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fix corner case in ie8 (#4187)

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fixes #4186
This commit is contained in:
Alex Lam S.L
2020-10-06 02:20:41 +01:00
committed by GitHub
parent b91a2459c0
commit bc6e105174
5 changed files with 129 additions and 37 deletions
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23
lib/compress.js
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@@ -1018,6 +1018,13 @@ merge(Compressor.prototype, {
return sym instanceof AST_SymbolLambda && def.scope.name === sym;
});
function find_scope(compressor) {
var level = 0, node;
while (node = compressor.parent(level++)) {
if (node.variables) return node;
}
}
function is_lhs_read_only(lhs, compressor) {
if (lhs instanceof AST_This) return true;
if (lhs instanceof AST_SymbolRef) {
@@ -6885,7 +6892,7 @@ merge(Compressor.prototype, {
&& !fn.pinned()
&& !(fn.name && fn instanceof AST_Function)
&& (exp === fn || !recursive_ref(compressor, def = exp.definition())
&& fn.is_constant_expression(compressor.find_parent(AST_BlockScope)))
&& fn.is_constant_expression(find_scope(compressor)))
&& (value = can_flatten_body(stat))
&& !fn.contains_this()) {
var replacing = exp === fn || compressor.option("unused") && def.references.length - def.replaced == 1;
@@ -8303,9 +8310,16 @@ merge(Compressor.prototype, {
return lhs instanceof AST_SymbolRef || lhs.TYPE === self.TYPE;
}
function find_variable(compressor, name) {
var level = 0, node;
while (node = compressor.parent(level++)) {
if (node.variables) return node.find_variable(name);
}
}
OPT(AST_Undefined, function(self, compressor) {
if (compressor.option("unsafe_undefined")) {
var undef = compressor.find_parent(AST_BlockScope).find_variable("undefined");
var undef = find_scope(compressor).find_variable("undefined");
if (undef) {
var ref = make_node(AST_SymbolRef, self, {
name : "undefined",
@@ -8331,7 +8345,7 @@ merge(Compressor.prototype, {
if (lhs && is_atomic(lhs, self)) return self;
if (compressor.option("keep_infinity")
&& !(lhs && !is_atomic(lhs, self))
&& !compressor.find_parent(AST_BlockScope).find_variable("Infinity"))
&& !find_scope(compressor).find_variable("Infinity"))
return self;
return make_node(AST_Binary, self, {
operator: "/",
@@ -8346,8 +8360,7 @@ merge(Compressor.prototype, {
OPT(AST_NaN, function(self, compressor) {
var lhs = is_lhs(compressor.self(), compressor.parent());
if (lhs && !is_atomic(lhs, self)
|| compressor.find_parent(AST_BlockScope).find_variable("NaN")) {
if (lhs && !is_atomic(lhs, self) || find_scope(compressor).find_variable("NaN")) {
return make_node(AST_Binary, self, {
operator: "/",
left: make_node(AST_Number, self, {