diff --git a/.changeset/early-roses-flash.md b/.changeset/early-roses-flash.md
new file mode 100644
index 00000000000..dadcbcb5ccf
--- /dev/null
+++ b/.changeset/early-roses-flash.md
@@ -0,0 +1,6 @@
+---
+'@graphql-codegen/visitor-plugin-common': patch
+'@graphql-codegen/plugin-helpers': patch
+---
+
+fix(plugin-helpers): remove unnecessary import
diff --git a/package.json b/package.json
index ff8ae1bbd35..a552002697f 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,6 @@
   "name": "graphql-code-generator",
   "private": true,
   "scripts": {
-    "preinstall": "npx yarn-deduplicate",
     "postinstall": "patch-package && husky install",
     "clean": "rimraf node_modules packages/{*,plugins/*/*,presets/*,utils/*}/node_modules",
     "prebuild": "rimraf packages/{*,plugins/*/*,presets/*,utils/*}/dist",
diff --git a/packages/plugins/other/visitor-plugin-common/package.json b/packages/plugins/other/visitor-plugin-common/package.json
index dc6e14323b8..21826751d35 100644
--- a/packages/plugins/other/visitor-plugin-common/package.json
+++ b/packages/plugins/other/visitor-plugin-common/package.json
@@ -16,7 +16,7 @@
     "@graphql-tools/optimize": "^1.0.1",
     "@graphql-codegen/plugin-helpers": "^2.1.0",
     "@graphql-tools/relay-operation-optimizer": "^6.3.7",
-    "array.prototype.flatmap": "^1.2.4",
+    "@graphql-tools/utils": "8.1.1",
     "auto-bind": "~4.0.0",
     "dependency-graph": "^0.11.0",
     "graphql-tag": "^2.11.0",
@@ -28,7 +28,6 @@
     "graphql": "^0.8.0 || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 || ^15.0.0"
   },
   "devDependencies": {
-    "@types/array.prototype.flatmap": "1.2.2",
     "@types/parse-filepath": "1.0.0"
   },
   "main": "dist/index.js",
diff --git a/packages/plugins/other/visitor-plugin-common/src/base-resolvers-visitor.ts b/packages/plugins/other/visitor-plugin-common/src/base-resolvers-visitor.ts
index d4307a58d38..16bf7f2c1c7 100644
--- a/packages/plugins/other/visitor-plugin-common/src/base-resolvers-visitor.ts
+++ b/packages/plugins/other/visitor-plugin-common/src/base-resolvers-visitor.ts
@@ -15,7 +15,6 @@ import {
   indent,
   getBaseTypeNode,
   getConfigValue,
-  getRootTypeNames,
   stripMapperTypeInterpolation,
   OMIT_TYPE,
   REQUIRE_FIELDS_TYPE,
@@ -50,6 +49,7 @@ import { OperationVariablesToObject } from './variables-to-object';
 import { ParsedMapper, parseMapper, transformMappers, ExternalParsedMapper, buildMapperImport } from './mappers';
 import { parseEnumValues } from './enum-values';
 import { ApolloFederation, getBaseType } from '@graphql-codegen/plugin-helpers';
+import { getRootTypeNames } from '@graphql-tools/utils';
 
 export interface ParsedResolversConfig extends ParsedConfig {
   contextType: ParsedMapper;
@@ -349,8 +349,8 @@ export class BaseResolversVisitor<
   protected _usedMappers: { [key: string]: boolean } = {};
   protected _resolversTypes: ResolverTypes = {};
   protected _resolversParentTypes: ResolverParentTypes = {};
-  protected _rootTypeNames: string[] = [];
-  protected _globalDeclarations: Set<string> = new Set();
+  protected _rootTypeNames = new Set<string>();
+  protected _globalDeclarations = new Set<string>();
   protected _federation: ApolloFederation;
   protected _hasScalars = false;
   protected _hasFederation = false;
@@ -501,7 +501,7 @@ export class BaseResolversVisitor<
       }
 
