Config changes not being picked up when running test coverage with Jest - jestjs

Question

I am looking for a way to exclude entire folders/files from my testing coverage with Jest. I have gone through the official Jest documentations several times, but have been unable to get it to work. I've come to the conclusion that maybe my jest.config.js isn't being picked up, because no matter what changes I make to the collectCoverageFrom or testPathIgnorePatterns fields, the test coverage return does not change, and it includes everything, even the things I am trying to exclude. Here is my test coverage script in the package.json:
"test-coverage": "npm test --config='jest.config.js' --coverage "
and here is my jest.config.js:
module.exports = {
roots: ['<rootDir>', '<rootDir>/src', '<rootDir>/tests'],
testEnvironment: 'jsdom',
testPathIgnorePatterns: ['/node_modules/'],
collectCoverage: true,
collectCoverageFrom: ['./src/**/*.{js, jsx}', '!**/node_modules/**', '!**/vendor/**'],
coverageDirectory: './coverage',
}
For the files I am excluding, I am just using this format: !src/folder/file.js as per the official jest
documentation.
Any help appreciated.
Things I did to troubleshoot:
I added the path to the Jest config into the test-coverage command, but that was unsuccessful.
I have set the collectCoverage field above to true, no success.
I added the jest config to the actual package.json, but even that
did not change anything. Here is the format for it inside my
package.json:
"jest": {
"roots": ["<rootDir>", "<rootDir>/src","<rootDir>/tests"],
"testEnvironment": "jsdom",
"testPathIgnorePatterns": ["/node_modules/"],
"collectCoverage": true,
"collectCoverageFrom": ["./src/**/*.{js,jsx}","!**/node_modules/**","!**/vendor/**"],
"coverageDirectory": "./coverage"
}