Allow super in class properties (#499)

src/parser/expression.js

@@ -381,7 +381,11 @@ export default class ExpressionParser extends LValParser {
 
     switch (this.state.type) {
       case tt._super:
-        if (!this.state.inMethod && !this.options.allowSuperOutsideMethod) {
+        if (
+          !this.state.inMethod &&
+          !this.state.inClassProperty &&
+          !this.options.allowSuperOutsideMethod
+        ) {
           this.raise(this.state.start, "'super' outside of function or class");
         }
 

src/parser/statement.js

@@ -772,19 +772,23 @@ export default class StatementParser extends ExpressionParser {
   }
 
   parseClassProperty(node) {
+    const hasPlugin = this.hasPlugin("classProperties");
     const noPluginMsg = "You can only use Class Properties when the 'classProperties' plugin is enabled.";
-    if (!node.typeAnnotation && !this.hasPlugin("classProperties")) {
+    if (!node.typeAnnotation && !hasPlugin) {
       this.raise(node.start, noPluginMsg);
     }
 
+    this.state.inClassProperty = true;
+
     if (this.match(tt.eq)) {
-      if (!this.hasPlugin("classProperties")) this.raise(this.state.start, noPluginMsg);
+      if (!hasPlugin) this.raise(this.state.start, noPluginMsg);
       this.next();
       node.value = this.parseMaybeAssign();
     } else {
       node.value = null;
     }
     this.semicolon();
+    this.state.inClassProperty = false;
     return this.finishNode(node, "ClassProperty");
   }
 

src/tokenizer/state.js

@@ -18,6 +18,7 @@ export default class State {
       this.inAsync =
       this.inPropertyName =
       this.inType =
+      this.inClassProperty =
       this.noAnonFunctionType =
         false;
 
@@ -73,6 +74,7 @@ export default class State {
   inAsync: boolean;
   inType: boolean;
   inPropertyName: boolean;
+  inClassProperty: boolean;
 
   // Labels in scope.
   labels: Array<Object>;