Module language

BCP 47 language tags and RFC 4647 basic language ranges.

Provides types and utilities for working with BCP 47 language tags (Tag) and RFC 4647 basic language ranges (TagRange). Use isTag and isTagRange as type guards, and matchTag to test tags against range patterns.

Language Tags

import { isTag } from "@metreeca/core/language";

if (isTag(value)) {
  // value is typed as Tag
}
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Basic Language Ranges

import { isTagRange } from "@metreeca/core/language";

if (isTagRange(value)) {
  // value is typed as TagRange
}
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Matching

import { matchTag } from "@metreeca/core/language";

matchTag("de-CH", "de");  // true - Swiss German matches German range
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