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Watch mode is failing

See original GitHub issue

Describe the issue The watch mode on Elyra fails to pick up code changes

To Reproduce Steps to reproduce the behavior:

build from master with make clean install
run make watch
On another terminal, run jupyter lab --watch
make any change to one of the ts files and save it
check the terminal running make watch for file change detection msg and make sure there are no compilation errors
reload jupyterlab page and try to access your code change
The page doesn’t pick up the changes (eg. inspecting the file still shows the original code version)
Check for errors on the serverapp

Screenshots or log output

Error log

/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/@jupyterlab/builder/lib/webpack-plugins.js:93
                    const dirTimestamps = watcher.getContextInfoEntries();
                                                  ^
TypeError: watcher.getContextInfoEntries is not a function
    at Object.getContextTimeInfoEntries (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/@jupyterlab/builder/lib/webpack-plugins.js:93:51)
    at run (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/Watching.js:94:48)
    at /Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/Watching.js:75:6
    at /Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/HookWebpackError.js:69:3
    at Hook.eval [as callAsync] (eval at create (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:6:1)
    at Hook.CALL_ASYNC_DELEGATE [as _callAsync] (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/node_modules/tapable/lib/Hook.js:18:14)
    at Cache.endIdle (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/Cache.js:140:22)
    at run (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/Watching.js:72:32)
    at Watching._go (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/Watching.js:152:3)
    at Watching._invalidate (/Users/kspuldaro/miniconda3/envs/dev/share/jupyter/lab/staging/node_modules/webpack/lib/Watching.js:320:9)
error Command failed with exit code 1.

Expected behavior When running jupyterlab in watch mode, it should pick up code changes on page reload