CODEWITHSUNDEEP
javascriptnode.jsfs
Mohit Bhardwaj
Mohit Bhardwaj

Reputation: 10093

how to prevent fs.writeFile from overwriting existing files?

I am creating test files from swagger API definition file. I use fs.writeFile for creating test files (which are mostly stubs, so I need to add details to these files manually). Now the problem is that whenever I generate the test files again, it overwrites all the existing files as well.

So, my question is, is there some option for fs.writeFile that we can set to specify that if a file is already existing, do not overwrite it?

Most obvious way seems to be to first check if a file exists and only generate it if it doesn't exist already. But, if there is some option in fs.writeFile itself, that would be more convenient and compact.

Upvotes: 2

Views: 889

Answers (1)

santosh
santosh

Reputation: 575

fs.writeFile don't have any options as such to check if file already existing.

I would recommend to use fs-extra. Below is one of the solution.

async function writeFile(f) {
    try {
        if ((await fs.pathExists(f)) === false) {
            await fs.outputFile(f, 'hello!');
        }
    } catch (err) {
        console.error(err);
    }
}

writeFile('/tmp/this/path/does/not/exist/file.txt');

Upvotes: 1

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