copy(src, dest, [options, callback])

Copy a file or directory. The directory can have contents. Like `cp -r`.

- `src` `<String>`
- `dest` `<String>`
- `options` `<Object>`
  - `overwrite` `<boolean>`: overwrite existing file or directory, default is `true`. Note that the copy operation will silently fail if you set this to `false` and the destination exists. Use the `errorOnExist` option to change this behavior.
  - `errorOnExist` `<boolean>`: when `overwrite` is `false` and the destination exists, throw an error. Default is `false`.
  - `dereference` `<boolean>`: dereference symlinks, default is `false`.
  - `preserveTimestamps` `<boolean>`: will set last modification and access times to the ones of the original source files, default is `false`.
  - `filter` `<Function>`: Function to filter copied files. Return `true` to include, `false` to exclude. This can also be a RegExp, however this is deprecated (See issue #239 for background).
- `callback` `<Function>`

# Example:

const fs = require('fs-extra')
fs.copy('/tmp/myfile', '/tmp/mynewfile', err => {
if (err) return console.error(err)
console.log('success!')
}) // copies file
fs.copy('/tmp/mydir', '/tmp/mynewdir', err => {
if (err) return console.error(err)
console.log('success!')
}) // copies directory, even if it has subdirectories or files
// Promise usage:
fs.copy('/tmp/myfile', '/tmp/mynewfile')
.then(() => {
console.log('success!')
})
.catch(err => {
console.error(err)
})

Using filter function

const fs = require('fs-extra')
const filterFunc = (src, dest) => {
// your logic here
// it will be copied if return true
}
fs.copy('/tmp/mydir', '/tmp/mynewdir', { filter: filterFunc }, err => {
if (err) return console.error(err)
console.log('success!')
})