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+// @flow strict
+import objectValues from '../polyfills/objectValues';
+
+import keyMap from '../jsutils/keyMap';
+import inspect from '../jsutils/inspect';
+import invariant from '../jsutils/invariant';
+import naturalCompare from '../jsutils/naturalCompare';
+
+import { print } from '../language/printer';
+import { visit } from '../language/visitor';
+
+import type { GraphQLSchema } from '../type/schema';
+import type {
+  GraphQLField,
+  GraphQLType,
+  GraphQLInputType,
+  GraphQLNamedType,
+  GraphQLEnumType,
+  GraphQLUnionType,
+  GraphQLObjectType,
+  GraphQLInterfaceType,
+  GraphQLInputObjectType,
+} from '../type/definition';
+import { isSpecifiedScalarType } from '../type/scalars';
+import {
+  isScalarType,
+  isObjectType,
+  isInterfaceType,
+  isUnionType,
+  isEnumType,
+  isInputObjectType,
+  isNonNullType,
+  isListType,
+  isNamedType,
+  isRequiredArgument,
+  isRequiredInputField,
+} from '../type/definition';
+
+import { astFromValue } from './astFromValue';
+
+export const BreakingChangeType = Object.freeze({
+  TYPE_REMOVED: 'TYPE_REMOVED',
+  TYPE_CHANGED_KIND: 'TYPE_CHANGED_KIND',
+  TYPE_REMOVED_FROM_UNION: 'TYPE_REMOVED_FROM_UNION',
+  VALUE_REMOVED_FROM_ENUM: 'VALUE_REMOVED_FROM_ENUM',
+  REQUIRED_INPUT_FIELD_ADDED: 'REQUIRED_INPUT_FIELD_ADDED',
+  IMPLEMENTED_INTERFACE_REMOVED: 'IMPLEMENTED_INTERFACE_REMOVED',
+  FIELD_REMOVED: 'FIELD_REMOVED',
+  FIELD_CHANGED_KIND: 'FIELD_CHANGED_KIND',
+  REQUIRED_ARG_ADDED: 'REQUIRED_ARG_ADDED',
+  ARG_REMOVED: 'ARG_REMOVED',
+  ARG_CHANGED_KIND: 'ARG_CHANGED_KIND',
+  DIRECTIVE_REMOVED: 'DIRECTIVE_REMOVED',
+  DIRECTIVE_ARG_REMOVED: 'DIRECTIVE_ARG_REMOVED',
+  REQUIRED_DIRECTIVE_ARG_ADDED: 'REQUIRED_DIRECTIVE_ARG_ADDED',
+  DIRECTIVE_REPEATABLE_REMOVED: 'DIRECTIVE_REPEATABLE_REMOVED',
+  DIRECTIVE_LOCATION_REMOVED: 'DIRECTIVE_LOCATION_REMOVED',
+});
+
+export const DangerousChangeType = Object.freeze({
+  VALUE_ADDED_TO_ENUM: 'VALUE_ADDED_TO_ENUM',
+  TYPE_ADDED_TO_UNION: 'TYPE_ADDED_TO_UNION',
+  OPTIONAL_INPUT_FIELD_ADDED: 'OPTIONAL_INPUT_FIELD_ADDED',
+  OPTIONAL_ARG_ADDED: 'OPTIONAL_ARG_ADDED',
+  IMPLEMENTED_INTERFACE_ADDED: 'IMPLEMENTED_INTERFACE_ADDED',
+  ARG_DEFAULT_VALUE_CHANGE: 'ARG_DEFAULT_VALUE_CHANGE',
+});
+
+export type BreakingChange = {|
+  type: $Keys<typeof BreakingChangeType>,
+  description: string,
+|};
+
+export type DangerousChange = {|
+  type: $Keys<typeof DangerousChangeType>,
+  description: string,
+|};
+
+/**
+ * Given two schemas, returns an Array containing descriptions of all the types
+ * of breaking changes covered by the other functions down below.
+ */
+export function findBreakingChanges(
+  oldSchema: GraphQLSchema,
+  newSchema: GraphQLSchema,
+): Array<BreakingChange> {
+  const breakingChanges = findSchemaChanges(oldSchema, newSchema).filter(
+    (change) => change.type in BreakingChangeType,
+  );
+  return ((breakingChanges: any): Array<BreakingChange>);
+}
+
+/**
+ * Given two schemas, returns an Array containing descriptions of all the types
+ * of potentially dangerous changes covered by the other functions down below.
