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export function nullIfUndefined<T>(value: T | undefined): T | null {
return value === undefined ? null : value;
}
export function throwIfNullOrUndefined<T>(value: T | null | undefined,
message: string | (() => string) = 'Value mustn\'t be null or undefined'): T | never {
if (value === null || value === undefined) {
throw new Error(typeof message === 'string' ? message : message());
} else {
return value;
}
}
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