Add toError utility function (#523)

* Add asError utility function

* Rename to toError

2 files changed, 22 insertions, 3 deletions

diff --git a/dev/dictionary-validate.js b/dev/dictionary-validate.js
index 51edcc50..3727310e 100644
--- a/dev/dictionary-validate.js
+++ b/dev/dictionary-validate.js
@@ -23,6 +23,7 @@ import {performance} from 'perf_hooks';
 import {fileURLToPath} from 'url';
 import {parseJson} from './json.js';
 import {createJsonSchema} from './schema-validate.js';
+import {toError} from './to-error.js';
 
 const dirname = path.dirname(fileURLToPath(import.meta.url));
 
@@ -47,7 +48,7 @@ async function validateDictionaryBanks(mode, zip, fileNameFormat, schema) {
     try {
         jsonSchema = createJsonSchema(mode, schema);
     } catch (e) {
-        const e2 = e instanceof Error ? e : new Error(`${e}`);
+        const e2 = toError(e);
         e2.message += `\n(in file ${fileNameFormat})}`;
         throw e2;
     }
@@ -62,7 +63,7 @@ async function validateDictionaryBanks(mode, zip, fileNameFormat, schema) {
         try {
             jsonSchema.validate(data);
         } catch (e) {
-            const e2 = e instanceof Error ? e : new Error(`${e}`);
+            const e2 = toError(e);
             e2.message += `\n(in file ${fileName})}`;
             throw e2;
         }
@@ -92,7 +93,7 @@ export async function validateDictionary(mode, archive, schemas) {
         const jsonSchema = createJsonSchema(mode, schemas.index);
         jsonSchema.validate(index);
     } catch (e) {
-        const e2 = e instanceof Error ? e : new Error(`${e}`);
+        const e2 = toError(e);
         e2.message += `\n(in file ${indexFileName})}`;
         throw e2;
     }
diff --git a/dev/to-error.js b/dev/to-error.js
new file mode 100644
index 00000000..1cc84f50
--- /dev/null
+++ b/dev/to-error.js
@@ -0,0 +1,18 @@
+/*
+ * 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/>.
+ */
+
+export {toError} from '../ext/js/core/to-error.js';