add 6.x versioned docs

website/pages/en/versions.js

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+const React = require("react");
+
+const CompLibrary = require("../../core/CompLibrary.js");
+const Container = CompLibrary.Container;
+
+const CWD = process.cwd();
+const siteConfig = require(CWD + "/siteConfig.js");
+// const versions = require(CWD + "/versions.json");
+
+class Versions extends React.Component {
+  render() {
+    return (
+      <div className="pageContainer">
+        <Container className="mainContainer">
+          <h1>Babel Versions</h1>
+          <div><a href={`${siteConfig.baseUrl}docs/en/next/index.html`}>Master Docs</a></div>
+          <div><a href={`${siteConfig.baseUrl}docs/en/index.html`}>6.x Docs</a></div>
+        </Container>
+      </div>
+    );
+  }
+}
+
+Versions.defaultProps = {
+  language: "en",
+};
+
+module.exports = Versions;

website/versioned_docs/version-6.x/babel.md

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+---
+# Don't edit this file directly, it was copied using scripts/download-readmes.js: 
+id: version-6.x-babel
+title: babel
+sidebar_label: babel
+original_id: babel
+---
+
+Currently unused in 6.x. You probably meant to use `babel-cli`.
+

website/versioned_docs/version-6.x/babelrc.md

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+---
+layout: docs
+title: .babelrc
+description: How to use the .babelrc
+permalink: /docs/usage/babelrc/
+: 
+id: version-6.x-babelrc
+original_id: babelrc
+---
+
+All Babel API [options](api.md) except the callbacks are allowed (because `.babelrc` files are serialized as [JSON5](https://github.com/json5/json5)).
+
+**Example:**
+
+```json
+{
+  "plugins": ["transform-react-jsx"],
+  "ignore": [
+    "foo.js",
+    "bar/**/*.js"
+  ]
+}
+```
+
+## Use via `package.json`
+
+You can alternatively choose to specify your `.babelrc` config from within `package.json` like so:
+
+```json
+{
+  "name": "my-package",
+  "version": "1.0.0",
+  "babel": {
+    // my babel config here
+  }
+}
+```
+
+## `env` option
+
+You can use the `env` option to set specific options when in a certain environment:
+
+```json
+{
+  "env": {
+    "production": {
+      "plugins": ["transform-react-constant-elements"]
+    }
+  }
+}
+```
+
+Options specific to a certain environment are merged into and overwrite non-env specific options.
+
+The `env` key will be taken from `process.env.BABEL_ENV`, when this is not available then it uses
+`process.env.NODE_ENV` if even that is not available then it defaults to `"development"`.
+
+You can set this environment variable with the following:
+
+**Unix**
+
+At the start of a command:
+
+```sh
+BABEL_ENV=production YOUR_COMMAND_HERE
+```
+
+Or as a separate command:
+
+```sh
+export BABEL_ENV=production
+```
+
+```sh
+YOUR_COMMAND_HERE
+```
+
+**Windows**
+
+```sh
+SET BABEL_ENV=production
+```
+
+```sh
+YOUR_COMMAND_HERE
+```
+
+> If you want your command to work across platforms, you can use [`cross-env`](https://www.npmjs.com/package/cross-env)
+
+## Lookup behavior
+
+Babel will look for a `.babelrc` in the current directory of the file being transpiled. If one does not exist, it will travel up the directory tree until it finds either a `.babelrc`, or a `package.json` with a `"babel": {}` hash within.
+
+Use `"babelrc": false` in [options](api.md#options) to stop lookup behavior, or provide the [`--no-babelrc` CLI flag](babel-cli.md#babel-ignoring-babelrc).

