mathjs/src/json/reviver.js

'use strict'

function factory (type, config, load, typed, math) {
  /**
   * Instantiate mathjs data types from their JSON representation
   * @param {string} key
   * @param {*} value
   * @returns {*} Returns the revived object
   */
  return function reviver (key, value) {
    const constructor = type[value && value.mathjs] ||
        (math.expression && math.expression.node[value && value.mathjs])
    // TODO: instead of checking math.expression.node, expose all Node classes on math.type too

    if (constructor && typeof constructor.fromJSON === 'function') {
      return constructor.fromJSON(value)
    }

    return value
  }
}

exports.name = 'reviver'
exports.path = 'json'
exports.factory = factory
exports.math = true // request the math namespace as fifth argument