use specPattern to detect Cypress version

Author: joshuajtward

README.md

@@ -79,7 +79,6 @@ To use this module with [Cypress v10.0.0](https://docs.cypress.io/guides/referen
 
 ```js
 {
-  env: { grepNewConfig: true },
   e2e: {
     setupNodeEvents(on, config) {
       require('cypress-grep/src/plugin')(config);

src/plugin.js

@@ -17,9 +17,12 @@ function cypressGrepPlugin(config) {
 
   const { env } = config
 
+  // detecting which version is running using specPattern - specPattern is only present from v10.0.0+
+  const isAtLeastV10 = config.e2e.specPattern || config.component.specPattern
+
   debug(
     'Config type: %s',
-    env.grepNewConfig
+    isAtLeastV10
       ? 'new (Cypress version >= v10.0.0)'
       : 'legacy (Cypress version < v10.0.0)',
   )
@@ -117,7 +120,7 @@ function cypressGrepPlugin(config) {
       debug('%o', greppedSpecs)
     }
     if (greppedSpecs.length) {
-      env.grepNewConfig
+      isAtLeastV10
         ? (config.specPattern = greppedSpecs)
         : (config.testFiles = greppedSpecs)
     } else {

src/utils.js

@@ -77,8 +77,8 @@ function parseTagsGrep(s) {
     })
 
   // filter out undefined from explicit not tags
-  const ORS_filtered = ORS.filter(x => x !==undefined)
-  if(explicitNotTags.length > 0 ){
+  const ORS_filtered = ORS.filter((x) => x !== undefined)
+  if (explicitNotTags.length > 0) {
     ORS_filtered.forEach((OR, index) => {
       ORS_filtered[index] = OR.concat(explicitNotTags)
     })