TypeError: compilation.getCache is not a function

[Iffyyy]

i install this plugin with npm in my vue project,and configured in vue.config.js.when i start the project,it told me that 'TypeError: compilation.getCache is not a function' at 'copy-webpack-plugin\dist\index.js:459:33'

[killtheliterate]

@Iffyyy I hit this after a fresh install npm i copy-webpack-plugin — that'll install v7 of the plugin, which requires webpack 5. I'm not using webpack 5, and resolved by npm i copy-webpack-plugin@6.

[sarink]

Something stating "v6 of this plugin works with webpack v4" really needs to be added to the README.

[alexander-akait]

Please do not ignore messages from package manager you need webpack@5 for latest version

[AzrizHaziq]

Hi, i'm using copy-webpack-plugin@6.4.1 and webpack@5.16.0 works charmingly node@15.3.0.
For copy-webpack-plugin@7.0.0 and webpack@5.16.0 still got error compilation.getCache.

[alexander-akait]

@AzrizHaziq it means you still on webpack@4, run npm ls webpack

[AzrizHaziq]

@alexander-akait

├─┬ copy-webpack-plugin@6.4.1
│ └── webpack@5.16.0 deduped
├─┬ size-plugin@2.0.1
│ └── webpack@5.16.0 deduped
├─┬ terser-webpack-plugin@5.1.1
│ └── webpack@5.16.0 deduped
├─┬ webpack-cli@3.3.12
│ └─┬ webpack@4.46.0
│   └─┬ terser-webpack-plugin@1.4.5
│     └── webpack@4.46.0 deduped
├── webpack@5.16.0
└─┬ xo@0.32.1
  └─┬ eslint-import-resolver-webpack@0.12.2
    └── webpack@5.16.0 deduped
    ```

[alexander-akait]

update webpack-cli to the 4 version

[AzrizHaziq]

I think i mess up a little bit. I'm currently using lerna, and strangely it was using webpack@4.*.
Please ignore my previous comment 😄 .

Thanks @alexander-akait.

[omarceloribeiro]

@Iffyyy I hit this after a fresh install npm i copy-webpack-plugin — that'll install v7 of the plugin, which requires webpack 5. I'm not using webpack 5, and resolved by npm i copy-webpack-plugin@6.

that worked for my issue with spfx projetct! thank so much!!