remove es20xx prefixes from plugins and rename folders (#6575)

packages/babel-plugin-transform-instanceof/.npmignore

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+src
+test
+*.log

packages/babel-plugin-transform-instanceof/README.md

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+# @babel/plugin-transform-instanceof
+
+## Installation
+
+```sh
+npm install --save-dev @babel/plugin-transform-instanceof
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["@babel/transform-instanceof"]
+}
+```
+
+### Via CLI
+
+```sh
+babel --plugins @babel/transform-instanceof script.js
+```
+
+### Via Node API
+
+```javascript
+require("@babel/core").transform("code", {
+  plugins: ["@babel/transform-instanceof"]
+});
+```

packages/babel-plugin-transform-instanceof/package.json

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+{
+  "name": "@babel/plugin-transform-instanceof",
+  "version": "7.0.0-beta.3",
+  "description": "This plugin transforms all the ES2015 'instanceof' methods",
+  "repository": "https://github.com/babel/babel/tree/master/packages/babel-plugin-transform-instanceof",
+  "license": "MIT",
+  "main": "lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "peerDependencies": {
+    "@babel/core": "7.0.0-beta.3"
+  },
+  "devDependencies": {
+    "@babel/helper-plugin-test-runner": "7.0.0-beta.3"
+  }
+}

packages/babel-plugin-transform-instanceof/src/index.js

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+export default function({ types: t }) {
+  return {
+    visitor: {
+      BinaryExpression(path) {
+        const { node } = path;
+        if (node.operator === "instanceof") {
+          const helper = this.addHelper("instanceof");
+          const isUnderHelper = path.findParent(path => {
+            return (
+              (path.isVariableDeclarator() && path.node.id === helper) ||
+              (path.isFunctionDeclaration() &&
+                path.node.id &&
+                path.node.id.name === helper.name)
+            );
+          });
+
+          if (isUnderHelper) {
+            return;
+          } else {
+            path.replaceWith(t.callExpression(helper, [node.left, node.right]));
+          }
+        }
+      },
+    },
+  };
+}

packages/babel-plugin-transform-instanceof/test/fixtures/instanceof/instanceof/actual.js

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+a instanceof b;

packages/babel-plugin-transform-instanceof/test/fixtures/instanceof/instanceof/exec.js

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+var foo = {};
+foo[Symbol.hasInstance]= function () { return true; };
+
+var bar = {};
+
+assert.ok(bar instanceof foo);
+assert.ok(new String instanceof String);
+
+//
+
+function Greeting(greeting) {
+  this.greeting = greeting;
+}
+
+Object.defineProperty(Greeting, Symbol.hasInstance, {
+  value: function(inst) {
+    return inst.greeting == "hello";
+  }
+});
+
+var a = new Greeting("hello");
+var b = new Greeting("world");
+
+assert.ok(a instanceof Greeting);
+assert.ok(!(b instanceof Greeting));

packages/babel-plugin-transform-instanceof/test/fixtures/instanceof/instanceof/expected.js

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+babelHelpers.instanceof(a, b);

packages/babel-plugin-transform-instanceof/test/fixtures/instanceof/instanceof/options.json

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+{
+  "plugins": ["external-helpers", "transform-instanceof"]
+}

packages/babel-plugin-transform-instanceof/test/index.js

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+import runner from "@babel/helper-plugin-test-runner";
+
+runner(__dirname);