File: //home/arjun/projects/buyercall/node_modules/copy-webpack-plugin/README.md
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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`:
```console
npm install copy-webpack-plugin --save-dev
```
or
```console
yarn add -D copy-webpack-plugin
```
or
```console
pnpm add -D copy-webpack-plugin
```
Then add the plugin to your `webpack` config. For example:
**webpack.config.js**
```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`](https://github.com/webpack/webpack-dev-middleware#writetodisk) option or the [`write-file-webpack-plugin`](https://github.com/gajus/write-file-webpack-plugin).
> ℹ️ You can get the original source filename from [Asset Objects](https://webpack.js.org/api/stats/#asset-objects).
## Options
- **[`patterns`](#patterns)**
- **[`options`](#options-1)**
The plugin's signature:
**webpack.config.js**
```js
const CopyPlugin = require("copy-webpack-plugin");
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{ from: "source", to: "dest" },
"path/to/source", // absolute or relative, files/directories/globs - see below for examples
],
options: {
concurrency: 100,
},
}),
],
};
```
### `Patterns`
- [`from`](#from)
- [`to`](#to)
- [`context`](#context)
- [`globOptions`](#globoptions)
- [`filter`](#filter)
- [`toType`](#totype)
- [`force`](#force)
- [`priority`](#priority)
- [`transform`](#transform)
- [`transformAll`](#transformAll)
- [`noErrorOnMissing`](#noerroronmissing)
- [`info`](#info)
#### `from`
Type:
```ts
type from = string;
```
Default: `undefined`
Glob or path from where we copy files.
Globs accept [fast-glob pattern-syntax](https://github.com/mrmlnc/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**
```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 (`\\`)
```js
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](https://github.com/mrmlnc/fast-glob#how-to-write-patterns-on-windows).
```js
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`](#examples)
#### `to`
Type:
```ts
type to =
| string
| ((pathData: { context: string; absoluteFilename?: string }) => string);
```
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**
```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**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/*.png",
to({ context, absoluteFilename }) {
return "dest/newPath/[name][ext]";
},
},
],
}),
],
};
```
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/*.png",
to({ context, absoluteFilename }) {
return Promise.resolve("dest/newPath/[name][ext]");
},
},
],
}),
],
};
```
#### `context`
Type:
```ts
type context = 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**
```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`
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`](#examples)
#### `globOptions`
Type:
```ts
type globOptions = import("globby").Options;
```
Default: `undefined`
Allows to configure the glob pattern matching library used by the plugin. [See the list of supported options][glob-options]
To exclude files from the selection, you should use [globOptions.ignore option](https://github.com/mrmlnc/fast-glob#ignore)
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "public/**/*",
globOptions: {
dot: true,
gitignore: true,
ignore: ["**/file.*", "**/ignored-directory/**"],
},
},
],
}),
],
};
```
#### `filter`
Type:
```ts
type filter = (filepath: string) => boolean;
```
Default: `undefined`
> ℹ️ To ignore files by path please use the [`globOptions.ignore`](#globoptions) option.
**webpack.config.js**
```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:
```ts
type toType = "dir" | "file" | "template";
```
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'`](#dir)** | `string` | `undefined` | If `to` has no extension or ends on `'/'` |
| **[`'file'`](#file)** | `string` | `undefined` | If `to` is not a directory and is not a template |
| **[`'template'`](#template)** | `string` | `undefined` | If `to` contains [a template pattern](https://webpack.js.org/configuration/output/#template-strings) |
##### `'dir'`
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "path/to/file.txt",
to: "directory/with/extension.ext",
toType: "dir",
},
],
}),
],
};
```
##### `'file'`
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "path/to/file.txt",
to: "file/without/extension",
toType: "file",
},
],
}),
],
};
```
##### `'template'`
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/",
to: "dest/[name].[contenthash][ext]",
toType: "template",
},
],
}),
],
};
```
#### `force`
Type:
```ts
type force = boolean;
```
Default: `false`
Overwrites files already in `compilation.assets` (usually added by other plugins/loaders).
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/**/*",
to: "dest/",
force: true,
},
],
}),
],
};
```
#### `priority`
Type:
```ts
type priority = 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`](#force) option must be enabled.
**webpack.config.js**
```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:
```ts
type transform =
| {
transformer: (input: string, absoluteFilename: string) => string | Buffer;
cache?: boolean | TransformerCacheObject | undefined;
}
| ((input: string, absoluteFilename: string) => string | Buffer);
```
Default: `undefined`
Allows to modify the file contents.
##### `function`
**webpack.config.js**
```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 | Default | Description |
| :-------------------------------: | :---------: | :--------------------------------------------------------------------------------------------------------------- |
| **[`transformer`](#transformer)** | `undefined` | Allows to modify the file contents. |
| **[`cache`](#cache)** | `false` | Enable `transform` caching. You can use `transform: { cache: { key: 'my-cache-key' } }` to invalidate the cache. |
###### `transformer`
Type:
```ts
type transformer = (input: string, absoluteFilename: string) => string;
```
Default: `undefined`
**webpack.config.js**
```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**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/*.png",
to: "dest/",
transform: {
transformer(content, path) {
return Promise.resolve(optimize(content));
},
},
},
],
}),
],
};
```
###### `cache`
Type:
```ts
type cache =
| boolean
| {
keys: {
[key: string]: any;
};
}
| {
keys: (
defaultCacheKeys: {
[key: string]: any;
},
absoluteFilename: string
) => Promise<{
[key: string]: any;
}>;
}
| undefined;
```
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**
```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**
```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**
```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**
```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:
```ts
type transformAll = (
data: {
data: Buffer;
sourceFilename: string;
absoluteFilename: string;
}[]
) => any;
```
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**
```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:
```ts
type noErrorOnMissing = boolean;
```
Default: `false`
Doesn't generate an error on missing file(s).
