fix(module syntax): added interop with cjs syntax

Author: yashmahalwal

.npmignore

@@ -0,0 +1 @@
+index.ts

index.d.ts

@@ -1,6 +1,5 @@
 declare type NodeId = string;
 declare type EdgeWeight = number;
-declare type EncodedEdge = string;
 interface Serialized {
     nodes: {
         id: NodeId;
@@ -31,4 +30,4 @@ declare function Graph(serialized?: Serialized): {
     serialize: () => Serialized;
     deserialize: (serialized: Serialized) => any;
 };
-//# sourceMappingURL=index.d.ts.map
+export = Graph;

index.d.ts.map

@@ -396,4 +396,4 @@ function Graph(serialized?: Serialized) {
     // The returned graph instance.
     return graph;
 }
-module.exports =  Graph;
+export = Graph;

index.ts

@@ -3,7 +3,6 @@
         "allowJs": false,
         "declaration": true,
         "esModuleInterop": true,
-        "declarationMap": true,
         "module": "CommonJS",
         "noImplicitAny": true,
         "noImplicitReturns": true,
@@ -12,7 +11,8 @@
         "target": "ES5",
         "strictFunctionTypes": true,
         "strictNullChecks": true,
-        "downlevelIteration": true
+        "downlevelIteration": true,
+        "isolatedModules": true
     },
     "file": ["index.ts"],
     "exclude": ["node_modules", "*.d.ts"]