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    copy-webpack-plugin
    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/copy-webpack-plugin package

    9.0.0 • Public • Published

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    copy-webpack-plugin

    Copies individual files or entire directories, which already exist, to the build directory.

    Getting Started

    To begin, you'll need to install copy-webpack-plugin:

    npm install copy-webpack-plugin --save-dev

    Then add the plugin to your webpack config. For example:

    webpack.config.js

    const CopyPlugin = require("copy-webpack-plugin");
    
    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            { from: "source", to: "dest" },
            { from: "other", to: "public" },
          ],
        }),
      ],
    };

    ℹ️ copy-webpack-plugin is not designed to copy files generated from the build process; rather, it is to copy files that already exist in the source tree, as part of the build process.

    ℹ️ If you want webpack-dev-server to write files to the output directory during development, you can force it with the writeToDisk option or the write-file-webpack-plugin.

    ℹ️ You can get the original source filename from Asset Objects.

    Options

    The plugin's signature:

    webpack.config.js

    const CopyPlugin = require("copy-webpack-plugin");
    
    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            { from: "source", to: "dest" },
            { from: "other", to: "public" },
          ],
          options: {
            concurrency: 100,
          },
        }),
      ],
    };

    Patterns

    Name Type Default Description
    from {String} undefined Glob or path from where we copy files.
    to {String|Function} compiler.options.output Output path.
    context {String} options.context || compiler.options.context A path that determines how to interpret the from path.
    globOptions {Object} undefined Options passed to the glob pattern matching library including ignore option.
    filter {Function} undefined Allows to filter copied assets.
    toType {String} undefined Determinate what is to option - directory, file or template.
    force {Boolean} false Overwrites files already in compilation.assets (usually added by other plugins/loaders).
    priority {Number} 0 Allows you to specify the copy priority.
    transform {Object} undefined Allows to modify the file contents. Enable transform caching. You can use { transform: {cache: { key: 'my-cache-key' }} } to invalidate the cache.
    transformAll {Function} undefined Allows you to modify the contents of multiple files and save the result to one file.
    noErrorOnMissing {Boolean} false Doesn't generate an error on missing file(s).
    info {Object|Function} undefined Allows to add assets info.

    from

    Type: String Default: undefined

    Glob or path from where we copy files. Globs accept fast-glob pattern-syntax. Glob can only be a string.

    ⚠️ Don't use directly \\ in from option if it is a glob (i.e path\to\file.ext) option because on UNIX the backslash is a valid character inside a path component, i.e., it's not a separator. On Windows, the forward slash and the backward slash are both separators. Instead please use /.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            "relative/path/to/file.ext",
            "relative/path/to/dir",
            path.resolve(__dirname, "src", "file.ext"),
            path.resolve(__dirname, "src", "dir"),
            "**/*",
            {
              from: "**/*",
            },
            // If absolute path is a `glob` we replace backslashes with forward slashes, because only forward slashes can be used in the `glob`
            path.posix.join(
              path.resolve(__dirname, "src").replace(/\\/g, "/"),
              "*.txt"
            ),
          ],
        }),
      ],
    };
    For windows

    If you define from as absolute file path or absolute folder path on Windows, you can use windows path segment (\\)

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: path.resolve(__dirname, "file.txt"),
            },
          ],
        }),
      ],
    };

    But you should always use forward-slashes in glob expressions See fast-glob manual.

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              // If absolute path is a `glob` we replace backslashes with forward slashes, because only forward slashes can be used in the `glob`
              from: path.posix.join(
                path.resolve(__dirname, "fixtures").replace(/\\/g, "/"),
                "*.txt"
              ),
            },
          ],
        }),
      ],
    };

    The context behaves differently depending on what the from is (glob, file or dir). More examples

    to

    Type: String|Function Default: compiler.options.output

    String

    Output path.

    ⚠️ Don't use directly \\ in to (i.e path\to\dest) option because on UNIX the backslash is a valid character inside a path component, i.e., it's not a separator. On Windows, the forward slash and the backward slash are both separators. Instead please use / or path methods.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "**/*",
              to: "relative/path/to/dest/",
            },
            {
              from: "**/*",
              to: "/absolute/path/to/dest/",
            },
            {
              from: "**/*",
              to: "[path][name].[contenthash][ext]",
            },
          ],
        }),
      ],
    };
    Function

    Allows to modify the writing path.

