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john-osullivan/isSuccessResponse.ts

Last active September 16, 2019 16:53
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Dev Diaries #2 - Sample Type Guard
Raw
isSuccessResponse.ts
/**
* Type guard; only returns `true` if object shape has a non-null
* `data` value and `err` has a null value.
* @param val
*/
export function isSuccessResponse(val:any): val is SuccessResponse {
return (
isObject(val) &&
val.data &&
val.err === null
)
}
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