/**
 * A free variable is resolved according to a resolution rule:
 *
 * 1. Strict resolution
 * 2. Namespaced resolution
 */
import type { GetContextualFreeOpcode } from '@glimmer/interfaces';
import type { FreeVarNamespace } from './constants';
import { COMPONENT_VAR_NS, HELPER_VAR_NS, MODIFIER_VAR_NS } from './constants';
/**
 * Strict resolution is used:
 *
 * 1. in a strict mode template
 * 2. in an local variable invocation with dot paths
 */
export declare const STRICT_RESOLUTION: {
    resolution: () => GetContextualFreeOpcode;
    serialize: () => SerializedResolution;
    isAngleBracket: false;
};
export type StrictResolution = typeof STRICT_RESOLUTION;
export declare const HTML_RESOLUTION: {
    isAngleBracket: true;
    resolution: () => GetContextualFreeOpcode;
    serialize: () => SerializedResolution;
};
export type HtmlResolution = typeof HTML_RESOLUTION;
export declare function isStrictResolution(value: unknown): value is StrictResolution;
/**
 * A `LooseModeResolution` includes one or more namespaces to resolve the variable in
 *
 * In practice, there are a limited number of possible combinations of these degrees of freedom,
 * and they are captured by the `Namespaces` union below.
 */
export declare class LooseModeResolution {
    readonly namespaces: Namespaces;
    readonly isAngleBracket: boolean;
    /**
     * Namespaced resolution is used in an unambiguous syntax position:
     *
     * 1. `(sexp)` (namespace: `Helper`)
     * 2. `{{#block}}` (namespace: `Component`)
     * 3. `<a {{modifier}}>` (namespace: `Modifier`)
     * 4. `<Component />` (namespace: `Component`)
     */
    static namespaced(namespace: FreeVarNamespace, isAngleBracket?: boolean): LooseModeResolution;
    /**
     * Append resolution is used when the variable should be resolved in both the `component` and
     * `helper` namespaces.
     *
     * ```hbs
     * {{x}}
     * ```
     *
     * ```hbs
     * {{x y}}
     * ```
     *
     * ^ In either case, `x` should be resolved in the `component` and `helper` namespaces.
     */
    static append(): LooseModeResolution;
    /**
     * Trusting append resolution is used when the variable should be resolved only in the
     * `helper` namespaces.
     *
     * ```hbs
     * {{{x}}}
     * ```
     *
     * ```hbs
     * {{{x y}}}
     * ```
     *
     * ^ In either case, `x` should be resolved in the `helper` namespace.
     */
    static trustingAppend(): LooseModeResolution;
    constructor(namespaces: Namespaces, isAngleBracket?: boolean);
    resolution(): GetContextualFreeOpcode;
    serialize(): SerializedResolution;
}
export declare const HELPER_NAMESPACE: "Helper";
export declare const MODIFIER_NAMESPACE: "Modifier";
export declare const COMPONENT_NAMESPACE: "Component";
/**
 * A `Namespaced` must be resolved in one or more namespaces.
 *
 * ```hbs
 * <X />
 * ```
 *
 * ^ `X` is resolved in the `component` namespace
 *
 * ```hbs
 * (x)
 * ```
 *
 * ^ `x` is resolved in the `helper` namespace
 *
 * ```hbs
 * <a {{x}} />
 * ```
 *
 * ^ `x` is resolved in the `modifier` namespace
 */
type Namespaces = [HELPER_VAR_NS] | [MODIFIER_VAR_NS] | [COMPONENT_VAR_NS] | [COMPONENT_VAR_NS, HELPER_VAR_NS];
export type FreeVarResolution = StrictResolution | HtmlResolution | LooseModeResolution;
export type SerializedResolution = 'Strict' | 'Helper' | 'Modifier' | 'Component' | 'ComponentOrHelper';
export declare function loadResolution(resolution: SerializedResolution): FreeVarResolution;
export {};