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# copy-concurrently Copy files, directories and symlinks ``` const copy = require('copy-concurrently') copy('/path/to/thing', '/new/path/thing').then(() => { // this is now copied }).catch(err => { // oh noooo }) ``` Copies files, directories and symlinks. Ownership is maintained when running as root, permissions are always maintained. On Windows, if symlinks are unavailable then junctions will be used. ## PUBLIC INTERFACE ### copy(from, to, [options]) → Promise Recursively copies `from` to `to` and resolves its promise when finished. If `to` already exists then the promise will be rejected with an `EEXIST` error. Options are: * maxConcurrency – (Default: `1`) The maximum number of concurrent copies to do at once. * recurseWith - (Default: `copy.item`) The function to call on each file after recursing into a directory. * isWindows - (Default: `process.platform === 'win32'`) If true enables Windows symlink semantics. This requires an extra `stat` to determine if the destination of a symlink is a file or directory. If symlinking a directory fails then we'll try making a junction instead. Options can also include dependency injection: * Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's. * fs - (Default: `require('fs')`) The filesystem module to use. Can be used to use `graceful-fs` or to inject a mock. * writeStreamAtomic - (Default: `require('fs-write-stream-atomic')`) The implementation of `writeStreamAtomic` to use. Used to inject a mock. * getuid - (Default: `process.getuid`) A function that returns the current UID. Used to inject a mock. ## EXTENSION INTERFACE Ordinarily you'd only call `copy` above. But it's possible to use it's component functions directly. This is useful if, say, you're writing [move-concurently](https://npmjs.com/package/move-concurrently). ### copy.file(from, to, options) → Promise Copies a ordinary file `from` to destination `to`. Uses `fs-write-stream-atomic` to ensure that the file is entirely copied or not at all. Options are: * uid, gid - (Optional) If `getuid()` is `0` then this and gid will be used to set the user and group of `to`. If uid is present then gid must be too. * mode - (Optional) If set then `to` will have its perms set to `mode`. * fs - (Default: `require('fs')`) The filesystem module to use. Can be used to use `graceful-fs` or to inject a mock. * Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's. * writeStreamAtomic - (Default `require('fs-write-stream-atomic')`) The implementation of `writeStreamAtomic` to use. Used to inject a mock. ### copy.symlink(from, to, options) → Promise Copies a symlink `from` to destination `to`. If on Windows then if symlinking fails, a junction will be used instead. Options are: * top - The top level the copy is being run from. This is used to determine if the symlink destination is within the set of files we're copying or outside it. * fs - (Default: `require('fs')`) The filesystem module to use. Can be used to use `graceful-fs` or to inject a mock. * Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's. * isWindows - (Default: `process.platform === 'win32'`) If true enables Windows symlink semantics. This requires an extra `stat` to determine if the destination of a symlink is a file or directory. If symlinking a directory fails then we'll try making a junction instead. ### copy.recurse(from, to, options) → Promise Reads all of the files in directory `from` and adds them to the `queue` using `recurseWith` (by default `copy.item`). Options are: * queue - A [`run-queue`](https://npmjs.com/package/run-queue) object to add files found inside `from` to. * recurseWith - (Default: `copy.item`) The function to call on each file after recursing into a directory. * uid, gid - (Optional) If `getuid()` is `0` then this and gid will be used to set the user and group of `to`. If uid is present then gid must be too. * mode - (Optional) If set then `to` will have its perms set to `mode`. * fs - (Default: `require('fs')`) The filesystem module to use. Can be used to use `graceful-fs` or to inject a mock. * getuid - (Default: `process.getuid`) A function that returns the current UID. Used to inject a mock. ### copy.item(from, to, options) → Promise Copies some kind of `from` to destination `to`. This looks at the filetype and calls `copy.file`, `copy.symlink` or `copy.recurse` as appropriate. Symlink copies are queued with a priority such that they happen after all file and directory copies as you can't create a junction on windows to a file that doesn't exist yet. Options are: * top - The top level the copy is being run from. This is used to determine if the symlink destination is within the set of files we're copying or outside it. * queue - The [`run-queue`](https://npmjs.com/package/run-queue) object to pass to `copy.recurse` if `from` is a directory. * recurseWith - (Default: `copy.item`) The function to call on each file after recursing into a directory. * uid, gid - (Optional) If `getuid()` is `0` then this and gid will be used to set the user and group of `to`. If uid is present then gid must be too. * mode - (Optional) If set then `to` will have its perms set to `mode`. * fs - (Default: `require('fs')`) The filesystem module to use. Can be used to use `graceful-fs` or to inject a mock. * getuid - (Default: `process.getuid`) A function that returns the current UID. Used to inject a mock. * isWindows - (Default: `process.platform === 'win32'`) If true enables Windows symlink semantics. This requires an extra `stat` to determine if the destination of a symlink is a file or directory. If symlinking a directory fails then we'll try making a junction instead. * Promise - (Default: `global.Promise`) The promise implementation to use, defaults to Node's. * writeStreamAtomic - (Default `require('fs-write-stream-atomic')`) The implementation of `writeStreamAtomic` to use. Used to inject a mock.
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