@lodestar/api
Version:
A Typescript REST client for the Ethereum Consensus API
68 lines • 2.3 kB
JavaScript
/**
* Native fetch with transparent and consistent error handling
*
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/fetch)
*/
async function wrappedFetch(url, init) {
try {
// This function wraps global `fetch` which should only be directly called here
// biome-ignore lint/style/noRestrictedGlobals: <explanation>
return await fetch(url, init);
}
catch (e) {
throw new FetchError(url, e);
}
}
export { wrappedFetch as fetch };
export function isFetchError(e) {
return e instanceof FetchError;
}
export class FetchError extends Error {
constructor(url, e) {
if (isNativeFetchFailedError(e)) {
super(`Request to ${url.toString()} failed, reason: ${e.cause.message}`);
this.type = "failed";
this.code = e.cause.code || "ERR_FETCH_FAILED";
this.cause = e.cause;
}
else if (isNativeFetchInputError(e)) {
// For input errors the e.message is more detailed
super(e.message);
this.type = "input";
this.code = e.cause.code || "ERR_INVALID_INPUT";
this.cause = e.cause;
}
else if (isNativeFetchAbortError(e)) {
super(`Request to ${url.toString()} was aborted`);
this.type = "aborted";
this.code = "ERR_ABORTED";
}
else if (isNativeFetchTimeoutError(e)) {
super(`Request to ${url.toString()} timed out`);
this.type = "timeout";
this.code = "ERR_TIMEOUT";
}
else {
super(e.message);
this.type = "unknown";
this.code = "ERR_UNKNOWN";
}
this.name = this.constructor.name;
}
}
function isNativeFetchError(e) {
return e instanceof TypeError && e.cause instanceof Error;
}
function isNativeFetchFailedError(e) {
return isNativeFetchError(e) && e.message === "fetch failed";
}
function isNativeFetchInputError(e) {
return isNativeFetchError(e) && e.cause.input !== undefined;
}
function isNativeFetchAbortError(e) {
return e instanceof DOMException && e.name === "AbortError";
}
function isNativeFetchTimeoutError(e) {
return e instanceof DOMException && e.name === "TimeoutError";
}
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