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File Content: index.mjs

/*
  const obj1 = {a: 4, b: 5};
  const obj2 = {a: 3, b: 5};
  const obj3 = {a: 4, c: 5};

diff(obj1, obj2);
  [
    { "op": "replace", "path": ['a'], "value": 3 }
  ]

diff(obj2, obj3);
  [
    { "op": "remove", "path": ['b'] },
    { "op": "replace", "path": ['a'], "value": 4 }
    { "op": "add", "path": ['c'], "value": 5 }
  ]

// using converter to generate jsPatch standard paths
  // see http://jsonpatch.com
  import {diff, jsonPatchPathConverter} from 'just-diff'
  diff(obj1, obj2, jsonPatchPathConverter);
  [
    { "op": "replace", "path": '/a', "value": 3 }
  ]

diff(obj2, obj3, jsonPatchPathConverter);
  [
    { "op": "remove", "path": '/b' },
    { "op": "replace", "path": '/a', "value": 4 }
    { "op": "add", "path": '/c', "value": 5 }
  ]

// arrays
  const obj4 = {a: 4, b: [1, 2, 3]};
  const obj5 = {a: 3, b: [1, 2, 4]};
  const obj6 = {a: 3, b: [1, 2, 4, 5]};

diff(obj4, obj5);
  [
    { "op": "replace", "path": ['a'], "value": 3 }
    { "op": "replace", "path": ['b', 2], "value": 4 }
  ]

diff(obj5, obj6);
  [
    { "op": "add", "path": ['b', 3], "value": 5 }
  ]

// nested paths
  const obj7 = {a: 4, b: {c: 3}};
  const obj8 = {a: 4, b: {c: 4}};
  const obj9 = {a: 5, b: {d: 4}};

diff(obj7, obj8);
  [
    { "op": "replace", "path": ['b', 'c'], "value": 4 }
  ]

diff(obj8, obj9);
  [
    { "op": "replace", "path": ['a'], "value": 5 }
    { "op": "remove", "path": ['b', 'c']}
    { "op": "add", "path": ['b', 'd'], "value": 4 }
  ]
*/

function diff(obj1, obj2, pathConverter) {
  if (!obj1 || typeof obj1 != 'object' || !obj2 || typeof obj2 != 'object') {
    throw new Error('both arguments must be objects or arrays');
  }

pathConverter ||
    (pathConverter = function(arr) {
      return arr;
    });

function getDiff(obj1, obj2, basePath, diffs) {
    var obj1Keys = Object.keys(obj1);
    var obj1KeysLength = obj1Keys.length;
    var obj2Keys = Object.keys(obj2);
    var obj2KeysLength = obj2Keys.length;
    var path;

for (var i = 0; i < obj1KeysLength; i++) {
      var key = Array.isArray(obj1) ? Number(obj1Keys[i]) : obj1Keys[i];
      if (!(key in obj2)) {
        path = basePath.concat(key);
        diffs.remove.push({
          op: 'remove',
          path: pathConverter(path),
        });
      }
    }

for (var i = 0; i < obj2KeysLength; i++) {
      var key = Array.isArray(obj2) ? Number(obj2Keys[i]) : obj2Keys[i];
      var obj1AtKey = obj1[key];
      var obj2AtKey = obj2[key];
      if (!(key in obj1)) {
        path = basePath.concat(key);
        var obj2Value = obj2[key];
        diffs.add.push({
          op: 'add',
          path: pathConverter(path),
          value: obj2Value,
        });
      } else if (obj1AtKey !== obj2AtKey) {
        if (
          Object(obj1AtKey) !== obj1AtKey ||
          Object(obj2AtKey) !== obj2AtKey
        ) {
          path = pushReplace(path, basePath, key, diffs, pathConverter, obj2);
        } else {
          if (
            !Object.keys(obj1AtKey).length &&
            !Object.keys(obj2AtKey).length &&
            String(obj1AtKey) != String(obj2AtKey)
          ) {
            path = pushReplace(path, basePath, key, diffs, pathConverter, obj2);
          } else {
            getDiff(obj1[key], obj2[key], basePath.concat(key), diffs);
          }
        }
      }
    }

return diffs;
  }
  const finalDiffs = getDiff(obj1, obj2, [], {remove: [], replace: [], add: []});
  return finalDiffs.remove
    .reverse()
    .concat(finalDiffs.replace)
    .concat(finalDiffs.add);
}

function pushReplace(path, basePath, key, diffs, pathConverter, obj2) {
  path = basePath.concat(key);
  diffs.replace.push({
    op: 'replace',
    path: pathConverter(path),
    value: obj2[key],
  });
  return path;
}

function jsonPatchPathConverter(arrayPath) {
  return [''].concat(arrayPath).join('/');
}

export {diff, jsonPatchPathConverter};

Name	Size	Permission
LICENSE	1078 bytes	0644
index.d.ts	668 bytes	0644
index.js	3944 bytes	0644
index.mjs	3897 bytes	0644
index.tests.ts	1293 bytes	0644
package.json	767 bytes	0644
rollup.config.js	120 bytes	0644