Remove 'devAssert' checks that duplicate TS types (#3642)

`graphql` provides TS types since `14.5.0` (released 3 years ago)
and we fully switched to TS in `15.0.0` so I think it's time to drop
runtime typechecks.

Motivations: This type checks were added long time ago since we shifted
towards TS we just maintained them without adding new ones.
In general, this check increase bundle size add runtime cost and we
can't realistically check all arguments to all functions.
Instead we should focus on adding more asserts on stuff that can't be
checked by TS.

src/execution/__tests__/executor-test.ts

@@ -22,54 +22,6 @@ import { GraphQLSchema } from '../../type/schema';
 import { execute, executeSync } from '../execute';
 
 describe('Execute: Handles basic execution tasks', () => {
-  it('throws if no document is provided', () => {
-    const schema = new GraphQLSchema({
-      query: new GraphQLObjectType({
-        name: 'Type',
-        fields: {
-          a: { type: GraphQLString },
-        },
-      }),
-    });
-
-    // @ts-expect-error
-    expect(() => executeSync({ schema })).to.throw('Must provide document.');
-  });
-
-  it('throws if no schema is provided', () => {
-    const document = parse('{ field }');
-
-    // @ts-expect-error
-    expect(() => executeSync({ document })).to.throw(
-      'Expected undefined to be a GraphQL schema.',
-    );
-  });
-
-  it('throws on invalid variables', () => {
-    const schema = new GraphQLSchema({
-      query: new GraphQLObjectType({
-        name: 'Type',
-        fields: {
-          fieldA: {
-            type: GraphQLString,
-            args: { argA: { type: GraphQLInt } },
-          },
-        },
-      }),
-    });
-    const document = parse(`
-      query ($a: Int) {
-        fieldA(argA: $a)
-      }
-    `);
-    const variableValues = '{ "a": 1 }';
-
-    // @ts-expect-error
-    expect(() => executeSync({ schema, document, variableValues })).to.throw(
-      'Variables must be provided as an Object where each property is a variable value. Perhaps look to see if an unparsed JSON string was provided.',
-    );
-  });
-
   it('executes arbitrary code', async () => {
     const data = {
       a: () => 'Apple',

src/execution/__tests__/subscribe-test.ts

@@ -390,37 +390,6 @@ describe('Subscription Initialization Phase', () => {
     });
   });
 
-  it('throws an error if some of required arguments are missing', async () => {
-    const document = parse('subscription { foo }');
-    const schema = new GraphQLSchema({
-      query: DummyQueryType,
-      subscription: new GraphQLObjectType({
-        name: 'Subscription',
-        fields: {
-          foo: { type: GraphQLString },
-        },
-      }),
-    });
-
-    // @ts-expect-error (schema must not be null)
-    expect(() => subscribe({ schema: null, document })).to.throw(
-      'Expected null to be a GraphQL schema.',
-    );
-
-    // @ts-expect-error
-    expect(() => subscribe({ document })).to.throw(
-      'Expected undefined to be a GraphQL schema.',
-    );
-
-    // @ts-expect-error (document must not be null)
-    expect(() => subscribe({ schema, document: null })).to.throw(
-      'Must provide document.',
-    );
-
-    // @ts-expect-error
-    expect(() => subscribe({ schema })).to.throw('Must provide document.');
-  });
-
   it('resolves to an error if schema does not support subscriptions', async () => {
     const schema = new GraphQLSchema({ query: DummyQueryType });
     const document = parse('subscription { unknownField }');

src/execution/execute.ts

@@ -1,4 +1,3 @@
-import { devAssert } from '../jsutils/devAssert';
 import { inspect } from '../jsutils/inspect';
 import { invariant } from '../jsutils/invariant';
 import { isAsyncIterable } from '../jsutils/isAsyncIterable';
@@ -239,21 +238,9 @@ function buildResponse(
  * TODO: consider no longer exporting this function
  * @internal
  */
-export function assertValidExecutionArguments(
-  schema: GraphQLSchema,
-  document: DocumentNode,
-  rawVariableValues: Maybe<{ readonly [variable: string]: unknown }>,
-): void {
-  devAssert(document != null, 'Must provide document.');
-
+export function assertValidExecutionArguments(schema: GraphQLSchema): void {
   // If the schema used for execution is invalid, throw an error.
   assertValidSchema(schema);
-
-  // Variables, if provided, must be an object.
-  devAssert(
-    rawVariableValues == null || isObjectLike(rawVariableValues),
-    'Variables must be provided as an Object where each property is a variable value. Perhaps look to see if an unparsed JSON string was provided.',
-  );
 }
 
 /**
@@ -281,7 +268,7 @@ export function buildExecutionContext(
   } = args;
 
   // If arguments are missing or incorrect, throw an error.
-  assertValidExecutionArguments(schema, document, rawVariableValues);
+  assertValidExecutionArguments(schema);
 
   let operation: OperationDefinitionNode | undefined;
   const fragments: ObjMap<FragmentDefinitionNode> = Object.create(null);

src/language/__tests__/source-test.ts

@@ -4,20 +4,6 @@ import { describe, it } from 'mocha';
 import { Source } from '../source';
 
 describe('Source', () => {
-  it('asserts that a body was provided', () => {
-    // @ts-expect-error
-    expect(() => new Source()).to.throw(
-      'Body must be a string. Received: undefined.',
-    );
-  });
-
-  it('asserts that a valid body was provided', () => {
-    // @ts-expect-error
-    expect(() => new Source({})).to.throw(
-      'Body must be a string. Received: {}.',
-    );
-  });
-
   it('can be Object.toStringified', () => {
     const source = new Source('');
 

src/language/source.ts

@@ -1,5 +1,4 @@
 import { devAssert } from '../jsutils/devAssert';
-import { inspect } from '../jsutils/inspect';
 import { instanceOf } from '../jsutils/instanceOf';
 
 interface Location {
@@ -24,11 +23,6 @@ export class Source {
     name: string = 'GraphQL request',
     locationOffset: Location = { line: 1, column: 1 },
   ) {
-    devAssert(
-      typeof body === 'string',
-      `Body must be a string. Received: ${inspect(body)}.`,
-    );
-
     this.body = body;
     this.name = name;
     this.locationOffset = locationOffset;

src/type/__tests__/assertName-test.ts

@@ -8,11 +8,6 @@ describe('assertName', () => {
     expect(assertName('_ValidName123')).to.equal('_ValidName123');
   });
 
-  it('throws for non-strings', () => {
-    // @ts-expect-error
-    expect(() => assertName({})).to.throw('Expected name to be a string.');
-  });
-
   it('throws on empty strings', () => {
     expect(() => assertName('')).to.throw(
       'Expected name to be a non-empty string.',