什么是ts-node-dev,Compiles your TS app and restarts when files are modified.



Tweaked version of node-dev that uses ts-node under the hood.

It restarts target node process when any of required files changes (as standard node-dev) but shares Typescript compilation process between restarts. This significantly increases speed of restarting comparing to node-dev -r ts-node/register ..., nodemon -x ts-node ... variations because there is no need to instantiate ts-node compilation each time.


yarn add ts-node-dev --dev
npm i ts-node-dev --save-dev

ts-node dependency version is not fixed, so it will install the latest version by default.


ts-node-dev [node-dev|ts-node flags] [ts-node-dev flags] [node cli flags] [--] [script] [script arguments]

So you just combine node-dev and ts-node options (see docs of those packages):

ts-node-dev --respawn --transpileOnly server.ts

There is also short alias tsnd for running ts-node-dev:

tsnd --respawn server.ts

Also there are additional options specific to ts-node-dev:

  • --prefer-ts (default: false) - for each .js file (that is not in node_modules) will try to check if corresponding .ts version exists and require it.

  • --ignore-watch (default: []) - files/folders to be ignored by node-dev. But also this behaviour enhanced: it will also make up new RegExp of passed ignore string and check absolute paths of required files for match. So, to ignore everything in node_modules, just pass --ignore-watch node_modules.

  • --debug - Some additional debug output.

  • --interval - Polling interval (ms)

  • --debounce - Debounce file change events (ms, non-polling mode)

  • --clear (--cls) Will clear screen on restart

  • --watch - Explicitly add files or folders to watch and restart on change (list separated by commas)

  • --exit-child - Adds 'SIGTERM' exit handler in a child process.

Caveats and points of notice:

  • Especially for large code bases always consider running with --transpile-only flag which is normal for dev workflow and will speed up things greatly. Note, that ts-node-dev will not put watch handlers on TS files that contain only types/interfaces (used only for type checking) - this is current limitation by design.

  • --ignore-watch will NOT affect files ignored by TS compilation. Use --ignore option (or TS_NODE_IGNORE env variable) to pass RegExp strings for filtering files that should not be compiled, by default /node_modules/ are ignored.

  • Unknown flags (node cli flags are considered to be so) are treated like string value flags by default. The right solution to avoid ambiguity is to separate script name from option flags with --, for example:

    ts-node-dev --inspect -- my-script.ts
  • The good thing is that ts-node-dev watches used tsconfig.json file, and will reinitialize compilation on its change, but you have to restart the process manually when you update used version of typescript or make any other changes that may effect compilation results.



上一篇:@babel/preset-env 与@babel/plugin-transform-runtime 使用及场景区别


扫描下方二维码回复 1024 获取验证码,验证完毕后 永久 无须验证

操作步骤:[打开微信]->[扫描上侧二维码]->[关注 FedJavaScript 的微信] 输入 1024 获取验证码