Cypress coverage with typescript

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I've been trying to instrument coverage on a NextJS typescript project using Cypress v12, but the official docs seem to be for javascript an Cypress version < 10. I cannot seem to get anything back when I type window.__coverage__ or __coverage__ in the console and I was originally getting this error that code-coverage was not set up (because I haven't instrumented it):

Could not find any coverage information in your application
by looking at the window coverage object.
Did you forget to instrument your application?
See code-coverage#instrument-your-application
[@cypress/code-coverage]

I already have jest running with lcov and have been using that for my unit tests. Babel has also been installed before Cypress. The instrument-cra package won't work on a Next.js project

Consistent throughout several articles are that I need:

  1. babel installed and .babelrc configured
  2. cypress.config.ts modified
  3. nyc installed and possibly .nycrc.json configured OR @babel-plugin-instabul installed
  4. @cypress/code-coverage installed
  5. Some index/e2e files in /support edited

It looks like I may possibly need:

  1. An API imported and referenced

I've tried to instrument coverage in many ways on a dozen or so branches and they're blurring together for me (I'm using the example repos referenced in the cypress docs). Sometimes I seem to be able to make progress but then I get this error:

TypeError
invalid pattern

Because this error occurred during a after each hook we are skipping all of the remaining tests.
View stack trace
 Print to console
at assertValidPattern

I am also confused why and whether I need instrumentation on a project that jest is already in, and if I need to specifically use babel-plugin-istanbul over nyc which is built into jest, how does this work? Ot doesn't seem to be doing anything when I add it to my package.json and my .babelrc. What exactly do I need to do to get window.__coverage__ to return anything outside of installing these packages?

My package.json at the start of the project before adding packages:

