import { isBlank } from 'angular2/src/facade/lang';
/**
 * Describes the current state of the change detector.
 */
export var ChangeDetectorState;
(function (ChangeDetectorState) {
    /**
     * `NeverChecked` means that the change detector has not been checked yet, and
     * initialization methods should be called during detection.
     */
    ChangeDetectorState[ChangeDetectorState["NeverChecked"] = 0] = "NeverChecked";
    /**
     * `CheckedBefore` means that the change detector has successfully completed at least
     * one detection previously.
     */
    ChangeDetectorState[ChangeDetectorState["CheckedBefore"] = 1] = "CheckedBefore";
    /**
     * `Errored` means that the change detector encountered an error checking a binding
     * or calling a directive lifecycle method and is now in an inconsistent state. Change
     * detectors in this state will no longer detect changes.
     */
    ChangeDetectorState[ChangeDetectorState["Errored"] = 2] = "Errored";
})(ChangeDetectorState || (ChangeDetectorState = {}));
/**
 * Describes within the change detector which strategy will be used the next time change
 * detection is triggered.
 */
export var ChangeDetectionStrategy;
(function (ChangeDetectionStrategy) {
    /**
     * `CheckedOnce` means that after calling detectChanges the mode of the change detector
     * will become `Checked`.
     */
    ChangeDetectionStrategy[ChangeDetectionStrategy["CheckOnce"] = 0] = "CheckOnce";
    /**
     * `Checked` means that the change detector should be skipped until its mode changes to
     * `CheckOnce`.
     */
    ChangeDetectionStrategy[ChangeDetectionStrategy["Checked"] = 1] = "Checked";
    /**
     * `CheckAlways` means that after calling detectChanges the mode of the change detector
     * will remain `CheckAlways`.
     */
    ChangeDetectionStrategy[ChangeDetectionStrategy["CheckAlways"] = 2] = "CheckAlways";
    /**
     * `Detached` means that the change detector sub tree is not a part of the main tree and
     * should be skipped.
     */
    ChangeDetectionStrategy[ChangeDetectionStrategy["Detached"] = 3] = "Detached";
    /**
     * `OnPush` means that the change detector's mode will be set to `CheckOnce` during hydration.
     */
    ChangeDetectionStrategy[ChangeDetectionStrategy["OnPush"] = 4] = "OnPush";
    /**
     * `Default` means that the change detector's mode will be set to `CheckAlways` during hydration.
     */
    ChangeDetectionStrategy[ChangeDetectionStrategy["Default"] = 5] = "Default";
})(ChangeDetectionStrategy || (ChangeDetectionStrategy = {}));
/**
 * List of possible {@link ChangeDetectionStrategy} values.
 */
export var CHANGE_DETECTION_STRATEGY_VALUES = [
    ChangeDetectionStrategy.CheckOnce,
    ChangeDetectionStrategy.Checked,
    ChangeDetectionStrategy.CheckAlways,
    ChangeDetectionStrategy.Detached,
    ChangeDetectionStrategy.OnPush,
    ChangeDetectionStrategy.Default
];
/**
 * List of possible {@link ChangeDetectorState} values.
 */
export var CHANGE_DETECTOR_STATE_VALUES = [
    ChangeDetectorState.NeverChecked,
    ChangeDetectorState.CheckedBefore,
    ChangeDetectorState.Errored
];
export function isDefaultChangeDetectionStrategy(changeDetectionStrategy) {
    return isBlank(changeDetectionStrategy) ||
        changeDetectionStrategy === ChangeDetectionStrategy.Default;
}
