element-vir/dist/declarative-element/directives/directive-helpers.js

Heroic. Reactive. Declarative. Type safe. Web components without compromise.

import { PartType, } from '../../lit-exports/all-lit-exports.js';
/**
 * Extracts the element from the given part info. Used in lit directives.
 *
 * @category Internal
 */
export function extractElement(partInfo, directiveName) {
    assertIsElementPartInfo(partInfo, directiveName);
    const element = partInfo.element;
    return element;
}
function getPartHostTagName(partInfo) {
    try {
        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
        const tagName = partInfo.options.host.tagName.toLowerCase();
        return tagName;
    }
    catch {
        return undefined;
    }
}
/**
 * Asserts that the given part info is an instance of {@link FullElementPartInfo}.
 *
 * @category Internal
 */
export function assertIsElementPartInfo(partInfo, directiveName) {
    const hostTagName = getPartHostTagName(partInfo);
    const hostTagMessage = hostTagName ? `: in ${hostTagName}` : '';
    if (partInfo.type !== PartType.ELEMENT) {
        throw new Error(`${directiveName} directive can only be attached directly to an element${hostTagMessage}.`);
    }
    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
    if (!partInfo.element) {
        throw new Error(`${directiveName} directive found no element${hostTagMessage}.`);
    }
}