@formatjs/intl-utils is a utility library that provides various internationalization (i18n) utilities. It is part of the FormatJS suite and is designed to help with formatting dates, numbers, and messages in a way that is locale-aware.

What are @formatjs/intl-utils's main functionalities?

Date Formatting

This feature allows you to format dates according to the specified locale and options. The example formats the current date in the 'en-US' locale.

const { formatDate } = require('@formatjs/intl-utils');
const date = new Date();
const formattedDate = formatDate(date, { year: 'numeric', month: 'long', day: 'numeric' }, 'en-US');
console.log(formattedDate); // Output: 'October 5, 2023'

Number Formatting

This feature allows you to format numbers according to the specified locale and options. The example formats a number as a currency in the 'en-US' locale.

const { formatNumber } = require('@formatjs/intl-utils');
const number = 1234567.89;
const formattedNumber = formatNumber(number, { style: 'currency', currency: 'USD' }, 'en-US');
console.log(formattedNumber); // Output: '$1,234,567.89'

Message Formatting

This feature allows you to format messages with placeholders according to the specified locale and values. The example formats a message by replacing the placeholder with a value in the 'en-US' locale.

const { formatMessage } = require('@formatjs/intl-utils');
const message = 'Hello, {name}!';
const values = { name: 'John' };
const formattedMessage = formatMessage(message, values, 'en-US');
console.log(formattedMessage); // Output: 'Hello, John!'

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Readme

Source

Intl Utils

Provide i18n utilities.

API

selectUnit

This function determines the best fit unit based on a specific set of customizable thresholds.

function selectUnit(
  from: Date | number,
  to: Date | number = Date.now(),
  thresholds = DEFAULT_THRESHOLDS
): {value: number; unit: Unit};

where thresholds has the shape of:

interface Threshold {
  second: number;
  minute: number;
  hour: number;
  day: number;
}

month & year are based on calendar, thus not customizable.

Example:

import {selectUnit} from '@formatjs/intl-utils';
selectUnit(Date.now() - 1000); // { value: -1, unit: 'second' }
selectUnit(Date.now() - 44000); // { value: -44, unit: 'second' }
selectUnit(Date.now() - 50000); // { value: 1, unit: 'minute' }

Caveats

selectUnit is meant to be a stepping stone from the old IntlRelativeFormat to the officially spec-ed Intl.RelativeTimeFormat. Therefore we don't recommend using this for an extended period of time because of ambiguous editorial issues such as:

From 2019/01/01 -> 2018/11/01 can technically be last year, 2 months ago or a quarter ago.
From 2019/01/02 6am to 2019/01/01 11pm can also be 7 hours ago or yesterday. Timezone further complicates the issue.

The examples above have not even tackled the differences in non-Gregorian calendars. There is an issue opened upstream in the spec that potentially introduces a best fit algorithm. Therefore, we recommend that you implement your own version of selectUnit that matches your editorial expectation.

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Package last updated on 02 Dec 2019

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