export type HostSourceRange = Readonly<{
    start: number;
    end: number;
}>;
export type HostSourcePosition = Readonly<{
    offset: number;
    line: number;
    column: number;
}>;
export type EmbeddedHsonSource = Readonly<{
    fileName: string;
    hostText: string;
    tagRange: HostSourceRange;
    templateRange: HostSourceRange;
    bodyRange: HostSourceRange;
}>;
export type EmbeddedHsonSourceInvalidReason = "descriptor-not-object" | "file-name-invalid" | "host-text-invalid" | "tag-range-invalid" | "template-range-invalid" | "body-range-invalid" | "tag-after-template" | "body-outside-template";
export type EmbeddedHsonSourceValidation = Readonly<{
    status: "valid";
    source: EmbeddedHsonSource;
}> | Readonly<{
    status: "invalid";
    reason: EmbeddedHsonSourceInvalidReason;
}>;
/** Validate and freeze one exact original-host embedded Hson descriptor. */
export declare function validate_embedded_hson_source(value: unknown): EmbeddedHsonSourceValidation;
export declare function read_embedded_hson_body(source: EmbeddedHsonSource): string;
/** Return the smallest Unicode-safe visible range at one UTF-16 source offset. */
export declare function source_point_range_at(sourceText: string, index: number): HostSourceRange | undefined;
export type HostSourceLocator = Readonly<{
    positionAt(offset: number): HostSourcePosition | undefined;
}>;
/** Build one reusable line-start table for a host source. */
export declare function create_host_source_locator(hostText: string): HostSourceLocator | undefined;
export declare function host_source_position_at(hostText: string, offset: number): HostSourcePosition | undefined;
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