Move file in Nodejs if file exists otherwise create file - node.js

Question

I am trying to move a file from a location abc to location xyz if the file already exists in location xyz delete it then save the new one.
Here is my code
const promises = {
deleteFile: path => {
return new Promise((resolve, reject) => {
const fs = require('fs');
fs.stat(path, (err, stat) => {
if (err === null) {
fs.unlink(path, err => {
if (err) { return reject(err) }
resolve();
})
} else if(err.code == 'ENOENT') {
console.log('File does not exist');
resolve();
} else {
reject(err);
}
});
});
},
copyFile: (from, to) => {
return new Promise((resolve, reject)=> {
copyFile(from, to, (err) => {
if (err) { return reject(err); }
console.log(`Finished writing file ${to}`);
resolve();
})
})
}
}
const copyFile = (from, to, overallCb) => {
const fs = require('fs');
const rs = fs.createReadStream(from)
const ws = fs.createWriteStream(to)
let cbCalled = false;
function done (err) {
overallCb(err);
cbCalled = true;
}
rs.on('error', (err) => {
done(err);
})
ws.on('error', (err) => {
done(err);
})
rs.pipe(ws);
}
;
const OUTPUT_PATH = `./js/libs/`
, _NODE_MODULES = './node_modules/'
, filePath = `${_NODE_MODULES}somePathToAFile`
;
promises.deleteFile(`${OUTPUT_PATH}someFile.min.js`)
.then(promises.copyFile(filePath, `${OUTPUT_PATH}someFile.min.js`))
.then(words => {
console.log('**** done doing things ****');
})
.catch(error => { console.log(`ERROR`, error); })
If the file exists it just simply deletes the file and does nothing else.
If the file DOES NOT exist everything works fine.
Any idea on what im doing wrong?

Answer 1

I had some promise errors in my code... For future me here is the working version of the above code
'use strict';
const promises = {
deleteFile: path => {
return new Promise((resolve, reject) => {
const fs = require('fs');
fs.stat(path, (err, stat) => {
if (err === null) {
fs.unlink(path, err => {
if (err) { return reject(err) }
resolve(`Removing document at ${path}`);
})
} else if(err.code === 'ENOENT') {
resolve('File does not exist');
} else {
reject(err);
}
});
});
},
copyFile: (from, to) => {
return new Promise((resolve, reject) => {
copyFile(from, to, (err) => {
if (err) { return reject(err); }
resolve(`Finished writing file ${to}`);
})
})
}
}
const copyFile = (from, to, overallCb) => {
const fs = require('fs');
const rs = fs.createReadStream(from)
const ws = fs.createWriteStream(to)
let cbCalled = false;
function done (err) {
overallCb(err);
cbCalled = true;
}
rs.on('error', done)
ws.on('error', done)
.on('close', done)
rs.pipe(ws);
}
;
const OUTPUT_PATH = './js/libs/'
, _NODE_MODULES = './node_modules/'
, filePath = `${_NODE_MODULES}somePathToAFile`
;
promises.deleteFile(`${OUTPUT_PATH}someFile.min.js`)
.then(msg => {
console.log(msg)
return promises.copyFile(filePath, `${OUTPUT_PATH}someFile.js`)
})
.then(msg => {
console.log(msg)
})
.catch(err => { // Do errory things}