diff --git a/src/execution/execute.d.ts b/src/execution/execute.d.ts
index 572c412e3a..1db6f20b06 100644
--- a/src/execution/execute.d.ts
+++ b/src/execution/execute.d.ts
@@ -1,4 +1,5 @@
 import { Maybe } from '../jsutils/Maybe';
+import { ObjMap } from '../jsutils/ObjMap';
 
 import { PromiseOrValue } from '../jsutils/PromiseOrValue';
 import { Path } from '../jsutils/Path';
@@ -50,9 +51,9 @@ import {
  */
 export interface ExecutionContext {
   schema: GraphQLSchema;
-  fragments: { [key: string]: FragmentDefinitionNode };
   rootValue: unknown;
   contextValue: unknown;
+  fragments: ObjMap<FragmentDefinitionNode>;
   operation: OperationDefinitionNode;
   variableValues: { [key: string]: unknown };
   fieldResolver: GraphQLFieldResolver<any, any>;
@@ -162,9 +163,9 @@ export function collectFields(
   exeContext: ExecutionContext,
   runtimeType: GraphQLObjectType,
   selectionSet: SelectionSetNode,
-  fields: { [key: string]: Array<FieldNode> },
-  visitedFragmentNames: { [key: string]: boolean },
-): { [key: string]: Array<FieldNode> };
+  fields: ObjMap<Array<FieldNode>>,
+  visitedFragmentNames: ObjMap<boolean>,
+): ObjMap<Array<FieldNode>>;
 
 /**
  * @internal
diff --git a/src/execution/values.d.ts b/src/execution/values.d.ts
index b2a01dbee5..b88943a04d 100644
--- a/src/execution/values.d.ts
+++ b/src/execution/values.d.ts
@@ -1,4 +1,5 @@
 import { Maybe } from '../jsutils/Maybe';
+import { ObjMap } from '../jsutils/ObjMap';
 
 import { GraphQLError } from '../error/GraphQLError';
 import {
@@ -42,7 +43,7 @@ export function getVariableValues(
 export function getArgumentValues(
   def: GraphQLField<unknown, unknown> | GraphQLDirective,
   node: FieldNode | DirectiveNode,
-  variableValues?: Maybe<{ [key: string]: unknown }>,
+  variableValues?: Maybe<ObjMap<unknown>>,
 ): { [key: string]: unknown };
 
 /**
@@ -61,5 +62,5 @@ export function getDirectiveValues(
   node: {
     readonly directives?: ReadonlyArray<DirectiveNode>;
   },
-  variableValues?: Maybe<{ [key: string]: unknown }>,
+  variableValues?: Maybe<ObjMap<unknown>>,
 ): undefined | { [key: string]: unknown };
diff --git a/src/type/definition.d.ts b/src/type/definition.d.ts
index d47eadd138..122f1efec3 100644
--- a/src/type/definition.d.ts
+++ b/src/type/definition.d.ts
@@ -336,7 +336,7 @@ export type GraphQLScalarValueParser<TInternal> = (
 ) => Maybe<TInternal>;
 export type GraphQLScalarLiteralParser<TInternal> = (
   valueNode: ValueNode,
-  variables: Maybe<{ [key: string]: unknown }>,
+  variables: Maybe<ObjMap<unknown>>,
 ) => Maybe<TInternal>;
 
 export interface GraphQLScalarTypeConfig<TInternal, TExternal> {
@@ -479,7 +479,7 @@ export interface GraphQLResolveInfo {
   readonly parentType: GraphQLObjectType;
   readonly path: Path;
   readonly schema: GraphQLSchema;
-  readonly fragments: { [key: string]: FragmentDefinitionNode };
+  readonly fragments: ObjMap<FragmentDefinitionNode>;
   readonly rootValue: unknown;
   readonly operation: OperationDefinitionNode;
   readonly variableValues: { [variableName: string]: unknown };
@@ -522,9 +522,7 @@ export interface GraphQLFieldConfig<
   astNode?: Maybe<FieldDefinitionNode>;
 }
 
-export interface GraphQLFieldConfigArgumentMap {
-  [key: string]: GraphQLArgumentConfig;
-}
+export type GraphQLFieldConfigArgumentMap = ObjMap<GraphQLArgumentConfig>;
 
 /**
  * Custom extensions
@@ -548,9 +546,9 @@ export interface GraphQLArgumentConfig {
   astNode?: Maybe<InputValueDefinitionNode>;
 }
 
-export interface GraphQLFieldConfigMap<TSource, TContext> {
-  [key: string]: GraphQLFieldConfig<TSource, TContext>;
-}
+export type GraphQLFieldConfigMap<TSource, TContext> = ObjMap<
+  GraphQLFieldConfig<TSource, TContext>
+>;
 
 export interface GraphQLField<
   TSource,
@@ -580,9 +578,9 @@ export interface GraphQLArgument {
 
 export function isRequiredArgument(arg: GraphQLArgument): boolean;
 
