provide diagnostic details on --mangle-props

closes #5618
mishoo · Aug 17, 2022 · b79cf1f · b79cf1f
1 parent 8602d1b
commit b79cf1f
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diff --git a/lib/propmangle.js b/lib/propmangle.js
@@ -271,7 +271,10 @@ function mangle_properties(ast, options) {
     }
 
     function mangle(name) {
-        if (!should_mangle(name)) return name;
+        if (!should_mangle(name)) {
+            AST_Node.info("Preserving property {name}", { name: name });
+            return name;
+        }
         var mangled = cache.get(name);
         if (!mangled) {
             if (debug) {
@@ -286,6 +289,10 @@ function mangle_properties(ast, options) {
             if (/^#/.test(name)) mangled = "#" + mangled;
             cache.set(name, mangled);
         }
+        AST_Node.info("Mapping property {name} to {mangled}", {
+            mangled: mangled,
+            name: name,
+        });
         return mangled;
     }
 

diff --git a/test/compress/classes.js b/test/compress/classes.js
@@ -2200,6 +2200,14 @@ mangle_properties: {
         console.log(A.s, new A().e);
     }
     expect_stdout: "PASS 42"
+    expect_warnings: [
+        "INFO: Mapping property #P to #t",
+        "INFO: Mapping property Q to s",
+        "INFO: Mapping property #p to #i",
+        "INFO: Mapping property r to e",
+        "INFO: Preserving property q",
+        "INFO: Preserving property log",
+    ]
     node_version: ">=14.6"
 }