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: path.resolve(__dirname, "missing-file.txt"),
noErrorOnMissing: true,
},
],
}),
],
};
```
#### `info`
Type:
```ts
type info =
| Record<string, any>
| ((item: {
absoluteFilename: string;
sourceFilename: string;
filename: string;
toType: ToType;
}) => Record<string, any>);
```
Default: `undefined`
Allows to add assets info.
**webpack.config.js**
```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**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
"relative/path/to/file.ext",
{
from: "**/*",
// Terser skip this file for minimization
info: (file) => ({ minimized: true }),
},
],
}),
],
};
```
### Options
- [`concurrency`](#concurrency)
#### `concurrency`
type:
```ts
type concurrency = number;
```
default: `100`
limits the number of simultaneous requests to fs
**webpack.config.js**
```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**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/directory-nested/**/*",
},
],
}),
],
};
```
Result:
```txt
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**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "**/*",
context: path.resolve(__dirname, "src", "directory-nested"),
},
],
}),
],
};
```
Result:
```txt
deep-nested/deepnested-file.txt,
nested-file.txt
```
##### From is a Dir
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: path.resolve(__dirname, "src", "directory-nested"),
},
],
}),
],
};
```
Result:
```txt
deep-nested/deepnested-file.txt,
nested-file.txt
```
Technically, this is `**/*` with a predefined context equal to the specified directory.
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "**/*",
context: path.resolve(__dirname, "src", "directory-nested"),
},
],
}),
],
};
```
Result:
```txt
deep-nested/deepnested-file.txt,
nested-file.txt
```
##### From is a File
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: path.resolve(
__dirname,
"src",
"directory-nested",
"nested-file.txt"
),
},
],
}),
],
};
```
Result:
```txt
nested-file.txt
```
Technically, this is a filename with a predefined context equal to `path.dirname(pathToFile)`.
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "nested-file.txt",
context: path.resolve(__dirname, "src", "directory-nested"),
},
],
}),
],
};
```
Result:
```txt
nested-file.txt
```
#### Ignoring files
**webpack.config.js**
```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**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: "src/**/*",
to: "[name][ext]",
},
],
}),
],
};
```
Result:
```txt
file-1.txt
file-2.txt
nested-file.txt
```
#### Copy in new directory
**webpack.config.js**
```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/${path.relative(context, absoluteFilename)}`;
},
from: "directory",
},
],
}),
],
};
```
Result:
```txt
"newdirectory/file-1.txt",
"newdirectory/nestedfile.txt",
"newdirectory/nested/deep-nested/deepnested.txt",
"newdirectory/nested/nestedfile.txt",
```
#### Skip running JavaScript files through a minimizer
Useful if you need to simply copy `*.js` files to destination "as is" without evaluating and minimizing them using Terser.
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
"relative/path/to/file.ext",
{
from: "**/*",
// Terser skip this file for minimization
info: { minimized: true },
},
],
}),
],
};
```
##### `yarn workspaces` and `monorepos`
When using `yarn workspaces` or` monorepos`, relative copy paths from node_modules can be broken due to the way packages are hoisting.
To avoid this, should explicitly specify where to copy the files from using `require.resolve`.
**webpack.config.js**
```js
module.exports = {
plugins: [
new CopyPlugin({
patterns: [
{
from: `${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](./.github/CONTRIBUTING.md)
## License
[MIT](./LICENSE)
[npm]: https://img.shields.io/npm/v/copy-webpack-plugin.svg
[npm-url]: https://npmjs.com/package/copy-webpack-plugin
[node]: https://img.shields.io/node/v/copy-webpack-plugin.svg
[node-url]: https://nodejs.org
[deps]: https://david-dm.org/webpack-contrib/copy-webpack-plugin.svg
[deps-url]: https://david-dm.org/webpack-contrib/copy-webpack-plugin
[tests]: https://github.com/webpack-contrib/copy-webpack-plugin/workflows/copy-webpack-plugin/badge.svg
[tests-url]: https://github.com/webpack-contrib/copy-webpack-plugin/actions
[cover]: https://codecov.io/gh/webpack-contrib/copy-webpack-plugin/branch/master/graph/badge.svg
[cover-url]: https://codecov.io/gh/webpack-contrib/copy-webpack-plugin
[chat]: https://img.shields.io/badge/gitter-webpack%2Fwebpack-brightgreen.svg
[chat-url]: https://gitter.im/webpack/webpack
[size]: https://packagephobia.now.sh/badge?p=copy-webpack-plugin
[size-url]: https://packagephobia.now.sh/result?p=copy-webpack-plugin
[glob-options]: https://github.com/sindresorhus/globby#options