chore: move code

.eslintrc

@@ -1,5 +1,11 @@
 {
   "extends": [
     "plugin:cypress-dev/general"
-  ]
+  ],
+  "rules": {
+    "comma-dangle": ["off"]
+  },
+  "env": {
+    "node": true
+  }
 }

package.json

@@ -79,7 +79,10 @@
     "pre-git": "3.16.0"
   },
   "dependencies": {
+    "@wildpeaks/snapshot-dom": "1.2.1",
     "check-more-types": "2.24.0",
-    "lazy-ass": "1.6.0"
+    "its-name": "1.0.0",
+    "lazy-ass": "1.6.0",
+    "snap-shot-store": "1.2.3"
   }
 }

src/index.js

@@ -1,5 +1,153 @@
 'use strict'
 
+/* global cy, Cypress */
+const sd = require('@wildpeaks/snapshot-dom')
+const itsName = require('its-name')
+const { initStore } = require('snap-shot-store')
+const la = require('lazy-ass')
+const is = require('check-more-types')
 
-module.exports = true
+/* eslint-disable no-console */
 
+function registerCypressSnapshot () {
+  la(is.fn(global.before), 'missing global before function')
+  la(is.fn(global.after), 'missing global after function')
+  la(is.object(global.Cypress), 'missing Cypress object')
+
+  let storeSnapshot
+
+  // for each full test name, keeps number of snapshots
+  // allows using multiple snapshots inside single test
+  // without confusing them
+  // eslint-disable-next-line immutable/no-let
+  let counters = {}
+
+  function getSnapshotIndex (key) {
+    if (key in counters) {
+      // eslint-disable-next-line immutable/no-mutation
+      counters[key] += 1
+    } else {
+      // eslint-disable-next-line immutable/no-mutation
+      counters[key] = 1
+    }
+    return counters[key]
+  }
+
+  const SNAPSHOT_FILENAME = 'snapshots.js'
+
+  function evaluateLoadedSnapShots (js) {
+    la(is.string(js), 'expected JavaScript snapshot source', js)
+    console.log('read snapshots.js file')
+    console.log(js)
+    const store = eval(js) || {}
+    console.log('store')
+    console.log(store)
+    storeSnapshot = initStore(store)
+  }
+
+  global.before(() => {
+    cy.log('before all tests')
+    cy.readFile(SNAPSHOT_FILENAME, 'utf-8').then(evaluateLoadedSnapShots)
+    // no way to catch an error yet
+  })
+
+  function getTestName (test) {
+    const names = itsName(test)
+    // la(is.strings(names), 'could not get name from current test', test)
+    return names
+  }
+
+  function getSnapshotName (test, humanName) {
+    const names = getTestName(test)
+    const key = names.join(' - ')
+    const index = humanName || getSnapshotIndex(key)
+    names.push(String(index))
+    return names
+  }
+
+  function setSnapshot (name, value, $el) {
+    // snapshots were not initialized
+    if (!storeSnapshot) {
+      return
+    }
+
+    // show just the last part of the name list (the index)
+    const message = Cypress._.last(name)
+    console.log('current snapshot name', name)
+
+    const options = {
+      name: 'snapshot',
+      message,
+      consoleProps: () => {
+        const devToolsLog = {
+          value,
+          snapshot: message
+        }
+        if ($el) {
+          devToolsLog.$el = $el
+        }
+        return devToolsLog
+      }
+    }
+
+    if ($el) {
+      options.$el = $el
+    }
+
+    Cypress.log(options)
+    storeSnapshot({
+      value,
+      name
+    })
+  }
+
+  function snapshot$ (test, $el, humanName) {
+    console.log('snapshot value!', $el)
+    const json = sd.toJSON($el.context)
+    // remove React id, too transient
+    delete json.attributes['data-reactid']
+    console.log('as json', json)
+
+    // hmm, why is value not serialized?
+    if ($el.context.value && !json.attributes.value) {
+      json.attributes.value = $el.context.value
+    }
+
+    const name = getSnapshotName(test, humanName)
+    setSnapshot(name, json, $el, humanName)
+    return $el
+  }
+
+  function isJqueryElement (x) {
+    return 'wrap' in x
+  }
+
+  function snapshot (value, humanName) {
+    console.log('human name', humanName)
+    if (isJqueryElement(value)) {
+      snapshot$(this.test, value, humanName)
+    } else {
+      setSnapshot(getSnapshotName(this.test, humanName), value, humanName)
+    }
+    // always just pass value
+    return value
+  }
+
+  Cypress.Commands.add('snapshot', { prevSubject: true }, snapshot)
+
+  global.after(() => {
+    if (storeSnapshot) {
+      cy.log('saving snapshots')
+      const snapshots = storeSnapshot()
+      console.log('snapshots on finish')
+      console.log(snapshots)
+
+      snapshots.__version = Cypress.version
+      const s = JSON.stringify(snapshots, null, 2)
+      const str = `module.exports = ${s}\n`
+      cy.writeFile(SNAPSHOT_FILENAME, str, 'utf-8')
+    }
+  })
+}
+
+module.exports = registerCypressSnapshot