diff --git a/packages/graphql-language-service/src/types.js.flow b/packages/graphql-language-service/src/types.js.flow
deleted file mode 100644
index 8753a15b67b..00000000000
--- a/packages/graphql-language-service/src/types.js.flow
+++ /dev/null
@@ -1,356 +0,0 @@
-/**
- *  Copyright (c) 2021 GraphQL Contributors
- *  All rights reserved.
- *
- *  This source code is licensed under the license found in the
- *  LICENSE file in the root directory of this source tree.
- *
- *  @flow
- */
-
-import type { GraphQLSchema } from 'graphql';
-import type {
-  ASTNode,
-  DocumentNode,
-  FragmentDefinitionNode,
-  NamedTypeNode,
-  TypeDefinitionNode,
-} from 'graphql/language';
-import type { ValidationContext } from 'graphql/validation';
-import type {
-  GraphQLArgument,
-  GraphQLEnumValue,
-  GraphQLField,
-  GraphQLInputField,
-  GraphQLType,
-} from 'graphql/type/definition';
-import type { GraphQLDirective } from 'graphql/type/directives';
-
-export type { GraphQLConfig, GraphQLProjectConfig } from 'graphql-config';
-import type { GraphQLConfig, GraphQLProjectConfig } from 'graphql-config';
-
-export type TokenPattern = string | ((char: string) => boolean) | RegExp;
-
-export interface CharacterStream {
-  getStartOfToken: () => number;
-  getCurrentPosition: () => number;
-  eol: () => boolean;
-  sol: () => boolean;
-  peek: () => string | null;
-  next: () => string;
-  eat: (pattern: TokenPattern) => string | void;
-  eatWhile: (match: TokenPattern) => boolean;
-  eatSpace: () => boolean;
-  skipToEnd: () => void;
-  skipTo: (position: number) => void;
-  match: (
-    pattern: TokenPattern,
-    consume: ?boolean,
-    caseFold: ?boolean,
-  ) => Array<string> | boolean;
-  backUp: (num: number) => void;
-  column: () => number;
-  indentation: () => number;
-  current: () => string;
-}
-
-// Cache and config-related.
-export type GraphQLConfiguration = GraphQLProjectConfiguration & {
-  projects?: {
-    [projectName: string]: GraphQLProjectConfiguration,
-  },
-};
-
-export type GraphQLProjectConfiguration = {
-  // The name for this project configuration.
-  // If not supplied, the object key can be used for the project name.
-  name?: string,
-  schemaPath?: string, // a file with schema IDL
-
-  // For multiple applications with overlapping files,
-  // these configuration options may be helpful
-  includes?: Array<string>,
-  excludes?: Array<string>,
-
-  // If you'd like to specify any other configurations,
-  // we provide a reserved namespace for it
-  extensions?: GraphQLConfigurationExtension,
-};
-
-export type GraphQLConfigurationExtension = {
-  [name: string]: mixed,
-};
-
-export interface GraphQLCache {
-  getGraphQLConfig: () => GraphQLConfig;
-
-  getObjectTypeDependencies: (
-    query: string,
-    fragmentDefinitions: ?Map<string, ObjectTypeInfo>,
-  ) => Promise<Array<ObjectTypeInfo>>;
-
-  getObjectTypeDependenciesForAST: (
-    parsedQuery: ASTNode,
-    fragmentDefinitions: Map<string, ObjectTypeInfo>,
-  ) => Promise<Array<ObjectTypeInfo>>;
-
-  getObjectTypeDefinitions: (
-    graphQLConfig: GraphQLProjectConfig,
-  ) => Promise<Map<string, ObjectTypeInfo>>;
-
-  +updateObjectTypeDefinition: (
-    rootDir: Uri,
-    filePath: Uri,
-    contents: Array<CachedContent>,
-  ) => Promise<void>;
-
-  +updateObjectTypeDefinitionCache: (
-    rootDir: Uri,
-    filePath: Uri,
-    exists: boolean,
-  ) => Promise<void>;
-
-  getFragmentDependencies: (
-    query: string,
-    fragmentDefinitions: ?Map<string, FragmentInfo>,
-  ) => Promise<Array<FragmentInfo>>;
-
-  getFragmentDependenciesForAST: (
-    parsedQuery: ASTNode,
-    fragmentDefinitions: Map<string, FragmentInfo>,
-  ) => Promise<Array<FragmentInfo>>;
-
-  getFragmentDefinitions: (
-    graphQLConfig: GraphQLProjectConfig,
-  ) => Promise<Map<string, FragmentInfo>>;
-
-  +updateFragmentDefinition: (
-    rootDir: Uri,
-    filePath: Uri,
-    contents: Array<CachedContent>,
-  ) => Promise<void>;
-
-  +updateFragmentDefinitionCache: (
-    rootDir: Uri,
-    filePath: Uri,
-    exists: boolean,
-  ) => Promise<void>;
-
-  getSchema: (
-    appName: ?string,
-    queryHasExtensions?: ?boolean,
-  ) => Promise<?GraphQLSchema>;
-
-  handleWatchmanSubscribeEvent: (
-    rootDir: string,
-    projectConfig: GraphQLProjectConfig,
-  ) => (result: Object) => void;
