Move stringReplaceAsync

It is only used in AnkiNoteBuilder and it was originally created
for this purpose.

.eslintrc.json

@@ -86,7 +86,6 @@
                 "toIterable": "readonly",
                 "stringReverse": "readonly",
                 "promiseTimeout": "readonly",
-                "stringReplaceAsync": "readonly",
                 "parseUrl": "readonly",
                 "EventDispatcher": "readonly",
                 "EventListenerCollection": "readonly",

ext/bg/js/anki-note-builder.js

@@ -93,7 +93,7 @@ class AnkiNoteBuilder {
         };
         const markers = this._markers;
         const pattern = /\{([\w-]+)\}/g;
-        return await stringReplaceAsync(field, pattern, async (g0, marker) => {
+        return await AnkiNoteBuilder.stringReplaceAsync(field, pattern, async (g0, marker) => {
             if (!markers.has(marker)) {
                 return g0;
             }
@@ -106,4 +106,19 @@ class AnkiNoteBuilder {
             }
         });
     }
+
+    static stringReplaceAsync(str, regex, replacer) {
+        let match;
+        let index = 0;
+        const parts = [];
+        while ((match = regex.exec(str)) !== null) {
+            parts.push(str.substring(index, match.index), replacer(...match, match.index, str));
+            index = regex.lastIndex;
+        }
+        if (parts.length === 0) {
+            return Promise.resolve(str);
+        }
+        parts.push(str.substring(index));
+        return Promise.all(parts).then((v) => v.join(''));
+    }
 }

ext/mixed/js/core.js

@@ -175,21 +175,6 @@ function promiseTimeout(delay, resolveValue) {
     return promise;
 }
 
-function stringReplaceAsync(str, regex, replacer) {
-    let match;
-    let index = 0;
-    const parts = [];
-    while ((match = regex.exec(str)) !== null) {
-        parts.push(str.substring(index, match.index), replacer(...match, match.index, str));
-        index = regex.lastIndex;
-    }
-    if (parts.length === 0) {
-        return Promise.resolve(str);
-    }
-    parts.push(str.substring(index));
-    return Promise.all(parts).then((v) => v.join(''));
-}
-
 
 /*
  * Common events