export declare const EXTRACT_TEXT_NAME = "extract_text";
export declare const EXTRACT_TEXT_INPUT_SCHEMA: {
    readonly type: "object";
    readonly additionalProperties: false;
    readonly required: readonly ["pdfBase64"];
    readonly properties: {
        readonly pdfBase64: {
            readonly type: "string";
            readonly minLength: 4;
            readonly description: "Base64-encoded PDF bytes.";
        };
        readonly pages: {
            readonly type: "array";
            readonly description: "Optional 0-based page indices to extract. When omitted, every page is extracted.";
            readonly maxItems: 1000;
            readonly items: {
                readonly type: "integer";
                readonly minimum: 0;
            };
        };
    };
};
export declare const EXTRACT_TEXT_OUTPUT_SCHEMA: {
    readonly type: "object";
    readonly additionalProperties: false;
    readonly required: readonly ["pageCount", "extractedPageCount", "extractable", "pages", "fullText"];
    readonly properties: {
        readonly pageCount: {
            readonly type: "integer";
            readonly minimum: 0;
        };
        readonly extractedPageCount: {
            readonly type: "integer";
            readonly minimum: 0;
        };
        readonly extractable: {
            readonly type: "boolean";
            readonly description: "False when one or more requested pages had a non-empty content stream but yielded no extractable text (likely subset fonts without /ToUnicode).";
        };
        readonly extractableReason: {
            readonly type: "string";
            readonly description: "Human-readable explanation when extractable=false. Absent when extractable=true.";
        };
        readonly pages: {
            readonly type: "array";
            readonly items: {
                readonly type: "object";
                readonly additionalProperties: false;
                readonly required: readonly ["index", "text"];
                readonly properties: {
                    readonly index: {
                        readonly type: "integer";
                        readonly minimum: 0;
                    };
                    readonly text: {
                        readonly type: "string";
                    };
                };
            };
        };
        readonly fullText: {
            readonly type: "string";
        };
    };
};
export interface ExtractedPage {
    readonly index: number;
    readonly text: string;
}
export interface ExtractTextResult {
    readonly pageCount: number;
    readonly extractedPageCount: number;
    readonly extractable: boolean;
    readonly extractableReason?: string;
    readonly pages: readonly ExtractedPage[];
    readonly fullText: string;
}
/**
 * Tokenise a single page's content stream and concatenate the operand strings
 * of every text-showing operator. Strings are emitted in the order they appear;
 * paragraph breaks are inferred from BT/ET blocks (one newline per text object).
 */
/** @internal — exported for unit-testing only. */
export declare function _extractPageTextForTesting(latin1: string): string;
export declare function extractText(rawInput: unknown): Promise<ExtractTextResult>;
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