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Compress let f; f=123 => let f = 123;

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This commit is contained in:
Jarred Sumner
2023-05-01 21:00:51 -07:00
parent b3c7d0ea23
commit c5df4e9477
1 changed files with 27 additions and 0 deletions
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27
src/js_parser.zig
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@@ -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;
}
}
}
}