       let shouldApplyOmit = false;
-      const isRootType = this._rootTypeNames.includes(typeName);
+      const isRootType = this._rootTypeNames.has(typeName);
       const isMapped = this.config.mappers[typeName];
       const isScalar = this.config.scalars[typeName];
       const hasDefaultMapper = !!(this.config.defaultMapper && this.config.defaultMapper.type);
diff --git a/packages/plugins/other/visitor-plugin-common/src/base-types-visitor.ts b/packages/plugins/other/visitor-plugin-common/src/base-types-visitor.ts
index d630d383a1d..02677bc19b0 100644
--- a/packages/plugins/other/visitor-plugin-common/src/base-types-visitor.ts
+++ b/packages/plugins/other/visitor-plugin-common/src/base-types-visitor.ts
@@ -20,7 +20,6 @@ import {
   Kind,
   GraphQLEnumType,
 } from 'graphql';
-import flatMap from 'array.prototype.flatmap';
 import { BaseVisitor, ParsedConfig, RawConfig } from './base-visitor';
 import { DEFAULT_SCALARS } from './scalars';
 import { normalizeDeclarationKind } from './declaration-kinds';
@@ -329,7 +328,7 @@ export class BaseTypesVisitor<
   }
 
   NonNullType(node: NonNullTypeNode): string {
-    const asString = (node.type as any) as string;
+    const asString = node.type as any as string;
 
     return asString;
   }
@@ -339,7 +338,7 @@ export class BaseTypesVisitor<
       .export()
       .asKind(this._parsedConfig.declarationKind.input)
       .withName(this.convertName(node))
-      .withComment((node.description as any) as string)
+      .withComment(node.description as any as string)
       .withBlock(node.fields.join('\n'));
   }
 
@@ -348,7 +347,7 @@ export class BaseTypesVisitor<
   }
 
   InputValueDefinition(node: InputValueDefinitionNode): string {
-    const comment = transformComment((node.description as any) as string, 1);
+    const comment = transformComment(node.description as any as string, 1);
     const { input } = this._parsedConfig.declarationKind;
 
     return comment + indent(`${node.name}: ${node.type}${this.getPunctuation(input)}`);
@@ -359,7 +358,7 @@ export class BaseTypesVisitor<
   }
 
   FieldDefinition(node: FieldDefinitionNode): string {
-    const typeString = (node.type as any) as string;
+    const typeString = node.type as any as string;
     const { type } = this._parsedConfig.declarationKind;
     const comment = this.getFieldComment(node);
 
@@ -377,7 +376,7 @@ export class BaseTypesVisitor<
       .export()
       .asKind('type')
       .withName(this.convertName(node))
-      .withComment((node.description as any) as string)
+      .withComment(node.description as any as string)
       .withContent(possibleTypes).string;
   }
 
@@ -414,7 +413,7 @@ export class BaseTypesVisitor<
       .export()
       .asKind(type)
       .withName(this.convertName(node))
-      .withComment((node.description as any) as string);
+      .withComment(node.description as any as string);
 
     if (type === 'interface' || type === 'class') {
       if (interfacesNames.length > 0) {
@@ -463,7 +462,7 @@ export class BaseTypesVisitor<
       .export()
       .asKind(this._parsedConfig.declarationKind.interface)
       .withName(this.convertName(node))
-      .withComment((node.description as any) as string);
+      .withComment(node.description as any as string);
 
     return declarationBlock.withBlock(node.fields.join('\n'));
   }
@@ -509,28 +508,30 @@ export class BaseTypesVisitor<
   }
 
   public getEnumsImports(): string[] {
-    return flatMap(Object.keys(this.config.enumValues), enumName => {
-      const mappedValue = this.config.enumValues[enumName];
-
-      if (mappedValue.sourceFile) {
-        if (mappedValue.isDefault) {
-          return [this._buildTypeImport(mappedValue.typeIdentifier, mappedValue.sourceFile, true)];
+    return Object.keys(this.config.enumValues)
+      .flatMap(enumName => {
+        const mappedValue = this.config.enumValues[enumName];
+
+        if (mappedValue.sourceFile) {
+          if (mappedValue.isDefault) {
+            return [this._buildTypeImport(mappedValue.typeIdentifier, mappedValue.sourceFile, true)];
+          }
+
+          return this.handleEnumValueMapper(
+            mappedValue.typeIdentifier,
+            mappedValue.importIdentifier,
+            mappedValue.sourceIdentifier,
+            mappedValue.sourceFile
+          );
         }
 
