Jest tests fail after adding Typescript to a React Native project

So, I just added TypeScript to an existing React Native project (first commit dates from Feb 2016), and I'm getting the follwing errors when running unit tests (using Jest):

1. This is the one that is showing in most files, I'd say 30 out of 38 failed tests

2. This one already has a mock in the mock files

3. This one shows up on two files

4. This one shows up on just one file

This only happens when adding ts, I've only modified three files from the project to use it as I have to go slowly because it's a huge project.

I've tried out with different setups for jest.config.js but nothing changes:

jest.config.js

const { defaults: tsjPreset } = require('ts-jest/presets');module.exports = {    ...tsjPreset,    globals: {'ts-jest': {            babelConfig: true,        }    },    moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],    modulePaths: ['<rootDir>'],    preset: 'react-native',    transform: {        ...tsjPreset.transform,'^.+\\.(js)$': '<rootDir>/node_modules/babel-jest','^.+\\.(ts|tsx)?$': '<rootDir>/node_modules/ts-jest/preprocessor.js',    },    transformIgnorePatterns: ['node_modules/(?!(texts/@debitoor/react-native-sunstone/))/'],};

tsconfig.json

{"compilerOptions": {"allowJs": true,"allowSyntheticDefaultImports": true,"baseUrl": "./app","esModuleInterop": true,"isolatedModules": true,"jsx": "react","lib": ["es2017"],"moduleResolution": "node","noEmit": true,"paths": {"common": ["./common"]        },"skipLibCheck": true,"strict": false,"target": "esnext"    },"exclude": ["node_modules","babel.config.js","metro.config.js","jest.config.js"    ]}

I tried removing the exclude elements at same thing happens. Not sure what else I'm missing.

I also tried using ts-jest but nothing changed either.

This is the tsconfig.jest.json file:

{"extends": "./tsconfig","compilerOptions": {"jsx": "react","module": "commonjs"    }}

I've searched around and in most articles/sites they always talk about starting fresh, but I've already got everything else setup and can't really change much without taking too much time.

Any ideas would be great!