How to get `__dirname` like Node.js using react native

Question

I want to get current javascript script's dirname name, such as __dirname in node.js. I haven't found the method in the document in react native , and I wonder how to achieve this purpose? Or how can I locate the static file (e.g. .js)? For example like using NSDocumentDirectory to locate a file natively in iOS.

Answer 1

One way to do it would be to create a native module. Here's an example of a really simple one that just gets you a string, which you could customise for your exact requirements. In Xcode, create a new class:

//  DirName.h

#import "RCTBridgeModule.h"

@interface DirName : NSObject<RCTBridgeModule>

@end

//  DirName.m
#import "DirName.h"

@implementation DirName
- (void) get:(RCTResponseSenderBlock)callback {
    RCT_EXPORT();

    // Change this depending on what you want to retrieve:
    NSString* dirName = @"something";

    callback(@[dirName]);
}

@end

Then call it with:

var dirName = require('NativeModules').DirName;

dirName.get(dirName => {
    console.log(dirName);
});

However I'd caveat this. Have a think about what you're doing - do you definitely want to read the filesystem of your iOS device or do you want to use one of the other methods of grabbing documents which is available to you?