@barchart/common-js/dist/cjs/lang/Timezones.js

Library of common JavaScript utilities

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var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var Timezones_exports = {};
__export(Timezones_exports, {
  default: () => Timezones
});
module.exports = __toCommonJS(Timezones_exports);
var assert = __toESM(require("./assert.js"));
var is = __toESM(require("./is.js"));
var timezone = __toESM(require("./timezone.js"));
var import_Enum = __toESM(require("./Enum.js"));
var import_tz = require("@date-fns/tz");
class Timezones extends import_Enum.default {
  /**
   * @param {string} code - The timezone name.
   */
  constructor(code) {
    super(code, code);
  }
  /**
   * Attempts to determine whether daylight saving time is in effect.
   *
   * @public
   * @param {number=} timestamp - The moment at which daylight saving time is checked; otherwise, the current time is used.
   * @returns {boolean}
   */
  getIsDaylightSavingsTime(timestamp) {
    assert.argumentIsOptional(timestamp, "timestamp", Number);
    const now = /* @__PURE__ */ new Date();
    let baseline = Date.UTC(now.getFullYear(), 0, 1);
    let candidate;
    if (timestamp) {
      candidate = timestamp;
    } else {
      candidate = now.getTime();
    }
    const baselineOffset = this.getUtcOffset(baseline);
    const candidateOffset = this.getUtcOffset(candidate);
    return baselineOffset !== candidateOffset;
  }
  /**
   * Calculates and returns the offset of a timezone from UTC.
   *
   * @public
   * @param {number=} timestamp - The moment at which the offset is calculated; otherwise, the current time is used.
   * @param {boolean=} milliseconds - Whether the offset should be returned in milliseconds instead of minutes.
   * @returns {number}
   */
  getUtcOffset(timestamp, milliseconds) {
    assert.argumentIsOptional(timestamp, "timestamp", Number);
    assert.argumentIsOptional(milliseconds, "milliseconds", Boolean);
    let timestampToUse;
    if (is.number(timestamp)) {
      timestampToUse = timestamp;
    } else {
      timestampToUse = (/* @__PURE__ */ new Date()).getTime();
    }
    let multiplier;
    if (is.boolean(milliseconds) && milliseconds) {
      multiplier = 60 * 1e3;
    } else {
      multiplier = 1;
    }
    return (0, import_tz.tzOffset)(this.code, new Date(timestampToUse)) * multiplier;
  }
  /**
   * Given a code, returns the corresponding enumeration item.
   *
   * @public
   * @static
   * @param {string} code
   * @returns {Timezones|null}
   */
  static parse(code) {
    const value = import_Enum.default.fromCode(Timezones, code);
    return value instanceof Timezones ? value : null;
  }
  /**
   * UTC.
   *
   * @public
   * @static
   * @returns {Timezones}
   */
  static get UTC() {
    return utc;
  }
  /**
   * America/Chicago.
   *
   * @public
   * @static
   * @returns {Timezones}
   */
  static get AMERICA_CHICAGO() {
    return america_chicago;
  }
  /**
   * America/New_York.
   *
   * @public
   * @static
   * @returns {Timezones}
   */
  static get AMERICA_NEW_YORK() {
    return america_new_york;
  }
  /**
   * America/Denver.
   *
   * @public
   * @static
   * @returns {Timezones}
   */
  static get AMERICA_DENVER() {
    return america_denver;
  }
  /**
   * Returns a string representation.
   *
   * @public
   * @returns {string}
   */
  toString() {
    return `[Timezone (name=${this.code})]`;
  }
}
timezone.getTimezones().forEach((name) => {
  new Timezones(name);
});
const utc = getRequiredTimezone("UTC");
const america_chicago = getRequiredTimezone("America/Chicago");
const america_new_york = getRequiredTimezone("America/New_York");
const america_denver = getRequiredTimezone("America/Denver");
function getRequiredTimezone(code) {
  const value = Timezones.parse(code);
  if (value === null) {
    throw new Error(`Timezone "${code}" is not registered.`);
  }
  return value;
}

{
	const cjsExports = module.exports;
	const cjsDefaultExport = cjsExports && cjsExports.__esModule ? cjsExports.default : cjsExports;

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			if (key !== 'default' && key !== '__esModule') {
				cjsDefaultExport[key] = cjsExports[key];
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	}

	module.exports = cjsDefaultExport;
}