Since ECMA-262 5ed, the property accessor syntax was changed to be an IdentifierName. IdentifierName allows for a reserved word to be used. Previously (in es3) it was a "Identifier" which excluded reserved keywords.
This means that it's valid ES5 to have a function named "delete" as long as it's part of a property. (e.g. delete() is invalid, but x.delete() is fine).
This affects interop forms like `(axios/delete)` or `(js/window.axios.delete)`.