{
  "name": "next",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "dev": "next dev",
    "build": "yarn build:version-config && next build && next export",
    "start": "next start",
    "start:e2e": "next start -p 3002",
    "start:dev:e2e": "next dev -p 8081",
    "lint": "next lint",
    "build:version-config": "npx ts-node scripts/build-version-config.ts",
    "iterable:sync": "npx ts-node scripts/sync-email-templates.ts",
    "cypress:open": "cypress open --env CYPRESS_ENV=dev,<company>BASE_URL=api.staging.<company>.com",
    "cypress:run": "cypress run --env <company>BASE_URL=api.staging.<company>.com",
    "cypress:contract": "cypress run --spec cypress/integration/dashboard.spec.js",
    "test": "yarn test:unit",
    "test:unit": "npx jest",
    "test:watch": "jest --watch",
    "test:ci:unit": "jest --silent --ci --runInBand",
    "apollo:sync": "yarn apollo:sync:remove && yarn apollo:sync:download && yarn apollo:sync:generate && yarn apollo:sync:format",
    "apollo:sync:format": "yarn prettier --write \"./types/generated/*.ts\" \"./graphql-schema.json\"",
    "apollo:sync:remove": "yarn rimraf --glob types/generated/*.ts",
    "apollo:sync:download": "yarn apollo service:download --endpoint=https://api.staging.<company>.com/graphql graphql-schema.json",
    "apollo:sync:generate": "yarn apollo codegen:generate --localSchemaFile=graphql-schema.json --target=typescript --tagName=gql --outputFlat=types/generated"
  },
  "dependencies": {
    "@apollo/client": "^3.5.10",
    "@cypress/code-coverage": "^3.9.12",
    "@datadog/browser-rum": "^4.20.0",
    "@emotion/cache": "^11.7.1",
    "@emotion/css": "^11.7.1",
    "@emotion/react": "^11.4.1",
    "@emotion/server": "^11.4.0",
    "@emotion/styled": "^11.3.0",
    "@faker-js/faker": "^7.6.0",
    "@optimizely/react-sdk": "^2.9.1",
    "@radix-ui/react-popover": "^0.1.4",
    "@styled-system/css": "^5.1.5",
    "@types/lodash": "^4.14.176",
    "@types/papaparse": "^5.3.2",
    "@types/react-table": "^7.7.7",
    "@types/recharts": "^1.8.24",
    "@types/redux-logger": "^3.0.9",
    "@types/styled-system": "^5.1.13"
    "chai": "^4.3.7",
    "check-code-coverage": "^1.10.4",
    "classnames": "^2.3.1",
    "currency.js": "^2.0.4",
    "cypress": "^12.9.0",
    "cypress-wait-until": "^1.7.2",
    "date-fns": "^2.25.0",
    "file-saver": "^2.0.5",
    "formik": "^2.2.9",
    "fuzzy-search": "^3.2.1",
    "graphql": "14.7.0",
    "handlebars": "^4.7.7",
    "handlebars-helpers": "^0.10.0",
    "highcharts": "^10.0.0",
    "highcharts-react-official": "^3.1.0",
    "immer": "^9.0.12",
    "lodash": "^4.17.21",
    "next": "11.1.2",
    "nyc": "^15.1.0",
    "papaparse": "^5.3.2",
    "phosphor-react": "^1.3.1",
    "react": "17.0.2",
    "react-big-calendar": "^1.6.9",
    "react-dom": "17.0.2",
    "react-router-dom": "^6.2.2",
    "react-table": "^7.7.0",
    "react-tiny-popover": "^7.0.1",
    "react-tracking": "^9.1.0",
    "recharts": "^2.4.3",
    "redux-logger": "^3.0.6",
    "redux-thunk": "^2.3.0",
    "reselect": "^4.1.5",
    "states-us": "^1.0.1",
    "styled-system": "^5.1.5",
    "swr": "^1.1.2",
    "uuid": "^9.0.0"
  },
  "devDependencies": {
    "@babel/core": "^7.17.5",
    "@testing-library/dom": "^8.11.3",
    "@testing-library/jest-dom": "^5.14.1",
    "@testing-library/react": "^12.1.0",
    "@testing-library/user-event": "^13.5.0",
    "@tsconfig/cypress": "^1.0.0",
    "@types/fuzzy-search": "^2.1.2",
    "@types/graphql": "^14.5.0",
    "@types/lodash": "^4.14.176",
    "@types/react": "17.0.22",
    "@types/react-big-calendar": "^1.6.3",
    "@types/react-table": "^7.7.7",
    "@types/react-tracking": "^8.1.2",
    "@types/redux-logger": "^3.0.9",
    "@types/styled-system": "^5.1.13",
    "@types/uuid": "^8.3.4",
    "@typescript-eslint/eslint-plugin": "^4.21.0",
    "@typescript-eslint/parser": "^4.21.0",
    "apollo": "^2.33.4",
    "babel-jest": "^27.2.1",
    "babel-plugin-istanbul": "^6.1.1",
    "eslint": "7.32.0",
    "eslint-config-airbnb": "^18.2.1",
    "eslint-config-next": "11.1.2",
    "eslint-config-prettier": "^8.1.0",
    "eslint-import-resolver-typescript": "^2.4.0",
    "eslint-plugin-cypress": "^2.10.3",
    "eslint-plugin-jest": "^24.3.4",
    "eslint-plugin-jsx-a11y": "^6.4.1",
    "eslint-plugin-lodash": "^7.4.0",
    "eslint-plugin-react": "^7.29.0",
    "eslint-plugin-react-hooks": "^4",
    "identity-obj-proxy": "^3.0.0",
    "install-peers": "^1.0.3",
    "jest": "^27.2.1",
    "jest-junit": "^15.0.0",
    "lint-staged": "^12.1.7",
    "msw": "^0.35.0",
    "next-router-mock": "^0.7.4",
    "prettier": "2.6.2",
    "resize-observer-polyfill": "^1.5.1",
    "tsc-files": "^1.1.3",
    "typed-css-modules": "^0.7.0",
    "typescript": "4.4.3",
    "whatwg-fetch": "^3.6.2"
  },
  "prettier": {
    "singleQuote": true,
    "trailingComma": "all"
  },
  "resolutions": {
    "graphql": "14.7.0"
  },
}

I also have import '@cypress/code-coverage/support' on e2e.ts and require('@cypress/code-coverage/task')(on, config); in my plugins/index.js although my plugins/index.js shouldn't be used as it's v12



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