Switch space -> comma separated args

And reuse the previous (shorter) description of the input

README.md

@@ -31,7 +31,7 @@ jobs:
 | `failure-level` | The lowest annotation level to fail on ("warning or "error"") | no | `"error"` |
 | `conclusion-level` | Action conclusion ("success" or "failure") if annotations of the failure-level were created. | no | `"success"` |
 | `working-directory` | Which directory to run the action in | no | `"."` |
-| `extensions` | Space separated list of extenions. Only changed files with these extensions will be passed to ESlint. | no | `".js .ts .jsx .tsx .mjs .cjs"` |
+| `extensions` | A comma separated list of extensions to run ESLint on. | no | `".js,.ts,.jsx,.tsx,.mjs,.cjs"` |
 
 ## Outputs
 

action.yml

@@ -20,9 +20,9 @@ inputs:
     required: false
     default: "."
   extensions:
-    description: Space separated list of extenions. Only changed files with these extensions will be passed to ESlint.
+    description: A comma separated list of extensions to run ESLint on.
     required: false
-    default: ".js .ts .jsx .tsx .mjs .cjs"
+    default: ".js,.ts,.jsx,.tsx,.mjs,.cjs"
 outputs:
   warning-count:
     description: "Number of relevant warnings found"

src/index.ts

@@ -34,7 +34,7 @@ async function run() {
 
   core.debug(`Changed files: ${changedFiles}`)
 
-  let extensions = core.getInput("extensions").split(" ")
+  let extensions = core.getInput("extensions").split(",")
   core.debug(`Extensions: ${extensions}`)
   let changedFilesMatchingExtensions = changedFiles.filter((file) =>
     extensions.some((ext) => file.endsWith(ext)),