Emits fallback clauses for modules that define prototype or static properties.

Uniform macros for defining JS builtins in all contexts.

All builtins use 2-arity fn args, this -> convention.

Module-level dispatch (generates def clauses)

proto "push" do ... end         # → def proto_property("push")
static "isArray" do ... end     # → def static_property("isArray")
static_val "PI", :math.pi()    # → def static_property("PI"), do: value

Named object (generates def object/0)

js_object "Math" do
  method "floor" do ... end
  val "PI", :math.pi()
end

Inline maps and objects

build_methods do              # returns %{"name" => {:builtin, ...}, ...}
  method "add" do ... end
  args_method "from", &from_args/1
  receiver_method "slice", &slice/2
  this_method "toJSON", &to_json/1
  symbol_method "Symbol.iterator" do ... end
  accessor "size" do
    get do ... end
  end
  prop "size", 0
end

object do                     # returns Heap.wrap(%{"name" => {:builtin, ...}, ...})
  prop "type", type
  method "preventDefault" do ... end
end

object heap: false do         # returns the raw map for post-processing
  prop "searchParams", search_params
end

constructor "DOMException", &build_dom_exception/2 do
  proto do
    extends build_error_proto()
  end
end

args and this are injected in all proto/static/method bodies. arg/3, argv/2, builtin_*, and iterator_from/1 cover the repeated argument-defaulting, function-wrapping, and iterator boilerplate used by Web APIs. Catch-all fallbacks are auto-generated by @before_compile.

Returns a positional argument with a JavaScript :undefined default.

Builds a raw map of builtin method/property entries.

Builds a heap-wrapped object from builtin method/property entries.

Wraps a two-arity callback in the VM builtin tuple representation.

Wraps a receiver-only callback in the VM builtin tuple representation.

Dispatches a VM callable value to its underlying Elixir callback.

Returns whether a VM value can be called as a JavaScript function.

Registers a JavaScript constructor and optional prototype definition.

Defines a named builtin object exported by object/0.

Defines a prototype property as a JavaScript builtin function.

Defines a constructor/static property as a JavaScript builtin function.

Defines a constructor/static property as a fixed value.