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assert-never
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Readme
Helper function for exhaustive checks of discriminated unions in TypeScript.
npm install --save assert-never
import {assertNever} from "assert-never";
type A = {type: 'a'};
type B = {type: 'b'};
type Union = A | B;
function doSomething(arg: Union) {
if (arg.type === 'a') {
return something;
}
if (arg.type === 'b') {
return somethingElse;
}
// TS will error if there are other types in the union
// Will throw an Error when called at runtime. Use `assertNever(arg, true)`
// instead to fail silently.
return assertNever(arg);
}
FAQs
Helper function for exhaustive checks of discriminated unions in TypeScript
The npm package assert-never receives a total of 1,707,207 weekly downloads. As such, assert-never popularity was classified as popular.
We found that assert-never demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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Research
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