import type { Diagnostic, DiagnosticSeverity, SourceLocation } from './types.js';
export declare class DiagnosticCollector {
    private items;
    add(code: string, severity: DiagnosticSeverity, location: SourceLocation, why: string, hint?: string): void;
    error(code: string, location: SourceLocation, why: string, hint?: string): void;
    warning(code: string, location: SourceLocation, why: string, hint?: string): void;
    hasErrors(): boolean;
    hasWarnings(): boolean;
    errors(): Diagnostic[];
    warnings(): Diagnostic[];
    getAll(): Diagnostic[];
    isEmpty(): boolean;
    /** Promote all warnings to errors (--strict mode) */
    promoteWarnings(): void;
    /** Serialise to JSON (--format json) */
    toJSON(): object;
}
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