Add devAssert about removal of positional arguments

Fixes #3359

src/execution/execute.ts

@@ -165,6 +165,12 @@ export interface ExecutionArgs {
  * a GraphQLError will be thrown immediately explaining the invalid input.
  */
 export function execute(args: ExecutionArgs): PromiseOrValue<ExecutionResult> {
+  // Temporary for v15 to v16 migration. Remove in v17
+  devAssert(
+    arguments.length < 2,
+    'graphql@16 droped long-deprecated support for positional arguments, please pass an object instead',
+  );
+
   const { schema, document, variableValues, rootValue } = args;
 
   // If arguments are missing or incorrect, throw an error.

src/execution/subscribe.ts

@@ -1,4 +1,5 @@
 import { inspect } from '../jsutils/inspect';
+import { devAssert } from '../jsutils/devAssert';
 import { isAsyncIterable } from '../jsutils/isAsyncIterable';
 import { addPath, pathToArray } from '../jsutils/Path';
 import type { Maybe } from '../jsutils/Maybe';
@@ -51,6 +52,12 @@ import { mapAsyncIterator } from './mapAsyncIterator';
 export async function subscribe(
   args: ExecutionArgs,
 ): Promise<AsyncGenerator<ExecutionResult, void, void> | ExecutionResult> {
+  // Temporary for v15 to v16 migration. Remove in v17
+  devAssert(
+    arguments.length < 2,
+    'graphql@16 droped long-deprecated support for positional arguments, please pass an object instead',
+  );
+
   const {
     schema,
     document,

src/graphql.ts

@@ -1,4 +1,5 @@
 import type { PromiseOrValue } from './jsutils/PromiseOrValue';
+import { devAssert } from './jsutils/devAssert';
 import { isPromise } from './jsutils/isPromise';
 import type { Maybe } from './jsutils/Maybe';
 
@@ -90,6 +91,12 @@ export function graphqlSync(args: GraphQLArgs): ExecutionResult {
 }
 
 function graphqlImpl(args: GraphQLArgs): PromiseOrValue<ExecutionResult> {
+  // Temporary for v15 to v16 migration. Remove in v17
+  devAssert(
+    arguments.length < 2,
+    'graphql@16 droped long-deprecated support for positional arguments, please pass an object instead',
+  );
+
   const {
     schema,
     source,