    ⚠️ Don't return directly \\ in to (i.e path\to\newFile) option because on UNIX the backslash is a valid character inside a path component, i.e., it's not a separator. On Windows, the forward slash and the backward slash are both separators. Instead please use / or path methods.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to({ context, absoluteFilename }) {
                return "dest/newPath/[name][ext]";
              },
            },
          ],
        }),
      ],
    };

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to({ context, absoluteFilename }) {
                return Promise.resolve("dest/newPath/[name][ext]");
              },
            },
          ],
        }),
      ],
    };

    context

    Type: String Default: options.context|compiler.options.context

    A path that determines how to interpret the from path.

    ⚠️ Don't use directly \\ in context (i.e path\to\context) option because on UNIX the backslash is a valid character inside a path component, i.e., it's not a separator. On Windows, the forward slash and the backward slash are both separators. Instead please use / or path methods.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.txt",
              to: "dest/",
              context: "app/",
            },
          ],
        }),
      ],
    };

    The context option can be an absolute or relative path. If context is a relative, then it is converted to absolute based to compiler.options.context

    Also, context indicates how to interpret the search results. Further, he is considered in this role.

    To determine the structure from which the found resources will be copied to the destination folder, the context option is used.

    If from is a file, then context is equal to the directory in which this file is located. Accordingly, the result will be only the file name.

    If from is a directory, then context is the same as from and is equal to the directory itself. In this case, the result will be a hierarchical structure of the found folders and files relative to the specified directory.

    If from is a glob, then regardless of the context option, the result will be the structure specified in the from option

    More examples

    globOptions

    Type: Object Default: undefined

    Allows to configute the glob pattern matching library used by the plugin. See the list of supported options To exclude files from the selection, you should use globOptions.ignore option

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "public/**/*",
              globOptions: {
                dot: true,
                gitignore: true,
                ignore: ["**/file.*", "**/ignored-directory/**"],
              },
            },
          ],
        }),
      ],
    };

    filter

    Type: Function Default: undefined

    ℹ️ To ignore files by path please use the globOptions.ignore option.

    webpack.config.js

    const fs = require("fs").promise;
    
    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "public/**/*",
              filter: async (resourcePath) => {
                const data = await fs.promises.readFile(resourcePath);
                const content = data.toString();
    
                if (content === "my-custom-content") {
                  return false;
                }
    
                return true;
              },
            },
          ],
        }),
      ],
    };

    toType

    Type: String Default: undefined

    Determinate what is to option - directory, file or template. Sometimes it is hard to say what is to, example path/to/dir-with.ext. If you want to copy files in directory you need use dir option. We try to automatically determine the type so you most likely do not need this option.

    Name Type Default Description
    'dir' {String} undefined If to has no extension or ends on '/'
    'file' {String} undefined If to is not a directory and is not a template
    'template' {String} undefined If to contains a template pattern
    'dir'

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "path/to/file.txt",
              to: "directory/with/extension.ext",
              toType: "dir",
            },
          ],
        }),
      ],
    };
    'file'

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "path/to/file.txt",
              to: "file/without/extension",
              toType: "file",
            },
          ],
        }),
      ],
    };
    'template'

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/",
              to: "dest/[name].[contenthash][ext]",
              toType: "template",
            },
          ],
        }),
      ],
    };

    force

    Type: Boolean Default: false

    Overwrites files already in compilation.assets (usually added by other plugins/loaders).

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/**/*",
              to: "dest/",
              force: true,
            },
          ],
        }),
      ],
    };

    priority

    Type: Number Default: 0

    Allows to specify the priority of copying files with the same destination name. Files for patterns with higher priority will be copied later. To overwrite files, the force option must be enabled.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            // Copied second and will overwrite "dir_2/file.txt"
            {
              from: "dir_1/file.txt",
              to: "newfile.txt",
              force: true,
              priority: 10,
            },
            // Copied first
            {
              from: "dir_2/file.txt",
              to: "newfile.txt",
              priority: 5,
            },
          ],
        }),
      ],
    };

    transform

    Type: Function|Object Default: undefined

    Allows to modify the file contents.

