enhance `unsafe` `evaluate` (#3564)

1 files changed, 8 insertions, 4 deletions

diff --git a/lib/compress.js b/lib/compress.js
index e3532fef..d8ee2bd3 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2995,6 +2995,7 @@ merge(Compressor.prototype, {
             ],
         };
         convert_to_predicate(static_values);
+        var regexp_props = makePredicate("global ignoreCase multiline source");
         def(AST_PropAccess, function(compressor, cached, depth) {
             if (compressor.option("unsafe")) {
                 var key = this.property;
@@ -3010,9 +3011,12 @@ merge(Compressor.prototype, {
                     val = global_objs[exp.name];
                 } else {
                     val = exp._eval(compressor, cached, depth + 1);
-                    if (!val || val === exp) return this;
-                    if (typeof val == "object" && !HOP(val, key)) return this;
-                    if (typeof val == "function") switch (key) {
+                    if (val == null || val === exp) return this;
+                    if (val instanceof RegExp) {
+                        if (!regexp_props[key]) return this;
+                    } else if (typeof val == "object") {
+                        if (!HOP(val, key)) return this;
+                    } else if (typeof val == "function") switch (key) {
                       case "name":
                         return val.node.name ? val.node.name.name : "";
                       case "length":
@@ -3060,7 +3064,7 @@ merge(Compressor.prototype, {
                     val = global_objs[e.name];
                 } else {
                     val = e._eval(compressor, cached, depth + 1);
-                    if (val === e || !val) return this;
+                    if (val == null || val === e) return this;
                     var native_fn = native_fns[val.constructor.name];
                     if (!native_fn || !native_fn[key]) return this;
                 }