export interface NormalizedPromptUsage {
    /** Uncached input tokens. */
    inputTokens: number;
    /** Prompt tokens read from cache, excluded from inputTokens. */
    cacheReadTokens?: number;
    /** Prompt tokens written to cache, excluded from inputTokens. */
    cacheCreationTokens?: number;
}
export declare function totalPromptTokens(usage: NormalizedPromptUsage): number;
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