From 6cd060caad0415d56a486d0090d489374e9e1dbd Mon Sep 17 00:00:00 2001
From: Oleksandr Tarasiuk <oleksandr.tarasiuk@outlook.com>
Date: Sat, 28 Jun 2025 00:13:44 +0300
Subject: [PATCH] Port TS PR 61764

---
 internal/parser/parser.go | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/internal/parser/parser.go b/internal/parser/parser.go
index 446b22ff6b..1207d93fc5 100644
--- a/internal/parser/parser.go
+++ b/internal/parser/parser.go
@@ -6332,16 +6332,26 @@ func (p *Parser) isUsingDeclaration() bool {
 	// 'using' always starts a lexical declaration if followed by an identifier. We also eagerly parse
 	// |ObjectBindingPattern| so that we can report a grammar error during check. We don't parse out
 	// |ArrayBindingPattern| since it potentially conflicts with element access (i.e., `using[x]`).
-	return p.lookAhead((*Parser).nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine)
+	return p.lookAhead(func(p *Parser) bool {
+		return p.nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine( /*disallowOf*/ false)
+	})
 }
 
-func (p *Parser) nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine() bool {
+func (p *Parser) nextTokenIsEqualsOrSemicolonOrColonToken() bool {
 	p.nextToken()
+	return p.token == ast.KindEqualsToken || p.token == ast.KindSemicolonToken || p.token == ast.KindColonToken
+}
+
+func (p *Parser) nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine(disallowOf bool) bool {
+	p.nextToken()
+	if disallowOf && p.token == ast.KindOfKeyword {
+		return p.lookAhead((*Parser).nextTokenIsEqualsOrSemicolonOrColonToken)
+	}
 	return p.isBindingIdentifier() || p.token == ast.KindOpenBraceToken && !p.hasPrecedingLineBreak()
 }
 
 func (p *Parser) nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLineDisallowOf() bool {
-	return p.nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine() && p.token != ast.KindOfKeyword
+	return p.nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine( /*disallowOf*/ true)
 }
 
 func (p *Parser) isAwaitUsingDeclaration() bool {
@@ -6349,7 +6359,7 @@ func (p *Parser) isAwaitUsingDeclaration() bool {
 }
 
 func (p *Parser) nextIsUsingKeywordThenBindingIdentifierOrStartOfObjectDestructuringOnSameLine() bool {
-	return p.nextToken() == ast.KindUsingKeyword && p.nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine()
+	return p.nextToken() == ast.KindUsingKeyword && p.nextTokenIsBindingIdentifierOrStartOfDestructuringOnSameLine( /*disallowOf*/ false)
 }
 
 func (p *Parser) nextTokenIsTokenStringLiteral() bool {