Function env

env<T extends SchemaBuilder<any, any, any, any, any>>(
varName: string,
schema: T,
): EnvField<T>
Associates a schema builder with an environment variable name.

Every leaf field in a config descriptor passed to parseEnv() must be wrapped with env(). This is enforced at the TypeScript level — passing a bare schema builder produces a compile-time error.
Type Parameters
- T extends SchemaBuilder<any, any, any, any, any>
Parameters
- varName: string
  The environment variable name to read (e.g. 'DB_HOST').
- schema: T
  A @cleverbrush/schema builder describing the expected type, constraints, coercion, and defaults.
Returns EnvField<T>
A branded EnvField descriptor.
Example
```
env('DB_PORT', number().coerce().default(5432))
```
- Defined in libs/env/src/env.ts:21