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'use strict';
module.exports = function stringifyFunctionOperators(pipeline) {  if (!Array.isArray(pipeline)) {    return;  }
  for (const stage of pipeline) {    if (stage == null) {      continue;    }
    const canHaveAccumulator = stage.$group || stage.$bucket || stage.$bucketAuto;    if (canHaveAccumulator != null) {      for (const key of Object.keys(canHaveAccumulator)) {        handleAccumulator(canHaveAccumulator[key]);      }    }
    const stageType = Object.keys(stage)[0];    if (stageType && typeof stage[stageType] === 'object') {      const stageOptions = stage[stageType];      for (const key of Object.keys(stageOptions)) {        if (stageOptions[key] != null &&            stageOptions[key].$function != null &&            typeof stageOptions[key].$function.body === 'function') {          stageOptions[key].$function.body = stageOptions[key].$function.body.toString();        }      }    }
    if (stage.$facet != null) {      for (const key of Object.keys(stage.$facet)) {        stringifyFunctionOperators(stage.$facet[key]);      }    }  }};
function handleAccumulator(operator) {  if (operator == null || operator.$accumulator == null) {    return;  }
  for (const key of ['init', 'accumulate', 'merge', 'finalize']) {    if (typeof operator.$accumulator[key] === 'function') {      operator.$accumulator[key] = String(operator.$accumulator[key]);    }  }}