import ts from 'typescript';
import type { FlowStepTransformError } from './transform-error.js';
export interface FlowStepTransformOptions {
    /** Project root — `ref` is derived as `<relative-path>:<symbol>`. */
    readonly projectRoot: string;
    /** Module specifier the injected `__flowStep` import resolves to. */
    readonly runtimeImport: string;
    /** Sink for hard build errors. The transformer never throws. */
    readonly onError: (err: FlowStepTransformError) => void;
}
export declare function createFlowStepTransformer(options: FlowStepTransformOptions): ts.TransformerFactory<ts.SourceFile>;
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