message: Stop importing all of `fs`, opting instead to import only writeFileSync`.
diff: @@ -3,7 +3,7 @@ import "apollo-codegen-core/lib/polyfills";
  import { Command, flags } from "@oclif/command";
  import * as Listr from "listr";
  -import * as fs from "fs";
  +import { writeFileSync } from "fs";
  import {
  getCommonTasks,
  @@ -59,7 +59,7 @@ export default class ExtractQueries extends Command {
  task: async (ctx, task) => {
  const filename = args.output;
  task.title = "Outputing extracted queries to " + filename;
  - fs.writeFileSync(filename, JSON.stringify(ctx.mapping));
  + writeFileSync(filename, JSON.stringify(ctx.mapping));
  }
  }
  ]);
  