Mapping reserved props names when using named props

1

I am looking to make the name of a prop to a binding map without the underscore.

I have used the @bs.as decorator in the past, but this was for a record not a named argument to a function. How would I map ~format_ to format when its passed to the binding?

type number

@bs.obj
external number: (
  ~id: string=?,
  ~placeholder: string=?,
  ~style: string=?,
  ~type_: string=?,
  ~format_: string=?,
  unit,
) => number = ""

@bs.obj
external props: (~number: number=?, ~cvv: cvv=?, unit) => props = ""

@bs.new external create: (string, props) => fattJs = "FattJs"

Thanks in advance!

2

There is no way to rename fields with bs.obj. However bs.deriving in abstract form will do almost the exact same thing bs.obj does, and is defined with record syntax.

@bs.deriving({abstract: light})
type number = {
  @bs.optional
  id: string,
  @bs.optional
  placeholder: string,
  @bs.optional
  style: string,
  @bs.optional @bs.as("type")
  numberType: string,
  @bs.optional @bs.as("format")
  numberFormat: string,
}

Js.log(number(~numberType="int", ()))
3

Why do you add a _ to format? Is it a keyword? You probably want to special case type properly, like this:

type number

@bs.obj
external number: (
  ~format: string=?,
  ~_type: string=?,
  unit,
) => number = ""

let a = number(~format="test", ~_type="test", ())

which transforms to following JS:

var a = {
  format: "test",
  type: "test"
};

exports.a = a;

Playground Link here

Preceding _ are stripped from the labeled argument in this case.

1 Like
4

Ah! I thought I saw somewhere that the underscores were escaped, but I guess I missed that it needs to be a prefix :+1:t2:

As for format, I was not 100% sure if it was reserved as vim did some highlighting haha :joy: