feat: split functions from support file

BREAKING CHANGE: if you want to use custom commands, you need
to explicitly require the support file like this.

```js
require('@cypress/skip-test/support')
```

This way you can import individual functions without adding them
as custom commands.

Author: bahmutov

README.md

@@ -19,10 +19,10 @@ npm install -D @cypress/skip-test
 
 ## Example
 
-You can use this module as custom Cypress commands `cy.skipOn` and `cy.onlyOn` or by importing its functions. To use custom commands, add this module to your support file `cypress/support/index.js`
+You can use this module as custom Cypress commands `cy.skipOn` and `cy.onlyOn` or by importing its functions. To use custom commands like `cy.skipOn`, add this module to your support file `cypress/support/index.js`
 
 ```js
-require('@cypress/skip-test')
+require('@cypress/skip-test/support')
 ```
 
 ### `cy.skipOn`

cypress/integration/callback-spec.js

@@ -10,5 +10,6 @@ onlyOn('mac', () => {
 })
 
 skipOn('mac', () => {
+  // this test will run on every platform but Mac
   it('hides this test on Mac', () => {})
 })

cypress/support/index.js

@@ -12,4 +12,4 @@
 // You can read more here:
 // https://on.cypress.io/configuration
 // ***********************************************************
-require('../..')
+require('../../support')

index.js

@@ -135,10 +135,6 @@ const onlyOn = (name, cb) => {
   }
 }
 
-Cypress.Commands.add('skipOn', skipOn)
-
-Cypress.Commands.add('onlyOn', onlyOn)
-
 module.exports = {
   skipOn,
   onlyOn

package.json

@@ -29,6 +29,7 @@
   "homepage": "https://github.com/cypress-io/cypress-skip-test#readme",
   "files": [
     "index.js",
-    "index.d.ts"
+    "index.d.ts",
+    "support.js"
   ]
 }

support.js

@@ -0,0 +1,8 @@
+/// <reference path="./index.d.ts" />
+// @ts-check
+
+const { skipOn, onlyOn } = require('.')
+
+Cypress.Commands.add('skipOn', skipOn)
+
+Cypress.Commands.add('onlyOn', onlyOn)