Latest tests (#3674)

* add preset-latest tests

* test for es2015-preset spec option

packages/babel-preset-es2015/test/fixtures/preset-options/spec/actual.js

@@ -0,0 +1,7 @@
+`1${a}`;
+
+() => {};
+
+function a() {
+  () => {}
+}

packages/babel-preset-es2015/test/fixtures/preset-options/spec/expected.js

@@ -0,0 +1,15 @@
+"use strict";
+
+"1" + String(a);
+
+(function () {
+  babelHelpers.newArrowCheck(undefined, undefined);
+}).bind(undefined);
+
+function a() {
+  var _this = this;
+
+  (function () {
+    babelHelpers.newArrowCheck(this, _this);
+  }).bind(this);
+}

packages/babel-preset-es2015/test/fixtures/preset-options/spec/options.json

@@ -0,0 +1,8 @@
+{
+  "presets": [
+    ["es2015", { "spec": true }]
+  ],
+  "plugins": [
+    "external-helpers"
+  ]
+}

packages/babel-preset-latest/package.json

@@ -11,5 +11,8 @@
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-es2016": "^6.11.3",
     "babel-preset-es2017": "^2.0.0"
+  },
+  "devDependencies": {
+    "babel-helper-plugin-test-runner": "^6.8.0"
   }
 }

packages/babel-preset-latest/src/index.js

@@ -1,9 +1,11 @@
+const { buildPreset } = require("babel-preset-es2015");
+
 module.exports = function preset(context, opts = {}) {
   return {
     presets: [
-      opts.es2015 !== false && [require("babel-preset-es2015"), opts.es2015],
-      opts.es2016 !== false && [require("babel-preset-es2016"), opts.es2016],
-      opts.es2017 !== false && [require("babel-preset-es2017"), opts.es2017]
+      opts.es2015 !== false && [buildPreset, opts.es2015],
+      opts.es2016 !== false && require("babel-preset-es2016"),
+      opts.es2017 !== false && require("babel-preset-es2017")
     ].filter(Boolean)
   };
 };

packages/babel-preset-latest/test/fixtures/preset-options/es2015-false/actual.js

@@ -0,0 +1,5 @@
+// keep es2015
+let b = 1;
+
+// transform es2016
+a ** b;

packages/babel-preset-latest/test/fixtures/preset-options/es2015-false/expected.js

@@ -0,0 +1,5 @@
+// keep es2015
+let b = 1;
+
+// transform es2016
+Math.pow(a, b);

packages/babel-preset-latest/test/fixtures/preset-options/es2015-false/options.json

@@ -0,0 +1,5 @@
+{
+  "presets": [
+    ["latest", { "es2015": false }]
+  ]
+}

packages/babel-preset-latest/test/fixtures/preset-options/es2015-options/actual.js

@@ -0,0 +1,5 @@
+// transform es2015 with loose
+export var a = 1;
+
+// transform es2016
+a ** b;

packages/babel-preset-latest/test/fixtures/preset-options/es2015-options/expected.js

@@ -0,0 +1,8 @@
+"use strict";
+
+exports.__esModule = true;
+// transform es2015 with loose
+var a = exports.a = 1;
+
+// transform es2016
+Math.pow(a, b);

packages/babel-preset-latest/test/fixtures/preset-options/es2015-options/options.json

@@ -0,0 +1,5 @@
+{
+  "presets": [
+    ["latest", { "es2015": { "loose": true } }]
+  ]
+}

packages/babel-preset-latest/test/fixtures/preset-options/es2016-false/actual.js

@@ -0,0 +1,5 @@
+// transform es2015
+let b = 1;
+
+// keep es2016
+a ** b;

packages/babel-preset-latest/test/fixtures/preset-options/es2016-false/expected.js

@@ -0,0 +1,7 @@
+"use strict";
+
+// transform es2015
+var b = 1;
+
+// keep es2016
+a ** b;

packages/babel-preset-latest/test/fixtures/preset-options/es2016-false/options.json

@@ -0,0 +1,5 @@
+{
+  "presets": [
+    ["latest", { "es2016": false }]
+  ]
+}

packages/babel-preset-latest/test/index.js

@@ -0,0 +1 @@
+require("babel-helper-plugin-test-runner")(__dirname);