Compile-time Error: control may reach end of non-void function with Xcode 10.2

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temp solution :

add default: return "null"; between line 52 and 53,

inline const char *jsc::Value::typeof(JSContextRef ctx, const JSValueRef &value) {
    switch (JSValueGetType(ctx, value)) {
        case kJSTypeNull: return "null";
        case kJSTypeNumber: return "number";
        case kJSTypeObject: return "object";
        case kJSTypeString: return "string";
        case kJSTypeBoolean: return "boolean";
        case kJSTypeUndefined: return "undefined";
        default: return "null";

this working for me, waiting for the official solution