Add import/export/deletion of logit bias presets

public/scripts/utils.js

@@ -10,6 +10,7 @@ export {
     isSubsetOf,
     incrementString,
     stringFormat,
+    parseJsonFile,
 };
 
 /// UTILS
@@ -63,6 +64,15 @@ function getBase64Async(file) {
     });
 }
 
+async function parseJsonFile(file) {
+    return new Promise((resolve, reject) => {
+        const fileReader = new FileReader();
+        fileReader.onload = event => resolve(JSON.parse(event.target.result));
+        fileReader.onerror = error => reject(error);
+        fileReader.readAsText(file);
+    });
+}
+
 function getStringHash(str, seed = 0) {
     let h1 = 0xdeadbeef ^ seed,
         h2 = 0x41c6ce57 ^ seed;