napi property attributes

typedef enum {
  napi_default = 0,
  napi_writable = 1 << 0,
  napi_enumerable = 1 << 1,
  napi_configurable = 1 << 2,
  // Used with napi_define_class to distinguish static properties
  // from instance properties. Ignored by napi_define_properties.
  napi_static = 1 << 10,
  // Default for class methods.
  napi_default_method = napi_writable | napi_configurable,
  // Default for object properties, like in JS obj[prop].
  napi_default_property = napi_writable |
                          napi_enumerable |
                          napi_configurable,
} napi_property_attributes;

napi_property_attributes are flags used to control the behavior of properties set on a JavaScript object. Other than napi_static they correspond to the attributes listed in [Section 6.1.7.1][] of the [ECMAScript Language Specification][]. They can be one or more of the following bitflags:

• napi_default: No explicit attributes are set on the property. By default, a property is read only, not enumerable and not configurable.
• napi_writable: The property is writable.
• napi_enumerable: The property is enumerable.
• napi_configurable: The property is configurable as defined in [Section 6.1.7.1][] of the [ECMAScript Language Specification][].
• napi_static: The property will be defined as a static property on a class as opposed to an instance property, which is the default. This is used only by [napi_define_class][]. It is ignored by napi_define_properties.
• napi_default_method: Like a method in a JS class, the property is configurable and writeable, but not enumerable.
• napi_default_property: Like a property set via assignment in JavaScript, the property is writable, enumerable, and configurable.