From 01aa078e9cae82e16aa1faad092dbd4fbce895e2 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 15 Mar 2021 13:53:48 +0000
Subject: [PATCH] support `**=` (#4778)

---
 lib/parse.js                    |  3 ++-
 test/compress/exponentiation.js | 22 ++++++++++++++++++++++
 test/ufuzz/index.js             |  3 ++-
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/lib/parse.js b/lib/parse.js
index 7bea41d8e1..06f3f840b5 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -100,6 +100,7 @@ var OPERATORS = makePredicate([
     "/=",
     "*=",
     "%=",
+    "**=",
     ">>=",
     "<<=",
     ">>>=",
@@ -652,7 +653,7 @@ var UNARY_PREFIX = makePredicate("typeof void delete -- ++ ! ~ - +");
 
 var UNARY_POSTFIX = makePredicate("-- ++");
 
-var ASSIGNMENT = makePredicate("= += -= /= *= %= >>= <<= >>>= |= ^= &=");
+var ASSIGNMENT = makePredicate("= += -= /= *= %= **= >>= <<= >>>= |= ^= &=");
 
 var PRECEDENCE = function(a, ret) {
     for (var i = 0; i < a.length;) {
diff --git a/test/compress/exponentiation.js b/test/compress/exponentiation.js
index 5de3c96473..1a678f520a 100644
--- a/test/compress/exponentiation.js
+++ b/test/compress/exponentiation.js
@@ -43,6 +43,28 @@ await: {
     node_version: ">=8"
 }
 
+assignment_1: {
+    input: {
+        var a = 2;
+        a **= 5;
+        console.log(a);
+    }
+    expect_exact: "var a=2;a**=5;console.log(a);"
+    expect_stdout: "32"
+    node_version: ">=8"
+}
+
+assignment_2: {
+    input: {
+        var a = 8n;
+        a **= a;
+        console.log(a);
+    }
+    expect_exact: "var a=8n;a**=a;console.log(a);"
+    expect_stdout: "16777216n"
+    node_version: ">=10"
+}
+
 evaluate: {
     options = {
         evaluate: true,
diff --git a/test/ufuzz/index.js b/test/ufuzz/index.js
index c38e33c7ab..c90eb55334 100644
--- a/test/ufuzz/index.js
+++ b/test/ufuzz/index.js
@@ -277,14 +277,15 @@ var ASSIGNMENTS = [
     "-=",
     "*=",
     "/=",
+    "%=",
     "&=",
     "|=",
     "^=",
     "<<=",
     ">>=",
     ">>>=",
-    "%=",
 ];
+if (SUPPORT.exponentiation) ASSIGNMENTS.push("**=");
 
 var UNARY_SAFE = [
     "+",