{"id":22132,"library":"rollup-plugin-mock-imports","title":"rollup-plugin-mock-imports","description":"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).","status":"maintenance","version":"1.0.8","language":"javascript","source_language":"en","source_url":null,"tags":["javascript","typescript"],"install":[{"cmd":"npm install rollup-plugin-mock-imports","lang":"bash","label":"npm"},{"cmd":"yarn add rollup-plugin-mock-imports","lang":"bash","label":"yarn"},{"cmd":"pnpm add rollup-plugin-mock-imports","lang":"bash","label":"pnpm"}],"dependencies":[{"reason":"Peer dependency – plugin is designed for Rollup bundler, requires ^0.66.6","package":"rollup","optional":false}],"imports":[{"note":"Named export, not default. CommonJS require: const { mockImports } = require('rollup-plugin-mock-imports')","wrong":"import mockImports from 'rollup-plugin-mock-imports'","symbol":"mockImports","correct":"import { mockImports } from 'rollup-plugin-mock-imports'"}],"quickstart":{"code":"// rollup.config.js\nimport { mockImports } from 'rollup-plugin-mock-imports';\nimport resolve from 'rollup-plugin-node-resolve';\nimport commonjs from 'rollup-plugin-commonjs';\n\nexport default {\n  input: 'src/main.js',\n  plugins: [\n    mockImports({ mockall: true, ignore: ['fs', 'path'] }),\n    resolve(),\n    commonjs()\n  ],\n  output: { file: 'dist/bundle.js', format: 'esm' }\n};","lang":"javascript","description":"Shows basic Rollup config with mockImports placed before other plugins, enabling global mocking with exceptions."},"warnings":[{"fix":"Use Rollup ^0.66.6 or test compatibility with newer versions; consider forking or updating if needed.","message":"Rollup peer dependency is ^0.66.6 – may not work with Rollup >=1.0.0","severity":"breaking","affected_versions":"<=1.0.8"},{"fix":"Place mockImports() first in the plugins array.","message":"mockImports must come before other module resolution plugins (e.g., rollup-plugin-node-resolve) or mocks may be skipped","severity":"gotcha","affected_versions":"all"},{"fix":"Ensure imports are static ESM statements; convert dynamic imports to static or use alternative mocking.","message":"Mock imports only work for static ES imports; dynamic import() or CommonJS require() are not mocked","severity":"gotcha","affected_versions":"all"},{"fix":"Do not rename the folder; the path is hardcoded relative to node_modules. For custom paths, use nodePath option.","message":"Plugin creates a virtual node_mockdules folder alongside node_modules – name is critical and non-standard","severity":"gotcha","affected_versions":"all"}],"env_vars":null,"search_vec":"'0.66.6':57 '2019':69 'bundl':14 'cadenc':65 'compil':30 'compon':35 'configur':47 'custom':22 'depend':60 'design':26 'directori':17 'e.g':33 'esm':11 'folder':25 'id':42 'ignor':51 'import':5,12 'includ':49 'intercept':39 'javascript':70 'jest':19 'jsdom':37 'last':67 'like':18 'low':66 'mock':4,10,16,53 'mockal':50 'mockdul':24 'modul':41 'node':23 'option':48 'pattern':54 'peer':59 'plugin':3,7,46 'pre':29 'pre-compil':28 'releas':64 'requir':55 'resolv':40 'rollup':2,6,45,56 'rollup-plugin-mock-import':1 'scenario':32 'ship':61 'svelt':34 'test':31 'type':63 'typescript':62,71 'updat':68 'use':15 'v1.0.8':8","created_at":"2026-04-27T17:03:34.057344+00:00","updated_at":"2026-04-27T17:03:34.057344+00:00","problems":[{"fix":"npm install --save-dev rollup@^0.66.6","cause":"Rollup is a peer dependency and not installed automatically","error":"Error: Cannot find module 'rollup'"},{"fix":"Use import { mockImports } from 'rollup-plugin-mock-imports';","cause":"Default import used instead of named import","error":"'mockImports' is not exported from 'rollup-plugin-mock-imports'"}],"ecosystem":"npm","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":"","cli_version":null,"type":"library","homepage":null,"github":null,"docs":null,"changelog":null,"pypi":null,"npm":"https://www.npmjs.com/package/rollup-plugin-mock-imports","openapi_spec":null,"status_page":null,"smithery":null,"categories":["testing"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-18","next_check":"2026-07-26","install_tag":null}}