/**
 * Pipeline template expression engine.
 *
 * Supports: ${{ args.xxx }}, ${{ last }}, ${{ outputs.0 }}, ${{ vars.name }},
 * ${{ error.message }} and simple pipe filters.
 * Does NOT execute arbitrary JavaScript — only whitelisted expressions.
 */
export interface TemplateContext {
    args: Record<string, unknown>;
    last: unknown;
    outputs: unknown[];
    vars: Record<string, unknown>;
    error?: {
        code?: string;
        message?: string;
    };
}
export declare function resolvePath(obj: unknown, path: string): unknown;
export declare function isTruthyValue(value: unknown): boolean;
export declare function valueContains(actual: unknown, expected: unknown): boolean;
export declare function evaluateRawExpression(expr: string, ctx: TemplateContext): unknown;
/**
 * Resolve all `${{ ... }}` expressions in a string.
 */
export declare function resolveTemplate(template: string, ctx: TemplateContext): string;
export declare function resolveTemplateValue(value: string, ctx: TemplateContext): unknown;
/**
 * Deep-resolve templates in an object/array/string value.
 */
export declare function resolveTemplateDeep(value: unknown, ctx: TemplateContext): unknown;