import * as ts from "typescript";
/**
 * Performs an incremental type-check (no emit) for the given project directory.
 * It reads tsconfig.json (just like the tsc CLI does) and enforces the `noEmit` flag.
 *
 * @param projectDir - The path to the project (where tsconfig.json is located).
 * @param oldProgram - Optionally, the previous builder program for incremental builds.
 * @returns An object containing the new builder program and collected diagnostics.
 */
export interface CheckpointData {
    program: ts.EmitAndSemanticDiagnosticsBuilderProgram;
    diagnostics: ts.Diagnostic[];
}
export type Checkpoint = CheckpointData | null;
export declare function runCheckpoint(projectDir: string, oldProgram?: ts.EmitAndSemanticDiagnosticsBuilderProgram): Checkpoint;
export declare function filterDiagnostic(c: ts.Diagnostic): boolean;
/**
 * Given a new list of diagnostics and a baseline list, filter out diagnostics
 * that were already present in the baseline.
 */
export declare function filterBaselineDiagnostics(baselineFingerprints: Set<string>, checkpoint: Checkpoint): ts.Diagnostic[];
export declare function createFingerprintSet(checkpoint: Checkpoint): Set<string>;
/**
 * Pretty prints diagnostics as a plain text string.
 *
 * @param diagnostics - An array of ts.Diagnostic objects.
 * @returns A formatted string that describes the diagnostics.
 */
export declare function prettyPrintDiagnostics(diagnostics: ts.Diagnostic[]): string;
export declare function prettyPrintDiagnosticsWithContext(diagnostics: ts.Diagnostic[]): string;