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var isValueProperty = !Number.isNaN(parseInt(enumMember, 10));

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/**
 * Sample from stack overflow.
 * @see https://stackoverflow.com/a/18112157
 */
function getValues(enumType: object) {
  for (var enumMember in enumType) {
    var isValueProperty = parseInt(enumMember, 10) >= 0
    if (isValueProperty) {
      console.log("enum member: ", enumType[enumMember]);
    }

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enum Names {
  Alex = 0,
  Denis = -1
}

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/**
* Get values from enumeration.
*/
public static values(enumType: object) {
  return EnumHelpers.toKeyValueArray(enumType).map(kv => kv.value);
}

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/**
* Get key-value array from enumeration.
*/
public static toKeyValueArray(enumType: object) {
  return EnumHelpers.keys(enumType).map(key => ({ key, value: enumType[key] }));
}

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class EnumHelpers {
  /**
  * No instances guard.
  */
  private constructor() { }

  /**
  * Get all keys from enumeration.
  */
  public static keys(enumType: object) {

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var Names = {
  "0": "Alex",
  "1": "Denis",
  "Alex": 0,
  "Denis": 1
};

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/*
  No step. Only for example.
  This is function will be created at run-time in memory really.
*/
function selfInvokable(enumType) {
  // step 3: enumType["Alex"] = 0;
  // step 4: enumType[enumType["Alex"]] = "Alex";
  // step 5: enumType["Alex"] = 1;
  // step 6: enumType[enumType["Denis"]] = "Denis";
}<br />

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var Names;
(function (Names) {
  Names[Names["Alex"] = 0] = "Alex";
  Names[Names["Denis"] = 1] = "Denis";
})(Names || (Names = {}));

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/*
 You can skip values initialization into enum definition.
 TypeScript use it as default enum declaration.
*/
enum Names {
  Alex = 0,
  Denis = 1
}