https://github.com/vasilevvitalii/vv-filestream

For NodeJS, custom WriteStream, based on standard fs.WriteStream
https://github.com/vasilevvitalii/vv-filestream

nodejs writestream

Last synced: about 2 months ago
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For NodeJS, custom WriteStream, based on standard fs.WriteStream

• Host: GitHub
• URL: https://github.com/vasilevvitalii/vv-filestream
• Owner: VasilevVitalii
• License: mit
• Created: 2021-09-24T07:31:22.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2022-01-14T07:47:39.000Z (almost 3 years ago)
• Last Synced: 2024-11-04T01:32:39.773Z (2 months ago)
• Topics: nodejs, writestream
• Language: TypeScript
• Homepage:
• Size: 203 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# For NodeJS, custom WriteStream, based on standard fs.WriteStream.

## Features

1. Parallel writing multiple files (with once callback after the end of recording all files)

2. Ability to write JSON through the stream (see example)

## License

**MIT**

## Install

```

npm i vv-filestream

```

## Example

Writing two files. Each file is written in two chunks. First file has bad name, second file has good name.

### code

```javascript

const path = require('path')

const fs = require('fs')

const fileNameBad = 'a:/bad.json'

const fileNameGood = path.join(__dirname, 'good.json')

const data1 = [{aaaa: 1},{aaaa: 2},{aaaa: 3}]

const data2 = [{aaaa: 1, bbbb: 1},{aaaa: 2, bbbb: 2},{aaaa: 3, bbbb: 3},{aaaa: 4, bbbb: 4},{aaaa: 5, bbbb: 5}]

const vvfs = require('vv-filestream').Create({prefix: '[\n', suffix: '{}\n]'})

vvfs.onClose(result => {

    result.forEach(f => {

        console.log(`file   ${f.fullFileName}`)

        if (f.error) {

            console.log(`ERROR   ${f.error.message}`)

        } else {

            console.log('DATA')

            console.log(JSON.parse(fs.readFileSync(f.fullFileName, 'utf8')))

        }

    })

})

vvfs.write({fullFileName: fileNameBad, data: data1.slice(0, 2)})

vvfs.write({fullFileName: fileNameGood, data: data2.slice(0, 2)})

vvfs.write({fullFileName: fileNameBad, data: data1.slice(2, 5)})

vvfs.write({fullFileName: fileNameGood, data: data2.slice(2, 5)})

vvfs.close()

```

### note for result

1. result in vvfs.onClose - array:

```

[

    {fullFileName: 'a:/bad.json', error: Error: ENOENT: no such file or directory, open 'a:\\bad.json'}

    {fullFileName: ' ...  good.json', error: undefined}

]

```

2. file **good.json** has content (last empty object used to escape the comma after the previous line):

```

[

{"aaaa":1,"bbbb":2},

{"aaaa":2,"bbbb":2},

{"aaaa":3,"bbbb":3},

{"aaaa":4,"bbbb":4},

{"aaaa":5,"bbbb":5},

{}

]

```