Fix JSON Serialization for source

Author: lifeiscontent

src/language/ast.d.ts

@@ -33,7 +33,7 @@ export class Location {
 
   constructor(startToken: Token, endToken: Token, source: Source);
 
-  toJSON(): { start: number; end: number };
+  toJSON(): { start: number; end: number, source: Source };
 }
 
 /**

src/language/ast.js

@@ -41,8 +41,8 @@ export class Location {
     this.source = source;
   }
 
-  toJSON(): {| start: number, end: number |} {
-    return { start: this.start, end: this.end };
+  toJSON(): {| start: number, end: number, source: Source |} {
+    return { start: this.start, end: this.end, source: this.source };
   }
 }
 

src/language/source.js

@@ -48,6 +48,10 @@ export class Source {
   get [SYMBOL_TO_STRING_TAG]() {
     return 'Source';
   }
+
+  toJSON(): {| body: string, name: string, locationOffset: Location |} {
+    return { body: this.body, name: this.name, locationOffset: this.locationOffset };
+  }
 }
 
 /**