[babel.generate]: generate convert ast to code

Bug Report

• I would like to work on a fix!

Current behavior

• Codesandbox

first, I use babel parse a angular module which decorators before export

const preCode = `
    @NgModule({})
    export class AppModule {};
  `;
  const ast = parse(preCode, {
    sourceType: "module",
    plugins: [
      "decorators-legacy" // decoratorsBeforeExport: true
    ]
  });

then, I use generate to convert ast to code.

const code = generate(ast).code;
// export @NgModule({})
// class AppModule {}

but code by generate is export before decorators

Expected behavior

I expect generate could support a option like decoratorsBeforeExport or decorators-legacy

Environment

• Babel version(s): [7+]
• Node/npm version: [ Node 10+/npm 6+]
• OS: [Mac OS]

Possible Solution

I hope someone can tell me how to do it。

[AjayPoshak]

@nicolo-ribaudo I would like to raise a PR to document the above option.

[babel-bot]

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