/**
 * Public configuration and measurement vocabulary for replay token metering.
 *
 * @module @deepseek-ai/dsh-token-meter/types
 */
import type { TokenUsage } from '@deepseek-ai/dsh-llm';
export type { ContextBreakdownProjection, ContextPressureProjection, TokenUsageProjection } from './projection.ts';
/** Token-meter plugin configuration; the fixed estimator has no settings. */
export type TokenMeterConfig = Record<string, never>;
/** The baseline from which a signed surface delta produces current pressure. */
export type TokenMeasurementBaseline = {
    readonly kind: 'none';
    readonly tokens: 0;
} | {
    readonly kind: 'estimated';
    readonly tokens: number;
} | {
    readonly kind: 'usage';
    readonly tokens: number;
    readonly usage: Readonly<TokenUsage>;
};
/** Detached immutable request-pressure and surface snapshot at one consumed log revision. */
export interface TokenMeasurement {
    /** Number of durable events consumed; equal to the next unread event seq. */
    readonly logRevision: number;
    /** Provider or heuristic anchor used for this measurement. */
    readonly baseline: TokenMeasurementBaseline;
    /** Signed repricing of current surface content relative to the baseline anchor. */
    readonly surfaceDeltaTokens: number;
    /** Non-negative current request-and-response pressure. */
    readonly totalTokens: number;
    /** Total heuristic tokens across the current surface. */
    readonly surfaceTokens: number;
    /** Current surface nodes in positional head-to-tail order. */
    readonly nodes: readonly TokenSurfaceNode[];
}
/** One token-priced node in the current ordered session surface. */
export interface TokenSurfaceNode {
    /** Durable sequence number of the surface event. */
    readonly seq: number;
    /** Heuristic tokens for the exact message projected by this node. */
    readonly tokens: number;
}
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