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enhance if_return & side_effects (#4494)

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This commit is contained in:
Alex Lam S.L
2021-01-02 04:39:51 +00:00
committed by GitHub
parent cc2d7acaf0
commit b3a706114c
2 changed files with 30 additions and 11 deletions
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19
lib/compress.js
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@@ -2600,10 +2600,18 @@ merge(Compressor.prototype, {
statements.splice(i, 1);
continue;
}
if (stat.value instanceof AST_UnaryPrefix && stat.value.operator == "void") {
var tail = stat.value.tail_node();
if (tail instanceof AST_UnaryPrefix && tail.operator == "void") {
CHANGED = true;
var body;
if (tail === stat.value) {
body = tail.expression;
} else {
body = stat.value.clone();
body.expressions[body.length - 1] = tail.expression;
}
statements[i] = make_node(AST_SimpleStatement, stat, {
body: stat.value.expression
body: body,
});
continue;
}
@@ -6642,6 +6650,13 @@ merge(Compressor.prototype, {
return this;
});
def(AST_AsyncFunction, return_null);
def(AST_Await, function(compressor) {
var exp = this.expression.drop_side_effect_free(compressor);
if (exp === this.expression) return this;
var node = this.clone();
node.expression = exp || make_node(AST_Number, this, { value: 0 });
return node;
});
def(AST_Binary, function(compressor, first_in_statement) {
if (this.operator == "in" && !is_object(this.right)) {
var left = this.left.drop_side_effect_free(compressor, first_in_statement);