Issue originally made by Jan Potoms (jan)

Bug information

• Babel version: 6.5.0
• Node version: 5.6.0
• npm version: 3.6.0

Input code

var babylon = require('babylon');
var generate = require('babel-generator')['default'];

function check (code, options) {
  var ast = babylon.parse(code, options);
  console.log(generate(ast, options, code).code);
}

check('"foo"; "bar"; \'baz\'', {});
// output  : "foo";"bar";'baz';
// expected: "foo";"bar";"baz";

check("'foo'; 'bar'; \"baz\"", {});
// output  : 'foo';'bar';"baz";
// expected: 'foo';'bar';'baz';

check('"foo"; "bar"; \'baz\'', { quotes: 'single' });
// output  : "foo";"bar";'baz';
// expected: 'foo';'bar';'baz';

check("'foo'; 'bar'; \"baz\"", { quotes: 'double' });
// output  : 'foo';'bar';"baz";
// expected: "foo";"bar";"baz";

Description

according to documentation, you can provide a quotes option to the generate method in babel-generate. if not specified, it should autodetect based on the tokens in ast.

first of all, currently it doesn't detect based on the tokens in ast but on the code parameter in the generate function. This means this parameter can't be left empty.

second (and the actual issue), the detection doesn't work, quotes are preserved from input to output. the generate method doesn't apply the detected preference and neither when explicitly specified in the options.