memoized-node-fetch
Version:
A wrapper around node-fetch that caches the request's promise before resolving.
42 lines • 1.86 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const node_fetch_1 = __importDefault(require("node-fetch"));
const hasher_1 = __importDefault(require("./hasher"));
function memoizedNodeFetchFactory(fetchFunction = node_fetch_1.default) {
const promiseCache = new Map();
function wrapper(key, promise) {
return __awaiter(this, void 0, void 0, function* () {
try {
yield promise;
}
finally {
promiseCache.delete(key);
}
return promise;
});
}
function wrappedFetch(url, options, hashFunction = hasher_1.default) {
const key = hashFunction(url, options);
if (promiseCache.has(key)) {
return promiseCache.get(key);
}
const promise = wrapper(key, fetchFunction(url, options));
promiseCache.set(key, promise);
return promise;
}
return wrappedFetch;
}
exports.default = memoizedNodeFetchFactory;
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