+ */
+export function findDangerousChanges(
+  oldSchema: GraphQLSchema,
+  newSchema: GraphQLSchema,
+): Array<DangerousChange> {
+  const dangerousChanges = findSchemaChanges(oldSchema, newSchema).filter(
+    (change) => change.type in DangerousChangeType,
+  );
+  return ((dangerousChanges: any): Array<DangerousChange>);
+}
+
+function findSchemaChanges(
+  oldSchema: GraphQLSchema,
+  newSchema: GraphQLSchema,
+): Array<BreakingChange | DangerousChange> {
+  return [
+    ...findTypeChanges(oldSchema, newSchema),
+    ...findDirectiveChanges(oldSchema, newSchema),
+  ];
+}
+
+function findDirectiveChanges(
+  oldSchema: GraphQLSchema,
+  newSchema: GraphQLSchema,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+
+  const directivesDiff = diff(
+    oldSchema.getDirectives(),
+    newSchema.getDirectives(),
+  );
+
+  for (const oldDirective of directivesDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.DIRECTIVE_REMOVED,
+      description: `${oldDirective.name} was removed.`,
+    });
+  }
+
+  for (const [oldDirective, newDirective] of directivesDiff.persisted) {
+    const argsDiff = diff(oldDirective.args, newDirective.args);
+
+    for (const newArg of argsDiff.added) {
+      if (isRequiredArgument(newArg)) {
+        schemaChanges.push({
+          type: BreakingChangeType.REQUIRED_DIRECTIVE_ARG_ADDED,
+          description: `A required arg ${newArg.name} on directive ${oldDirective.name} was added.`,
+        });
+      }
+    }
+
+    for (const oldArg of argsDiff.removed) {
+      schemaChanges.push({
+        type: BreakingChangeType.DIRECTIVE_ARG_REMOVED,
+        description: `${oldArg.name} was removed from ${oldDirective.name}.`,
+      });
+    }
+
+    if (oldDirective.isRepeatable && !newDirective.isRepeatable) {
+      schemaChanges.push({
+        type: BreakingChangeType.DIRECTIVE_REPEATABLE_REMOVED,
+        description: `Repeatable flag was removed from ${oldDirective.name}.`,
+      });
+    }
+
+    for (const location of oldDirective.locations) {
+      if (newDirective.locations.indexOf(location) === -1) {
+        schemaChanges.push({
+          type: BreakingChangeType.DIRECTIVE_LOCATION_REMOVED,
+          description: `${location} was removed from ${oldDirective.name}.`,
+        });
+      }
+    }
+  }
+
+  return schemaChanges;
+}
+
+function findTypeChanges(
+  oldSchema: GraphQLSchema,
+  newSchema: GraphQLSchema,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+
+  const typesDiff = diff(
+    objectValues(oldSchema.getTypeMap()),
+    objectValues(newSchema.getTypeMap()),
+  );
+
+  for (const oldType of typesDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.TYPE_REMOVED,
+      description: isSpecifiedScalarType(oldType)
+        ? `Standard scalar ${oldType.name} was removed because it is not referenced anymore.`
+        : `${oldType.name} was removed.`,
+    });
+  }
+
+  for (const [oldType, newType] of typesDiff.persisted) {
+    if (isEnumType(oldType) && isEnumType(newType)) {
+      schemaChanges.push(...findEnumTypeChanges(oldType, newType));
+    } else if (isUnionType(oldType) && isUnionType(newType)) {
+      schemaChanges.push(...findUnionTypeChanges(oldType, newType));
+    } else if (isInputObjectType(oldType) && isInputObjectType(newType)) {
+      schemaChanges.push(...findInputObjectTypeChanges(oldType, newType));
+    } else if (isObjectType(oldType) && isObjectType(newType)) {
+      schemaChanges.push(
+        ...findFieldChanges(oldType, newType),
+        ...findImplementedInterfacesChanges(oldType, newType),
+      );
+    } else if (isInterfaceType(oldType) && isInterfaceType(newType)) {
+      schemaChanges.push(
+        ...findFieldChanges(oldType, newType),
+        ...findImplementedInterfacesChanges(oldType, newType),
+      );
+    } else if (oldType.constructor !== newType.constructor) {
+      schemaChanges.push({
