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enhance unused (#4858)

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This commit is contained in:
Alex Lam S.L
2021-04-22 03:58:50 +01:00
committed by GitHub
parent 3c161a6662
commit bddb5a0102
4 changed files with 61 additions and 9 deletions
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29
lib/compress.js
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@@ -5817,19 +5817,29 @@ merge(Compressor.prototype, {
} else if (node instanceof AST_Unary) {
if (node.write_only) sym = node.expression;
}
if (/strict/.test(compressor.option("pure_getters"))) {
while (sym instanceof AST_PropAccess && !sym.expression.may_throw_on_access(compressor)) {
if (sym instanceof AST_Sub) props.unshift(sym.property);
sym = sym.expression;
nested = true;
}
}
if (/strict/.test(compressor.option("pure_getters"))) sym = extract_reference(sym, props);
if (!(sym instanceof AST_SymbolRef)) return;
var def = sym.definition();
if (export_defaults[def.id]) return;
if (compressor.exposed(def)) return;
if (!can_drop_symbol(sym, compressor, nested)) return;
return sym;
function extract_reference(node, props) {
if (node instanceof AST_PropAccess) {
var expr = node.expression;
if (!expr.may_throw_on_access(compressor)) {
nested = true;
if (props && node instanceof AST_Sub) props.unshift(node.property);
return extract_reference(expr, props);
}
} else if (node instanceof AST_Assign && node.operator == "=") {
var ref = extract_reference(node.right);
if (props) props.assign = node;
return ref;
}
return node;
}
};
var assign_in_use = Object.create(null);
var export_defaults = Object.create(null);
@@ -6648,6 +6658,11 @@ merge(Compressor.prototype, {
}
}, true);
}))) {
if (props.assign) {
props.assign.write_only = true;
props.assign.walk(tw);
delete props.assign.write_only;
}
props.forEach(function(prop) {
prop.walk(tw);
});