Add toError utility function (#523)

* Add asError utility function

* Rename to toError

1 files changed, 26 insertions, 0 deletions

diff --git a/ext/js/core/to-error.js b/ext/js/core/to-error.js
new file mode 100644
index 00000000..4866c3da
--- /dev/null
+++ b/ext/js/core/to-error.js
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2023  Yomitan Authors
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * Utility function to convert an unknown value to an error.
+ * This is useful for try-catch situations where the catch parameter has the `unknown` type.
+ * @param {unknown} value
+ * @returns {Error}
+ */
+export function toError(value) {
+    return value instanceof Error ? value : new Error(`${value}`);
+}