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+# babel-generator
+
+> Turns an AST into code.
+
+## Install
+
+```sh
+$ npm install babel-generator
+```
+
+## Usage
+
+```js
+import {parse} from 'babylon';
+import generate from 'babel-generator';
+
+const code = 'class Example {}';
+const ast = parse(code);
+
+const output = generate(ast, { /* options */ }, code);
+```
+
+## Options
+
+Options for formatting output:
+
+name                   | type     | default         | description
+-----------------------|----------|-----------------|--------------------------------------------------------------------------
+auxiliaryCommentBefore | string   |                 | Optional string to add as a block comment at the start of the output file
+auxiliaryCommentAfter  | string   |                 | Optional string to add as a block comment at the end of the output file
+shouldPrintComment     | function | `opts.comments` | Function that takes a comment (as a string) and returns `true` if the comment should be included in the output.  By default, comments are included if `opts.comments` is `true` or if `opts.minifed` is `false` and the comment contains `@preserve` or `@license`
+retainLines            | boolean  | `false`         | Attempt to use the same line numbers in the output code as in the source code (helps preserve stack traces)
+retainFunctionParens   | boolean  | `false`         | Retain parens around function expressions (could be used to change engine parsing behavior)
+comments               | boolean  | `true`          | Should comments be included in output
+compact                | boolean or `'auto'` | `opts.minified` | Set to `true` to avoid adding whitespace for formatting
+minified               | boolean  | `false`         | Should the output be minified
+concise                | boolean  | `false`         | Set to `true` to reduce whitespace (but not as much as `opts.compact`)
+quotes                 | `'single'` or `'double'` | autodetect based on `ast.tokens` | The type of quote to use in the output
+filename               | string   |                 | Used in warning messages
+
+Options for source maps:
+
+name                   | type     | default         | description
+-----------------------|----------|-----------------|--------------------------------------------------------------------------
+sourceMaps             | boolean  | `false`         | Enable generating source maps
+sourceMapTarget        | string   |                 | The filename of the generated code that the source map will be associated with
+sourceRoot             | string   |                 | A root for all relative URLs in the source map
+sourceFileName         | string   |                 | The filename for the source code (i.e. the code in the `code` argument).  This will only be used if `code` is a string.
+
+## AST from Multiple Sources
+
+In most cases, Babel does a 1:1 transformation of input-file to output-file.  However,
+you may be dealing with AST constructed from multiple sources - JS files, templates, etc.
+If this is the case, and you want the sourcemaps to reflect the correct sources, you'll need
+to make some changes to your code.
+
+First, each node with a `loc` property (which indicates that node's original placement in the
+source document) must also include a `loc.filename` property, set to the source filename.
+
+Second, you should pass an object to `generate` as the `code` parameter.  Keys
+should be the source filenames, and values should be the source content.
+
+Here's an example of what that might look like:
+
+```js
+import {parse} from 'babylon';
+import generate from 'babel-generator';
+
+const a = 'var a = 1;';
+const b = 'var b = 2;';
+const astA = parse(a, { filename: 'a.js' });
+const astB = parse(b, { filename: 'b.js' });
+const ast = {
+  type: 'Program',
+  body: [].concat(astA.body, ast2.body)
+};
+
+const { code, map } = generate(ast, { /* options */ }, {
+  'a.js': a,
+  'b.js': b
+});
+
+// Sourcemap will point to both a.js and b.js where appropriate.
+```