Miscellaneous cleanup

README.md

@@ -31,6 +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` | A comma separated list of extensions to run ESLint on. | no | `".js,.ts,.jsx,.tsx,.mjs,.cjs"` |
 
 ## Outputs
 

action.yml

@@ -1,5 +1,5 @@
-name: "Balto - Eslint"
-description: "Run eslint on your repo"
+name: "Balto - ESLint"
+description: "Run ESLint on your repo"
 runs:
   using: node20
   main: dist/index.js
@@ -19,6 +19,10 @@ inputs:
     description: Which directory to run the action in
     required: false
     default: "."
+  extensions:
+    description: A comma separated list of extensions to run ESLint on.
+    required: false
+    default: ".js,.ts,.jsx,.tsx,.mjs,.cjs"
 outputs:
   warning-count:
     description: "Number of relevant warnings found"

devbox.json

@@ -24,14 +24,14 @@
         "cp test/snapshots/base/* test/v7",
         "cp test/snapshots/base/* test/v8",
         "cp test/snapshots/base/* test/v9",
-        "git add . && git commit -m 'Undo simulated changes'",
+        "git add . && git commit -m 'Automated: Undo simulated changes'",
         "echo \"{ \\\"pull_request\\\": { \\\"base\\\": { \\\"sha\\\": \\\"$(git rev-parse HEAD)\\\" } } }\" > test/pull_request_event_payload.json",
-        "git add . && git commit -m 'Update test target sha'",
+        "git add . && git commit -m 'Automated: Update test target sha'",
         "cp test/snapshots/updates/* test/v6",
         "cp test/snapshots/updates/* test/v7",
         "cp test/snapshots/updates/* test/v8",
         "cp test/snapshots/updates/* test/v9",
-        "git add . && git commit -m 'Simulate changes'"
+        "git add . && git commit -m 'Automated: Simulate changes'"
       ]
     }
   }

src/eslint_result.ts

@@ -3,10 +3,10 @@ import { ChangeRange, generateChangeRanges } from "./git_utils"
 
 export type ResultObject = {
   filePath: string
-  messages: EslintMessage[]
+  messages: ESLintMessage[]
 }
 
-type EslintMessage = {
+type ESLintMessage = {
   ruleId: string
   severity: Severity
   message: string
@@ -24,22 +24,22 @@ enum Severity {
   Error = 2,
 }
 
-export class EslintResult {
+export class ESLintResult {
   public relevantWarningCount: number = 0
   public relevantErrorCount: number = 0
   private resultObject: ResultObject
   private changeRanges: ChangeRange[]
-  private relevantMessages: EslintMessage[] = []
+  private relevantMessages: ESLintMessage[] = []
 
   static async for(
     resultObject: ResultObject,
     compareSha: string,
-  ): Promise<EslintResult> {
+  ): Promise<ESLintResult> {
     const changeRanges = await generateChangeRanges(
       resultObject.filePath,
       compareSha,
     )
-    return new EslintResult(resultObject, changeRanges)
+    return new ESLintResult(resultObject, changeRanges)
   }
 
   constructor(resultObject: ResultObject, changeRanges: ChangeRange[]) {

src/index.ts

@@ -1,7 +1,7 @@
 import * as core from "@actions/core"
 import { detectChangedFiles, detectChangedFilesInFolder } from "./git_utils"
 import { getExecOutput } from "@actions/exec"
-import { ResultObject, EslintResult } from "./eslint_result"
+import { ResultObject, ESLintResult } from "./eslint_result"
 
 async function run() {
   let workingDirectory = core.getInput("working-directory")
@@ -34,17 +34,31 @@ async function run() {
 
   core.debug(`Changed files: ${changedFiles}`)
 
-  let { stdout: eslintOut } = await getExecOutput(
+  let extensions = core.getInput("extensions").split(",")
+  core.debug(`Extensions: ${extensions}`)
+  let changedFilesMatchingExtensions = changedFiles.filter((file) =>
+    extensions.some((ext) => file.endsWith(ext)),
+  )
+  core.debug(
+    `Changed files matching extensions: ${changedFilesMatchingExtensions}`,
+  )
+
+  // Bail out early if the file list is empty (older ESLint versions will
+  // complain if the list is empty)
+  if (changedFilesMatchingExtensions.length === 0) return
+
+  let { stdout: eslintOut, exitCode } = await getExecOutput(
     "npx eslint --format=json",
-    changedFiles,
+    changedFilesMatchingExtensions,
     // Eslint will return exit code 1 if it finds linting problems, but that is
     // expected and we don't want to stop execution because of it.
     { ignoreReturnCode: true },
   )
   let eslintJson = JSON.parse(eslintOut)
+  core.debug(`Eslint exit code: ${exitCode}`)
 
-  let promises: Array<Promise<EslintResult>> = eslintJson.map(
-    (resultObject: ResultObject) => EslintResult.for(resultObject, compareSha),
+  let promises: Array<Promise<ESLintResult>> = eslintJson.map(
+    (resultObject: ResultObject) => ESLintResult.for(resultObject, compareSha),
   )
   let eslintResults = await Promise.all(promises)
 

test/pull_request_event_payload.json

@@ -1 +1 @@
-{ "pull_request": { "base": { "sha": "c2eaebd173390cb17efa35fce4d4941ccd5b3b5c" } } }
+{ "pull_request": { "base": { "sha": "54de0dbcb922b6544025d1604d46146fcbdbda81" } } }

test/snapshots/updates/some_file_that_eslint_should_ignore

@@ -0,0 +1,4 @@
+class EslintShouldIgnoreThis
+    def evenThoughItsWeird (*)
+ end
+ end

test/v6/some_file_that_eslint_should_ignore

@@ -0,0 +1,4 @@
+class EslintShouldIgnoreThis
+    def evenThoughItsWeird (*)
+ end
+ end

test/v7/some_file_that_eslint_should_ignore

@@ -0,0 +1,4 @@
+class EslintShouldIgnoreThis
+    def evenThoughItsWeird (*)
+ end
+ end

test/v8/some_file_that_eslint_should_ignore

@@ -0,0 +1,4 @@
+class EslintShouldIgnoreThis
+    def evenThoughItsWeird (*)
+ end
+ end

test/v9/some_file_that_eslint_should_ignore

@@ -0,0 +1,4 @@
+class EslintShouldIgnoreThis
+    def evenThoughItsWeird (*)
+ end
+ end