From 9d23ba0a22fe3d1561b7860dc3aefadef72a4514 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sun, 24 Jan 2021 21:48:51 +0000
Subject: support exponentiation operator (#4593)

---
 lib/parse.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'lib/parse.js')

diff --git a/lib/parse.js b/lib/parse.js
index 64307a95..38c56d8f 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -81,6 +81,7 @@ var OPERATORS = makePredicate([
     "*",
     "/",
     "%",
+    "**",
     ">>",
     "<<",
     ">>>",
@@ -630,7 +631,8 @@ var PRECEDENCE = function(a, ret) {
     ["<", ">", "<=", ">=", "in", "instanceof"],
     [">>", "<<", ">>>"],
     ["+", "-"],
-    ["*", "/", "%"]
+    ["*", "/", "%"],
+    ["**"],
 ], {});
 
 var ATOMIC_START_TOKEN = makePredicate("atom bigint num regexp string");
@@ -1860,7 +1862,7 @@ function parse($TEXT, options) {
         var prec = op != null ? PRECEDENCE[op] : null;
         if (prec != null && prec > min_prec) {
             next();
-            var right = expr_op(maybe_await(), prec, no_in);
+            var right = expr_op(maybe_await(), op == "**" ? prec - 1 : prec, no_in);
             return expr_op(new AST_Binary({
                 start    : left.start,
                 left     : left,
-- 
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