blend-promise-utils-es5
v1.24.1
Published
Lodash-like utilities for dealing with promises
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blend-promise-utils-es5
This is the ES5 version of the original blend-promise-utils. All tests are passed.
Using this package results in much smaller bundle size compared to the original package because no polyfill except Promise is required! Also an ES Module bundle is included.
promise-utils
Promise-utils is a dependency-free JavaScript/TypeScript library that provides Lodash-like utility functions for dealing with native ES6 promises.
Installation
$ npm install blend-promise-utils
Usage Example
const promiseUtils = require('blend-promise-utils')
const { promises: fs } = require('fs')
const request = require('request-promise-native');
const isEmpty = require('lodash.isempty');
const MS_IN_SECOND = 1000;
async function main() {
const cachedResponse = promiseUtils.memoize(
async (contents) => request(contents.url),
contents => contents.url,
15 * MS_IN_SECOND // contents could change
);
const fileContents = await promiseUtils.map(
['file1', 'file2', 'file3'],
async fileName => {
const rawData = await fs.readFile(fileName);
return JSON.parse(rawData);
},
);
while (true) {
await promiseUtils.delay(150); // avoid slamming CPU
await promiseUtils.mapSeries(
fileContents,
async contents => {
const remoteData = await cachedResponse(contents);
const { results, errors } = await promiseUtils.settleAll([
asyncFunction1(),
asyncFunction2(),
asyncFunction3(),
]);
if (!isEmpty(errors)) {
throw new Error(`Unable to settle all functions: ${JSON.stringify(errors)}`);
} else {
return results;
}
}
)
}
await promiseUtils.retry(flakyFunction, { maxAttempts: 3, delayMs: 150 })(flakyFunctionArgument);
await promiseUtils.timeout(longFunction, 60 * MS_IN_SECOND)(longFunctionArgument);
}
main()
API
Test
$ npm test
Documentation
Build docs
$ make docs
Push docs to Github
$ make push-docs