TypeError: ManifestPlugin is not a constructor

Manifest Plugin Version: 3.0.0
Webpack Version: 5.9.0
Operating System (or Browser): MacOS Catalina
Node Version: v12.13.0
Link to reproduction (⚠️ read below): https://repl.it/@mizziness/manifest-plugin-repro#package.json

(Note: the above repro is an exact copypasta of my local project, however, I get a the same thing with a minimal build, so I am able to rule out my other plugins and config. A link to that super minimal repo is: https://repl.it/@mizziness/manifest-plugin-repro-1#package.json )

Expected Behavior

I expect to be able to run basic webpack commands without error.

Actual Behavior

Webpack commands, such as webpack --mode development result in the error: [webpack-cli] TypeError: ManifestPlugin is not a constructor

Additional Information

Local stack trace using yarn:

yarn run v1.22.5
$ webpack --mode development
[webpack-cli] TypeError: ManifestPlugin is not a constructor
    at Object.<anonymous> (/Applications/MAMP/help.applause.com/webpack.config.js:79:5)
    at Module._compile (/Applications/MAMP/help.applause.com/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Module.require (internal/modules/cjs/loader.js:849:19)
    at require (/Applications/MAMP/help.applause.com/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
    at requireConfig (/Applications/MAMP/help.applause.com/node_modules/webpack-cli/lib/groups/resolveConfig.js:73:18)
    at Array.map (<anonymous>)
    at resolveConfigFiles (/Applications/MAMP/help.applause.com/node_modules/webpack-cli/lib/groups/resolveConfig.js:124:40)
error Command failed with exit code 2.

Workaround:

Currently, using webpack-manifest-plugin@^2.0.3 will allow me to build correctly.

Issue Analytics

State:
Created 3 years ago
Comments:9 (6 by maintainers)

Top GitHub Comments

8reactions

erik-perricommented, Dec 4, 2020

There is no longer a default export, try changing the require to

const { WebpackManifestPlugin } = require('webpack-manifest-plugin');

(and switch ManifestPlugin with WebpackManifestPlugin in the webpack config)

1reaction

shellscapecommented, Dec 23, 2020

It’s in the README. Always read the docs when upgrading majors.

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