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enhance inline, sequences & side_effects (#4493)

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This commit is contained in:
Alex Lam S.L
2021-01-02 01:43:05 +00:00
committed by GitHub
parent dfb86ccdd1
commit cc2d7acaf0
2 changed files with 190 additions and 1 deletions
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15
lib/compress.js
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@@ -8018,7 +8018,7 @@ merge(Compressor.prototype, {
}
}
var fn = exp instanceof AST_SymbolRef ? exp.fixed_value() : exp;
var is_func = fn instanceof AST_Arrow || fn instanceof AST_Defun || fn instanceof AST_Function;
var is_func = fn instanceof AST_Lambda && (!is_async(fn) || compressor.parent() instanceof AST_Await);
var stat = is_func && fn.first_statement();
var has_default = false;
var can_drop = is_func && all(fn.argnames, function(argname, index) {
@@ -8649,6 +8649,19 @@ merge(Compressor.prototype, {
? self : try_evaluate(compressor, self);
});
OPT(AST_Await, function(self, compressor) {
if (compressor.option("sequences")) {
var seq = lift_sequence_in_expression(self, compressor);
if (seq !== self) return seq.optimize(compressor);
}
if (compressor.option("side_effects")) {
var exp = self.expression;
if (exp instanceof AST_Await) return exp;
if (exp instanceof AST_UnaryPrefix && exp.expression instanceof AST_Await) return exp;
}
return self;
});
AST_Binary.DEFMETHOD("lift_sequences", function(compressor) {
if (this.left instanceof AST_PropAccess) {
if (!(this.left.expression instanceof AST_Sequence)) return this;