-export interface GraphQLFieldMap<TSource, TContext> {
-  [key: string]: GraphQLField<TSource, TContext>;
-}
+export type GraphQLFieldMap<TSource, TContext> = ObjMap<
+  GraphQLField<TSource, TContext>
+>;
 
 /**
  * Custom extensions
@@ -778,7 +776,7 @@ export class GraphQLEnumType {
   parseValue(value: unknown): Maybe<any>;
   parseLiteral(
     valueNode: ValueNode,
-    _variables: Maybe<{ [key: string]: unknown }>,
+    _variables: Maybe<ObjMap<unknown>>,
   ): Maybe<any>;
 
   toConfig(): GraphQLEnumTypeConfig & {
@@ -801,9 +799,7 @@ export interface GraphQLEnumTypeConfig {
   extensionASTNodes?: Maybe<ReadonlyArray<EnumTypeExtensionNode>>;
 }
 
-export interface GraphQLEnumValueConfigMap {
-  [key: string]: GraphQLEnumValueConfig;
-}
+export type GraphQLEnumValueConfigMap = ObjMap<GraphQLEnumValueConfig>;
 
 /**
  * Custom extensions
@@ -921,9 +917,7 @@ export interface GraphQLInputFieldConfig {
   astNode?: Maybe<InputValueDefinitionNode>;
 }
 
-export interface GraphQLInputFieldConfigMap {
-  [key: string]: GraphQLInputFieldConfig;
-}
+export type GraphQLInputFieldConfigMap = ObjMap<GraphQLInputFieldConfig>;
 
 export interface GraphQLInputField {
   name: string;
@@ -937,6 +931,4 @@ export interface GraphQLInputField {
 
 export function isRequiredInputField(field: GraphQLInputField): boolean;
 
-export interface GraphQLInputFieldMap {
-  [key: string]: GraphQLInputField;
-}
+export type GraphQLInputFieldMap = ObjMap<GraphQLInputField>;
diff --git a/src/type/schema.d.ts b/src/type/schema.d.ts
index f28e6b0847..e96f2da404 100644
--- a/src/type/schema.d.ts
+++ b/src/type/schema.d.ts
@@ -2,6 +2,7 @@
 /* eslint-disable import/no-cycle */
 
 import { Maybe } from '../jsutils/Maybe';
+import { ObjMap } from '../jsutils/ObjMap';
 
 import { SchemaDefinitionNode, SchemaExtensionNode } from '../language/ast';
 
@@ -97,9 +98,7 @@ export class GraphQLSchema {
   get [Symbol.toStringTag](): string;
 }
 
-interface TypeMap {
-  [key: string]: GraphQLNamedType;
-}
+type TypeMap = ObjMap<GraphQLNamedType>;
 
 interface InterfaceImplementations {
   objects: ReadonlyArray<GraphQLObjectType>;
diff --git a/src/utilities/separateOperations.d.ts b/src/utilities/separateOperations.d.ts
index 28654fdb1b..21552407d0 100644
--- a/src/utilities/separateOperations.d.ts
+++ b/src/utilities/separateOperations.d.ts
@@ -1,3 +1,4 @@
+import { ObjMap } from '../jsutils/ObjMap';
 import { DocumentNode } from '../language/ast';
 
 /**
@@ -8,4 +9,4 @@ import { DocumentNode } from '../language/ast';
  */
 export function separateOperations(
   documentAST: DocumentNode,
-): { [key: string]: DocumentNode };
+): ObjMap<DocumentNode>;
diff --git a/src/utilities/valueFromAST.d.ts b/src/utilities/valueFromAST.d.ts
index 2e5cefd604..6ea38000e1 100644
--- a/src/utilities/valueFromAST.d.ts
+++ b/src/utilities/valueFromAST.d.ts
@@ -1,4 +1,5 @@
 import { Maybe } from '../jsutils/Maybe';
+import { ObjMap } from '../jsutils/ObjMap';
 
 import { ValueNode } from '../language/ast';
 import { GraphQLInputType } from '../type/definition';
@@ -26,5 +27,5 @@ import { GraphQLInputType } from '../type/definition';
 export function valueFromAST(
   valueNode: Maybe<ValueNode>,
   type: GraphQLInputType,
-  variables?: Maybe<{ [key: string]: unknown }>,
+  variables?: Maybe<ObjMap<unknown>>,
 ): unknown;
diff --git a/src/utilities/valueFromASTUntyped.d.ts b/src/utilities/valueFromASTUntyped.d.ts
index b1c4e5d4b4..495e279723 100644
--- a/src/utilities/valueFromASTUntyped.d.ts
+++ b/src/utilities/valueFromASTUntyped.d.ts
@@ -1,4 +1,5 @@
 import { Maybe } from '../jsutils/Maybe';
+import { ObjMap } from '../jsutils/ObjMap';
 
 import { ValueNode } from '../language/ast';
 
@@ -20,5 +21,5 @@ import { ValueNode } from '../language/ast';
  */
 export function valueFromASTUntyped(
   valueNode: ValueNode,
-  variables?: Maybe<{ [key: string]: unknown }>,
+  variables?: Maybe<ObjMap<unknown>>,
 ): unknown;