import { type FlowrGasConfig, GasLevel, type GasOverrides } from '../../gas';
import type { FlowrAnalyzerGasPlugin } from '../plugins/gas-plugins/flowr-analyzer-gas-plugin';
import type { FlowrAnalyzerContext } from './flowr-analyzer-context';
import type { InvalidationEvent, InvalidationEventReceiver } from '../cache/flowr-cache';
/** Read-only gas context exposed via `ctx.gas`. */
export interface ReadOnlyFlowrAnalyzerGasContext {
    readonly name: string;
    /**
     * Returns the resource-pressure level for `key` (`config.gas.features[key]`).
     * Returns `GasLevel.Normal` with zero overhead when the feature factor is 0 or absent
     * and no gas plugins are registered (plugins are always consulted and may escalate any key).
     *
     * Measured from the start of the enclosing contingent, against the thresholds configured for `key`
     * (see {@link GasThresholdSpec}), not one allowance shared by everything the analyzer does.
     */
    checkGas(key: string): GasLevel;
    /**
     * A view with a fresh contingent, measured from this call, for one operation to run against.
     * The enclosing bounds still apply, `overrides` winning over them. Derives a new object rather than
     * mutating this one, so it is safe for nested and concurrent work.
     */
    scope(overrides?: GasOverrides): ReadOnlyFlowrAnalyzerGasContext;
}
/**
 * The gas context as the owner of the analyzer sees it, reachable via `analyzer.context().gas`.
 * Adds the operations that restart a contingent to {@link ReadOnlyFlowrAnalyzerGasContext}.
 */
export interface WriteableFlowrAnalyzerGasContext extends ReadOnlyFlowrAnalyzerGasContext {
    /** see {@link FlowrAnalyzerGasContext#reset} */
    reset(): void;
    /** see {@link FlowrAnalyzerGasContext#withGas} */
    withGas<T>(overrides: GasOverrides | undefined, fn: () => T): T;
}
/** Checks heap and elapsed-time pressure for named analysis features. See {@link ReadOnlyFlowrAnalyzerGasContext}. */
export declare class FlowrAnalyzerGasContext implements WriteableFlowrAnalyzerGasContext, InvalidationEventReceiver {
    readonly name = "flowr-analyzer-gas-context";
    /** what a gas check falls back to when no operation declared a contingent of its own */
    private readonly base;
    /** the contingents of the operations in flight, innermost last */
    private readonly frames;
    private readonly config;
    private readonly ctx;
    private readonly plugins;
    constructor(ctx: FlowrAnalyzerContext, config: FlowrGasConfig | undefined, plugins: readonly FlowrAnalyzerGasPlugin[]);
    /**
     * Restart the contingent, so what follows is measured from now. Supported API: call it between phases
     * that should each get the full allowance (`analyzer.context().gas.reset()`).
     *
     * flowR calls it itself whenever a new analysis begins, so a caller only has to split its *own* phases.
     * Operations in flight keep their contingent, as restarting a running traversal's clock would defeat the
     * guard bounding it.
     */
    reset(): void;
    /** A new analysis makes the spent contingent irrelevant. */
    receive(_event: InvalidationEvent): void;
    /**
     * Run `fn` against a fresh contingent bounded by `overrides`, ending when it settles if `fn` is async.
     * Every check while `fn` runs sees it, however deep, which is how the bounds reach sites that only ever
     * get a context handed to them.
     *
     * Being ambient, concurrent operations on one analyzer see whichever started last, so prefer
     * {@link scope} wherever the context can be threaded through.
     */
    withGas<T>(overrides: GasOverrides | undefined, fn: () => T): T;
    scope(overrides?: GasOverrides): ReadOnlyFlowrAnalyzerGasContext;
    private derive;
    private viewOf;
    private drop;
    private activeScope;
    /**
     * The innermost layer stating this bound wins, the configured thresholds apply when none does.
     * Resolved per bound, so a layer naming only `critical` leaves `problematic` to the layer outside it.
     */
    private bound;
    /** An override naming the feature enables it even when the config disables it. */
    private factorFor;
    private memoryLevel;
    private static maxLevel;
    private timeLevel;
    checkGas(key: string): GasLevel;
    private levelFor;
}