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const _ = require('lodash');

const dotty = require('dotty');

function toArrayWithArrays(arr) {

if (_.isArray(arr)) return arr;

return _.map(arr, (value, key) => {

if (value.name && value.app) return value;

if (value.name && !value.app) {

value.app = value.name;

return value;

}

if (value.app && !value.name) {

value.name = value.app;

return value;

}

value.name = key;

value.app = key;

return value;

});

}

module.exports = (from, to, by) => {

return (ctx) => {

const clone = _.cloneDeep(ctx);

const fromCtx = toArrayWithArrays(dotty.get(clone, from));

const toCtx = toArrayWithArrays(dotty.get(clone, to));

const diff = _.differenceBy(fromCtx, toCtx, by) || [];

return diff;

};