website/versioned_docs/version-6.x/babylon.md

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+---
+# Don't edit this file directly, it was copied using scripts/download-readmes.js: 
+id: version-6.x-babylon
+title: babylon
+sidebar_label: babylon
+original_id: babylon
+---
+
+<p align="center">
+  Babylon is a JavaScript parser used in <a href="https://github.com/babel/babel">Babel</a>.
+</p>
+
+<p align="center">
+  <a href="https://travis-ci.org/babel/babylon"><img alt="Travis Status" src="https://img.shields.io/travis/babel/babylon/master.svg?style=flat&label=travis"></a>
+  <a href="https://codecov.io/gh/babel/babylon"><img alt="Codecov Status" src="https://img.shields.io/codecov/c/github/babel/babylon/master.svg?style=flat"></a>
+</p>
+
+ - The latest ECMAScript version enabled by default (ES2017).
+ - Comment attachment.
+ - Support for JSX and Flow.
+ - Support for experimental language proposals (accepting PRs for anything at least [stage-0](https://github.com/tc39/proposals/blob/master/stage-0-proposals.md)).
+
+## Credits
+
+Heavily based on [acorn](https://github.com/marijnh/acorn) and [acorn-jsx](https://github.com/RReverser/acorn-jsx),
+thanks to the awesome work of [@RReverser](https://github.com/RReverser) and [@marijnh](https://github.com/marijnh).
+
+Significant diversions are expected to occur in the future such as streaming, EBNF definitions, sweet.js integration, interspatial parsing and more.
+
+## API
+
+### `babylon.parse(code, [options])`
+
+### `babylon.parseExpression(code, [options])`
+
+`parse()` parses the provided `code` as an entire ECMAScript program, while
+`parseExpression()` tries to parse a single Expression with performance in
+mind. When in doubt, use `.parse()`.
+
+### Options
+
+- **allowImportExportEverywhere**: By default, `import` and `export`
+  declarations can only appear at a program's top level. Setting this
+  option to `true` allows them anywhere where a statement is allowed.
+
+- **allowReturnOutsideFunction**: By default, a return statement at
+  the top level raises an error. Set this to `true` to accept such
+  code.
+
+- **allowSuperOutsideMethod**: TODO
+
+- **sourceType**: Indicate the mode the code should be parsed in. Can be
+  either `"script"` or `"module"`.
+
+- **sourceFilename**: Correlate output AST nodes with their source filename.  Useful when generating code and source maps from the ASTs of multiple input files.
+
+- **startLine**: By default, the first line of code parsed is treated as line 1. You can provide a line number to alternatively start with. Useful for integration with other source tools.
+
+- **plugins**: Array containing the plugins that you want to enable.
+
+- **strictMode**: TODO
+
+### Output
+
+Babylon generates AST according to [Babel AST format][].
+It is based on [ESTree spec][] with the following deviations:
+
+> There is now an `estree` plugin which reverts these deviations
+
+- [Literal][] token is replaced with [StringLiteral][], [NumericLiteral][], [BooleanLiteral][], [NullLiteral][], [RegExpLiteral][]
+- [Property][] token is replaced with [ObjectProperty][] and [ObjectMethod][]
+- [MethodDefinition][] is replaced with [ClassMethod][]
+- [Program][] and [BlockStatement][] contain additional `directives` field with [Directive][] and [DirectiveLiteral][]
+- [ClassMethod][], [ObjectProperty][], and [ObjectMethod][] value property's properties in [FunctionExpression][] is coerced/brought into the main method node.
+
+AST for JSX code is based on [Facebook JSX AST][] with the addition of one node type:
+
+- `JSXText`
+
+[Babel AST format]: https://github.com/babel/babylon/blob/master/ast/spec.md
+[ESTree spec]: https://github.com/estree/estree
+
+[Literal]: https://github.com/estree/estree/blob/master/es5.md#literal
+[Property]: https://github.com/estree/estree/blob/master/es5.md#property
+[MethodDefinition]: https://github.com/estree/estree/blob/master/es2015.md#methoddefinition
+
+[StringLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#stringliteral
+[NumericLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#numericliteral
+[BooleanLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#booleanliteral
+[NullLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#nullliteral
+[RegExpLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#regexpliteral
+[ObjectProperty]: https://github.com/babel/babylon/blob/master/ast/spec.md#objectproperty
+[ObjectMethod]: https://github.com/babel/babylon/blob/master/ast/spec.md#objectmethod
+[ClassMethod]: https://github.com/babel/babylon/blob/master/ast/spec.md#classmethod
+[Program]: https://github.com/babel/babylon/blob/master/ast/spec.md#programs
+[BlockStatement]: https://github.com/babel/babylon/blob/master/ast/spec.md#blockstatement
+[Directive]: https://github.com/babel/babylon/blob/master/ast/spec.md#directive
+[DirectiveLiteral]: https://github.com/babel/babylon/blob/master/ast/spec.md#directiveliteral
+[FunctionExpression]: https://github.com/babel/babylon/blob/master/ast/spec.md#functionexpression
+
+[Facebook JSX AST]: https://github.com/facebook/jsx/blob/master/AST.md
+
+### Semver
+
+Babylon follows semver in most situations. The only thing to note is that some spec-compliancy bug fixes may be released under patch versions.
+
+For example: We push a fix to early error on something like [#107](https://github.com/babel/babylon/pull/107) - multiple default exports per file. That would be considered a bug fix even though it would cause a build to fail.
+
+### Example
+
+```javascript
+require("babylon").parse("code", {
+  // parse in strict mode and allow module declarations
+  sourceType: "module",
+
+  plugins: [
+    // enable jsx and flow syntax
+    "jsx",
+    "flow"
+  ]
+});
+```
+
+### Plugins
+
+ - `estree`
+ - `jsx`
+ - `flow`
+ - `doExpressions`
+ - `objectRestSpread`
+ - `decorators` (Based on an outdated version of the Decorators proposal. Will be removed in a future version of `Babylon`)
+ - `classProperties`
+ - `exportExtensions`
+ - `asyncGenerators`
+ - `functionBind`
+ - `functionSent`
+ - `dynamicImport`
+ - `templateInvalidEscapes`
+