-}
-
-// online-parser related
-export interface IPosition {
-  line: number;
-  character: number;
-  lessThanOrEqualTo: (position: IPosition) => boolean;
-}
-
-export interface IRange {
-  start: IPosition;
-  end: IPosition;
-  containsPosition: (position: IPosition) => boolean;
-}
-
-export type CachedContent = {
-  query: string,
-  range: ?Range,
-};
-
-export type ParseRule =
-  | ((token: Token, stream: CharacterStream) => ?string)
-  | Array<Rule | string>;
-
-export type Token = {
-  kind: string,
-  value: string,
-};
-
-export type Rule = {
-  style?: string,
-  match?: (token: Token) => boolean,
-  update?: (state: State, token: Token) => void,
-  separator?: string | Rule,
-  isList?: boolean,
-  ofRule?: Rule | string,
-};
-
-export type State = {
-  level: number,
-  levels?: Array<number>,
-  prevState: ?State,
-  rule: ?ParseRule,
-  kind: ?string,
-  name: ?string,
-  type: ?string,
-  step: number,
-  needsSeparator: boolean,
-  needsAdvance?: boolean,
-  indentLevel?: number,
-};
-
-// GraphQL Language Service related types
-export type Uri = string;
-
-export type GraphQLFileMetadata = {
-  filePath: Uri,
-  size: number,
-  mtime: number,
-};
-
-export type GraphQLFileInfo = {
-  filePath: Uri,
-  content: string,
-  asts: Array<DocumentNode>,
-  size: number,
-  mtime: number,
-};
-
-export type ContextToken = {
-  start: number,
-  end: number,
-  string: string,
-  state: State,
-  style: string,
-};
-
-export type ContextTokenForCodeMirror = {
-  start: number,
-  end: number,
-  string: string,
-  type: string | null,
-  state: State,
-};
-
-export type ContextTokenUnion = ContextToken | ContextTokenForCodeMirror;
-
-export type TypeInfo = {
-  type: ?GraphQLType,
-  parentType: ?GraphQLType,
-  inputType: ?GraphQLType,
-  directiveDef: ?GraphQLDirective,
-  fieldDef: ?GraphQLField<*, *>,
-  enumValue: ?GraphQLEnumValue,
-  argDef: ?GraphQLArgument,
-  argDefs: ?Array<GraphQLArgument>,
-  objectFieldDefs: ?GraphQLInputField,
-};
-
-export type FragmentInfo = {
-  filePath?: Uri,
-  content: string,
-  definition: FragmentDefinitionNode,
-};
-
-export type NamedTypeInfo = {
-  filePath?: Uri,
-  content: string,
-  definition: NamedTypeNode,
-};
-
-export type ObjectTypeInfo = {
-  filePath?: Uri,
-  content: string,
-  definition: TypeDefinitionNode,
-};
-
-export type Diagnostic = {
-  range: Range,
-  severity?: number,
-  code?: number | string,
-  source?: string,
-  message: string,
-};
-
-export type CompletionItem = {
-  label: string,
-  kind?: number,
-  detail?: string,
-  documentation?: ?string,
-  // GraphQL Deprecation information
-  isDeprecated?: ?boolean,
-  deprecationReason?: ?string,
-  type?: GraphQLType,
-};
-
-export type CompletionItemBase = {
-  label: string,
-  isDeprecated?: boolean,
-};
-
-export type CompletionItemForCodeMirror = {
-  label: string,
-  type?: GraphQLType,
-  documentation?: ?string,
-  isDeprecated?: boolean,
-  deprecationReason?: ?string,
-};
-
-// Below are basically a copy-paste from Nuclide rpc types for definitions.
-
-// Definitions/hyperlink
-export type Definition = {
-  path: Uri,
-  position: Position,
-  range?: Range,
-  id?: string,
-  name?: string,
-  language: string,
-  projectRoot?: Uri,
-};
-export type DefinitionQueryResult = {
-  queryRange: Array<Range>,
-  definitions: Array<Definition>,
-};
-
-// Outline view
-export type TokenKind =
-  | 'keyword'
-  | 'class-name'
-  | 'constructor'
-  | 'method'
-  | 'param'
-  | 'string'
-  | 'whitespace'
-  | 'plain'
-  | 'type';
-export type TextToken = {
-  kind: TokenKind,
-  value: string,
-};
-export type TokenizedText = Array<TextToken>;
-export type OutlineTree = {
-  // Must be one or the other. If both are present, tokenizedText is preferred.
-  plainText?: string,
-  tokenizedText?: TokenizedText,
-  representativeName?: string,
-
-  startPosition: Position,
-  endPosition?: Position,
-  children: Array<OutlineTree>,
-};
-export type Outline = {
-  outlineTrees: Array<OutlineTree>,
-};
-
-export interface DidChangeWatchedFilesParams {
-  changes: FileEvent[];
-}
-export interface FileEvent {
-  uri: string;
-  type: FileChangeType;
-}
-export const FileChangeTypeKind = {
-  Created: 1,
-  Changed: 2,
-  Deleted: 3,
-};
-export type FileChangeType = $Values<typeof FileChangeTypeKind>;