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import {SignalRef} from 'vega';import {signalRefOrValue} from './compile/common';import {keys} from './util';import {isSignalRef} from './vega.schema';
export interface ExprRef {  /**   * Vega expression (which can refer to Vega-Lite parameters).   */  expr: string;}
export function isExprRef(o: any): o is ExprRef {  return o && !!o['expr'];}
export function isExprOrSignalRef(o: any): o is ExprRef | SignalRef {  return isExprRef(o) || isSignalRef(o);}
export type ExprOrSignalRef = ExprRef | SignalRef;
export function replaceExprRefInIndex(index: {[key: string]: any | ExprOrSignalRef}) {  const props = keys(index || {});  const newIndex: {[key: string]: any | SignalRef} = {};  for (const prop of props) {    newIndex[prop as any] = signalRefOrValue(index[prop]);  }  return newIndex;}