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config:
module.exports = {
  preset: "ts-jest",
  testEnvironment: "jsdom",
  globals: {
    "ts-jest": {
      tsconfig: "tsconfig.json",
    },
  },
  setupFilesAfterEnv: ["@testing-library/jest-dom/extend-expect"],
};

error:
● Validation Error:

  Module @testing-library/jest-dom/extend-expect in the setupFilesAfterEnv option was not found.
         <rootDir> is: /Users/bryan/Code/blue/reflection-app-affiliate-web

  Configuration Documentation:
  https://jestjs.io/docs/configuration