I find it a little unintuitive that if you apply a decorator to a method (or other target construct such as a class), the method's location data does not include the decorator, given that the decorators: [] array is a property of the node.

Both the TypeScript and Flow parsers (the only others I believe support decorators) behave differently to Babylon here, their relevant method node location includes the decorator content.

I could not find any guidance on location data within https://github.com/tc39/proposal-decorators

Was this behaviour explicitly discussed and decided on in Babylon? Are there other precedents of nested nodes "overflowing" their parents?

Example Code

class Other {
    @foo({ baz: true })
    static get bar() { return this._bar; }
}

Live example: http://astexplorer.net/#/gist/c7692dd145ef9aaa2c9600f976257a2a/bf55ed4537b7520a6c19045d7e9fa4e6f3f11d14

...take a look at the highlighted method for Bablyon vs TypeScript and Flow (and the location data in the AST of course).