Merge pull request #14 from mad-gooze/fix-reference-ctor-params

fix referencing constructor params in constructor body (fixes #13)

src/properties-minifier.ts

@@ -48,6 +48,8 @@ export class PropertiesMinifier {
 			return this.createNewAccessExpression(node, program);
 		} else if (ts.isBindingElement(node)) {
 			return this.createNewBindingElement(node, program);
+		} else if (isConstructorParameterReference(node, program)) {
+			return this.createNewNode(program, node, ts.createIdentifier);
 		} else if (isConstructorParameter(node) && isPrivateNonStatic(node)) {
 			return this.createNewConstructorParameter(node, program);
 		}
@@ -251,6 +253,16 @@ function getClassName(classNode: ts.ClassLikeDeclaration): string {
 	return classNode.name.getText();
 }
 
+function isConstructorParameterReference(node: ts.Node, program: ts.Program): node is ts.Identifier {
+	if (!ts.isIdentifier(node)) {
+		return false;
+	}
+
+	const typeChecker = program.getTypeChecker();
+	const symbol = typeChecker.getSymbolAtLocation(node);
+	return isPrivateNonStaticClassMember(symbol);
+}
+
 function isPrivateNonStaticClassMember(symbol: ts.Symbol | undefined): boolean {
 	// for some reason ts.Symbol.declarations can be undefined (for example in order to accessing to proto member)
 	if (symbol === undefined || symbol.declarations === undefined) { // tslint:disable-line:strict-type-predicates