fork-ts-checker-webpack-plugin: Type changes to symlinked module files in a monorepo are not updated after the initial launch

Current behavior

Within a monorepo workspace with symlinked packages, changes to files in the symlinked modules are detected, however the types are not dynamically updated during a dev server session.

For example, the following code compiles correctly after the initial launch of webpack.

// original code somewhere in symlinked workspace package
export class Foo {
    bar() { return "bar" }
}

let foo = new Foo()
console.log(foo.bar())


// original code somewhere in main workspace

import { Foo } from 'monorepo-package'
new Foo().bar() // this works!

However incremental changes like the ones below will break.

// updated code somewhere in symlinked workspace package
export class Foo {
    bar() { return "bar" }
    baz() { return "baz" }
}

let foo = new Foo()
console.log(foo.bar())
console.log(foo.baz()) // this works! no errors!


// updated code somewhere in main workspace

import { Foo } from 'monorepo-package'
new Foo().bar() // this works!
new Foo().baz() // this fails! 'baz' is not detected as a new member function

Expected behavior

Changes to types should be updated dynamically across package boundaries in a monorepo.

Steps to reproduce the issue

See the above example.

Issue reproduction repository

N/A… code above might be enough for a repro.

Environment

• fork-ts-checker-webpack-plugin: v6.0.alpha (latest master does not detect symlinks changes at all)
• typescript: v4.1.3
• eslint: v4.19.1
• webpack: v4.44.1
• os: Mac OS 10.14.6