diff --git a/action.js b/action.js
index 2cc6a36..e03411f 100644
--- a/action.js
+++ b/action.js
@@ -16,6 +16,11 @@ const replaceEnvVars = (str) => {
       /\$\{([a-zA-Z0-9_]+):\+:\$[a-zA-Z0-9_]+\}/g,
       (_, key) => ((v) => v ? `:${v}` : "")(process.env[key]),
     )
+    // handles ${FOO:-bar} > $FOO || "bar"
+    .replaceAll(
+      /\$\{([a-zA-Z0-9_]+):-([^}]*)\}/g,
+      (_, key, defaultVal) => process.env[key] || defaultVal,
+    )
     .replaceAll(/\$\{([a-zA-Z0-9_]+)\}/g, (_, key) => process.env[key] ?? "")
     .replaceAll(/\$([a-zA-Z0-9_]+)/g, (_, key) => process.env[key] ?? "");
   return value;
diff --git a/deno.json b/deno.json
index 39e8daf..5547f72 100644
--- a/deno.json
+++ b/deno.json
@@ -5,7 +5,10 @@
   "pkgx": "deno^2.1",
   "lint": {
     "include": ["src/", "./app.ts"],
-    "exclude": ["**/*.test.ts", "./action.js"]
+    "exclude": ["**/*.test.ts", "./action.js"],
+    "rules": {
+      "exclude": ["no-import-prefix", "no-unversioned-import"]
+    }
   },
   "test": {
     "include": ["src/"]