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fix corner cases with class (#4723)

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fixes #4720
fixes #4721
fixes #4722
This commit is contained in:
Alex Lam S.L
2021-03-02 19:32:58 +00:00
committed by GitHub
parent adcafce048
commit 955411e065
3 changed files with 148 additions and 8 deletions
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30
lib/compress.js
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@@ -409,6 +409,10 @@ merge(Compressor.prototype, {
return node instanceof AST_Class || node instanceof AST_Lambda;
}
function safe_for_extends(node) {
return node instanceof AST_Class || node instanceof AST_Defun || node instanceof AST_Function;
}
function is_arguments(def) {
return def.name == "arguments" && def.scope.uses_arguments;
}
@@ -4815,7 +4819,7 @@ merge(Compressor.prototype, {
var base = this.extends;
if (base) {
if (base instanceof AST_SymbolRef) base = base.fixed_value();
if (!is_lambda(base) || is_arrow(base)) return true;
if (!safe_for_extends(base)) return true;
}
return any(this.properties, compressor);
});
@@ -5037,7 +5041,7 @@ merge(Compressor.prototype, {
});
def(AST_Class, function(scope) {
var base = this.extends;
if (base && (!is_lambda(base) || is_arrow(base))) return false;
if (base && !safe_for_extends(base)) return false;
return all_constant(this.properties, scope);
});
def(AST_ClassProperty, function(scope) {
@@ -7310,7 +7314,7 @@ merge(Compressor.prototype, {
var base = this.extends;
if (base) {
if (base instanceof AST_SymbolRef) base = base.fixed_value();
base = !is_lambda(base) || is_arrow(base);
base = !safe_for_extends(base);
if (!base) exprs.unshift(this.extends);
}
exprs = trim(exprs, compressor, first_in_statement);
@@ -7320,10 +7324,6 @@ merge(Compressor.prototype, {
if (!base && !values) return null;
exprs = [];
}
if (base) exprs.unshift(make_node(AST_ClassExpression, this, {
extends: this.extends,
properties: [],
}));
if (values) {
var fn = make_node(AST_Arrow, this, {
argnames: [],
@@ -7336,7 +7336,19 @@ merge(Compressor.prototype, {
expression: fn,
}));
}
return make_sequence(this, exprs);
exprs = exprs.length ? make_sequence(this, exprs) : null;
if (!base) return exprs;
var node = make_node(AST_ClassExpression, this, this);
node.name = null;
node.properties = [];
if (exprs) node.properties.push(make_node(AST_ClassMethod, this, {
key: exprs,
value: make_node(AST_Function, this, {
argnames: [],
body: [],
}).init_vars(node),
}));
return node;
});
def(AST_Conditional, function(compressor) {
var consequent = this.consequent.drop_side_effect_free(compressor);
@@ -10267,6 +10279,8 @@ merge(Compressor.prototype, {
single_use = false;
} else if (fixed.has_side_effects(compressor)) {
single_use = false;
} else if (compressor.option("ie8") && fixed instanceof AST_Class) {
single_use = false;
}
if (single_use) fixed.parent_scope = self.scope;
} else if (!fixed || !fixed.is_constant_expression() || fixed.drop_side_effect_free(compressor)) {