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improve if_return (#2558)

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`return void x()` => `x()`
This commit is contained in:
Alex Lam S.L
2017-12-07 01:01:52 +08:00
committed by GitHub
parent b9f3ddfb30
commit 3dd495ecdd
2 changed files with 45 additions and 7 deletions
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30
lib/compress.js
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@@ -1211,10 +1211,19 @@ merge(Compressor.prototype, {
var stat = statements[i];
var next = statements[i + 1];
if (in_lambda && stat instanceof AST_Return && !stat.value && !next) {
CHANGED = true;
statements.length--;
continue;
if (in_lambda && !next && stat instanceof AST_Return) {
if (!stat.value) {
CHANGED = true;
statements.length--;
continue;
}
if (stat.value instanceof AST_UnaryPrefix && stat.value.operator == "void") {
CHANGED = true;
statements[i] = make_node(AST_SimpleStatement, stat, {
body: stat.value.expression
});
continue;
}
}
if (stat instanceof AST_If) {
@@ -1301,9 +1310,16 @@ merge(Compressor.prototype, {
&& prev instanceof AST_If && prev.body instanceof AST_Return
&& i + 2 == statements.length && next instanceof AST_SimpleStatement) {
CHANGED = true;
statements.push(make_node(AST_Return, next, {
value: null
}).transform(compressor));
stat = stat.clone();
stat.alternative = make_node(AST_BlockStatement, next, {
body: [
next,
make_node(AST_Return, next, {
value: null
})
]
});
statements.splice(i, 2, stat.transform(compressor));
continue;
}
}