add basic recursive variable replacer

Author: ebiggz

src/helpers/variable-replacer.ts

@@ -0,0 +1,36 @@
+import { isJSONEncodable } from 'discord.js';
+
+export function replaceVariables<T>(
+    variableMap: Record<string, unknown>,
+    obj: T
+): T {
+    if (typeof obj === 'string') {
+        return replaceVariablesInString(variableMap, obj) as unknown as T;
+    }
+
+    if (Array.isArray(obj)) {
+        return obj.map((item) =>
+            replaceVariables(variableMap, item)
+        ) as unknown as T;
+    }
+
+    if (typeof obj === 'object') {
+        const newObj = isJSONEncodable(obj) ? (obj.toJSON() as T) : { ...obj };
+        for (const key in newObj) {
+            newObj[key] = replaceVariables(variableMap, newObj[key]);
+        }
+        return newObj;
+    }
+
+    return obj;
+}
+
+export function replaceVariablesInString(
+    variables: Record<string, unknown>,
+    str: string
+): string {
+    Object.entries(variables).forEach(([key, value]) => {
+        str = str.replaceAll(key, value?.toString());
+    });
+    return str;
+}