import { ENV } from '@ember/-internals/environment';
import { assign } from '@ember/polyfills';
/**
  Set `EmberENV.FEATURES` in your application's `config/environment.js` file
  to enable canary features in your application.

  See the [feature flag guide](https://guides.emberjs.com/release/configuring-ember/feature-flags/)
  for more details.

  @module @ember/canary-features
  @public
*/
export const DEFAULT_FEATURES = {
    EMBER_LIBRARIES_ISREGISTERED: false,
    EMBER_IMPROVED_INSTRUMENTATION: false,
    EMBER_GLIMMER_NAMED_ARGUMENTS: true,
    EMBER_ROUTING_ROUTER_SERVICE: true,
    EMBER_ENGINES_MOUNT_PARAMS: true,
    EMBER_MODULE_UNIFICATION: false,
    GLIMMER_CUSTOM_COMPONENT_MANAGER: true,
    EMBER_TEMPLATE_BLOCK_LET_HELPER: true,
    EMBER_METAL_TRACKED_PROPERTIES: false,
    EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION: true,
};
/**
  The hash of enabled Canary features. Add to this, any canary features
  before creating your application.

  @class FEATURES
  @static
  @since 1.1.0
  @public
*/
export const FEATURES = assign(DEFAULT_FEATURES, ENV.FEATURES);
/**
  Determine whether the specified `feature` is enabled. Used by Ember's
  build tools to exclude experimental features from beta/stable builds.

  You can define the following configuration options:

  * `EmberENV.ENABLE_OPTIONAL_FEATURES` - enable any features that have not been explicitly
    enabled/disabled.

  @method isEnabled
  @param {String} feature The feature to check
  @return {Boolean}
  @since 1.1.0
  @public
*/
export function isEnabled(feature) {
    let featureValue = FEATURES[feature];
    if (featureValue === true || featureValue === false) {
        return featureValue;
    }
    else if (ENV.ENABLE_OPTIONAL_FEATURES) {
        return true;
    }
    else {
        return false;
    }
}
function featureValue(value) {
    if (ENV.ENABLE_OPTIONAL_FEATURES && value === null) {
        return true;
    }
    return value;
}
export const EMBER_LIBRARIES_ISREGISTERED = featureValue(FEATURES.EMBER_LIBRARIES_ISREGISTERED);
export const EMBER_IMPROVED_INSTRUMENTATION = featureValue(FEATURES.EMBER_IMPROVED_INSTRUMENTATION);
export const EMBER_GLIMMER_NAMED_ARGUMENTS = featureValue(FEATURES.EMBER_GLIMMER_NAMED_ARGUMENTS);
export const EMBER_ROUTING_ROUTER_SERVICE = featureValue(FEATURES.EMBER_ROUTING_ROUTER_SERVICE);
export const EMBER_ENGINES_MOUNT_PARAMS = featureValue(FEATURES.EMBER_ENGINES_MOUNT_PARAMS);
export const EMBER_MODULE_UNIFICATION = featureValue(FEATURES.EMBER_MODULE_UNIFICATION);
export const EMBER_METAL_TRACKED_PROPERTIES = featureValue(FEATURES.EMBER_METAL_TRACKED_PROPERTIES);
export const GLIMMER_CUSTOM_COMPONENT_MANAGER = featureValue(FEATURES.GLIMMER_CUSTOM_COMPONENT_MANAGER);
export const EMBER_TEMPLATE_BLOCK_LET_HELPER = featureValue(FEATURES.EMBER_TEMPLATE_BLOCK_LET_HELPER);
export const EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION = featureValue(FEATURES.EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION);