centralize email parsing logic

shared/utils/email.test.ts

@@ -0,0 +1,24 @@
+import { parseEmail } from "./email";
+
+describe("parseEmail", () => {
+  it("should correctly parse email", () => {
+    expect(parseEmail("tom@example.com")).toEqual({
+      local: "tom",
+      domain: "example.com",
+    });
+    expect(parseEmail("tom.m@example.com")).toEqual({
+      local: "tom.m",
+      domain: "example.com",
+    });
+    expect(parseEmail("tom@subdomain.domain.com")).toEqual({
+      local: "tom",
+      domain: "subdomain.domain.com",
+    });
+  });
+
+  it("should throw error for invalid email", () => {
+    expect(() => parseEmail("")).toThrow();
+    expect(() => parseEmail("invalid")).toThrow();
+    expect(() => parseEmail("invalid@")).toThrow();
+  });
+});