lit-html/development/directive.js

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
export const PartType = {
    ATTRIBUTE: 1,
    CHILD: 2,
    PROPERTY: 3,
    BOOLEAN_ATTRIBUTE: 4,
    EVENT: 5,
    ELEMENT: 6,
};
/**
 * Creates a user-facing directive function from a Directive class. This
 * function has the same parameters as the directive's render() method.
 */
export const directive = (c) => (...values) => ({
    // This property needs to remain unminified.
    ['_$litDirective$']: c,
    values,
});
/**
 * Base class for creating custom directives. Users should extend this class,
 * implement `render` and/or `update`, and then pass their subclass to
 * `directive`.
 */
export class Directive {
    constructor(_partInfo) { }
    // See comment in Disconnectable interface for why this is a getter
    get _$isConnected() {
        return this._$parent._$isConnected;
    }
    /** @internal */
    _$initialize(part, parent, attributeIndex) {
        this.__part = part;
        this._$parent = parent;
        this.__attributeIndex = attributeIndex;
    }
    /** @internal */
    _$resolve(part, props) {
        return this.update(part, props);
    }
    update(_part, props) {
        return this.render(...props);
    }
}
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