Add AllowNewTargetOutsideFunction option

Author: adams85

src/Acornima/Parser.State.cs

@@ -298,7 +298,8 @@ private bool AllowNewDotTarget()
     {
         // https://github.com/acornjs/acorn/blob/8.11.3/acorn/src/state.js > `get allowNewDotTarget`
 
-        return (CurrentThisScope(out _).Flags & (ScopeFlags.Function | ScopeFlags.ClassStaticBlock | ScopeFlags.InClassFieldInit)) != 0;
+        return _options.AllowNewTargetOutsideFunction
+            || (CurrentThisScope(out _).Flags & (ScopeFlags.Function | ScopeFlags.ClassStaticBlock | ScopeFlags.InClassFieldInit)) != 0;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]

src/Acornima/ParserOptions.cs

@@ -87,6 +87,13 @@ public EcmaVersion EcmaVersion
     /// </remarks>
     public bool AllowAwaitOutsideFunction { get => _allowAwaitOutsideFunction; init => _allowAwaitOutsideFunction = value; }
 
+    internal readonly bool _allowNewTargetOutsideFunction;
+    /// <summary>
+    /// Gets or sets whether to allow new.target meta-properties in the top-level scope.
+    /// Defaults to <see langword="false"/>.
+    /// </summary>
+    public bool AllowNewTargetOutsideFunction { get => _allowNewTargetOutsideFunction; init => _allowNewTargetOutsideFunction = value; }
+
     internal readonly bool _allowSuperOutsideMethod;
     /// <summary>
     /// Gets or sets whether to allow super identifiers to appear outside methods.