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fix corner cases in rests & unused (#5063)

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This commit is contained in:
Alex Lam S.L
2021-07-09 17:28:23 +01:00
committed by GitHub
parent ea7829daf5
commit 450aabaaa0
2 changed files with 88 additions and 8 deletions
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18
lib/compress.js
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@@ -5507,7 +5507,7 @@ merge(Compressor.prototype, {
if (!(fn.rest instanceof AST_DestructuredArray)) return;
if (!compressor.drop_fargs(fn, compressor.parent())) return;
fn.argnames = fn.argnames.concat(fn.rest.elements);
fn.rest = null;
fn.rest = fn.rest.rest;
}
OPT(AST_Lambda, function(self, compressor) {
@@ -6428,12 +6428,16 @@ merge(Compressor.prototype, {
}
if (!(node instanceof AST_Accessor)) {
if (node.rest) {
node.rest = node.rest.transform(trimmer);
if (!(node.uses_arguments && !tt.has_directive("use strict"))
&& (node.rest instanceof AST_DestructuredArray && node.rest.elements.length == 0
|| node.rest instanceof AST_DestructuredObject && node.rest.properties.length == 0)) {
node.rest = null;
var rest = node.rest.transform(trimmer);
if (rest instanceof AST_Destructured && !rest.rest
&& (!node.uses_arguments || tt.has_directive("use strict"))) {
if (rest instanceof AST_DestructuredArray) {
if (rest.elements.length == 0) rest = null;
} else if (rest.properties.length == 0) {
rest = null;
}
}
node.rest = rest;
}
var argnames = node.argnames;
var trim = compressor.drop_fargs(node, parent) && !node.rest;
@@ -12125,7 +12129,7 @@ merge(Compressor.prototype, {
OPT(AST_DestructuredArray, function(self, compressor) {
if (compressor.option("rests") && self.rest instanceof AST_DestructuredArray) {
self.elements = self.elements.concat(self.rest.elements);
self.rest = null;
self.rest = self.rest.rest;
}
return self;
});