Method addJavaScriptFilter

src/UserConfig.js:401–409

(name, callback)

	}

	addJavaScriptFilter(name, callback) {
		this.#add(this.javascript.filters, name, callback, {
			description: "JavaScript Filter",
			functionName: "addJavaScriptFilter",
		});

		// Backwards compat for a time before `addJavaScriptFilter` existed.
		this.addJavaScriptFunction(name, callback);
	}

	addFilter(name, callback) {
		// This method *requires* `async function` and will not work with `function` that returns a promise