/**
 * Return `true` when `filePath` points at a regular file. Missing paths
 * return `false`; other filesystem errors are logged via
 * `Diagnostics.warn` and re-thrown.
 */
export declare function fileExists(filePath: string, source: string): boolean;
/**
 * List files in `dir` whose names end with `suffix` (e.g.
 * `.boundaries.ts`). Missing directories return `[]`; other errors are
 * logged and re-thrown.
 */
export declare function findConventionFiles(dir: string, suffix: string, source: string): readonly string[];
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