Recently, while delving into the vue-next source code, I stumbled upon a particular line that left me puzzled. Due to my limited experience with TypeScript, I found myself struggling to grasp its purpose.
Could someone clarify if this snippet constitutes a function? If so, what exactly is its intended functionality?
const isComment = (node: Node): node is Comment =>
node.nodeType === DOMNodeTypes.COMMENT
Absolutely! The node is Comment notation signifies that the primary goal of the function is to verify whether the input parameter belongs to a particular type, in this instance being "Comment".
When isComment function is invoked, it acts as a type predicate. In this scenario, the parameter named node within the current function's signature undergoes type narrowing in Typescript to specifically become of type Comment if it aligns with the initial Node type.
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