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fix corner cases in optional_chains (#5110)

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This commit is contained in:
Alex Lam S.L
2021-08-20 03:10:10 +01:00
committed by GitHub
parent befb99bd71
commit 9634a9d1fd
8 changed files with 228 additions and 93 deletions
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27
lib/compress.js
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@@ -1721,11 +1721,6 @@ merge(Compressor.prototype, {
return x;
}
function root_expr(prop) {
while (prop instanceof AST_PropAccess) prop = prop.expression;
return prop;
}
function is_iife_call(node) {
if (node.TYPE != "Call") return false;
do {
@@ -9070,16 +9065,20 @@ merge(Compressor.prototype, {
OPT(AST_Const, varify);
OPT(AST_Let, varify);
function trim_optional_chain(self, compressor) {
function trim_optional_chain(node, compressor) {
if (!compressor.option("optional_chains")) return;
if (!self.optional) return;
var expr = self.expression;
var ev = fuzzy_eval(compressor, expr, true);
if (ev == null) return make_node(AST_UnaryPrefix, self, {
operator: "void",
expression: expr,
}).optimize(compressor);
if (!(ev instanceof AST_Node)) self.optional = false;
if (node.terminal) do {
var expr = node.expression;
if (node.optional) {
var ev = fuzzy_eval(compressor, expr, true);
if (ev == null) return make_node(AST_UnaryPrefix, node, {
operator: "void",
expression: expr,
}).optimize(compressor);
if (!(ev instanceof AST_Node)) node.optional = false;
}
node = expr;
} while ((node.TYPE == "Call" || node instanceof AST_PropAccess) && !node.terminal);
}
function lift_sequence_in_expression(node, compressor) {