website/versioned_docs/version-6.x/caveats.md

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+---
+layout: docs
+title: Caveats
+description: Just some things to keep in mind when using Babel.
+permalink: /docs/usage/caveats/
+: 
+id: version-6.x-caveats
+original_id: caveats
+---
+
+## Polyfills
+
+In order for certain features to work they require certain polyfills. You can satisfy **all**
+Babel feature requirements by using [babel-polyfill](polyfill.md).
+
+You may alternatively/selectively include what you need:
+
+| Feature                     | Requirements                                                                          |
+| --------------------------- | ------------------------------------------------------------------------------------- |
+| Async functions, Generators | [regenerator runtime](https://github.com/facebook/regenerator/tree/master/packages/regenerator-runtime) |
+| Array destructuring, For Of | `Symbol`, `prototype[Symbol.iterator]`                                                |
+| Spread                      | `Array.from`                                                                          |
+
+There is also the `loose` option for some of these plugins.
+
+## Classes
+
+Built-in classes such as `Date`, `Array`, `DOM` etc cannot be properly subclassed
+due to limitations in ES5 (for the [es2015-classes](plugin-transform-es2015-classes.md) plugin).
+You can try to use [babel-plugin-transform-builtin-extend](https://github.com/loganfsmyth/babel-plugin-transform-builtin-extend) based on `Object.setPrototypeOf` and `Reflect.construct`, but it also has some limitations.
+
+## ES5
+
+Since Babel assumes that your code will run in an ES5 environment it uses ES5
+functions. So if you're using an environment that has limited or no support for
+ES5 such as lower versions of IE then using [babel-polyfill](polyfill.md) will add support for these methods.
+
+## Internet Explorer
+
+### Classes (10 and below)
+
+If you're inheriting from a class then static properties are inherited from it
+via [\_\_proto\_\_](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto),
+this is widely supported but you may run into problems with much older browsers.
+
+**NOTE:** `__proto__` is not supported on IE <= 10 so static properties
+**will not** be inherited. See the
+[protoToAssign](plugin-transform-proto-to-assign.md) for a possible work
+around.
+
+For classes that have `super`s, the super class won't resolve correctly. You can
+get around this by enabling the `loose` option in the [es2015-classes](plugin-transform-es2015-classes.md) plugin.
+
+### Getters/setters (8 and below)
+
+In IE8 `Object.defineProperty` can only be used on DOM objects. This is
+unfortunate as it's required to set getters and setters. Due to this if
+you plan on supporting IE8 or below then the usage of getters and setters
+isn't recommended.
+
+**Reference**: [MDN](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty#Internet_Explorer_8_specific_notes).
+
+#### Modules
+
+By default, when using modules with Babel a non-enumerable `__esModule` property
+is exported. This is done through the use of `Object.defineProperty` which is
+unsupported in IE8 and below. A workaround for this is to enable the `loose` option in your corresponding module plugin.