improve usability of pure_funcs (#3336)

fixes #3325
2019-03-14 21:36:45 +08:00
parent ebd82b3fb6
commit e49297e5eb
2 changed files with 47 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -106,10 +106,16 @@ function Compressor(options, false_by_default) {
    var pure_funcs = this.options["pure_funcs"];
    if (typeof pure_funcs == "function") {
        this.pure_funcs = pure_funcs;
-    } else {
-        this.pure_funcs = pure_funcs ? function(node) {
+    } else if (typeof pure_funcs == "string") {
+        this.pure_funcs = function(node) {
+            return pure_funcs !== node.expression.print_to_string();
+        };
+    } else if (Array.isArray(pure_funcs)) {
+        this.pure_funcs = function(node) {
            return pure_funcs.indexOf(node.expression.print_to_string()) < 0;
-        } : return_true;
+        };
+    } else {
+        this.pure_funcs = return_true;
    }
    var top_retain = this.options["top_retain"];
    if (top_retain instanceof RegExp) {