Crashes when using `lintDirtyModulesOnly` and webpack 5.beta0

[thasmo]

Expected Behavior

Does not crash on successive webpack builds in watch mode.

Actual Behavior

Crashes on successive webpack builds in watch mode; not on the initial watch build tho.

Call Stack

TypeError: Cannot read property 'entries' of undefined
at LintDirtyModulesPlugin.getChangedFiles (C:\Users\user\Projects\project\node_modules\stylelint-webpack-plugin\dist\LintDirtyModulesPlugin.js:53:56)
at LintDirtyModulesPlugin.apply (C:\Users\user\Projects\project\node_modules\stylelint-webpack-plugin\dist\LintDirtyModulesPlugin.js:34:31)
at compiler.hooks.emit.tapAsync (C:\Users\user\Projects\project\node_modules\stylelint-webpack-plugin\dist\index.js:38:19)
at _next1 (eval at create (C:\Users\user\Projects\project\node_modules\webpack\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:56:1)
at _err1 (eval at create (C:\Users\user\Projects\project\node_modules\webpack\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:82:1)
at WebpackAssetsManifest.handleEmit (C:\Users\user\Projects\project\node_modules\webpack-assets-manifest\src\WebpackAssetsManifest.js:486:5)
at Hook.eval [as callAsync] (eval at create (C:\Users\user\Projects\project\node_modules\webpack\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:78:1)
at Compiler.emitAssets (C:\Users\user\Projects\project\node_modules\webpack\lib\Compiler.js:536:19)
at process.nextTick (C:\Users\user\Projects\project\node_modules\webpack\lib\Watching.js:75:21)
at process._tickCallback (internal/process/next_tick.js:61:11)

How Do We Reproduce?

Use webpack 5.beta0 and stylelint-webpack-plugin with the lintDirtyModulesOnly option enabled and run webpack in watch mode and after the initial build, change a file which should trigger a rebuild - this time the plugin will crash.

Environment

• OS: Windows 10
• Node: 10
• NPM: 6.11
• webpack: 5.beta0
• stylelint-webpack-plugin: 1.0.2

[vankop]

I will take a look on this

[sokra]

compilation.fileTimestamps has been removed in webpack 5.

see also https://github.com/webpack/changelog-v5#compilationfilesysteminfo