fork-ts-checker-webpack-plugin: Cannot read property 'length' of undefined error

Current behavior

After installing fork-ts-checker-webpack-plugin builds start failing, we get a runtime error:

ERROR in [internal] INTERNAL ERROR: Cannot read property ‘length’ of undefined stack trace: TypeError: Cannot read property ‘length’ of undefined at unescapeLeadingUnderscores

stack trace:
TypeError: Cannot read property 'length' of undefined
    at unescapeLeadingUnderscores (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:13568:19)
    at Object.idText (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:13572:16)
    at typeToTypeNodeHelper (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35285:57)
    at addPropertyToElementList (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35679:59)
    at createTypeNodesFromResolvedType (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35629:25)
    at createTypeNodeFromObjectType (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35459:35)
    at createAnonymousTypeNode (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35411:42)
    at typeToTypeNodeHelper (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35319:28)
    at C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35113:106
    at withContext (C:\Users\mforman\Development\Specs\node_modules\typescript\lib\typescript.js:35154:37)

Expected behavior

Successful build

Steps to reproduce the issue

On webpack.config.js:

const ForkTsCheckerWebpackPlugin = require(‘fork-ts-checker-webpack-plugin’) plugins: [ //other code new ForkTsCheckerWebpackPlugin(), ],

then - npm run build results the above error.

Environment

• fork-ts-checker-webpack-plugin: 1.4.0
• typescript: 3.6.3
• tslint: N/A
• webpack: 4.39.3
• os: all