Typescript projects definitely give me the most pain. You regularly end up to the point you have to resort to 'any' after hours of looking for a stupid type definition. IMAO it's just one big waste of time, just landed a job with a good old JS codebase, what a relief. TS might help for junior and medior developers so they make less mistakes. But I'm pretty sure if you can code Javascript well Typescript only stands in your way when you want to create something. Imagine you give a painter a brush that doesn't allow to be used freely, that's what TS does to a good JS developer.
But TS is at this moment really eating JS jobs, and that kinda hurts. I just don't understand the proponents, besides the job opportunity, give me one single reason to write in TS? If you want to go for a strictly typed language TS is definitely the worse choice. TS simply doesn't fit in the JS ecosystem. Look at (a part of) the dependency part of this package.json, from the beginning of a large project. Don't you agree something is going very wrong in the JS world?
"ts-jest": "^23.1.3",
"ts-loader": "^4.5.0",
"ts-node": "^7.0.1",
"tsconfig-paths-webpack-plugin": "^3.2.0",
"tslint": "^5.11.0",
"tslint-config-prettier": "^1.14.0",
"tslint-react": "^3.6.0",
"typescript": "^3.0.1",
"typings-for-css-modules-loader": "^1.7.0",
"@sentry/browser": "^4.0.0-beta.12",
"@sentry/node": "4.0.0-beta.12",
"@sentry/types": "^4.0.0-beta.12",
"@types/autoprefixer": "^6.7.3",
"@types/classnames": "^2.2.6",
"@types/clean-webpack-plugin": "^0.1.2",
"@types/compression": "0.0.36",
"@types/cookie-parser": "^1.4.1",
"@types/cors": "^2.8.4",
"@types/cucumber": "^4.0.4",
"@types/enzyme": "^3.1.13",
"@types/enzyme-adapter-react-16": "^1.0.3",
"@types/enzyme-to-json": "^1.5.2",
"@types/express": "^4.16.0",
"@types/helmet": "0.0.38",
"@types/html-webpack-plugin": "^3.2.0",
"@types/jest": "^23.3.1",
"@types/js-cookie": "^2.1.0",
"@types/memwatch-next": "^0.3.1",
"@types/node": "^10.5.7",
"@types/node-sass": "^3.10.32",
"@types/optimize-css-assets-webpack-plugin": "^1.3.3",
"@types/react": "^16.4.11",
"@types/react-dom": "^16.0.7",
"@types/react-helmet": "^5.0.7",
"@types/react-intl": "^2.3.10",
"@types/react-loadable": "^5.4.1",
"@types/react-redux": "^6.0.6",
"@types/react-router-dom": "^4.3.0",
"@types/redux-mock-store": "^1.0.0",
"@types/serve-favicon": "^2.2.30",
"@types/webdriverio": "^4.10.3",
"@types/webpack-merge": "^4.1.3",
"@types/webpack-node-externals": "^1.6.3",
"webpack": "4.19.0",
"webpack-assets-manifest": "^3.0.2",
"webpack-cli": "3.1.0",
"webpack-dev-middleware": "^3.1.3",
"webpack-dev-server": "^3.1.5",
"webpack-hot-middleware": "^2.22.3",
"webpack-merge": "^4.1.4",
"webpack-node-externals": "^1.7.2",
"stylelint": "^9.5.0",
"stylelint-config-prettier": "^4.0.0",
"stylelint-config-recess-order": "^2.0.0",
"stylelint-config-recommended-scss": "^3.2.0",
"stylelint-scss": "^3.3.0",