17 lines
543 B
TypeScript
17 lines
543 B
TypeScript
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export type TextDirection = "ltr" | "rtl";
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const RTL_LANGUAGE_PREFIXES = ["ar", "fa", "he", "ur"] as const;
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function primaryLanguageTag(localeTag: string): string {
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const normalized = localeTag.trim().toLowerCase();
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const [primary] = normalized.split(/[-_]/);
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return primary ?? normalized;
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}
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export function textDirectionForLocale(localeTag: string): TextDirection {
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const primary = primaryLanguageTag(localeTag);
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return RTL_LANGUAGE_PREFIXES.includes(primary as (typeof RTL_LANGUAGE_PREFIXES)[number])
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? "rtl"
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: "ltr";
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}
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