/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Directive, Inject, InjectionToken, Optional, TemplateRef, ViewContainerRef, } from '@angular/core';
import { CdkPortal } from '@angular/cdk/portal';
import * as i0 from "@angular/core";
/**
 * Injection token that can be used to reference instances of `MatTabLabel`. It serves as
 * alternative token to the actual `MatTabLabel` class which could cause unnecessary
 * retention of the class and its directive metadata.
 */
export const MAT_TAB_LABEL = new InjectionToken('MatTabLabel');
/**
 * Used to provide a tab label to a tab without causing a circular dependency.
 * @docs-private
 */
export const MAT_TAB = new InjectionToken('MAT_TAB');
/** Used to flag tab labels for use with the portal directive */
export class MatTabLabel extends CdkPortal {
    constructor(templateRef, viewContainerRef, _closestTab) {
        super(templateRef, viewContainerRef);
        this._closestTab = _closestTab;
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MatTabLabel, deps: [{ token: i0.TemplateRef }, { token: i0.ViewContainerRef }, { token: MAT_TAB, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
    static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: MatTabLabel, selector: "[mat-tab-label], [matTabLabel]", providers: [{ provide: MAT_TAB_LABEL, useExisting: MatTabLabel }], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MatTabLabel, decorators: [{
            type: Directive,
            args: [{
                    selector: '[mat-tab-label], [matTabLabel]',
                    providers: [{ provide: MAT_TAB_LABEL, useExisting: MatTabLabel }],
                }]
        }], ctorParameters: function () { return [{ type: i0.TemplateRef }, { type: i0.ViewContainerRef }, { type: undefined, decorators: [{
                    type: Inject,
                    args: [MAT_TAB]
                }, {
                    type: Optional
                }] }]; } });
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