Basic TypeScript 3.0 support

Author: rpetrich

package.json

@@ -48,7 +48,7 @@
   "dependencies": {
     "glob": "~7.1.2",
     "json-stable-stringify": "^1.0.1",
-    "typescript": "~2.9.2",
+    "typescript": "^3.0.0",
     "yargs": "^11.0.0"
   },
   "devDependencies": {

typescript-json-schema.ts

@@ -882,7 +882,7 @@ export class JsonSchemaGenerator {
         if (!asRef || !this.reffedDefinitions[fullTypeName]) {
             if (asRef) { // must be here to prevent recursivity problems
                 let reffedDefinition: Definition;
-                if (asTypeAliasRef && reffedType!.getFlags() & (ts.TypeFlags.IndexedAccess | ts.TypeFlags.Index) && symbol) {
+                if (asTypeAliasRef && reffedType!.getFlags() & (ts.TypeFlags.IndexedAccess | ts.TypeFlags.Index | ts.TypeFlags.Intersection) && symbol) {
                     reffedDefinition = this.getTypeDefinition(typ, true, undefined, symbol, symbol);
                 } else {
                     reffedDefinition = definition;