    Function

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              // The `content` argument is a [`Buffer`](https://nodejs.org/api/buffer.html) object, it could be converted to a `String` to be processed using `content.toString()`
              // The `absoluteFrom` argument is a `String`, it is absolute path from where the file is being copied
              transform(content, absoluteFrom) {
                return optimize(content);
              },
            },
          ],
        }),
      ],
    };
    Object
    Name Type Default Description
    transformer {Function} undefined Allows to modify the file contents.
    cache {Boolean|Object} false Enable transform caching. You can use transform: { cache: { key: 'my-cache-key' } } to invalidate the cache.
    transformer

    Type: Function Default: undefined

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              // The `content` argument is a [`Buffer`](https://nodejs.org/api/buffer.html) object, it could be converted to a `String` to be processed using `content.toString()`
              // The `absoluteFrom` argument is a `String`, it is absolute path from where the file is being copied
              transform: {
                transformer(content, absoluteFrom) {
                  return optimize(content);
                },
              },
            },
          ],
        }),
      ],
    };

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              transform: {
                transformer(content, path) {
                  return Promise.resolve(optimize(content));
                },
              },
            },
          ],
        }),
      ],
    };
    cache

    Type: Boolean|Object Default: false

    webpack.config.js

    Enable/disable and configure caching. Default path to cache directory: node_modules/.cache/copy-webpack-plugin.

    Boolean

    Enables/Disable transform caching.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              transform: {
                transformer(content, path) {
                  return optimize(content);
                },
                cache: true,
              },
            },
          ],
        }),
      ],
    };
    Object

    Enables transform caching and setup cache directory and invalidation keys.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              transform: {
                transformer(content, path) {
                  return optimize(content);
                },
                cache: {
                  directory: path.resolve(__dirname, "cache-directory"),
                  keys: {
                    // May be useful for invalidating cache based on external values
                    // For example, you can invalid cache based on `process.version` - { node: process.version }
                    key: "value",
                  },
                },
              },
            },
          ],
        }),
      ],
    };

    You can setup invalidation keys using a function.

    Simple function:

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              transform: {
                transformer(content, path) {
                  return optimize(content);
                },
                cache: {
                  directory: path.resolve(__dirname, "cache-directory"),
                  keys: (defaultCacheKeys, absoluteFrom) => {
                    const keys = getCustomCacheInvalidationKeysSync();
    
                    return {
                      ...defaultCacheKeys,
                      keys,
                    };
                  },
                },
              },
            },
          ],
        }),
      ],
    };

    Async function:

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/*.png",
              to: "dest/",
              transform: {
                transformer(content, path) {
                  return optimize(content);
                },
                cache: {
                  directory: path.resolve(__dirname, "cache-directory"),
                  keys: async (defaultCacheKeys, absoluteFrom) => {
                    const keys = await getCustomCacheInvalidationKeysAsync();
    
                    return {
                      ...defaultCacheKeys,
                      keys,
                    };
                  },
                },
              },
            },
          ],
        }),
      ],
    };

    transformAll

    Type: Function Default: undefined

    Allows you to modify the contents of multiple files and save the result to one file.

    ℹ️ The to option must be specified and point to a file. It is allowed to use only [contenthash] and [fullhash] template strings.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/**/*.txt",
              to: "dest/file.txt",
              // The `assets` argument is an assets array for the pattern.from ("src/**/*.txt")
              transformAll(assets) {
                const result = assets.reduce((accumulator, asset) => {
                  // The asset content can be obtained from `asset.source` using `source` method.
                  // The asset content is a [`Buffer`](https://nodejs.org/api/buffer.html) object, it could be converted to a `String` to be processed using `content.toString()`
                  const content = asset.data;
    
                  accumulator = `${accumulator}${content}\n`;
                  return accumulator;
                }, "");
    
                return result;
              },
            },
          ],
        }),
      ],
    };

    noErrorOnMissing

    Type: Boolean Default: false

    Doesn't generate an error on missing file(s);

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: path.resolve(__dirname, "missing-file.txt"),
              noErrorOnMissing: true,
            },
          ],
        }),
      ],
    };

    info

    Type: Object|Function<Object> Default: undefined

    Allows to add assets info.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            "relative/path/to/file.ext",
            {
              from: "**/*",
              // Terser skip this file for minimization
              info: { minimized: true },
            },
          ],
        }),
      ],
    };

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            "relative/path/to/file.ext",
            {
              from: "**/*",
              // Terser skip this file for minimization
              info: (file) => ({ minimized: true }),
            },
          ],
        }),
      ],
    };

    Options

    Name Type Default Description
    concurrency {Number} 100 Limits the number of simultaneous requests to fs

    concurrency

    limits the number of simultaneous requests to fs

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [...patterns],
          options: { concurrency: 50 },
        }),
      ],
    };

    Examples

    Different variants from (glob, file or dir).

