match .d.ts definition

Author: saihaj

src/execution/execute.ts

@@ -112,17 +112,25 @@ export type ExecutionContext = {
  *   - `data` is the result of a successful execution of the query.
  *   - `extensions` is reserved for adding non-standard properties.
  */
-export type ExecutionResult = {
+export interface ExecutionResult<
+  TData = { [key: string]: any },
+  TExtensions = { [key: string]: any },
+> {
   errors?: ReadonlyArray<GraphQLError>;
-  data?: ObjMap<unknown> | null;
-  extensions?: ObjMap<unknown>;
-};
+  // TS_SPECIFIC: TData. Motivation: https://github.com/graphql/graphql-js/pull/2490#issuecomment-639154229
+  data?: TData | null;
+  extensions?: TExtensions;
+}
 
-export type FormattedExecutionResult = {
+export interface FormattedExecutionResult<
+  TData = { [key: string]: any },
+  TExtensions = { [key: string]: any },
+> {
   errors?: ReadonlyArray<GraphQLFormattedError>;
-  data?: ObjMap<unknown> | null;
-  extensions?: ObjMap<unknown>;
-};
+  // TS_SPECIFIC: TData. Motivation: https://github.com/graphql/graphql-js/pull/2490#issuecomment-639154229
+  data?: TData | null;
+  extensions?: TExtensions;
+}
 
 export type ExecutionArgs = {
   schema: GraphQLSchema;