typed-utilities/build/deepTransform.js

Strongly typed general purpose utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.deepTransform = void 0;

var _id = require("./id");

const deepTransform = (input, transform, // eslint-disable-next-line @typescript-eslint/ban-types
skipVisitConstructors = [Date, Uint8Array], state = {
  inputTransformed: false,
  backReferences: new WeakSet()
}) => {
  const transformKey = transform.key ?? _id.id;
  const transformValue = transform.value ?? _id.id;

  if (typeof input !== `object` || input === null) {
    return transformValue(input);
  }

  if (state.backReferences.has(input)) {
    throw new Error(`circular reference`);
  }

  if (!state.inputTransformed) {
    return deepTransform(transformValue(input), transform, skipVisitConstructors, { ...state,
      inputTransformed: true
    });
  }

  state.backReferences.add(input);

  if (skipVisitConstructors.some(type => input instanceof type)) {
    return input;
  }

  if (Array.isArray(input)) {
    return input.map(item => deepTransform(item, transform, skipVisitConstructors, { ...state,
      inputTransformed: false
    }));
  }

  return Object.assign(Object.create(Object.getPrototypeOf(input)), Object.fromEntries(Object.entries(input).map(([key, value]) => [transformKey(key), deepTransform(value, transform, skipVisitConstructors, { ...state,
    inputTransformed: false
  })])));
};

exports.deepTransform = deepTransform;
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