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d2l-fetch-dedupe

library2.1.1jsnpmunverified

A middleware function for de-duplicating fetch requests in the d2l-fetch ecosystem. Version 2.1.1 is the latest. It deduplicates concurrent requests based on url+Authorization header combination, returning a cloned response for duplicate requests. Designed for Brightspace's d2l-fetch library, it is ESM-only and requires a browser environment. Compared to generic dedup patterns, it integrates natively with d2l-fetch's middleware chain.

devops

npm install d2l-fetch-dedupe

package ↗

INSTALL

IMPORT

SIG · D2L-FETCH-DEDUPE

d2l-fetch-dedupe

devopsjavascriptv2.1.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

fetchDedupe

✓ import { fetchDedupe } from 'd2l-fetch-dedupe'

✗ const { fetchDedupe } = require('d2l-fetch-dedupe')

ESM-only package; CJS require will fail. Named export is fetchDedupe.

default import

✓ import { fetchDedupe } from 'd2l-fetch-dedupe'

✗ import fetchDedupe from 'd2l-fetch-dedupe'

There is no default export; must use named import.

d2lFetch.use

✓ d2lfetch.use({name: 'dedupe', fn: fetchDedupe})

✗ d2lfetch.use(fetchDedupe)

The middleware must be passed as an object with `name` and `fn` properties to d2lFetch.use().

Registers dedupe middleware, then makes two concurrent fetch calls to same URL+auth to demonstrate deduplication.

import d2lfetch from 'd2l-fetch'; import { fetchDedupe } from 'd2l-fetch-dedupe'; // Register the dedupe middleware d2lfetch.use({name: 'dedupe', fn: fetchDedupe}); // Make two concurrent requests to the same URL with same auth const request = new Request('https://api.example.com/data', { headers: { Authorization: 'Bearer token123' } }); const [response1, response2] = await Promise.all([ d2lfetch.fetch(request.clone()), d2lfetch.fetch(request.clone()) ]); console.log(await response1.text(), await response2.text()); // Both succeed, but only one network request

Debug

Known issues

breakingd2l-fetch-dedupe is ESM-only. require() will throw an error.

fix

Use import syntax or ensure your environment supports ES modules.

affects: >=2.0.0

gotchaDeduplication key is url+Authorization header only. Other headers are ignored.

fix

Ensure requests that should be separate have different URLs or Authorization headers.

affects: >=1.0.0

gotchaThe middleware must be registered before making requests; it won't deduplicate requests made before registration.

fix

Call d2lfetch.use({name:'dedupe', fn: fetchDedupe}) before any fetch calls.

affects: >=1.0.0

Errors

Common errors & fixes

Error [ERR_REQUIRE_ESM]: require() of ES Module

Using CommonJS require() to import an ESM-only package in Node.js < v12 or without experimental modules.

fix

Switch to import statement or set type: module in package.json.

TypeError: d2lfetch.use is not a function

d2l-fetch is not properly initialized or the d2lfetch object is undefined.

fix

Ensure d2l-fetch is correctly imported and d2lfetch is the export from d2l-fetch.

TypeError: fetchDedupe is not a function

Importing incorrectly (e.g., default import instead of named).

fix

Use `import { fetchDedupe } from 'd2l-fetch-dedupe'`.

Upgrade

Version history

2.1.1latest on npm

Audit

Dependencies

d2l-fetchrequiredPeer dependency; middleware is designed to be used with d2l-fetch's `use` method

Agent activity

9 hits · last 30 days

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Resources

packaged2l-fetch-dedupe ↗