Fix TypeScript 6.0 compatibility errors in run.ts (#271)

package.json

@@ -7,12 +7,12 @@
    "license": "MIT",
    "type": "module",
    "dependencies": {
-      "@actions/core": "^3.0.1",
+      "@actions/core": "^3.0.0",
       "@actions/exec": "^3.0.0",
       "@actions/io": "^3.0.2",
       "@actions/tool-cache": "4.0.0",
       "@octokit/action": "^8.0.4",
-      "semver": "^7.7.4"
+      "semver": "^7.7.3"
    },
    "main": "lib/index.js",
    "scripts": {
@@ -25,11 +25,11 @@
       "prepare": "husky"
    },
    "devDependencies": {
-      "@types/node": "^25.6.0",
-      "esbuild": "^0.28",
+      "@types/node": "^25.0.9",
+      "esbuild": "^0.27",
       "husky": "^9.1.7",
-      "prettier": "^3.8.3",
-      "typescript": "^6.0.3",
+      "prettier": "^3.8.0",
+      "typescript": "^5.9.3",
       "vitest": "^4"
    }
 }

src/run.ts

@@ -30,7 +30,7 @@ export async function run() {
    core.endGroup()
 
    try {
-      if (!process.env['PATH'].startsWith(path.dirname(cachedPath))) {
+      if (!process.env['PATH']?.startsWith(path.dirname(cachedPath))) {
          core.addPath(path.dirname(cachedPath))
       }
    } catch {
@@ -54,7 +54,7 @@ export async function getLatestHelmVersion(): Promise<string> {
       return release
    } catch (err) {
       core.warning(
-         `Error while fetching latest Helm release: ${err.toString()}. Using default version ${stableHelmVersion}`
+         `Error while fetching latest Helm release: ${err instanceof Error ? err.message : String(err)}. Using default version ${stableHelmVersion}`
       )
       return stableHelmVersion
    }