basant307/AI_Governance_Project

1/**2 * @license3 * Copyright 2025 Google LLC4 * SPDX-License-Identifier: Apache-2.05 */6 7import { MergeStrategy } from '../config/settingsSchema.js';8 9export type Mergeable =10  | string11  | number12  | boolean13  | null14  | undefined15  | object16  | Mergeable[];17 18export type MergeableObject = Record<string, Mergeable>;19 20function isPlainObject(item: unknown): item is MergeableObject {21  return !!item && typeof item === 'object' && !Array.isArray(item);22}23 24function mergeRecursively(25  target: MergeableObject,26  source: MergeableObject,27  getMergeStrategyForPath: (path: string[]) => MergeStrategy | undefined,28  path: string[] = [],29) {30  for (const key of Object.keys(source)) {31    if (key === '__proto__' || key === 'constructor' || key === 'prototype') {32      continue;33    }34    const newPath = [...path, key];35    const srcValue = source[key];36    const objValue = target[key];37    const mergeStrategy = getMergeStrategyForPath(newPath);38 39    if (mergeStrategy === MergeStrategy.SHALLOW_MERGE && objValue && srcValue) {40      const obj1 =41        typeof objValue === 'object' && objValue !== null ? objValue : {};42      const obj2 =43        typeof srcValue === 'object' && srcValue !== null ? srcValue : {};44      target[key] = { ...obj1, ...obj2 };45      continue;46    }47 48    if (Array.isArray(objValue)) {49      const srcArray = Array.isArray(srcValue) ? srcValue : [srcValue];50      if (mergeStrategy === MergeStrategy.CONCAT) {51        target[key] = objValue.concat(srcArray);52        continue;53      }54      if (mergeStrategy === MergeStrategy.UNION) {55        target[key] = [...new Set(objValue.concat(srcArray))];56        continue;57      }58    }59 60    if (isPlainObject(objValue) && isPlainObject(srcValue)) {61      mergeRecursively(objValue, srcValue, getMergeStrategyForPath, newPath);62    } else if (isPlainObject(srcValue)) {63      target[key] = {};64      mergeRecursively(65        target[key] as MergeableObject,66        srcValue,67        getMergeStrategyForPath,68        newPath,69      );70    } else {71      target[key] = srcValue;72    }73  }74  return target;75}76 77export function customDeepMerge(78  getMergeStrategyForPath: (path: string[]) => MergeStrategy | undefined,79  ...sources: MergeableObject[]80): MergeableObject {81  const result: MergeableObject = {};82 83  for (const source of sources) {84    if (source) {85      mergeRecursively(result, source, getMergeStrategyForPath);86    }87  }88 89  return result;90}91