Use invariant instead of throw

Author: IvanGoncharov

src/utilities/buildASTSchema.js

@@ -7,6 +7,7 @@
  * @flow strict
  */
 
+import invariant from '../jsutils/invariant';
 import keyMap from '../jsutils/keyMap';
 import keyValMap from '../jsutils/keyValMap';
 import type { ObjMap } from '../jsutils/ObjMap';
@@ -116,9 +117,7 @@ export function buildASTSchema(
   ast: DocumentNode,
   options?: BuildSchemaOptions,
 ): GraphQLSchema {
-  if (!ast || ast.kind !== Kind.DOCUMENT) {
-    throw new Error('Must provide a document ast.');
-  }
+  invariant(ast && ast.kind === Kind.DOCUMENT, 'Must provide a document ast.');
 
   if (!options || !(options.assumeValid || options.assumeValidSDL)) {
     assertValidSDL(ast);
@@ -342,7 +341,7 @@ export class ASTDefinitionBuilder {
       case Kind.INPUT_OBJECT_TYPE_DEFINITION:
         return this._makeInputObjectDef(def);
       default:
-        throw new Error(`Type kind "${def.kind}" not supported.`);
+        invariant(false, `Type kind "${def.kind}" not supported.`);
     }
   }