No ability to change cache directory path

[yankos]

Expected behaviour

const server = require("highcharts-export-server");
server.setOptions({
    other: {
        cacheDir: "/tmp/highcharts"
    }
});

Highcharts will use other.cacheDir from configuration instead hardcoded const cachePath = join(__dirname, '.cache');.

Actual behaviour

Highcharts use hardcoded const cachePath = join(__dirname, '.cache');.
Which caused an error when cachePath is not writable.

We package dependencies into a system package (deb, rpm, etc.) to speed-up deployment. So user can not write into the "node_modules" directory and it is causes a crash of Highcharts export server.

[jszuminski]

This has been fixed on the master branch with this pull request: #488 so this should no longer be an issue from v4.0.0.

[jszuminski]

Completed via #488. Will be a part of v4.0.0.