diff options
| -rw-r--r-- | lib/scope.js | 12 | ||||
| -rw-r--r-- | test/compress/dead-code.js | 46 |
2 files changed, 57 insertions, 1 deletions
diff --git a/lib/scope.js b/lib/scope.js index 5e93020f..22fb150d 100644 --- a/lib/scope.js +++ b/lib/scope.js @@ -154,7 +154,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){ else if (node instanceof AST_SymbolVar || node instanceof AST_SymbolConst) { var def = defun.def_variable(node); - def.constant = node instanceof AST_SymbolConst; + def.constant = node instanceof AST_SymbolConst || node.has_const_pragma(); def.init = tw.parent().value; } else if (node instanceof AST_SymbolCatch) { @@ -357,6 +357,16 @@ AST_Symbol.DEFMETHOD("global", function(){ return this.definition().global; }); +AST_Symbol.DEFMETHOD("has_const_pragma", function() { + var token = this.scope.body[0] && this.scope.body[0].start; + var comments = token && token.comments_before; + if (comments && comments.length > 0) { + var last = comments[comments.length - 1]; + return /@const/.test(last.value); + } + return false; +}) + AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){ return defaults(options, { except : [], diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js index 5009ae1e..f79b04de 100644 --- a/test/compress/dead-code.js +++ b/test/compress/dead-code.js @@ -87,3 +87,49 @@ dead_code_constant_boolean_should_warn_more: { var moo;
}
}
+
+dead_code_const_declaration: {
+ options = {
+ dead_code : true,
+ loops : true,
+ booleans : true,
+ conditionals : true,
+ evaluate : true
+ };
+ input: {
+ const CONST_FOO = false;
+ if (CONST_FOO) {
+ console.log("unreachable");
+ var moo;
+ function bar() {}
+ }
+ }
+ expect: {
+ const CONST_FOO = !1;
+ var moo;
+ function bar() {}
+ }
+}
+
+dead_code_const_annotation: {
+ options = {
+ dead_code : true,
+ loops : true,
+ booleans : true,
+ conditionals : true,
+ evaluate : true
+ };
+ input: {
+ /** @const*/ var CONST_FOO_ANN = false;
+ if (CONST_FOO_ANN) {
+ console.log("unreachable");
+ var moo;
+ function bar() {}
+ }
+ }
+ expect: {
+ var CONST_FOO_ANN = !1;
+ var moo;
+ function bar() {}
+ }
+}
|