Lazy reduce an Asynchronous Stream of Promise. This module may help to enhance memory usage when there is a need to deal with a high amount of Promises.
- Node.js v12 or higher
This package is available in the Node Package Repository and can be easily installed with npm or yarn.
$ npm i @slimio/lazy-promise-reducer
# or
$ yarn add @slimio/lazy-promise-reducer"use strict";
const { stat, readdir } = require("fs").promises;
const { extname, join } = require("path");
const LazyPromiseReducer = require("lazy-promise-reducer");
async function* fetchFiles(directoryLocation) {
const dirents = await readdir(directoryLocation, { withFileTypes: true });
for (const dirent of dirents) {
const fullDirentPath = join(directoryLocation, dirent.name);
yield fullDirentPath;
if (dirent.isDirectory()) yield* fetchFiles(fullDirentPath);
}
}
async function getDirectorySize(dir) {
const root = await stat(dir);
if (!root.isDirectory()) throw new Error("dir must be a directory!");
const asyncFileSizeReducer = await (new LazyPromiseReducer(stat)
.reduce((prev, curr) => prev + curr.size, root.size))
.fromAsyncIterable(fetchFiles(dir))
return asyncFileSizeReducer.getReducedValue();
}TBC
MIT