+        type: BreakingChangeType.TYPE_CHANGED_KIND,
+        description:
+          `${oldType.name} changed from ` +
+          `${typeKindName(oldType)} to ${typeKindName(newType)}.`,
+      });
+    }
+  }
+
+  return schemaChanges;
+}
+
+function findInputObjectTypeChanges(
+  oldType: GraphQLInputObjectType,
+  newType: GraphQLInputObjectType,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+  const fieldsDiff = diff(
+    objectValues(oldType.getFields()),
+    objectValues(newType.getFields()),
+  );
+
+  for (const newField of fieldsDiff.added) {
+    if (isRequiredInputField(newField)) {
+      schemaChanges.push({
+        type: BreakingChangeType.REQUIRED_INPUT_FIELD_ADDED,
+        description: `A required field ${newField.name} on input type ${oldType.name} was added.`,
+      });
+    } else {
+      schemaChanges.push({
+        type: DangerousChangeType.OPTIONAL_INPUT_FIELD_ADDED,
+        description: `An optional field ${newField.name} on input type ${oldType.name} was added.`,
+      });
+    }
+  }
+
+  for (const oldField of fieldsDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.FIELD_REMOVED,
+      description: `${oldType.name}.${oldField.name} was removed.`,
+    });
+  }
+
+  for (const [oldField, newField] of fieldsDiff.persisted) {
+    const isSafe = isChangeSafeForInputObjectFieldOrFieldArg(
+      oldField.type,
+      newField.type,
+    );
+    if (!isSafe) {
+      schemaChanges.push({
+        type: BreakingChangeType.FIELD_CHANGED_KIND,
+        description:
+          `${oldType.name}.${oldField.name} changed type from ` +
+          `${String(oldField.type)} to ${String(newField.type)}.`,
+      });
+    }
+  }
+
+  return schemaChanges;
+}
+
+function findUnionTypeChanges(
+  oldType: GraphQLUnionType,
+  newType: GraphQLUnionType,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+  const possibleTypesDiff = diff(oldType.getTypes(), newType.getTypes());
+
+  for (const newPossibleType of possibleTypesDiff.added) {
+    schemaChanges.push({
+      type: DangerousChangeType.TYPE_ADDED_TO_UNION,
+      description: `${newPossibleType.name} was added to union type ${oldType.name}.`,
+    });
+  }
+
+  for (const oldPossibleType of possibleTypesDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.TYPE_REMOVED_FROM_UNION,
+      description: `${oldPossibleType.name} was removed from union type ${oldType.name}.`,
+    });
+  }
+
+  return schemaChanges;
+}
+
+function findEnumTypeChanges(
+  oldType: GraphQLEnumType,
+  newType: GraphQLEnumType,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+  const valuesDiff = diff(oldType.getValues(), newType.getValues());
+
+  for (const newValue of valuesDiff.added) {
+    schemaChanges.push({
+      type: DangerousChangeType.VALUE_ADDED_TO_ENUM,
+      description: `${newValue.name} was added to enum type ${oldType.name}.`,
+    });
+  }
+
+  for (const oldValue of valuesDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.VALUE_REMOVED_FROM_ENUM,
+      description: `${oldValue.name} was removed from enum type ${oldType.name}.`,
+    });
+  }
+
+  return schemaChanges;
+}
+
+function findImplementedInterfacesChanges(
+  oldType: GraphQLObjectType | GraphQLInterfaceType,
+  newType: GraphQLObjectType | GraphQLInterfaceType,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+  const interfacesDiff = diff(oldType.getInterfaces(), newType.getInterfaces());
+
+  for (const newInterface of interfacesDiff.added) {
+    schemaChanges.push({
+      type: DangerousChangeType.IMPLEMENTED_INTERFACE_ADDED,
+      description: `${newInterface.name} added to interfaces implemented by ${oldType.name}.`,
+    });
+  }
+
+  for (const oldInterface of interfacesDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.IMPLEMENTED_INTERFACE_REMOVED,
+      description: `${oldType.name} no longer implements interface ${oldInterface.name}.`,
