Is TSC_WATCH utilizing the TSC_NONPOLLING_WATCHER?

Currently, I am engaged in a microservice integration project where I simultaneously run 8 typescript services using the command 

tsc-watch --preserveWatchOutput --onSuccess 'node build/index.js'
.

Surprisingly, these processes are utilizing 70% of my CPU power even when no changes are being made to the source code. After some research, I discovered that there might be continuous polling for changes happening in the background. In an attempt to stop this unnecessary polling, I tried setting the environment variable TSC_NONPOLLING_WATCHER to "1" based on a helpful hint found at: https://medium.com/@julioromano/writing-typescript-on-a-laptop-this-might-improve-your-battery-life-f503dd16f019

Unfortunately, this adjustment did not seem to have any effect. Moreover, the author mentioned using "tsc -w" instead of tsc-watch, leading me to question the difference between tsc -w and tsc-watch.

If anyone could provide further insight or assistance regarding this matter, I would greatly appreciate it.

typescriptwatch

Answer №1

Update 1 no changes needed in tsconfig.json

I encountered a similar issue and plan to resolve it by correctly setting the environment variable 

TSC_NONPOLLING_WATCHER="1"
.

In my situation, I had to modify .zprofile by adding:

export TSC_NONPOLLING_WATCHER="1"

You can verify it in a command prompt using echo $TSC_NONPOLLING_WATCHER.

Alternative Approach

If this solution does not work, try adjusting the tsconfig.json files as shown below:

"watchOptions": {
    // Use native file system events for files and directories
    "watchFile": "useFsEvents",
    "watchDirectory": "useFsEvents",

    // Poll files for updates more frequently
    // when they're updated frequently.
    "fallbackPolling": "dynamicPriority"
}

These guidelines are sourced from: https://www.typescriptlang.org/docs/handbook/configuring-watch.html and it is recommended to review them before making any modifications.

tsc vs tsc-watch

Regarding the distinction between tsc -w and tsc-watch, the project on GitHub states:

  • tsc-watch utilizes the current TypeScript compiler that is installed.
  • tsc-watch does not alter the compiler but simply adds new arguments, resulting in identical compilation, while all other arguments remain unchanged.

Hence, any configurations set for tsc should function similarly in tsc-watch within your particular scenario.

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