add config to BuildContext type and corresponding mock data

Author: lobsterkatie

packages/nextjs/src/config/types.ts

@@ -43,7 +43,13 @@ export type WebpackConfigObject = {
 };
 
 // Information about the current build environment
-export type BuildContext = { dev: boolean; isServer: boolean; buildId: string; dir: string };
+export type BuildContext = {
+  dev: boolean;
+  isServer: boolean;
+  buildId: string;
+  dir: string;
+  config: Partial<NextConfigObject>;
+};
 
 /**
  * Webpack `entry` config

packages/nextjs/test/config.test.ts

@@ -80,10 +80,12 @@ const clientWebpackConfig = {
   target: 'web',
   context: '/Users/Maisey/projects/squirrelChasingSimulator',
 };
+
 const baseBuildContext = {
   dev: false,
   buildId: 'doGsaREgReaT',
   dir: '/Users/Maisey/projects/squirrelChasingSimulator',
+  config: { target: 'server' as const },
 };
 const serverBuildContext = { isServer: true, ...baseBuildContext };
 const clientBuildContext = { isServer: false, ...baseBuildContext };