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14 lines
450 B
TypeScript
14 lines
450 B
TypeScript
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import * as t from "io-ts";
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import { either } from "fp-ts/lib/Either";
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import { isValidTimezone } from "./isValidTimezone";
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export const tValidTimezone = new t.Type<string, string>(
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"tValidTimezone",
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(s): s is string => typeof s === "string",
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(from, to) =>
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either.chain(t.string.validate(from, to), input => {
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return isValidTimezone(input) ? t.success(input) : t.failure(from, to, `Invalid timezone: ${input}`);
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}),
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s => s,
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);
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