visitor of visitEachChild doesn't support returning InferTypeNode

[marcus-sa]

🔎 Search Terms

False expression: Unexpected node
Node InferType did not pass test 'isEntityName'.

🕗 Version & Regression Information

⏯ Playground Link

No response

💻 Code

https://github.com/marcus-sa/deepkit-framework/blob/9c9eb001459a4e1046aea94cb531ba5d8ca3b1c9/packages/type-compiler/src/compiler.ts#L2353-L2370

🙁 Actual behavior

Visitor callback of visitEachChild doesn't support returning InferTypeNode when the node is a TypeReferenceNode

Verbose Debug Information: Node InferType did not pass test 'isEntityName'.
           at visitNode (/Users/marcus-sa/Git/deepkit/deepkit-framework/node_modules/typescript/lib/typescript.js:87180:11)
           at visitEachChildOfTypeReferenceNode (/Users/marcus-sa/Git/deepkit/deepkit-framework/node_modules/typescript/lib/typescript.js:87589:32)
           at visitEachChild (/Users/marcus-sa/Git/deepkit/deepkit-framework/node_modules/typescript/lib/typescript.js:87421:35)
           at ReflectionTransformer.resolveTypeParameter (file:///Users/marcus-sa/Git/deepkit/deepkit-framework/packages/type-compiler/dist/esm/src/compiler.js:1910:54)

🙂 Expected behavior

For it to work

[marcus-sa]

The following patch fixes it (or at least works around it):

diff --git a/node_modules/typescript/lib/typescript.js b/node_modules/typescript/lib/typescript.js
index 86ab90b..dc72ecb 100644
--- a/node_modules/typescript/lib/typescript.js
+++ b/node_modules/typescript/lib/typescript.js
@@ -87586,7 +87586,7 @@ ${lanes.join("\n")}
         [183 /* TypeReference */]: function visitEachChildOfTypeReferenceNode(node, visitor, context, nodesVisitor, nodeVisitor, _tokenVisitor) {
           return context.factory.updateTypeReferenceNode(
             node,
-            Debug.checkDefined(nodeVisitor(node.typeName, visitor, isEntityName)),
+            Debug.checkDefined(nodeVisitor(node.typeName, visitor, node => isTypeNode(node) || isEntityName(node))),
             nodesVisitor(node.typeArguments, visitor, isTypeNode)
           );
         },

[marcus-sa]

@andrewbranch where are we with this? I would gladly make a PR.

[rbuckton]

A TypeReferenceNode shouldn't have an InferTypeNode in its typeName property, so the error you see is correct and indicates a problem in your code. Looking at the code you linked to, I believe you are incorrectly updating the tree with a node in an invalid position. You shouldn't be replacing an Identifier with an InferTypeNode, you should be looking for the TypeReferenceNode containing that identifier and replace it instead.

const searchArgument = (node: Node): Node => {
    node = visitEachChild(node, searchArgument, this.context);

    if (isTypeReferenceNode(node) && isIdentifier(node.typeName) && node.typeName.escapedText === argumentName) {
        //transform to infer T
        found = true;
        node = this.f.createInferTypeNode(declaration);
    }

    return node;
};

[marcus-sa]

@rbuckton thanks a lot!