/**
 * Common scalar grammar for GCF.
 * Shared between encoder, decoder, and streaming encoder.
 */
/**
 * Policy for an in-domain integer whose magnitude exceeds 2^53-1 (a value the host
 * `number` cannot hold exactly). This is a JavaScript-local boundary, not the numeric
 * domain edge (which is int64 and is enforced regardless of this policy). SPEC 2.3.2.
 * - `'error'` (default): throw rather than return a value that would later lose
 *   precision in `number` arithmetic.
 * - `'string'`: return the decimal digits as a string (recommended for identifiers).
 * - `'bigint'`: return a native `bigint` (lossless, for consumers that compute on it).
 * - `'number'`: return a `number` (explicit, lossy).
 */
export type LargeIntMode = 'error' | 'string' | 'bigint' | 'number';
/** Set the large-integer policy for the current decode (see LargeIntMode). */
export declare function setLargeIntMode(mode: LargeIntMode): void;
/** Check if a string value must be quoted per Section 2.4. */
export declare function needsQuote(s: string): boolean;
/** Produce a JSON-compatible quoted string. */
export declare function quoteString(s: string): string;
/** Format a JS value as a GCF scalar. delimiter is '|', ',', or 0. */
export declare function formatScalar(v: unknown, delimiter?: number): string;
/** Format a number per Section 2.3 canonical rules. */
export declare function formatNumber(f: number): string;
/**
 * Format a graph score to exactly two decimals with round-half-to-even applied to
 * the exact IEEE-754 double (SPEC 5). This matches the C/Go printf family, Python,
 * Rust, and .NET. It deliberately does NOT use Number.prototype.toFixed, which
 * rounds half-up and diverges at exact binary midpoints (0.125 -> 0.12 not 0.13,
 * 0.625 -> 0.62 not 0.63), producing a non-interoperable wire.
 */
export declare function formatScore(x: number): string;
/** Check if a key is a valid bare key. */
export declare function isBareKey(s: string): boolean;
/** Format a key, quoting if necessary. */
export declare function formatKey(s: string): string;
/** Parse a GCF scalar token per Section 2.1 precedence. */
export declare function parseScalar(s: string, tabularContext: boolean): any;
export declare const MISSING: unique symbol;
export declare const ATTACHMENT: unique symbol;
/** Parse a JSON-compatible quoted string. */
export declare function parseQuotedString(s: string): string;
/** Split a string on a delimiter, respecting quoted strings. */
export declare function splitRespectingQuotes(s: string, delim: string): string[];
/** Split a field declaration like {id,"display name","a,b"}. */
export declare function splitFieldDecl(s: string): string[];
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