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diff --git a/common/once.js b/common/once.js
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-/**
- * This file is part of Haketilo.
- *
- * Function: Wrap APIs that depend on some asynchronous initialization into
- *     promises.
- *
- * Copyright (C) 2021 Wojtek Kosior
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * As additional permission under GNU GPL version 3 section 7, you
- * may distribute forms of that code without the copy of the GNU
- * GPL normally required by section 4, provided you include this
- * license notice and, in case of non-source distribution, a URL
- * through which recipients can access the Corresponding Source.
- * If you modify file(s) with this exception, you may extend this
- * exception to your version of the file(s), but you are not
- * obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * As a special exception to the GPL, any HTML file which merely
- * makes function calls to this code, and for that purpose
- * includes it by reference shall be deemed a separate work for
- * copyright law purposes. If you modify this code, you may extend
- * this exception to your version of the code, but you are not
- * obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
- * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
- * license. Although I request that you do not make use of this code in a
- * proprietary program, I am not going to enforce this in court.
- */
-
-/*
- * This module provides an easy way to wrap an async function into a promise
- * so that it only gets executed once.
- */
-
-async function assign_result(state, result_producer)
-{
-    state.result = await result_producer();
-    state.ready = true;
-    for (let cb of state.waiting)
-	setTimeout(cb, 0, state.result);
-    state.waiting = undefined;
-}
-
-async function get_result(state)
-{
-    if (state.ready)
-	return state.result;
-
-    return new Promise((resolve, reject) => state.waiting.push(resolve));
-}
-
-function make_once(result_producer)
-{
-    let state = {waiting : [], ready : false, result : undefined};
-    assign_result(state, result_producer);
-    return () => get_result(state);
-}
-
-#EXPORT make_once