Refactor entire project (#39)

- Use more modern TypeScript conventions
- Use JavaScript Kubernetes Client
- Add unit tests
- Add integration tests
- Add TypeScript compile verify workflow
- Switch codeowners

src/types/k8sSecret.ts

@@ -0,0 +1,25 @@
+import * as util from "util";
+
+export interface K8sSecret {
+  data: {
+    token: string;
+    "ca.crt": string;
+  };
+}
+
+/**
+ * Throws an error if an object does not have all required fields to be a K8sSecret
+ * @param secret
+ * @returns A type guarded K8sSecret
+ */
+export function parseK8sSecret(secret: any): K8sSecret {
+  if (!secret) throw Error("K8s secret yaml is invalid");
+  if (!secret.data) throw k8sSecretMissingFieldError("data");
+  if (!secret.data.token) throw k8sSecretMissingFieldError("token");
+  if (!secret.data["ca.crt"]) throw k8sSecretMissingFieldError("ca.crt");
+
+  return secret as K8sSecret;
+}
+
+const k8sSecretMissingFieldError = (field: string): Error =>
+  Error(util.format("K8s secret yaml does not contain %s field", field));