Check if a local or remote port is reachable
仓库
sindresorhus 的仓库
Check if JPEG images are progressive
Check if JPEG images are progressive
Check if a Buffer/Uint8Array is a PSD image
Check if a domain is public
Check if servers are reachable
Check if a number is a redirect HTTP status code
Check if a value is a regular expression
Check if a URL is relative
Check whether a request can be retried based on the `error.code`
Check if the process is running as root user, for example, one started with `sudo`
Check if a path is the root path. Example: / or C:\
Check if a filename is safe to use in a path join operation
ES2015 Number.isSafeInteger() ponyfill
Check if a string is a scoped npm package name
Check if something is a Node.js stream
Check whether a RegExp flag is supported. Mostly useful for `y` and `u`.
Check if a string or buffer is SVG
Check if a file path is a text file
Check if a Buffer/Uint8Array is a TIFF image