medium-editor.directive.ts is missing from the TypeScript compilation

[K-7]

Not able to use angular-medium-editor library in Angular 5

Packages installed are mentioned Below
"angular-medium-editor": "^4.0.0-alpha",
"angular/core": "^5.2.0",
"typescript": "~2.5.3"

During "ng serve" command I get the following error

ERROR in ./node_modules/angular-medium-editor/medium-editor.directive.ts
Module build failed: Error: /Users/K2A/GIT/traveldiary/webapp/node_modules/angular-medium-editor/medium-editor.directive.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property.
The missing file seems to be part of a third party library. TS files in published libraries are often a sign of a badly packaged library. Please open an issue in the library repository to alert its author and ask them to package the library using the Angular Package Format (https://goo.gl/jB3GVv).
at AngularCompilerPlugin.getCompiledFile (/Users/K2A/GIT/traveldiary/webapp/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:656:23)
at plugin.done.then (/Users/K2A/GIT/traveldiary/webapp/node_modules/@ngtools/webpack/src/loader.js:467:39)
at
at process._tickCallback (internal/process/next_tick.js:188:7)
@ ./src/app/pages/pages.module.ts 18:32-88
@ ./src/app/app.module.ts
@ ./src/main.ts
@ multi webpack-dev-server/client?http://0.0.0.0:0 ./src/main.ts

Kindly let me know is there is anything that I can do to fix this issue and use the library