Nowhere in the docs does it say that `this.refs` is a reserved property name

When creating multiple refs for a component class, it isn't unlikely that an unaware developer, wanting to add an array of refs to their component, would choose to use the property name this.refs.

It seems however that React uses this property name internally and so assigning to this.refs in the constructor will be irreversibly overwritten by an empty object {}. Other (not-obviously-reserved) names are fine, including singular this.ref.

I assume that this isn't a bug with react (although maybe?), but this constraint isn't mentioned explicitly in the Reactjs.org docs. The only mention of this.refs is a small section on the Refs page of the docs titled "Legacy API: String Refs", which does explain that this.refs was used in a deprecated API, but doesn't explicitly say that the name .refs is still reserved and can't be used.

It should probably be mentioned explicitly somewhere on that page, preferably both near the top and in that particular section. It took me quite a while of debugging to incidentally try a different name and stumble upon this issue. There are also several StackOverflow questions from other people asking why their refs aren't working when they are using this.refs but none of the people answering seem to be aware of this constraint.

Refs ページと、現在 this.refs について予約名の制約を明示的に説明していない「Legacy API: String Refs」セクションから始めます。ドキュメントの上部付近とそのセクションを更新し、this.refs が予約されており、上書きすべきではないことを読者が把握できるようにします。