Registry / web-framework / copy-asset-in-memory-webpack-plugin

copy-asset-in-memory-webpack-plugin

library4.0.1jsnpmunverified

Webpack 5 plugin to copy processed assets while the compilation is still in memory, before they are written to disk. Version 4.0.1 is the latest stable, with a history of breaking changes aligning with webpack 5. It allows filtering by test/include/exclude, renaming via `to`, transforming content, and optionally deleting original assets. Unlike copy-webpack-plugin which copies from filesystem to output, this plugin copies assets already in webpack's compilation graph. Requires webpack ^5.20.0 and Node >=12.13. Ships TypeScript types.

web-framework

npm install copy-asset-in-memory-webpack-plugin

github ↗package ↗

INSTALL

IMPORT

SIG · COPY-ASSET-IN-MEMO

copy-asset-in-memory-webpack-plugin

web-frameworkjavascriptv4.0.1

Install

—

Import

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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 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

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

CopyAssetInMemoryPlugin

✓ const CopyAssetInMemoryPlugin = require('copy-asset-in-memory-webpack-plugin');

✗ import CopyAssetInMemoryPlugin from 'copy-asset-in-memory-webpack-plugin';

This package does not export an ESM default; use CommonJS require in webpack config. For ESM usage, use dynamic import or convert config to .mjs with createRequire.

CopyAssetInMemoryPlugin

✓ import CopyAssetInMemoryPlugin from 'copy-asset-in-memory-webpack-plugin';

✗ const { CopyAssetInMemoryPlugin } = require('copy-asset-in-memory-webpack-plugin');

TypeScript types are exported as default: `export default class`. Named import fails in CJS because the only export is a default.

type CopyAssetInMemoryPluginOptions

✓ import type { CopyAssetInMemoryPluginOptions } from 'copy-asset-in-memory-webpack-plugin';

✗ import { CopyAssetInMemoryPluginOptions } from 'copy-asset-in-memory-webpack-plugin';

Options type is a named export in TypeScript. For value imports, use default. Type-only import avoids runtime errors.

Shows CommonJS usage in webpack.config.js, copying .js assets to a 'scripts' subfolder in memory.

// webpack.config.js const CopyAssetInMemoryPlugin = require('copy-asset-in-memory-webpack-plugin'); module.exports = { entry: './src/index.js', output: { path: path.resolve(__dirname, 'dist'), filename: 'bundle.js', }, plugins: [ new CopyAssetInMemoryPlugin({ test: /\.js$/, to: (fileName) => `scripts/${fileName}`, }), ], };

Debug

Known issues

breakingv4.0.0 dropped support for webpack 4. Upgrade to webpack 5 to use this version.

fix

Upgrade webpack to ^5.20.0. If stuck on webpack 4, use v3.x.

affects: >=4.0.0

gotchaAssets cannot be copied outside the output directory. Attempting to do so will silently fail or cause undefined behavior.

fix

Ensure the `to` option produces paths relative to the output directory. Do not use absolute paths or '..'.

affects: *

gotchadeleteOriginalAssets: true deletes the asset's source map as well, because source maps are separate assets that share the same base filename.

fix

If you need source maps, either disable deleteOriginalAssets or manually copy the source map before deletion.

affects: *

deprecatedThe `stage` option default is Compilation.PROCESS_ASSETS_STAGE_SUMMARIZE. In future webpack versions, this stage might be removed or behave differently.

fix

Explicitly set stage to Compilation.PROCESS_ASSETS_STAGE_ADDITIONAL for forward compatibility.

affects: >=4.0.0

Errors

Common errors & fixes

Cannot find module 'copy-asset-in-memory-webpack-plugin'

Package not installed or webpack config not resolving node_modules correctly.

fix

Run `npm install -D copy-asset-in-memory-webpack-plugin` and ensure your webpack config is in a directory where node_modules can be resolved.

TypeError: CopyAssetInMemoryPlugin is not a constructor

Incorrect import style; likely using ESM default import in a CJS context, or named import where default was expected.

fix

Use `const CopyAssetInMemoryPlugin = require('copy-asset-in-memory-webpack-plugin');` in CommonJS, or `import CopyAssetInMemoryPlugin from 'copy-asset-in-memory-webpack-plugin';` in ESM (with appropriate configuration).

Error: Hook is not defined for compilation stage

Invalid `stage` value; webpack removed or renamed the stage constant.

fix

Use `Compilation.PROCESS_ASSETS_STAGE_SUMMARIZE` (default) or another valid stage from webpack's Compilation object.

Webpack 5 requires node >=10.13.0 but copy-asset-in-memory-webpack-plugin requires >=12.13

Incompatible Node.js version installed (too low).

fix

Upgrade Node.js to version >=12.13.

Upgrade

Version history

4.0.1latest on npm

Audit

Dependencies

webpackrequiredpeer dependency: requires webpack 5.20+

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/sibiraj-s/copy-asset-in-memory-webpack-plugin ↗

packagehttps://www.npmjs.com/package/copy-asset-in-memory-webpack-plugin ↗