How to extract common devDependencies from each package to root package.json file? - monorepo

Question

I had imported two existing projects to monorepo using lerna import <PATH_OF_PROJECT> command.
Each project has a package.json file, they have some common devDependencies:
packages/redux-saga-examples/package.json:
"devDependencies": {
"#testing-library/react": "^12.0.0",
"#types/jest": "^26.0.24",
"#types/redux-actions": "^2.6.2",
"jest": "^27.0.6",
"ts-jest": "^27.0.4",
"ts-node": "^9.1.1",
"typescript": "^4.3.5"
}
packages/redux-toolkit-example/package.json:
"devDependencies": {
"#redux-saga/testing-utils": "^1.1.3",
"#types/jest": "^26.0.23",
"#types/redux-mock-store": "^1.0.2",
"jest": "^27.0.4",
"prettier": "^2.3.1",
"redux-mock-store": "^1.5.4",
"redux-saga-test-plan": "^4.0.1",
"ts-jest": "^27.0.3",
"ts-node": "^10.0.0",
"typescript": "^4.3.4"
}
redux-examples/package.json:
{
"name": "root",
"private": true,
"scripts": {
"bootstrap": "lerna bootstrap --hoist",
"test": "jest"
},
"devDependencies": {
"lerna": "^4.0.0"
}
}
Now I want to extract the common devDependencies such as typescript, jest, #types/jest to the devDependencies of the monorepo root package.json. I have tried lerna bootstrap --hoist, the devDependencies are still there in each package.
Is there any command that lerna provides to do this? Expect the package.json of root:
{
"name": "root",
"private": true,
"scripts": {
"bootstrap": "lerna bootstrap --hoist",
"test": "jest"
},
"devDependencies": {
"#types/jest": "^26.0.24",
"lerna": "^4.0.0",
"jest": "^27.0.6",
"ts-jest": "^27.0.4",
"ts-node": "^9.1.1",
"typescript": "^4.3.5"
}
}
And package.json file of each package:
packages/redux-saga-examples/package.json:
"devDependencies": {
"#testing-library/react": "^12.0.0",
"#types/redux-actions": "^2.6.2"
}
packages/redux-toolkit-example/package.json:
"devDependencies": {
"#redux-saga/testing-utils": "^1.1.3",
"#types/redux-mock-store": "^1.0.2",
"prettier": "^2.3.1",
"redux-mock-store": "^1.5.4",
"redux-saga-test-plan": "^4.0.1"
}

Answer 1

I don't think if this is still an open question but you can use a command given by lerna
lerna link connect
This command will segregate dev dependencies from all the packages and put it on the root.