-        return this.handleEnumValueMapper(
-          mappedValue.typeIdentifier,
-          mappedValue.importIdentifier,
-          mappedValue.sourceIdentifier,
-          mappedValue.sourceFile
-        );
-      }
-
-      return [];
-    }).filter(a => a);
+        return [];
+      })
+      .filter(Boolean);
   }
 
   EnumTypeDefinition(node: EnumTypeDefinitionNode): string {
-    const enumName = (node.name as any) as string;
+    const enumName = node.name as any as string;
 
     // In case of mapped external enum string
     if (this.config.enumValues[enumName] && this.config.enumValues[enumName].sourceFile) {
@@ -541,7 +542,7 @@ export class BaseTypesVisitor<
       .export()
       .asKind('enum')
       .withName(this.convertName(node, { useTypesPrefix: this.config.enumPrefix }))
-      .withComment((node.description as any) as string)
+      .withComment(node.description as any as string)
       .withBlock(this.buildEnumValuesBlock(enumName, node.values)).string;
   }
 
@@ -567,7 +568,7 @@ export class BaseTypesVisitor<
         const optionName = this.makeValidEnumIdentifier(
           this.convertName(enumOption, { useTypesPrefix: false, transformUnderscore: true })
         );
-        const comment = transformComment((enumOption.description as any) as string, 1);
+        const comment = transformComment(enumOption.description as any as string, 1);
         const schemaEnumValue =
           schemaEnumType && !this.config.ignoreEnumValuesFromSchema
             ? schemaEnumType.getValue(enumOption.name as any).value
@@ -644,7 +645,7 @@ export class BaseTypesVisitor<
   }
 
   protected _getTypeForNode(node: NamedTypeNode): string {
-    const typeAsString = (node.name as any) as string;
+    const typeAsString = node.name as any as string;
 
     if (this.scalars[typeAsString]) {
       return this._getScalar(typeAsString);
@@ -674,7 +675,7 @@ export class BaseTypesVisitor<
   }
 
   ListType(node: ListTypeNode): string {
-    const asString = (node.type as any) as string;
+    const asString = node.type as any as string;
 
     return this.wrapWithListType(asString);
   }
diff --git a/packages/plugins/other/visitor-plugin-common/src/optimize-operations.ts b/packages/plugins/other/visitor-plugin-common/src/optimize-operations.ts
index 0824e3d58e2..a54f22edcb9 100644
--- a/packages/plugins/other/visitor-plugin-common/src/optimize-operations.ts
+++ b/packages/plugins/other/visitor-plugin-common/src/optimize-operations.ts
@@ -13,8 +13,8 @@ export function optimizeOperations(
     options
   );
 
-  return newDocuments.map(document => ({
-    location: 'optimized by relay',
+  return newDocuments.map((document, index) => ({
+    location: documents[index]?.location || 'optimized by relay',
     document,
   }));
 }
diff --git a/packages/plugins/other/visitor-plugin-common/src/selection-set-to-object.ts b/packages/plugins/other/visitor-plugin-common/src/selection-set-to-object.ts
index 32aeff80beb..00db53c56ce 100644
--- a/packages/plugins/other/visitor-plugin-common/src/selection-set-to-object.ts
+++ b/packages/plugins/other/visitor-plugin-common/src/selection-set-to-object.ts
@@ -40,6 +40,7 @@ import {
   NameAndType,
 } from './selection-set-processor/base';
 import autoBind from 'auto-bind';
+import { getRootTypes } from '@graphql-tools/utils';
 
 type FragmentSpreadUsage = {
   fragmentName: string;
@@ -485,14 +486,6 @@ export class SelectionSetToObject<Config extends ParsedDocumentsConfig = ParsedD
     return this._processor.buildSelectionSetFromStrings(fields);
   }
 
