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/**
* @license
* Copyright 2018 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
import { AttributePart, noChange } from '../lit-html.js';
import { Directive, DirectiveParameters, PartInfo } from '../directive.js';
/**
* A key-value set of class names to truthy values.
*/
export interface ClassInfo {
readonly [name: string]: string | boolean | number;
}
declare class ClassMapDirective extends Directive {
/**
* Stores the ClassInfo object applied to a given AttributePart.
* Used to unset existing values when a new ClassInfo object is applied.
*/
private _previousClasses?;
private _staticClasses?;
constructor(partInfo: PartInfo);
render(classInfo: ClassInfo): string;
update(part: AttributePart, [classInfo]: DirectiveParameters<this>): string | typeof noChange;
}
/**
* A directive that applies dynamic CSS classes.
*
* This must be used in the `class` attribute and must be the only part used in
* the attribute. It takes each property in the `classInfo` argument and adds
* the property name to the element's `classList` if the property value is
* truthy; if the property value is falsey, the property name is removed from
* the element's `class`.
*
* For example `{foo: bar}` applies the class `foo` if the value of `bar` is
* truthy.
*
* @param classInfo
*/
export declare const classMap: (classInfo: ClassInfo) => import("../directive.js").DirectiveResult<typeof ClassMapDirective>;
/**
* The type of the class that powers this directive. Necessary for naming the
* directive's return type.
*/
export type { ClassMapDirective };
//# sourceMappingURL=class-map.d.ts.map
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