+    });
+  }
+
+  return schemaChanges;
+}
+
+function findFieldChanges(
+  oldType: GraphQLObjectType | GraphQLInterfaceType,
+  newType: GraphQLObjectType | GraphQLInterfaceType,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+  const fieldsDiff = diff(
+    objectValues(oldType.getFields()),
+    objectValues(newType.getFields()),
+  );
+
+  for (const oldField of fieldsDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.FIELD_REMOVED,
+      description: `${oldType.name}.${oldField.name} was removed.`,
+    });
+  }
+
+  for (const [oldField, newField] of fieldsDiff.persisted) {
+    schemaChanges.push(...findArgChanges(oldType, oldField, newField));
+
+    const isSafe = isChangeSafeForObjectOrInterfaceField(
+      oldField.type,
+      newField.type,
+    );
+    if (!isSafe) {
+      schemaChanges.push({
+        type: BreakingChangeType.FIELD_CHANGED_KIND,
+        description:
+          `${oldType.name}.${oldField.name} changed type from ` +
+          `${String(oldField.type)} to ${String(newField.type)}.`,
+      });
+    }
+  }
+
+  return schemaChanges;
+}
+
+function findArgChanges(
+  oldType: GraphQLObjectType | GraphQLInterfaceType,
+  oldField: GraphQLField<mixed, mixed>,
+  newField: GraphQLField<mixed, mixed>,
+): Array<BreakingChange | DangerousChange> {
+  const schemaChanges = [];
+  const argsDiff = diff(oldField.args, newField.args);
+
+  for (const oldArg of argsDiff.removed) {
+    schemaChanges.push({
+      type: BreakingChangeType.ARG_REMOVED,
+      description: `${oldType.name}.${oldField.name} arg ${oldArg.name} was removed.`,
+    });
+  }
+
+  for (const [oldArg, newArg] of argsDiff.persisted) {
+    const isSafe = isChangeSafeForInputObjectFieldOrFieldArg(
+      oldArg.type,
+      newArg.type,
+    );
+    if (!isSafe) {
+      schemaChanges.push({
+        type: BreakingChangeType.ARG_CHANGED_KIND,
+        description:
+          `${oldType.name}.${oldField.name} arg ${oldArg.name} has changed type from ` +
+          `${String(oldArg.type)} to ${String(newArg.type)}.`,
+      });
+    } else if (oldArg.defaultValue !== undefined) {
+      if (newArg.defaultValue === undefined) {
+        schemaChanges.push({
+          type: DangerousChangeType.ARG_DEFAULT_VALUE_CHANGE,
+          description: `${oldType.name}.${oldField.name} arg ${oldArg.name} defaultValue was removed.`,
+        });
+      } else {
+        // Since we looking only for client's observable changes we should
+        // compare default values in the same representation as they are
+        // represented inside introspection.
+        const oldValueStr = stringifyValue(oldArg.defaultValue, oldArg.type);
+        const newValueStr = stringifyValue(newArg.defaultValue, newArg.type);
+
+        if (oldValueStr !== newValueStr) {
+          schemaChanges.push({
+            type: DangerousChangeType.ARG_DEFAULT_VALUE_CHANGE,
+            description: `${oldType.name}.${oldField.name} arg ${oldArg.name} has changed defaultValue from ${oldValueStr} to ${newValueStr}.`,
+          });
+        }
+      }
+    }
+  }
+
+  for (const newArg of argsDiff.added) {
+    if (isRequiredArgument(newArg)) {
+      schemaChanges.push({
+        type: BreakingChangeType.REQUIRED_ARG_ADDED,
+        description: `A required arg ${newArg.name} on ${oldType.name}.${oldField.name} was added.`,
+      });
+    } else {
+      schemaChanges.push({
+        type: DangerousChangeType.OPTIONAL_ARG_ADDED,
+        description: `An optional arg ${newArg.name} on ${oldType.name}.${oldField.name} was added.`,
+      });
+    }
+  }
+
+  return schemaChanges;
+}
+
+function isChangeSafeForObjectOrInterfaceField(
+  oldType: GraphQLType,
+  newType: GraphQLType,
+): boolean {
+  if (isListType(oldType)) {
+    return (
+      // if they're both lists, make sure the underlying types are compatible
+      (isListType(newType) &&