-  protected isRootType(type: GraphQLObjectType): boolean {
-    const rootType = [this._schema.getQueryType(), this._schema.getMutationType(), this._schema.getSubscriptionType()]
-      .filter(Boolean)
-      .map(t => t.name);
-
-    return rootType.includes(type.name);
-  }
-
   protected buildTypeNameField(
     type: GraphQLObjectType,
     nonOptionalTypename: boolean = this._config.nonOptionalTypename,
@@ -500,7 +493,8 @@ export class SelectionSetToObject<Config extends ParsedDocumentsConfig = ParsedD
     queriedForTypename: boolean = this._queriedForTypename,
     skipTypeNameForRoot: boolean = this._config.skipTypeNameForRoot
   ): { name: string; type: string } {
-    if (this.isRootType(type) && skipTypeNameForRoot && !queriedForTypename) {
+    const rootTypes = getRootTypes(this._schema);
+    if (rootTypes.has(type) && skipTypeNameForRoot && !queriedForTypename) {
       return null;
     }
 
diff --git a/packages/plugins/other/visitor-plugin-common/src/utils.ts b/packages/plugins/other/visitor-plugin-common/src/utils.ts
index 48210399823..06e98ccb7b3 100644
--- a/packages/plugins/other/visitor-plugin-common/src/utils.ts
+++ b/packages/plugins/other/visitor-plugin-common/src/utils.ts
@@ -9,7 +9,6 @@ import {
   GraphQLSchema,
   GraphQLScalarType,
   StringValueNode,
-  isEqualType,
   SelectionSetNode,
   FieldNode,
   SelectionNode,
@@ -340,14 +339,7 @@ function isStringValueNode(node: any): node is StringValueNode {
   return node && typeof node === 'object' && node.kind === Kind.STRING;
 }
 
-export function isRootType(type: GraphQLNamedType, schema: GraphQLSchema): type is GraphQLObjectType {
-  return (
-    isEqualType(type, schema.getQueryType()) ||
-    isEqualType(type, schema.getMutationType()) ||
-    isEqualType(type, schema.getSubscriptionType())
-  );
-}
-
+// will be removed on next release because tools already has it
 export function getRootTypeNames(schema: GraphQLSchema): string[] {
   return [schema.getQueryType(), schema.getMutationType(), schema.getSubscriptionType()]
     .filter(t => t)
diff --git a/packages/utils/plugins-helpers/src/federation.ts b/packages/utils/plugins-helpers/src/federation.ts
index 22d4a1d4a0f..2d9e4c65f20 100644
--- a/packages/utils/plugins-helpers/src/federation.ts
+++ b/packages/utils/plugins-helpers/src/federation.ts
@@ -14,8 +14,7 @@ import {
 } from 'graphql';
 import merge from 'lodash/merge.js';
 import { getBaseType } from './utils';
-import { MapperKind, mapSchema, astFromObjectType } from '@graphql-tools/utils';
-import { getRootTypeNames } from '@graphql-codegen/visitor-plugin-common';
+import { MapperKind, mapSchema, astFromObjectType, getRootTypeNames } from '@graphql-tools/utils';
 
 /**
  * Federation Spec
@@ -296,7 +295,7 @@ function isFederationObjectType(node: ObjectTypeDefinitionNode | GraphQLObjectTy
   } = isObjectType(node) ? astFromObjectType(node, schema) : node;
 
   const rootTypeNames = getRootTypeNames(schema);
-  const isNotRoot = !rootTypeNames.includes(name);
+  const isNotRoot = !rootTypeNames.has(name);
   const isNotIntrospection = !name.startsWith('__');
   const hasKeyDirective = directives.some(d => d.name.value === 'key');
 
diff --git a/yarn.lock b/yarn.lock
index 707a2c549c3..99bf597b984 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2938,11 +2938,6 @@
   dependencies:
     "@types/node" "*"
 
