export type MarkerResolution = {
    success: true;
    offset: number;
} | {
    success: false;
    error: string;
};
export declare function findUniqueMarkerOffset(content: string, marker: string, kind: 'insertBefore' | 'insertAfter'): MarkerResolution;
export type BoundaryCheckResult = {
    success: true;
} | {
    success: false;
    error: string;
};
export declare function assertOffsetNotInsideDecodedWidget(content: string, offset: number): BoundaryCheckResult;
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