feat(resolve-check-config): add ability to use a config file to adjust jobs (#255)

resolve-check-config/src/kind.ts

@@ -0,0 +1,22 @@
+import { Kind } from './types';
+
+/**
+ * Type guard for the `kind` input. Use this when you have an
+ * `unknown` value (e.g. from `core.getInput`) and want to narrow it
+ * without throwing.
+ */
+export const isKind = (value: unknown): value is Kind =>
+  value === 'store' || value === 'extension';
+
+/**
+ * Narrows an `unknown` (typically the raw action input) to `Kind` or
+ * throws a user-facing error naming the accepted values. Prefer this
+ * at the action boundary so a bad `kind` fails fast with a clear
+ * message rather than later as an obscure dispatch miss.
+ */
+export const assertKind = (value: unknown): Kind => {
+  if (!isKind(value)) {
+    throw new Error(`check-config: \`kind\` must be 'store' or 'extension' (got ${JSON.stringify(value)})`);
+  }
+  return value;
+}