Utility for combining several permits into one
npm install promise-deduplicate
``shell`
npm install promise-deduplicate
For yarnshell`
yarn add promise-deduplicate
typescript
import { PromisesDeduplicate } from 'promise-deduplicate';// Create deduplicator instance
const deduplicate = new PromisesDeduplicate();
let counter = 0
// Asynchronous function we want to deduplicated
async function fetchData(): Promise {
// Imitation of an asynchronous request
return new Promise((resolve) => {
setTimeout(() => resolve(++counter), 1000);
});
}
// Using
async function main() {
const id = '123';
// The first challenge - will begin execution
const promise1 = deduplicate.handle(id, () => fetchData());
// The second challenge with the same key - will return the same Promise
const promise2 = deduplicate.handle(id, () => fetchData());
// We expect the end
const result1 = await promise1;
const result2 = await promise2;
console.log(result1); // 1
console.log(result2); // 1
}
main();
`$3
typescript
import { PromisesDeduplicate } from 'promise-deduplicate';const deduplicate = new PromisesDeduplicate();
let counter = 0
async function fetchData(): Promise {
return new Promise((resolve) => {
setTimeout(() => resolve(++counter), 1000);
});
}
async function main() {
const id1 = '123';
const id2 = '456';
// First call for ID1
const promise1 = deduplicate.handle(id1, () => fetchData());
// First call for ID2
const promise2 = deduplicate.handle(id2, () => fetchData());
// We expect the end
const result1 = await promise1;
const result2 = await promise2;
console.log(result1); // 1
console.log(result2); // 2
}
main();
``If you have questions or suggestions, create issue