FrontEnd/src/common.ts


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import { TFunction } from "i18next";

// This error is thrown when ui goes wrong with bad logic.
// Such as a variable should not be null, but it does.
// This error should never occur. If it does, it indicates there is some logic bug in codes.
export class UiLogicError extends Error {}

export type I18nText =
  | string
  | { type: "custom"; value: string }
  | { type: "i18n"; value: string };

export function convertI18nText(text: I18nText, t: TFunction): string;
export function convertI18nText(
  text: I18nText | null | undefined,
  t: TFunction
): string | null;
export function convertI18nText(
  text: I18nText | null | undefined,
  t: TFunction
): string | null {
  if (text == null) {
    return null;
  } else if (typeof text === "string") {
    return t(text);
  } else if (text.type === "i18n") {
    return t(text.value);
  } else {
    return text.value;
  }
}