wretch
Version:
A tiny wrapper built around fetch with an intuitive syntax.
47 lines • 1.66 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.dedupe = void 0;
/* Defaults */
const defaultSkip = (_, opts) => (opts.skipDedupe || opts.method !== "GET");
const defaultKey = (url, opts) => opts.method + "@" + url;
const defaultResolver = response => response.clone();
const dedupe = ({ skip = defaultSkip, key = defaultKey, resolver = defaultResolver } = {}) => {
const inflight = new Map();
return next => (url, opts) => {
if (skip(url, opts)) {
return next(url, opts);
}
const _key = key(url, opts);
if (!inflight.has(_key)) {
inflight.set(_key, []);
}
else {
return new Promise((resolve, reject) => {
inflight.get(_key).push([resolve, reject]);
});
}
try {
return next(url, opts)
.then(response => {
// Resolve pending promises
inflight.get(_key).forEach(([resolve]) => resolve(resolver(response)));
// Remove the inflight pending promises
inflight.delete(_key);
// Return the original response
return response;
})
.catch(error => {
// Reject pending promises on error
inflight.get(_key).forEach(([, reject]) => reject(error));
inflight.delete(_key);
throw error;
});
}
catch (error) {
inflight.delete(_key);
return Promise.reject(error);
}
};
};
exports.dedupe = dedupe;
//# sourceMappingURL=dedupe.js.map