@design.estate/dees-element/dist_ts/dees-element.classes.resolvedirective.js

A library for creating custom elements extending the lit element class with additional functionalities.

import { noChange } from 'lit';
import { AsyncDirective, directive } from 'lit/async-directive.js';
class ResolveDirective extends AsyncDirective {
    constructor() {
        super(...arguments);
        this.hasPromiseSettled = false;
    }
    render(promise) {
        if (this.promise !== promise) {
            this.promise = promise;
            if (this.isConnected) {
                this.handlePromise(promise);
            }
        }
        return noChange;
    }
    handlePromise(promise) {
        this.hasPromiseSettled = false;
        promise.then((value) => {
            if (this.promise === promise && !this.hasPromiseSettled) {
                this.setValue(value);
                this.hasPromiseSettled = true;
            }
        }).catch((error) => {
            if (this.promise === promise && !this.hasPromiseSettled) {
                this.setValue(error);
                this.hasPromiseSettled = true;
            }
        });
    }
    disconnected() {
        this.hasPromiseSettled = true; // prevent setting value if the promise settles after disconnection
    }
    reconnected() {
        if (!this.hasPromiseSettled) {
            this.handlePromise(this.promise);
        }
    }
}
export const resolve = directive(ResolveDirective);
export const resolveExec = (funcArg) => {
    return resolve(funcArg());
};
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