typed-mapper/dist/index.mjs

Mapping engine which converts from one data structure to another while working with Typescripts generics to allow for strong typing

// src/TypedMapper.ts
var TypedMapper = class {
  _map;
  _aggregate;
  _data;
  _passthrough = false;
  _exclude = false;
  static map(config) {
    const obj = new TypedMapper();
    obj.map(config);
    return obj;
  }
  static passthrough(config) {
    const obj = new TypedMapper();
    obj.passthrough(config);
    return obj;
  }
  static exclude(config) {
    const obj = new TypedMapper();
    obj.exclude(config);
    return obj;
  }
  static aggregate(config) {
    const obj = new TypedMapper();
    obj.aggregate(config);
    return obj;
  }
  get mapConfig() {
    return this._map;
  }
  map(config) {
    this._map = config;
    return this;
  }
  passthrough(config) {
    if (this._exclude) {
      const e = new Error(`You can't set both passthroughs and exclusions and exclusions are already set!`);
      e.name = "TypedMapper::NotAllowed";
      throw e;
    }
    this._passthrough = config;
    return this;
  }
  exclude(config) {
    if (this._passthrough) {
      const e = new Error(`You can't set both passthroughs and exclusions and passthroughs are already set!`);
      e.name = "TypedMapper::NotAllowed";
      throw e;
    }
    this._exclude = config;
    return this;
  }
  input(data) {
    this._data = data;
    return this;
  }
  get inputData() {
    return this._data;
  }
  convert(data) {
    if (data) {
      this.input(data);
    }
    if (!this._data) {
      const e = new Error("You must first set the data before trying to convert!");
      e.name = "TypedMapper::NotReady";
      throw e;
    }
    return Array.isArray(this._data) ? this._convertArray(this._data) : this._convertObject(this._data);
  }
  convertArray(data) {
    if (!data && !Array.isArray(this._data)) {
      const e = new Error(`Using convertArray() requires that the input is also an array and it is of type ${typeof this._data}`);
      e.name = "TypedMapper::InvalidFormat";
      throw e;
    }
    return this.convert(data);
  }
  convertObject(data) {
    if (!data && Array.isArray(this._data)) {
      const e = new Error(`Using convertObject() requires that the input is an object and it is of type ${typeof this._data}`);
      e.name = "TypedMapper::InvalidFormat";
      throw e;
    }
    return this.convert(data);
  }
  _convertObject(data, arr = []) {
    if (!this._map) {
      throw new Error(`Attempt convert an object failed because there was no Mapper defined yet!`);
    }
    const output = {};
    const keys = Object.keys(this._map);
    for (const key of keys) {
      const prop = this._map[key];
      output[key] = typeof prop === "function" ? prop(data, arr) : data[prop];
    }
    if (this._passthrough) {
      const pkeys = Array.isArray(this._passthrough) ? this._passthrough : Object.keys(data);
      for (const key of pkeys) {
        output[key] = data[key];
      }
    }
    if (Array.isArray(this._exclude)) {
      const exclude = new Set(this._exclude);
      const ekeys = Object.keys(data).filter((e) => !exclude.has(e));
      for (const key of ekeys) {
        output[key] = data[key];
      }
    }
    return output;
  }
  _convertArray(data) {
    const output = [];
    for (const datum of data) {
      output.push(this._convertObject(datum));
    }
    return output;
  }
  aggregate(config) {
    if (this._map) {
      const e = new Error('A TypedMapper object should NOT have a "map" and "aggregate" configuration and this object already has a "map" configuration!');
      e.name = "TypedMapper::NotAllowed";
      throw e;
    }
    this._aggregate = config;
    return this;
  }
};

// src/stdNameConversions.ts
function dasherize(name) {
  return name.split(/[_\s\.]/g).map((val) => {
    return val.charAt(0).toLowerCase() + val.substr(1).replace(/([A-Z])/gm, "-$1").toLowerCase();
  }).join("-");
}
function camelize(name) {
  return name.split(/[_\s-\.]/gm).reduce((agg, val) => {
    return agg !== "" ? agg + val.charAt(0).toUpperCase() + val.substr(1) : val.charAt(0).toLowerCase() + val.substr(1);
  }, "");
}
function pascalize(name) {
  return name.split(/[_\s-\.]/gm).reduce((agg, val) => {
    return agg + val.charAt(0).toUpperCase() + val.substr(1);
  }, "");
}

// src/errors/MapperError.ts
import { createError } from "brilliant-errors";
var [MapperError] = createError("MapperError", "typed-mapper")()()()();
export {
  MapperError,
  TypedMapper,
  camelize,
  dasherize,
  pascalize
};