import type { Expr, Pipeline } from "./ast.ts";
import { type GenerateCtx } from "./codegen.ts";
export declare function isPipelineAst(ast: Expr): boolean;
type ContainerKind = "top" | "facet" | "lookup" | "unionWith";
/**
 * Compile a pipeline-shaped ArrayLiteral AST to an MQL pipeline (stage array).
 *
 * Caller must have verified `isPipelineAst(ast)` first; we still validate
 * every element here and throw a precise CodegenError on the first non-stage
 * element so the error message points at the offending position.
 *
 * Consecutive update op elements (`$.a = 1`, `delete $.x`) coalesce through
 * the same algorithm `jsmql()` uses at the top level — see
 * `generateUpdateOpGroups` in codegen.ts. Non-update op stages flush the
 * current update op buffer and emit its compiled $set/$unset stage(s) inline.
 *
 * `let` bindings extend a pipeline-scoped GenerateCtx that downstream stages
 * inherit; reshape-clearing stages drop the scope; a trailing `$unset` is
 * appended once if any let was declared.
 */
export declare function generatePipeline(ast: Expr, startCtx?: GenerateCtx): unknown[];
/**
 * Compile a `Pipeline` (a sequence of `;`-separated top-level statements) to
 * an MQL stage array. Each statement is lowered in isolation: a update op
 * chain (`,`-grouped, possibly RAW-split) goes through `generateUpdateFilter`
 * and contributes one or more `$set`/`$unset` stages; an expression must be a
 * stage call/object and contributes exactly one stage.
 *
 * Adjacent update op statements never coalesce — `;` is a hard boundary, in
 * contrast to `generatePipeline` (the `[…]` form), where consecutive
 * update op elements coalesce through `generateUpdateOpGroups`. This is the
 * core difference between the two pipeline forms.
 *
 * `let` declarations contribute one `$set` stage each and extend the let
 * scope visible to subsequent statements.
 */
export declare function generateImplicitPipeline(p: Pipeline, startCtx?: GenerateCtx, container?: ContainerKind): unknown[];
export {};
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