Implement boolean negation, array concatenation operators

src/transformers/index.js

@@ -82,7 +82,7 @@ let trivial = {
 		},
 		NixUnaryOperation: (_node, { defer }) => {
 			return defer((node) => {
-				if (node.operator === "-") {
+				if (node.operator === "-" || node.operator === "!") {
 					return types.unaryExpression(node.operator, node.argument, true);
 				} else {
 					throw new Error(`Unsupported operator: ${node.operator}`);
@@ -100,6 +100,11 @@ let trivial = {
 						types.spreadElement(node.left),
 						types.spreadElement(node.right)
 					]);
+				} else if (node.operator === "++") {
+					return types.arrayExpression([
+						types.spreadElement(node.left),
+						types.spreadElement(node.right)
+					]);
 				} else {
 					return types.binaryExpression(node.operator, node.left, node.right);
 				}