account for web.iterable (babel#283)

* account for web.iterable

* extra test, remove unncessary warning

packages/babel-preset-env/src/use-built-ins-entry-plugin.js

@@ -64,15 +64,6 @@ export default function({ types: t }) {
       }
     },
     Program(path, state) {
-      if (!state.opts.polyfills) {
-        throw path.buildCodeFrameError(
-          `
-There was an issue in "babel-preset-env" such that
-the "polyfills" option was not correctly passed
-to the "transform-polyfill-require" plugin
-`,
-        );
-      }
       path.get("body").forEach(bodyPath => {
         if (isRequire(bodyPath)) {
           bodyPath.replaceWithMultiple(

packages/babel-preset-env/src/use-built-ins-plugin.js

@@ -78,16 +78,7 @@ Please remove the "import 'babel-polyfill'" call or use "useBuiltIns: 'entry'" i
       }
     },
     Program: {
-      enter(path, state) {
-        if (!state.opts.polyfills) {
-          throw path.buildCodeFrameError(
-            `
-There was an issue in "babel-preset-env" such that
-the "polyfills" option was not correctly passed
-to the "transform-polyfill-require" plugin
-`,
-          );
-        }
+      enter(path) {
         path.get("body").forEach(bodyPath => {
           if (isRequire(bodyPath)) {
             console.warn(
@@ -102,8 +93,8 @@ Please remove the "require('babel-polyfill')" call or use "useBuiltIns: 'entry'"
       },
     },
 
-    // Symbol() -> _core.Symbol();
-    // new Promise -> new _core.Promise
+    // Symbol()
+    // new Promise
     ReferencedIdentifier(path, state) {
       const { node, parent, scope } = path;
 
@@ -115,7 +106,49 @@ Please remove the "require('babel-polyfill')" call or use "useBuiltIns: 'entry'"
       addUnsupported(path, state.opts.polyfills, builtIn, this.builtIns);
     },
 
-    // Array.from -> _core.Array.from
+    // arr[Symbol.iterator]()
+    CallExpression(path) {
+      // we can't compile this
+      if (path.node.arguments.length) return;
+
+      const callee = path.node.callee;
+      if (!t.isMemberExpression(callee)) return;
+      if (!callee.computed) return;
+      if (!path.get("callee.property").matchesPattern("Symbol.iterator")) {
+        return;
+      }
+
+      addImport(
+        path,
+        "babel-polyfill/lib/core-js/modules/web.dom.iterable",
+        this.builtIns,
+      );
+    },
+
+    // Symbol.iterator in arr
+    BinaryExpression(path) {
+      if (path.node.operator !== "in") return;
+      if (!path.get("left").matchesPattern("Symbol.iterator")) return;
+
+      addImport(
+        path,
+        "babel-polyfill/lib/core-js/modules/web.dom.iterable",
+        this.builtIns,
+      );
+    },
+
+    // yield*
+    YieldExpression(path) {
+      if (!path.node.delegate) return;
+
+      addImport(
+        path,
+        "babel-polyfill/lib/core-js/modules/web.dom.iterable",
+        this.builtIns,
+      );
+    },
+
+    // Array.from
     MemberExpression: {
       enter(path, state) {
         if (!path.isReferenced()) return;
@@ -134,6 +167,13 @@ Please remove the "require('babel-polyfill')" call or use "useBuiltIns: 'entry'"
           if (has(staticMethods, prop.name)) {
             const builtIn = staticMethods[prop.name];
             addUnsupported(path, state.opts.polyfills, builtIn, this.builtIns);
+            // if (obj.name === "Array" && prop.name === "from") {
+            //   addImport(
+            //     path,
+            //     "babel-polyfill/lib/core-js/modules/web.dom.iterable",
+            //     this.builtIns,
+            //   );
+            // }
           }
         }
 

packages/babel-preset-env/test/fixtures/dom-iterable/symbol-iterator-in/actual.js

@@ -0,0 +1 @@
+Symbol.iterator in arr

packages/babel-preset-env/test/fixtures/dom-iterable/symbol-iterator-in/expected.js

@@ -0,0 +1,3 @@
+import "babel-polyfill/lib/core-js/modules/es6.symbol";
+import "babel-polyfill/lib/core-js/modules/web.dom.iterable";
+Symbol.iterator in arr;

packages/babel-preset-env/test/fixtures/dom-iterable/symbol-iterator-in/options.json

