Support for --listEmittedFiles + new message file_emitted

[pp0rtal]

Summary: watch tsc generated files

I'm using the client and I would like to be notified everytime a new file is written.
This is possible with listEmittedFiles options which list the files emitted https://www.typescriptlang.org/tsconfig#listEmittedFiles

Why? Performance I'm using this lib client inside some compilation flow (there are some post-process after the Ts is compiled)

• Without: I need to watch the dist folder, which is resource consuming
• With listEmittedFiles I can unwatch the dist folder :)

RFC: listEmittedFiles support

• I suggest to activate this ability by an iso tsc-watch --listEmittedFiles new option
• tsc output will be parsed obviously
• we trigger a new message file_emitted with the absolute file path

FYI tsc output is trivial:

TSFILE: /home/portal/.../config/config.js
TSFILE: /home/portal/.../config/config.js.map
TSFILE: /home/portal/.../tsconfig.tsbuildinfo

Example of implementation:

tsWatch.start(...);
tsWatch.on("file_emitted", (emittedFile) => {
    console.log({ emittedFile });
});

Impact

no regression at all
(--listEmittedFiles has to be explicitely called)

ℹ️ Note I will do the PR

[gilamran]

Sounds good.
Maybe call the event file_emitted?

[gilamran]

published on version 4.6.2