMapCache.set(filename, path.join(cacheDir, `${precompiled}.js.map`));
+			if (opts.compileJavascriptFiles) {
+				sourceMapCache.set(filename, path.join(cacheDir, `${precompiled}.js.map`));
+			}
 			return fs.readFileSync(path.join(cacheDir, `${precompiled}.js`), 'utf8');
 		}
 

profile.js

@@ -15,6 +15,7 @@ const arrify = require('arrify');
 const resolveCwd = require('resolve-cwd');
 const babelConfigHelper = require('./lib/babel-config');
 const CachingPrecompiler = require('./lib/caching-precompiler');
+const NativeCachingPrecompiler = require('./lib/native-caching-precompiler');
 const globals = require('./lib/globals');
 
 function resolveModules(modules) {
@@ -78,11 +79,19 @@ const cacheDir = findCacheDir({
 
 babelConfigHelper.build(process.cwd(), cacheDir, conf.babel, true)
 	.then(result => {
-		const precompiler = new CachingPrecompiler({
-			path: cacheDir,
-			getBabelOptions: result.getOptions,
-			babelCacheKeys: result.cacheKeys
-		});
+		let precompiler = null;
+		if (conf.compileJavascriptFiles) {
+			precompiler = new CachingPrecompiler({
+				path: cacheDir,
+				getBabelOptions: result.getOptions,
+				babelCacheKeys: result.cacheKeys
+			});
+		} else {
+			precompiler = new NativeCachingPrecompiler({
+				path: cacheDir,
+				babelCacheKeys: result.cacheKeys
+			});
+		}
 
 		const precompiled = {};
 		precompiled[file] = precompiler.precompileFile(file);