Missing Compiler API predicate function: isNamedTupleMember

[wessberg]

Search Terms

isNamedTupleMember

Suggestion

TypeScript's Compiler APIs include is functions for all kinds of Nodes. For example, isClassDeclaration, isBigIntLiteral, and so on.

In TypeScript 4.0.1-rc1, a new kind of node is introduced: NamedTupleMember, but no isNamedTupleMember predicate function is exposed. For consistency with other kinds of Nodes, TypeScript should arguably also expose such a predicate function.

Use Cases

• Custom Transformers (visiting and transforming Nodes in an AST)
• Working with the Compiler APIs
• etc

Examples

function visitNode (node: TS.Node, context: TS.TransformationContext, typescript: typeof TS): TS.VisitResult<TS.Node> {
    if (typescript.isNamedTupleMember(node) {
        return visitNamedTupleMember(node, context, typescript);
    }

    else if (...) {
        ....
    }
}

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.