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implement directives (#3203)

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fixes #3166
This commit is contained in:
Alex Lam S.L
2018-06-28 18:16:49 +08:00
committed by GitHub
parent 957d5537a8
commit 76df77c08c
9 changed files with 238 additions and 209 deletions
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5
lib/compress.js
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@@ -54,6 +54,7 @@ function Compressor(options, false_by_default) {
comparisons : !false_by_default,
conditionals : !false_by_default,
dead_code : !false_by_default,
directives : !false_by_default,
drop_console : false,
drop_debugger : !false_by_default,
evaluate : !false_by_default,
@@ -3264,8 +3265,10 @@ merge(Compressor.prototype, {
/* -----[ optimizers ]----- */
var directives = makePredicate(["use asm", "use strict"]);
OPT(AST_Directive, function(self, compressor) {
if (compressor.has_directive(self.value) !== self) {
if (compressor.option("directives")
&& (!directives[self.value] || compressor.has_directive(self.value) !== self)) {
return make_node(AST_EmptyStatement, self);
}
return self;