@messageformat/core

Basic Message Formatting

This feature allows you to format basic messages with variable interpolation. The example shows how to create a message template and compile it with a variable.

const { MessageFormat } = require('@messageformat/core');
const mf = new MessageFormat('en');
const message = mf.compile('Hello, {name}!');
console.log(message({ name: 'Alice' })); // Output: Hello, Alice!

Pluralization

This feature supports pluralization based on the count of items. The example demonstrates how to handle singular and plural forms of a word based on the count.

const { MessageFormat } = require('@messageformat/core');
const mf = new MessageFormat('en');
const message = mf.compile('{count, plural, one {# item} other {# items}}');
console.log(message({ count: 1 })); // Output: 1 item
console.log(message({ count: 5 })); // Output: 5 items

Gender Formatting

This feature allows for gender-based message formatting. The example shows how to format messages differently based on the gender of the subject.

const { MessageFormat } = require('@messageformat/core');
const mf = new MessageFormat('en');
const message = mf.compile('{gender, select, male {He} female {She} other {They}} will respond soon.');
console.log(message({ gender: 'male' })); // Output: He will respond soon.
console.log(message({ gender: 'female' })); // Output: She will respond soon.

Custom Formatting

This feature allows you to define custom formatting functions. The example demonstrates how to add a custom formatter that converts text to uppercase.

const { MessageFormat } = require('@messageformat/core');
const mf = new MessageFormat('en');
mf.addFormat('uppercase', (v) => v.toUpperCase());
const message = mf.compile('This is {value, uppercase}');
console.log(message({ value: 'custom' })); // Output: This is CUSTOM