joinPath()function

joinPath(first: AbsolutePath, ...rest: PathPart[]): AbsolutePath

joinPath(...parts: PathPart[]): string

Param	Type
`first`	`AbsolutePath`	Absolute path string starting with a / slash. required
`rest`	`PathPart[]`	required
`parts`	`PathPart[]`	required

Return
`AbsolutePath`	Absolute path string starting with a / slash.
`string`

Join one or more path parts into a single path string.

Each part can be a string (e.g. "/foo/bar", "foo") or an array of segments (e.g. ["foo", "bar"]). String parts may themselves contain / separators — they're flattened and normalised.
Runs of // are collapsed and trailing slashes stripped (via cleanPath()); \ Windows slashes are converted too.
If the first argument is an AbsolutePath string (starts with /), the result is also an AbsolutePath; otherwise the return type is string.