babel-plugin-minify-constant-folding - npm Package Compare versions

Comparing version 0.2.0 to 0.3.0-alpha.033d9ab6

lib/index.js

@@ -25,11 +25,12 @@ "use strict";
 function swap(path, member, handlers) {
-  var key = getName(member);
-  if (key === undefined) return;
-  var handler = handlers[key];
-  if (typeof handler !== "function" || !Object.hasOwnProperty.call(handlers, key)) {
-    if (typeof handlers[FALLBACK_HANDLER] === "function") {
-      handler = handlers[FALLBACK_HANDLER].bind(member.object, key);
-    } else {
-      return false;
-    }
+  var key = getName(member.node);
+  if (key === void 0) return false;
+
+  var handler = void 0;
+  if (hop(handlers, key) && typeof handlers[key] === "function") {
+    handler = handlers[key];
+  } else if (typeof handlers[FALLBACK_HANDLER] === "function") {
+    handler = handlers[FALLBACK_HANDLER].bind(member.get("object"), key);
+  } else {
+    return false;
   }
@@ -41,3 +42,3 @@
 
-  var replacement = handler.apply(member.object, args);
+  var replacement = handler.apply(member.get("object"), args);
   if (replacement) {
@@ -165,2 +166,11 @@ path.replaceWith(replacement);
 
+          // this will convert object to object but
+          // t.valueToNode has other effects where property name
+          // is not treated for the respective environment.
+          // So we bail here for objects and let other plugins
+          // take care of converting String literal to Identifier
+          if (typeof res.value === "object") {
+            return;
+          }
+
           var _node = t.valueToNode(res.value);
@@ -173,7 +183,11 @@ _node[seen] = true;
         var node = path.node;
-        var member = node.callee;
 
+        var member = path.get("callee");
         if (t.isMemberExpression(member)) {
-          var helpers = replacements[member.object.type];
+          var helpers = replacements[member.node.object.type];
           if (!helpers || !helpers.calls) return;
+          // find if the input can be constant folded
+          if (typeof helpers.canReplace === "function" && !helpers.canReplace.call(member.get("object"))) {
+            return;
+          }
           swap.apply(undefined, [path, member, helpers.calls].concat(_toConsumableArray(node.arguments)));
@@ -183,10 +197,14 @@ }
       MemberExpression(path) {
-        var member = path.node;
+        var node = path.node;
 
-        var helpers = replacements[member.object.type];
+        var helpers = replacements[node.object.type];
         if (!helpers || !helpers.members) return;
-        swap(path, member, helpers.members);
+        swap(path, path, helpers.members);
       }
     }
   };
-};
+};
+
+function hop(o, key) {
+  return Object.prototype.hasOwnProperty.call(o, key);
+}

lib/replacements.js

@@ -23,3 +23,3 @@ "use strict";
 
-        return cb.call.apply(cb, [this, this, i.value].concat(args));
+        return cb.call.apply(cb, [this.node, this.node, i.value].concat(args));
       }
@@ -29,21 +29,26 @@ };
 
+  function hasSpread(node) {
+    return node.elements.some(function (el) {
+      return t.isSpreadElement(el);
+    });
+  }
+
   return {
     ArrayExpression: {
+      canReplace() {
+        return !hasSpread(this.node);
+      },
       members: {
         length() {
-          if (this.elements.some(function (el) {
-            return t.isSpreadElement(el);
-          })) {
+          if (hasSpread(this.node)) {
             return;
           }
-          return t.numericLiteral(this.elements.length);
+          return t.numericLiteral(this.node.elements.length);
         },
         [FALLBACK_HANDLER](i) {
-          if (this.elements.some(function (el) {
-            return t.isSpreadElement(el);
-          })) {
+          if (hasSpread(this.node)) {
             return;
           }
           if (typeof i === "number" || i.match(/^\d+$/)) {
-            return this.elements[i] || undef;
+            return this.node.elements[i] || undef;
           }
@@ -58,19 +63,20 @@ }
           var bad = false;
-          var str = this.elements.map(function (el) {
-            if (!t.isLiteral(el)) {
+          var str = this.get("elements").map(function (el) {
+            var evaled = el.evaluate();
+            if (!evaled.confident) {
               bad = true;
               return;
             }
-            return el.value;
+            return evaled.value;
           }).join(sep.value);
-          return bad ? undefined : t.stringLiteral(str);
+          return bad ? void 0 : t.stringLiteral(str);
         },
         push() {
-          return t.numericLiteral(this.elements.length + arguments.length);
+          return t.numericLiteral(this.node.elements.length + arguments.length);
         },
         shift() {
-          if (this.elements.length === 0) {
+          if (this.node.elements.length === 0) {
             return undef;
           }
-          return t.numericLiteral(this.elements.length - 1);
+          return t.numericLiteral(this.node.elements.length - 1);
         },
@@ -84,12 +90,12 @@ slice() {
           }
-          return t.arrayExpression(this.elements.slice(start.value, end && end.value));
+          return t.arrayExpression(this.node.elements.slice(start.value, end && end.value));
         },
         pop() {
-          return this.elements[this.elements.length - 1] || undef;
+          return this.node.elements[this.node.elements.length - 1] || undef;
         },
         reverse() {
-          return t.arrayExpression(this.elements.reverse());
+          return t.arrayExpression(this.node.elements.reverse());
         },
         splice(start, end) {
-          var _elements$slice;
+          var _node$elements$slice;
 
@@ -107,3 +113,3 @@ if (!t.isNumericLiteral(start) || end && !t.isNumericLiteral(end)) {
           }
-          return t.arrayExpression((_elements$slice = this.elements.slice()).splice.apply(_elements$slice, [start.value].concat(args)));
+          return t.arrayExpression((_node$elements$slice = this.node.elements.slice()).splice.apply(_node$elements$slice, [start.value].concat(args)));
         }
@@ -115,7 +121,7 @@ }
         length() {
-          return t.numericLiteral(this.value.length);
+          return t.numericLiteral(this.node.value.length);
         },
         [FALLBACK_HANDLER](i) {
           if (typeof i === "number" || i.match(/^\d+$/)) {
-            var ch = this.value[i];
+            var ch = this.node.value[i];
             return ch ? t.stringLiteral(ch) : undef;
@@ -137,3 +143,3 @@ }
           if (realSep !== null) {
-            return t.arrayExpression(this.value.split(realSep).map(function (str) {
+            return t.arrayExpression(this.node.value.split(realSep).map(function (str) {
               return t.stringLiteral(str);
@@ -140,0 +146,0 @@ }));

package.json

 {
   "name": "babel-plugin-minify-constant-folding",
-  "version": "0.2.0",
+  "version": "0.3.0-alpha.033d9ab6",
   "description": "",
@@ -15,4 +15,4 @@ "keywords": [
   "dependencies": {
-    "babel-helper-evaluate-path": "^0.2.0"
+    "babel-helper-evaluate-path": "^0.3.0-alpha.033d9ab6"
   }
 }

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Improved metrics

Total package byte prevSize

12935

increased by7.27%

Lines of code

314

increased by6.8%

Worsened metrics

Number of package files

4

decreased by-20%

Dependency changes

• + Addedbabel-helper-evaluate-path@0.3.0(transitive)

• - Removedbabel-helper-evaluate-path@0.2.0(transitive)

• Updatedbabel-helper-evaluate-path@^0.3.0-alpha.033d9ab6