/**
 * WAW037: Null Values in CloudFormation Resource Properties
 *
 * `resource.PropName` where PropName is not a real GetAtt attribute returns null
 * silently in chant's AttrRef system — the TypeScript types say `string` but the
 * runtime value is null. This produces a template with literal null values that
 * CloudFormation rejects at changeset time with an unhelpful "Invalid template"
 * error.
 *
 * Common causes:
 *   - `resource.SomeId` instead of `Ref(resource)` (use Ref for the primary identifier)
 *   - `resource.SomeProp` where SomeProp is not listed in AWS CloudFormation GetAtt docs
 *   - Typo in an attribute name (e.g. `resource.GroupName` vs `resource.GroupId`)
 *
 * This check scans every resource's Properties for null values at any depth and
 * reports the logical resource ID and dotted property path.
 */
import type { PostSynthCheck, PostSynthContext, PostSynthDiagnostic } from "@intentius/chant/lint/post-synth";
export declare function checkNullProperties(ctx: PostSynthContext): PostSynthDiagnostic[];
export declare const waw037: PostSynthCheck;
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