+        isChangeSafeForObjectOrInterfaceField(
+          oldType.ofType,
+          newType.ofType,
+        )) ||
+      // moving from nullable to non-null of the same underlying type is safe
+      (isNonNullType(newType) &&
+        isChangeSafeForObjectOrInterfaceField(oldType, newType.ofType))
+    );
+  }
+
+  if (isNonNullType(oldType)) {
+    // if they're both non-null, make sure the underlying types are compatible
+    return (
+      isNonNullType(newType) &&
+      isChangeSafeForObjectOrInterfaceField(oldType.ofType, newType.ofType)
+    );
+  }
+
+  return (
+    // if they're both named types, see if their names are equivalent
+    (isNamedType(newType) && oldType.name === newType.name) ||
+    // moving from nullable to non-null of the same underlying type is safe
+    (isNonNullType(newType) &&
+      isChangeSafeForObjectOrInterfaceField(oldType, newType.ofType))
+  );
+}
+
+function isChangeSafeForInputObjectFieldOrFieldArg(
+  oldType: GraphQLType,
+  newType: GraphQLType,
+): boolean {
+  if (isListType(oldType)) {
+    // if they're both lists, make sure the underlying types are compatible
+    return (
+      isListType(newType) &&
+      isChangeSafeForInputObjectFieldOrFieldArg(oldType.ofType, newType.ofType)
+    );
+  }
+
+  if (isNonNullType(oldType)) {
+    return (
+      // if they're both non-null, make sure the underlying types are
+      // compatible
+      (isNonNullType(newType) &&
+        isChangeSafeForInputObjectFieldOrFieldArg(
+          oldType.ofType,
+          newType.ofType,
+        )) ||
+      // moving from non-null to nullable of the same underlying type is safe
+      (!isNonNullType(newType) &&
+        isChangeSafeForInputObjectFieldOrFieldArg(oldType.ofType, newType))
+    );
+  }
+
+  // if they're both named types, see if their names are equivalent
+  return isNamedType(newType) && oldType.name === newType.name;
+}
+
+function typeKindName(type: GraphQLNamedType): string {
+  if (isScalarType(type)) {
+    return 'a Scalar type';
+  }
+  if (isObjectType(type)) {
+    return 'an Object type';
+  }
+  if (isInterfaceType(type)) {
+    return 'an Interface type';
+  }
+  if (isUnionType(type)) {
+    return 'a Union type';
+  }
+  if (isEnumType(type)) {
+    return 'an Enum type';
+  }
+  // istanbul ignore else (See: 'https://github.com/graphql/graphql-js/issues/2618')
+  if (isInputObjectType(type)) {
+    return 'an Input type';
+  }
+
+  // istanbul ignore next (Not reachable. All possible named types have been considered)
+  invariant(false, 'Unexpected type: ' + inspect((type: empty)));
+}
+
+function stringifyValue(value: mixed, type: GraphQLInputType): string {
+  const ast = astFromValue(value, type);
+  invariant(ast != null);
+
+  const sortedAST = visit(ast, {
+    ObjectValue(objectNode) {
+      // Make a copy since sort mutates array
+      const fields = [...objectNode.fields];
+
+      fields.sort((fieldA, fieldB) =>
+        naturalCompare(fieldA.name.value, fieldB.name.value),
+      );
+      return { ...objectNode, fields };
+    },
+  });
+
+  return print(sortedAST);
+}
+
+function diff<T: { name: string, ... }>(
+  oldArray: $ReadOnlyArray<T>,
+  newArray: $ReadOnlyArray<T>,
+): {|
+  added: Array<T>,
+  removed: Array<T>,
+  persisted: Array<[T, T]>,
+|} {
+  const added = [];
+  const removed = [];
+  const persisted = [];
+
+  const oldMap = keyMap(oldArray, ({ name }) => name);
+  const newMap = keyMap(newArray, ({ name }) => name);
+
+  for (const oldItem of oldArray) {
+    const newItem = newMap[oldItem.name];
+    if (newItem === undefined) {
+      removed.push(oldItem);
+    } else {
+      persisted.push([oldItem, newItem]);
+    }
+  }
+
+  for (const newItem of newArray) {
+    if (oldMap[newItem.name] === undefined) {
+      added.push(newItem);
+    }
+  }
+
+  return { added, persisted, removed };
+}