Document outputFile() only supports a file path

`fs.writeFile()` supports a buffer or a file descriptor as 1st argument (`file`), but `fs-extra.outputFile()` does not. Because it sends `file` parameter to `path.dirname()` that requires `String`.
jprichardson · Mar 5, 2017 · 6e0f0cc · 6e0f0cc
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Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/outputFile.md b/docs/outputFile.md
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 # outputFile(file, data, [options], callback)
 
-Almost the same as `writeFile` (i.e. it [overwrites](http://pages.citebite.com/v2o5n8l2f5reb)), except that if the parent directory does not exist, it's created. `options` are what you'd pass to [`fs.writeFile()`](https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback).
+Almost the same as `writeFile` (i.e. it [overwrites](http://pages.citebite.com/v2o5n8l2f5reb)), except that if the parent directory does not exist, it's created. `file` must be a file path (a buffer or a file descriptor is not allowed). `options` are what you'd pass to [`fs.writeFile()`](https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback).
 
 **Sync:** `outputFileSync()`