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mapbox-gl

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// @flow /** * A type used for returning and propagating errors. The first element of the union * represents success and contains a value, and the second represents an error and * contains an error value. * @private */ export type Result<T, E> = | {| result: 'success', value: T |} | {| result: 'error', value: E |}; export function success<T, E>(value: T): Result<T, E> { return { result: 'success', value }; } export function error<T, E>(value: E): Result<T, E> { return { result: 'error', value }; }