/**
 * Marker key + value injected on every {@link CallMetadata} object by the log transform plugin.
 * Used by {@link isLogMeta} to detect a log-meta argument at runtime (e.g. for variadic
 * `param_index: 'last'` callees that don't have a fixed meta slot).
 */
export declare const LOG_META_MARKER = "~LogMeta";
/**
 * Metadata injected by the log transform plugin.
 *
 * Field names are intentionally short to reduce the size of the generated code.
 */
export interface CallMetadata {
    /**
     * Marker tag — when present, equal to {@link LOG_META_MARKER} ({@link `'~LogMeta'`}).
     * Injected by the log transform plugin on every emitted meta object so that {@link isLogMeta}
     * can distinguish a meta argument from a regular user-supplied value at runtime.
     * Optional because hand-written `CallMetadata` literals (decorators, RPC mappers, tests)
     * don't need the marker — they are recognized by position in the call signature.
     */
    '~LogMeta'?: typeof LOG_META_MARKER;
    /**
     * File name.
     */
    F: string;
    /**
     * Line number.
     */
    L: number;
    /**
     * Value of `this` at the site of the log call.
     * Will be set to the class instance if the call is inside a method, or to the `globalThis` (`window` or `global`) otherwise.
     */
    S: any | undefined;
    /**
     * A callback that will invoke the provided function with provided arguments.
     * Useful in the browser to force a `console.log` call to have a certain stack-trace.
     */
    C?: (fn: Function, args: any[]) => void;
    /**
     * Source code of the argument list.
     */
    A?: string[];
}
/**
 * Type guard: `true` when `value` is a {@link CallMetadata} object emitted by the log transform plugin.
 * Detection is based on the presence of the {@link LOG_META_MARKER} marker key/value.
 */
export declare const isLogMeta: (value: unknown) => value is CallMetadata;
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