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scan assignment value in drop_unused() (#1578)

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those were not optimised for `unused` before, which made it necessary for `reduce_vars` to have separate steps for `keep_fnames`

docs update by @kzc

closes #1577
This commit is contained in:
Alex Lam S.L
2017-03-08 18:37:32 +08:00
committed by GitHub
parent 344d11d591
commit 711f88dcb4
3 changed files with 30 additions and 8 deletions
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5
lib/compress.js
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@@ -1840,6 +1840,7 @@ merge(Compressor.prototype, {
}
if (drop_vars && node instanceof AST_Definitions && !(tt.parent() instanceof AST_ForIn)) {
var def = node.definitions.filter(function(def){
if (def.value) def.value = def.value.transform(tt);
if (def.name.definition().id in in_use_ids) return true;
var w = {
name : def.name.name,
@@ -2611,10 +2612,6 @@ merge(Compressor.prototype, {
if (compressor.option("unused")
&& def.references.length == 1
&& compressor.find_parent(AST_Scope) === def.scope) {
if (!compressor.option("keep_fnames")
&& exp.name && exp.name.definition() === def) {
exp.name = null;
}
self.expression = exp;
}
}