    Take for example the following file structure:

    src/directory-nested/deep-nested/deepnested-file.txt
    src/directory-nested/nested-file.txt
    
    From is a Glob

    Everything that you specify in from will be included in the result:

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/directory-nested/**/*",
            },
          ],
        }),
      ],
    };

    Result:

    src/directory-nested/deep-nested/deepnested-file.txt,
    src/directory-nested/nested-file.txt
    

    If you want only content src/directory-nested/, you should only indicate glob in from. The path to the folder in which the search should take place, should be moved to context.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "**/*",
              context: path.resolve(__dirname, "src", "directory-nested"),
            },
          ],
        }),
      ],
    };

    Result:

    deep-nested/deepnested-file.txt,
    nested-file.txt
    
    From is a Dir

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: path.resolve(__dirname, "src", "directory-nested"),
            },
          ],
        }),
      ],
    };

    Result:

    deep-nested/deepnested-file.txt,
    nested-file.txt
    

    Technically, this is **/* with a predefined context equal to the specified directory.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "**/*",
              context: path.resolve(__dirname, "src", "directory-nested"),
            },
          ],
        }),
      ],
    };

    Result:

    deep-nested/deepnested-file.txt,
    nested-file.txt
    
    From is a File
    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: path.resolve(
                __dirname,
                "src",
                "directory-nested",
                "nested-file.txt"
              ),
            },
          ],
        }),
      ],
    };

    Result:

    nested-file.txt
    

    Technically, this is a filename with a predefined context equal to path.dirname(pathToFile).

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "nested-file.txt",
              context: path.resolve(__dirname, "src", "directory-nested"),
            },
          ],
        }),
      ],
    };

    Result:

    nested-file.txt
    

    Ignoring files

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: path.posix.join(
                path.resolve(__dirname, "src").replace(/\\/g, "/"),
                "**/*"
              ),
              globOptions: {
                ignore: [
                  // Ignore all `txt` files
                  "**/*.txt",
                  // Ignore all files in all subdirectories
                  "**/subdir/**",
                ],
              },
            },
          ],
        }),
      ],
    };

    Flatten copy

    Removes all directory references and only copies file names.

    ⚠️ If files have the same name, the result is non-deterministic.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: "src/**/*",
              to: "[name][ext]",
            },
          ],
        }),
      ],
    };

    Result:

    file-1.txt
    file-2.txt
    nested-file.txt
    

    Copy in new directory

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              // When copying files starting with a dot, must specify the toType option
              // toType: "file",
              to({ context, absoluteFilename }) {
                return `newdirectory/${path.relative(context, absoluteFilename)}`;
              },
              from: "directory",
            },
          ],
        }),
      ],
    };

    Result:

    "newdirectory/file-1.txt",
    "newdirectory/nestedfile.txt",
    "newdirectory/nested/deep-nested/deepnested.txt",
    "newdirectory/nested/nestedfile.txt",
    

    Skip running JavaScript files through a minimizer

    Useful if you need to simply copy *.js files to destination "as is" without evaluating and minimizing them using Terser.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            "relative/path/to/file.ext",
            {
              from: "**/*",
              // Terser skip this file for minimization
              info: { minimized: true },
            },
          ],
        }),
      ],
    };
    yarn workspaces and monorepos

    When using yarn workspaces or monorepos, relative copy paths from node_modules can be broken due to the way packages are hoisting. To avoid this, should explicitly specify where to copy the files from using require.resolve.

    webpack.config.js

    module.exports = {
      plugins: [
        new CopyPlugin({
          patterns: [
            {
              from: `${path.dirname(
                require.resolve(`${moduleName}/package.json`)
              )}/target`,
              to: "target",
            },
          ],
        }),
      ],
    };

    Contributing

    Please take a moment to read our contributing guidelines if you haven't yet done so.

    CONTRIBUTING

    License

    MIT

    Install

    npm i copy-webpack-plugin

    DownloadsWeekly Downloads

    4,996,536

    Version

    9.0.0

    License

    MIT

    Unpacked Size

    60 kB

    Total Files

    7

    Last publish

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