async npmGetGlobalPrefix() { // eslint-disable-line class-methods-use-this
        // Does not need setup to have run

        const opts = this.npmCmdOpts
        opts.out = 'bare' // returns just the output string

        const args = [
            'config',
            'get',
            'prefix',
        ]

        /** @type {string} */
        let out
        try {
            out = await runOsCmd('npm', args, opts)
        } catch (e) {
            const myerr = new Error(`runOsCmd/npmGetGlobalPrefix failed. ${e.message}`)
            myerr.all = ''
            myerr.code = 3
            myerr.command = `npm ${args.join(' ')}`
            throw myerr
        }

        return out
    }
Gets the global install folder for npm & saves to a class variable
@returns {string} The npm global install folder name