From c5df4e9477017a3be8fa007eae24d4170b595143 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
Date: Mon, 1 May 2023 21:00:51 -0700
Subject: [PATCH] Compress `let f; f=123` => `let f = 123;`

---
 src/js_parser.zig | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/js_parser.zig b/src/js_parser.zig
index 108f84c1b8..de09f08938 100644
--- a/src/js_parser.zig
+++ b/src/js_parser.zig
@@ -20195,6 +20195,33 @@ fn NewParser_(
                                     p.allocator,
                                 );
                                 continue;
+                            } else if
+                            //
+                            // Input:
+                            //      var f;
+                            //      f = 123;
+                            // Output:
+                            //      var f = 123;
+                            //
+                            // This doesn't handle every case. Only the very simple one.
+                            (prev_stmt.data == .s_local and
+                                s_expr.value.data == .e_binary and
+                                prev_stmt.data.s_local.decls.len == 1 and
+                                s_expr.value.data.e_binary.op == .bin_assign)
+                            {
+                                var prev_local = prev_stmt.data.s_local;
+                                var bin_assign = s_expr.value.data.e_binary;
+
+                                if (bin_assign.left.data == .e_identifier) {
+                                    var decl = &prev_local.decls.slice()[0];
+                                    if (decl.binding.data == .b_identifier and
+                                        decl.binding.data.b_identifier.ref.eql(bin_assign.left.data.e_identifier.ref) and
+                                        (decl.value == null or decl.value.?.isPrimitiveLiteral()))
+                                    {
+                                        decl.value = bin_assign.right;
+                                        p.ignoreUsage(bin_assign.left.data.e_identifier.ref);
+                                        continue;
+                                    }
                                 }
                             }
                         }