diff --git a/src/client/util/util-webkit.vala b/src/client/util/util-webkit.vala
index cfce6f37..79bdd3ba 100644
--- a/src/client/util/util-webkit.vala
+++ b/src/client/util/util-webkit.vala
@@ -32,18 +32,10 @@ namespace WebKitUtil {
      * This will raise a {@link Geary.JS.Error.TYPE} error if the
      * result is not a JavaScript `Number`.
      */
-    public double to_number(WebKit.JavascriptResult result)
+    public inline double to_number(WebKit.JavascriptResult result)
         throws Geary.JS.Error {
-        JS.GlobalContext context = result.get_global_context();
-        JS.Value value = result.get_value();
-        if (!value.is_number(context)) {
-            throw new Geary.JS.Error.TYPE("Result is not a JS Number object");
-        }
-
-        JS.Value? err = null;
-        double number = value.to_number(context, out err);
-        Geary.JS.check_exception(context, err);
-        return number;
+        return Geary.JS.to_number(result.get_global_context(),
+                                  result.get_value());
     }
 
     /**
@@ -52,19 +44,10 @@ namespace WebKitUtil {
      * This will raise a {@link Geary.JS.Error.TYPE} error if the
      * result is not a JavaScript `String`.
      */
-    public string? to_string(WebKit.JavascriptResult result)
+    public inline string to_string(WebKit.JavascriptResult result)
         throws Geary.JS.Error {
-        JS.GlobalContext context = result.get_global_context();
-        JS.Value js_str_value = result.get_value();
-        if (!js_str_value.is_string(context)) {
-            throw new Geary.JS.Error.TYPE("Result is not a JS String object");
-        }
-
-        JS.Value? err = null;
-        JS.String js_str = js_str_value.to_string_copy(context, out err);
-        Geary.JS.check_exception(context, err);
-
-        return Geary.JS.to_string_released(js_str);
+        return Geary.JS.to_string(result.get_global_context(),
+                                  result.get_value());
     }
 
     /**
@@ -74,7 +57,7 @@ namespace WebKitUtil {
      * result to a string, effectively by calling the JavaScript
      * `toString()` method on it, and returning that value.
      */
-    public string? as_string(WebKit.JavascriptResult result)
+    public string as_string(WebKit.JavascriptResult result)
         throws Geary.JS.Error {
         JS.GlobalContext context = result.get_global_context();
         JS.Value js_str_value = result.get_value();
diff --git a/src/engine/util/util-js.vala b/src/engine/util/util-js.vala
index ddcf8d4f..a25e3308 100644
--- a/src/engine/util/util-js.vala
+++ b/src/engine/util/util-js.vala
@@ -36,6 +36,45 @@ namespace Geary.JS {
         return (js == null || js.get_type(context) == global::JS.Type.NULL);
     }
 
+    /**
+     * Returns a JSC Value as a number.
+     *
+     * This will raise a {@link Geary.JS.Error.TYPE} error if the
+     * value is not a JavaScript `Number`.
+     */
+    public double to_number(global::JS.Context context,
+                            global::JS.Value value)
+        throws Geary.JS.Error {
+        if (!value.is_number(context)) {
+            throw new Geary.JS.Error.TYPE("Value is not a JS Number object");
+        }
+
+        global::JS.Value? err = null;
+        double number = value.to_number(context, out err);
+        Geary.JS.check_exception(context, err);
+        return number;
+    }
+
+    /**
+     * Returns a JSC Value as a string.
+     *
+     * This will raise a {@link Geary.JS.Error.TYPE} error if the
+     * value is not a JavaScript `String`.
+     */
+    public string to_string(global::JS.Context context,
+                            global::JS.Value value)
+        throws Geary.JS.Error {
+        if (!value.is_string(context)) {
+            throw new Geary.JS.Error.TYPE("Value is not a JS String object");
+        }
+
+        global::JS.Value? err = null;
+        global::JS.String js_str = value.to_string_copy(context, out err);
+        Geary.JS.check_exception(context, err);
+
+        return Geary.JS.to_string_released(js_str);
+    }
+
     /**
      * Returns a JSC {@link JS.String} as a Vala {@link string}.
      */