@@ -0,0 +1,8 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "useBuiltIns": true,
+      "modules": false
+    }]
+  ]
+}

packages/babel-preset-env/test/fixtures/dom-iterable/symbol-iterator/actual.js

@@ -0,0 +1 @@
+arr[Symbol.iterator]()

packages/babel-preset-env/test/fixtures/dom-iterable/symbol-iterator/expected.js

@@ -0,0 +1,3 @@
+import "babel-polyfill/lib/core-js/modules/es6.symbol";
+import "babel-polyfill/lib/core-js/modules/web.dom.iterable";
+arr[Symbol.iterator]();

packages/babel-preset-env/test/fixtures/dom-iterable/symbol-iterator/options.json

@@ -0,0 +1,8 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "useBuiltIns": true,
+      "modules": false
+    }]
+  ]
+}

packages/babel-preset-env/test/fixtures/dom-iterable/yield-non-star/actual.js

@@ -0,0 +1,3 @@
+function* a() {
+  yield 1;
+}

packages/babel-preset-env/test/fixtures/dom-iterable/yield-non-star/expected.js

@@ -0,0 +1,3 @@
+function* a() {
+  yield 1;
+}

packages/babel-preset-env/test/fixtures/dom-iterable/yield-non-star/options.json

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "useBuiltIns": true,
+      "targets": {
+        "chrome": 55
+      },
+      "modules": false
+    }]
+  ]
+}

packages/babel-preset-env/test/fixtures/dom-iterable/yield-star/actual.js

@@ -0,0 +1,3 @@
+function* a() {
+  yield* 1;
+}

packages/babel-preset-env/test/fixtures/dom-iterable/yield-star/expected.js

@@ -0,0 +1,4 @@
+import "babel-polyfill/lib/core-js/modules/web.dom.iterable";
+function* a() {
+  yield* 1;
+}

packages/babel-preset-env/test/fixtures/dom-iterable/yield-star/options.json

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["../../../../lib", {
+      "useBuiltIns": true,
+      "targets": {
+        "chrome": 55
+      },
+      "modules": false
+    }]
+  ]
+}

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/builtins-used-instance-methods-native-support/expected.js

@@ -9,4 +9,4 @@ d.fill.bind(); //.bind
 e.padStart.apply(); // .apply
 f.padEnd.call(); // .call
 String.prototype.startsWith.call; // prototype.call
-var { codePointAt, endsWith } = k; // destructuring
+var { codePointAt, endsWith } = k; // destructuring

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/builtins-used-instance-methods/expected.js

@@ -36,4 +36,4 @@ i[asdf]; // computed with identifier
 j["search"]; // computed with template
 k[asdf3]; // computed with concat strings
 var _k2 = k,
-    _a = _k2[asdf2]; // computed
+    _a = _k2[asdf2]; // computed

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/builtins-used-native-support/actual.js

@@ -2,7 +2,6 @@ Array.from; // static method
 Map; // built-in
 new Promise(); // new builtin
 Symbol.match; // as member expression
-_arr[Symbol.iterator](); // Symbol.iterator
 
 // no import
 Array.asdf;

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/builtins-used-native-support/expected.js

@@ -2,7 +2,6 @@ Array.from; // static method
 Map; // built-in
 new Promise(); // new builtin
 Symbol.match; // as member expression
-_arr[Symbol.iterator](); // Symbol.iterator
 
 // no import
 Array.asdf;
@@ -23,4 +22,4 @@ function H(WeakMap) {
 var asdf = 'copyWithin';
 i[asdf]; // computed with identifier
 j[`copyWithin`]; // computed with template
-var { [asdf]: _a } = k; // computed
+var { [asdf]: _a } = k; // computed

packages/babel-preset-env/test/fixtures/preset-options-add-used-built-ins/builtins-used/expected.js

@@ -1,3 +1,4 @@
+import "babel-polyfill/lib/core-js/modules/web.dom.iterable";
 import "babel-polyfill/lib/core-js/modules/es6.symbol";
 import "babel-polyfill/lib/core-js/modules/es6.regexp.match";
 import "babel-polyfill/lib/core-js/modules/es6.promise";
@@ -22,4 +23,4 @@ _arr9[Symbol.iterator2]();
 G.assign; // static method
 function H(WeakMap) {
   var blah = new WeakMap();
-} // shadowed
+} // shadowed