Scaffold monorepo dev setup

packages/config/src/env.ts

@@ -0,0 +1,34 @@
+import { z } from "zod";
+
+export class EnvError extends Error {
+  readonly issues: z.ZodIssue[];
+
+  constructor(message: string, issues: z.ZodIssue[]) {
+    super(message);
+    this.name = "EnvError";
+    this.issues = issues;
+  }
+}
+
+const formatIssues = (issues: z.ZodIssue[]): string => {
+  return issues
+    .map((issue) => {
+      const path = issue.path.length > 0 ? issue.path.join(".") : "<root>";
+      return `${path}: ${issue.message}`;
+    })
+    .join("; ");
+};
+
+export const readEnv = <T extends z.ZodTypeAny>(
+  schema: T,
+  env: Record<string, string | undefined> = Bun.env
+): z.infer<T> => {
+  const result = schema.safeParse(env);
+
+  if (!result.success) {
+    const details = formatIssues(result.error.issues);
+    throw new EnvError(`Invalid environment: ${details}`, result.error.issues);
+  }
+
+  return result.data;
+};