css - How to add global style to angular 6/7 library

Question

I was trying to add global styles in the same way like in angular app, but it totally does not work.

My libraries' name is example-lib, so I added styles.css to /projects/example-lib/. I added styles in main angular.json file:

...
"example-lib": {
  "root": "projects/example-lib",
  "sourceRoot": "projects/example-lib/src",
  "projectType": "library",
  "prefix": "ngx",
  "architect": {
    "build": {
      "builder": "@angular-devkit/build-ng-packagr:build",
      "options": {
        "tsConfig": "projects/example-lib/tsconfig.lib.json",
        "project": "projects/example-lib/ng-package.json",
        "styles": [
          "projects/example-lib/styles.css" <!-- HERE 
        ],
      },
...

but when I tried build library using command:

ng build example-lib

I got error:

Schema validation failed with the following errors:
  Data path "" should NOT have additional properties(styles)

I guess that is the other way to add global styles in separate library. Anyone can help me?

question from:https://stackoverflow.com/questions/53377419/how-to-add-global-style-to-angular-6-7-library