/**
 * Main boolean-condition lowering (toBooleanConditionAst, emitBooleanConditionAst)
 *
 * In TypeScript, any value can be used in a boolean context (truthy/falsy).
 * In C#, only boolean expressions are valid conditions (if/while/for/?:/!).
 *
 * This module provides the main boolean-condition lowering functions
 * that dispatch to appropriate truthiness checks based on type.
 *
 * IMPORTANT:
 * - This operates on IR + emitted AST; it must not import emitExpressionAst to avoid cycles.
 * - Callers provide an emit function.
 */
import type { IrExpression } from "@tsonic/frontend";
import type { EmitterContext } from "../../types.js";
import type { CSharpExpressionAst } from "../format/backend-ast/types.js";
export type EmitExprAstFn = (expr: IrExpression, context: EmitterContext) => [CSharpExpressionAst, EmitterContext];
/**
 * Convert an expression to a valid C# boolean condition, returning a typed AST node.
 *
 * Rules (deterministic):
 * - Booleans: use as-is
 * - Reference types (objects, arrays, dictionaries, unions, ...): runtime truthiness
 * - Strings: `!string.IsNullOrEmpty(expr)`
 * - Numbers: JS truthiness check: false iff 0 or NaN
 * - int: `expr != 0`
 * - char: `expr != '\0'`
 * - null/undefined literals: `false`
 */
export declare const toBooleanConditionAst: (expr: IrExpression, emittedAst: CSharpExpressionAst, context: EmitterContext) => [CSharpExpressionAst, EmitterContext];
/**
 * Emit a boolean-context expression as a typed AST node.
 *
 * Special-cases logical &&/|| into proper binaryExpression AST nodes
 * with printer-handled parenthesization.
 */
export declare const emitBooleanConditionAst: (expr: IrExpression, emitExprAst: EmitExprAstFn, context: EmitterContext) => [CSharpExpressionAst, EmitterContext];
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