/** Slice 0.9 — TypeScript-AST helper split out of `assignment-operators.ts`.
 *
 *  `supportedCompoundAssignmentOperator` maps a `ts.SyntaxKind` token to a KERN
 *  compound-assignment operator. It is the ONLY assignment-operator helper that
 *  depends on `typescript`, so it lives here (the Node/codegen side) rather than
 *  in `assignment-operators.ts`. That keeps `assignment-operators.ts` — and the
 *  `@kernlang/core` barrel that re-exports its string predicates — free of the
 *  `typescript` import (R1 barrel-isolation). Reachable only via the Node subpath
 *  (`@kernlang/core/node`) or direct module import. */
import ts from 'typescript';
import type { SupportedAssignOperator } from './generated/utils/assignment-operators.js';
export declare function supportedCompoundAssignmentOperator(kind: ts.SyntaxKind): SupportedAssignOperator | null;