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These types are not exported by webpack, but they are available to TypeScript consumers.

Attributes
dirname:<object>
lstat:
{LStatFs}
lstatSync:
{LStatSync}
purge:<object>
readdir:
{ReaddirFs}
readdirSync:
{ReaddirSync}
readFile:
{ReadFileFs}
readFileSync:
{ReadFileSync}
readJson:<object>
readJsonSync:<object>
readlink:
{ReadlinkFs}
readlinkSync:
{ReadlinkSync}
realpath:
{RealPathFs}
realpathSync:
{RealPathSync}
relative:<object>
stat:
{StatFs}
statSync:
{StatSync}

Attributes
createReadStream:<object>
dirname:<object>
lstat:
{LStatFs}
mkdir:
{Mkdir}
readdir:
{ReaddirFs}
readFile:
{ReadFileFs}
relative:<object>
rmdir:<object>
stat:
{StatFs}
unlink:<object>
writeFile:
{WriteFile}