fix: remove flat polyfill, use Array.prototype.flat instead

CHANGELOG.md

@@ -19,7 +19,7 @@
 - `apollo-env`
   - <First `apollo-env` related entry goes here>
 - `apollo-graphql`
-  - <First `apollo-graphql` related entry goes here>
+  - remove flat polyfill, use Array.prototype.flat instead [PR #2449](https://github.com/apollographql/apollo-tooling/pull/2449)
 - `apollo-language-server`
   - <First `apollo-language-server` related entry goes here>
 - `apollo-tools`
@@ -33,7 +33,7 @@
 
 ## [email protected]
 
-- Adds support for àpollo.config.cjs`files allowing `package.json` files with `type: "module"` [Issue #2342](https://github.com/apollographql/apollo-tooling/issues/2342) [PR #2381](https://github.com/apollographql/apollo-tooling/pull/2381)
+- Adds support for àpollo.config.cjs`files allowing`package.json`files with`type: "module"` [Issue #2342](https://github.com/apollographql/apollo-tooling/issues/2342) [PR #2381](https://github.com/apollographql/apollo-tooling/pull/2381)
 
 ## [email protected]
 

packages/apollo-graphql/package.json

@@ -8,10 +8,9 @@
   "author": "Apollo <[email protected]>",
   "license": "MIT",
   "engines": {
-    "node": ">=6"
+    "node": ">=12"
   },
   "dependencies": {
-    "core-js-pure": "^3.10.2",
     "lodash.sortby": "^4.7.0",
     "sha.js": "^2.4.11"
   },

packages/apollo-graphql/src/schema/buildSchemaFromSDL.ts

@@ -26,11 +26,6 @@ import { GraphQLResolverMap } from "./resolverMap";
 import { GraphQLSchemaValidationError } from "./GraphQLSchemaValidationError";
 import { specifiedSDLRules } from "graphql/validation/specifiedRules";
 
-// TODO(Node.js 10): When we deprecate Node.js 10, remove this and switch
-// to using `Array.prototype.flat`.  When doing this, deleting the hand-rolled
-// types in `./packages/apollo-gateway/src/types/` that go with it.
-import flat from "core-js-pure/features/array/flat";
-
 import {
   KnownTypeNamesRule,
   UniqueDirectivesPerLocationRule,
@@ -162,7 +157,7 @@ export function buildSchemaFromSDL(
     {
       kind: Kind.DOCUMENT,
       definitions: [
-        ...flat(Object.values(definitionsMap)),
+        ...Object.values(definitionsMap).flat(),
         ...missingTypeDefinitions,
         ...directiveDefinitions
       ]
@@ -176,7 +171,7 @@ export function buildSchemaFromSDL(
     schema,
     {
       kind: Kind.DOCUMENT,
-      definitions: flat(Object.values(extensionsMap))
+      definitions: Object.values(extensionsMap).flat()
     },
     {
       assumeValidSDL: true
@@ -188,11 +183,10 @@ export function buildSchemaFromSDL(
   if (schemaDefinitions.length > 0 || schemaExtensions.length > 0) {
     operationTypeMap = {};
 
-    const operationTypes = flat(
-      [...schemaDefinitions, ...schemaExtensions]
-        .map(node => node.operationTypes)
-        .filter(isNotNullOrUndefined)
-    );
+    const operationTypes = [...schemaDefinitions, ...schemaExtensions]
+      .map(node => node.operationTypes)
+      .filter(isNotNullOrUndefined)
+      .flat();
 
     for (const { operation, type } of operationTypes) {
       operationTypeMap[operation] = type.name.value;