chore: use switchcase to pick serializer

.vscode/settings.json

@@ -1,4 +1,6 @@
 {
   "standard.enable": false,
-  "eslint.enable": true
+  "eslint.enable": true,
+  "eslint.autoFixOnSave": true,
+  "git.ignoreLimitWarning": true
 }

package.json

@@ -87,6 +87,7 @@
     "check-more-types": "2.24.0",
     "its-name": "1.0.0",
     "lazy-ass": "1.6.0",
-    "snap-shot-store": "1.2.3"
+    "snap-shot-store": "1.2.3",
+    "switchcase": "0.0.3"
   }
 }

src/index.js

@@ -1,12 +1,12 @@
 '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')
-
+const { serializeDomElement, identity, countSnapshots } = require('./utils')
+const switchcase = require('switchcase')
 /* eslint-disable no-console */
 
 function registerCypressSnapshot () {
@@ -41,15 +41,15 @@ function registerCypressSnapshot () {
     la(is.string(js), 'expected JavaScript snapshot source', js)
     console.log('read snapshots.js file')
     const store = eval(js) || {}
-    console.log('have %d snapshot(s)', Object.keys(store).length)
+    console.log('have %d snapshot(s)', countSnapshots(store))
     storeSnapshot = initStore(store)
   }
 
   global.before(() => {
     cy.log('before all tests')
     cy
-      .readFile(SNAPSHOT_FILENAME, 'utf-8', { log: false })
-      .then(evaluateLoadedSnapShots)
+    .readFile(SNAPSHOT_FILENAME, 'utf-8', { log: false })
+    .then(evaluateLoadedSnapShots)
     // no way to catch an error yet
   })
 
@@ -103,22 +103,10 @@ function registerCypressSnapshot () {
     })
   }
 
-  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
-  }
+  const pickSerializer = switchcase({
+    [isJqueryElement]: serializeDomElement,
+    default: identity
+  })
 
   function isJqueryElement (x) {
     return 'wrap' in x
@@ -126,11 +114,11 @@ function registerCypressSnapshot () {
 
   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)
-    }
+    const snapshotName = getSnapshotName(this.test, humanName)
+    const serializer = pickSerializer(value)
+    const serialized = serializer(value)
+    setSnapshot(snapshotName, serialized, value, humanName)
+
     // always just pass value
     return value
   }
@@ -141,7 +129,7 @@ function registerCypressSnapshot () {
     if (storeSnapshot) {
       cy.log('saving snapshots')
       const snapshots = storeSnapshot()
-      console.log('snapshots on finish')
+      console.log('%d snapshot(s) on finish', countSnapshots(snapshots))
       console.log(snapshots)
 
       snapshots.__version = Cypress.version

src/utils.js

@@ -1,3 +1,31 @@
-module.exports = {
-  SNAPSHOT_FILE_NAME: 'snapshots.js'
+const sd = require('@wildpeaks/snapshot-dom')
+
+// converts DOM element to a JSON object
+function serializeDomElement ($el) {
+  // 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
+  }
+
+  return json
+}
+
+const identity = (x) => x
+
+const publicProps = (name) => !name.startsWith('__')
+
+const countSnapshots = (snapshots) =>
+  Object.keys(snapshots).filter(publicProps).length
+
+module.exports = {
+  SNAPSHOT_FILE_NAME: 'snapshots.js',
+  serializeDomElement,
+  identity,
+  countSnapshots
 }