Method addAsyncFilter

src/UserConfig.js:443–462

(name, callback)

	// Liquid, Nunjucks, and JS only
	addAsyncFilter(name, callback) {
		// namespacing happens downstream
		this.#add(this.universal.filters, name, callback, {
			description: "Universal Filter",
			functionName: "addAsyncFilter",
		});

		this.addLiquidFilter(name, callback);
		this.addJavaScriptFilter(name, callback);
		this.addNunjucksAsyncFilter(
			name,
			/** @this {any} */
			async function (...args) {
				let cb = args.pop();
				// Note that `callback` is already a function as the `#add` method throws an error if not.
				let ret = await callback.call(this, ...args);
				cb(null, ret);
			},
		);
	}

	/*
	 * Shortcodes