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rollup-plugin-mock-imports

library1.0.8jsnpmunverified

Rollup plugin (v1.0.8) for mocking ESM imports during bundling, using `__mocks__` directories (like Jest) or a custom `node_mockdules` folder. Designed for pre-compilation testing scenarios (e.g., Svelte components with JSDOM), it intercepts resolved module IDs before other Rollup plugins. Configuration options include `mockall`, `ignore`, and `mock` patterns. Requires Rollup ^0.66.6 as peer dependency. Ships TypeScript types. Release cadence: low (last updated 2019).

testing

npm install rollup-plugin-mock-imports

package ↗

INSTALL

IMPORT

SIG · ROLLUP-PLUGIN-MOCK

rollup-plugin-mock-imports

testingjavascriptv1.0.8

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–223 runs

build_error

glibc

node 18–223 runs

build_error

Code

Verified usage

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

mockImports

✓ import { mockImports } from 'rollup-plugin-mock-imports'

✗ import mockImports from 'rollup-plugin-mock-imports'

Named export, not default. CommonJS require: const { mockImports } = require('rollup-plugin-mock-imports')

Shows basic Rollup config with mockImports placed before other plugins, enabling global mocking with exceptions.

// rollup.config.js import { mockImports } from 'rollup-plugin-mock-imports'; import resolve from 'rollup-plugin-node-resolve'; import commonjs from 'rollup-plugin-commonjs'; export default { input: 'src/main.js', plugins: [ mockImports({ mockall: true, ignore: ['fs', 'path'] }), resolve(), commonjs() ], output: { file: 'dist/bundle.js', format: 'esm' } };

Debug

Known issues

breakingRollup peer dependency is ^0.66.6 – may not work with Rollup >=1.0.0

fix

Use Rollup ^0.66.6 or test compatibility with newer versions; consider forking or updating if needed.

affects: <=1.0.8

gotchamockImports must come before other module resolution plugins (e.g., rollup-plugin-node-resolve) or mocks may be skipped

fix

Place mockImports() first in the plugins array.

affects: all

gotchaMock imports only work for static ES imports; dynamic import() or CommonJS require() are not mocked

fix

Ensure imports are static ESM statements; convert dynamic imports to static or use alternative mocking.

affects: all

gotchaPlugin creates a virtual node_mockdules folder alongside node_modules – name is critical and non-standard

fix

Do not rename the folder; the path is hardcoded relative to node_modules. For custom paths, use nodePath option.

affects: all

Errors

Common errors & fixes

Error: Cannot find module 'rollup'

Rollup is a peer dependency and not installed automatically

fix

npm install --save-dev rollup@^0.66.6

'mockImports' is not exported from 'rollup-plugin-mock-imports'

Default import used instead of named import

fix

Use import { mockImports } from 'rollup-plugin-mock-imports';

Upgrade

Version history

1.0.8latest on npm

Audit

Dependencies

rolluprequiredPeer dependency – plugin is designed for Rollup bundler, requires ^0.66.6

Agent activity

8 hits · last 30 days

node

Resources

packagehttps://www.npmjs.com/package/rollup-plugin-mock-imports ↗