If you want to try this, you can run it on the Sample Database from www.postgresqltutorial.com.
I've created a Docker image that hosts it so if you have Docker installed, you can easily set up such a database locally by running
npm run start-example-db
First, run the build script in this folder with:
npm run build
Then, run the config file in this folder with:
npm run run-example
You should see output like this:
schema-lint
Connecting to dvdrental on localhost
public.address.address: error prefer-text-to-varchar : Prefer text to varchar types
public.address.address2: error prefer-text-to-varchar : Prefer text to varchar types
public.address.district: error prefer-text-to-varchar : Prefer text to varchar types
public.address.postal_code: error prefer-text-to-varchar : Prefer text to varchar types
public.address.phone: error prefer-text-to-varchar : Prefer text to varchar types
public.category.name: error prefer-text-to-varchar : Prefer text to varchar types
public.country.country: error prefer-text-to-varchar : Prefer text to varchar types
public.customer.first_name: error prefer-text-to-varchar : Prefer text to varchar types
public.customer.last_name: error prefer-text-to-varchar : Prefer text to varchar types
public.customer.email: error prefer-text-to-varchar : Prefer text to varchar types
public.film.title: error prefer-text-to-varchar : Prefer text to varchar types
public.staff.first_name: error prefer-text-to-varchar : Prefer text to varchar types
public.staff.last_name: error prefer-text-to-varchar : Prefer text to varchar types
public.staff.email: error prefer-text-to-varchar : Prefer text to varchar types
public.staff.username: error prefer-text-to-varchar : Prefer text to varchar types
public.staff.password: error prefer-text-to-varchar : Prefer text to varchar types
Suggested fix
ALTER TABLE "address" ALTER COLUMN "address" TYPE TEXT;
ALTER TABLE "address" ALTER COLUMN "address2" TYPE TEXT;
ALTER TABLE "address" ALTER COLUMN "district" TYPE TEXT;
ALTER TABLE "address" ALTER COLUMN "postal_code" TYPE TEXT;
ALTER TABLE "address" ALTER COLUMN "phone" TYPE TEXT;
ALTER TABLE "category" ALTER COLUMN "name" TYPE TEXT;
ALTER TABLE "country" ALTER COLUMN "country" TYPE TEXT;
ALTER TABLE "customer" ALTER COLUMN "first_name" TYPE TEXT;
ALTER TABLE "customer" ALTER COLUMN "last_name" TYPE TEXT;
ALTER TABLE "customer" ALTER COLUMN "email" TYPE TEXT;
ALTER TABLE "film" ALTER COLUMN "title" TYPE TEXT;
ALTER TABLE "staff" ALTER COLUMN "first_name" TYPE TEXT;
ALTER TABLE "staff" ALTER COLUMN "last_name" TYPE TEXT;
ALTER TABLE "staff" ALTER COLUMN "email" TYPE TEXT;
ALTER TABLE "staff" ALTER COLUMN "username" TYPE TEXT;
ALTER TABLE "staff" ALTER COLUMN "password" TYPE TEXT;
error Command failed with exit code 1.
You can play around with the configuration options in .schemalintrc.js file to experiment.