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fix corner case in unused & yields (#5077)

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fixes #5076
This commit is contained in:
Alex Lam S.L
2021-07-12 16:16:12 +01:00
committed by GitHub
parent 0d350b78bf
commit 92c3fddd7a
2 changed files with 46 additions and 10 deletions
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27
lib/compress.js
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@@ -7179,16 +7179,15 @@ merge(Compressor.prototype, {
}
trimmed = prop.value.transform(trimmer);
if (!trimmed) {
if (node.rest || prop.key instanceof AST_Node) trimmed = retain_lhs(prop.value);
if (node.rest || retain_key(prop)) trimmed = retain_lhs(prop.value);
if (drop_keys && !(key in drop_keys)) {
if (mapped) {
drop_keys[key] = mapped;
if (value === null) {
prop_map[key] = mapped.key instanceof AST_Node
&& make_node(AST_ObjectKeyVal, mapped, {
key: mapped.key,
value: make_node(AST_Number, mapped, { value: 0 }),
});
prop_map[key] = retain_key(mapped) && make_node(AST_ObjectKeyVal, mapped, {
key: mapped.key,
value: make_node(AST_Number, mapped, { value: 0 }),
});
}
} else {
drop_keys[key] = true;
@@ -7222,7 +7221,7 @@ merge(Compressor.prototype, {
prop.value = trimmed;
return prop;
}
return prop.key instanceof AST_Node ? make_node(AST_ObjectKeyVal, prop, {
return retain_key(prop) ? make_node(AST_ObjectKeyVal, prop, {
key: prop.key,
value: make_node(AST_Number, prop, { value: 0 }),
}) : List.skip;
@@ -7259,6 +7258,10 @@ merge(Compressor.prototype, {
value: value,
};
function retain_key(prop) {
return prop.key instanceof AST_Node && prop.key.has_side_effects(compressor);
}
function retain_lhs(node) {
if (node instanceof AST_Destructured) {
if (value === null) {
@@ -9604,12 +9607,16 @@ merge(Compressor.prototype, {
var key = prop.key;
var value = prop.value.transform(tt);
if (value) {
side_effects.push(key instanceof AST_Node ? key : make_node_from_constant(key, prop));
if (side_effects.length) {
if (!(key instanceof AST_Node)) key = make_node_from_constant(key, prop);
side_effects.push(key);
key = make_sequence(node, side_effects);
side_effects = [];
}
properties.push(make_node(AST_DestructuredKeyVal, prop, {
key: make_sequence(node, side_effects),
key: key,
value: value,
}));
side_effects = [];
} else if (key instanceof AST_Node) {
side_effects.push(key);
}

29
test/compress/yields.js
View File

@@ -1246,3 +1246,32 @@ issue_5034: {
expect_stdout: "PASS"
node_version: ">=4"
}
issue_5076: {
options = {
evaluate: true,
hoist_vars: true,
passes: 2,
pure_getters: "strict",
side_effects: true,
toplevel: true,
unused: true,
yields: true,
}
input: {
var a;
console.log("PASS");
var b = function*({
p: {},
}) {}({
p: { a } = 42,
});
}
expect: {
var a;
console.log("PASS");
a = 42["a"];
}
expect_stdout: "PASS"
node_version: ">=6"
}