-"@types/array.prototype.flatmap@1.2.2":
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/@types/array.prototype.flatmap/-/array.prototype.flatmap-1.2.2.tgz#9041c2dc907d583ffb80b8882a782b42436d57c1"
-  integrity sha512-dto5M/8GxPzjaScvQeft2IG0EkoZZfPg2+1noM2BWiU1VR2zsGHf76LonTOnLQKDuJlKDLzKaru4b+5Sci0Yhg==
-
 "@types/babel__core@^7.0.0", "@types/babel__core@^7.1.14":
   version "7.1.15"
   resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.15.tgz#2ccfb1ad55a02c83f8e0ad327cbc332f55eb1024"
@@ -3221,7 +3216,12 @@
   resolved "https://registry.yarnpkg.com/@types/ms/-/ms-0.7.31.tgz#31b7ca6407128a3d2bbc27fe2d21b345397f6197"
   integrity sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==
 
-"@types/node@*", "@types/node@14.17.11", "@types/node@^14.14.33":
+"@types/node@*", "@types/node@^16.4.10":
+  version "16.4.13"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.4.13.tgz#7dfd9c14661edc65cccd43a29eb454174642370d"
+  integrity sha512-bLL69sKtd25w7p1nvg9pigE4gtKVpGTPojBFLMkGHXuUgap2sLqQt2qUnqmVCDfzGUL0DRNZP+1prIZJbMeAXg==
+
+"@types/node@14.17.11", "@types/node@^14.14.33":
   version "14.17.11"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.17.11.tgz#82d266d657aec5ff01ca59f2ffaff1bb43f7bf0f"
   integrity sha512-n2OQ+0Bz6WEsUjrvcHD1xZ8K+Kgo4cn9/w94s1bJS690QMUWfJPW/m7CCb7gPkA1fcYwL2UpjXP/rq/Eo41m6w==
@@ -3241,11 +3241,6 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-15.14.7.tgz#29fea9a5b14e2b75c19028e1c7a32edd1e89fe92"
   integrity sha512-FA45p37/mLhpebgbPWWCKfOisTjxGK9lwcHlJ6XVLfu3NgfcazOJHdYUZCWPMK8QX4LhNZdmfo6iMz9FqpUbaw==
 
-"@types/node@^16.4.10":
-  version "16.4.13"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.4.13.tgz#7dfd9c14661edc65cccd43a29eb454174642370d"
-  integrity sha512-bLL69sKtd25w7p1nvg9pigE4gtKVpGTPojBFLMkGHXuUgap2sLqQt2qUnqmVCDfzGUL0DRNZP+1prIZJbMeAXg==
-
 "@types/normalize-package-data@^2.4.0":
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/@types/normalize-package-data/-/normalize-package-data-2.4.1.tgz#d3357479a0fdfdd5907fe67e17e0a85c906e1301"
@@ -4170,16 +4165,6 @@ array.prototype.flat@^1.2.4:
     define-properties "^1.1.3"
     es-abstract "^1.18.0-next.1"
 
-array.prototype.flatmap@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/array.prototype.flatmap/-/array.prototype.flatmap-1.2.4.tgz#94cfd47cc1556ec0747d97f7c7738c58122004c9"
-  integrity sha512-r9Z0zYoxqHz60vvQbWEdXIEtCwHF0yxaWfno9qzXeNHvfyl3BZqygmGzb84dsubyaXLH4husF+NFgMSdpZhk2Q==
-  dependencies:
-    call-bind "^1.0.0"
-    define-properties "^1.1.3"
-    es-abstract "^1.18.0-next.1"
-    function-bind "^1.1.1"
-
 arrify@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
@@ -13518,12 +13503,12 @@ rxjs@^6.3.3, rxjs@^6.4.0, rxjs@^6.5.1, rxjs@^6.6.0, rxjs@^6.6.3, rxjs@^6.6.7:
   dependencies:
     tslib "^1.9.0"
 
-safe-buffer@5.1.2, safe-buffer@>=5.1.0, safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
+safe-buffer@5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
   integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
 
-safe-buffer@^5.2.0, safe-buffer@~5.2.0:
+safe-buffer@>=5.1.0, safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@^5.2.0, safe-buffer@~5.2.0:
   version "5.2.1"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
   integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==