isAbsolute
function isAbsolute(path: string): path is string;
A path that starts at a root: a leading /, or a scheme such as https:// or mailto:. Everything else, the empty string included, is relative.
isX and nonX answer a question and never interrupt control flow; requireX and requireNonX hand the value back or throw. The scheme is explained in Validation conventions.
Parameters
Parameter | Type | Description |
|---|---|---|
|
| The path to check. |
Returns
boolean — true when the value is an absolute path; otherwise false.
In TypeScript the guard narrows path to string inside the branch.
Examples
What passes and what does not
isAbsolute("/var/log"); // => true
isAbsolute("https://example.com/a"); // => true
isAbsolute("mailto:a@example.com"); // => true
isAbsolute("docs/readme.md"); // => false
isAbsolute("./a"); // => false
isAbsolute(""); // => false
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.