fails to parse types from declaration files (`*.d.ts`)

[robcmills]

Summary

ts-json-schema-generator fails to parse types from declaration files (*.d.ts).

Repro

With the following minimal repro:

// declaration.d.ts
declare type Model = string;

// ForgeElementOverlay.ts
export interface ForgeElementOverlay {
  model: Model;
}

// main.ts
import { createGenerator } from './factory/generator';

const config = {
    path: "ForgeElementOverlay.ts",
    skipTypeCheck: true,
    tsconfig: "tsconfig.json",
    type: "*",
};

const schema = createGenerator(config).createSchema(config.type);

where tsconfig.json is identical to the one used by the ts-json-schema-generator package:
https://github.com/vega/ts-json-schema-generator/blob/next/tsconfig.json

and main.ts is run with Bun v1.1.42

The following error is thrown:

~/src/ts-json-schema-generator [next]
» bun run main.ts
19 |  */
20 | export abstract class BaseError extends Error {
21 |     readonly diagnostic: ts.Diagnostic;
22 | 
23 |     constructor(diagnostic: PartialDiagnostic) {
24 |         super(ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n"));
             ^
error: Unhandled error while creating Base Type.
      at new BaseError (/Users/robcmills/src/ts-json-schema-generator/src/Error/BaseError.ts:24:9)
      at new UnhandledError (/Users/robcmills/src/ts-json-schema-generator/src/Error/Errors.ts:112:9)
      at from (/Users/robcmills/src/ts-json-schema-generator/src/Error/Errors.ts:121:53)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/ChainNodeParser.ts:39:38)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/AnnotatedNodeParser.ts:34:47)
      at /Users/robcmills/src/ts-json-schema-generator/src/NodeParser/InterfaceAndClassNodeParser.ts:146:46
      at map (1:11)
      at getProperties (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/InterfaceAndClassNodeParser.ts:142:14)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/InterfaceAndClassNodeParser.ts:48:33)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/AnnotatedNodeParser.ts:34:47)

76 |         if (typeSymbol.name === "URL") {
77 |             return new AnnotatedType(new StringType(), { format: "uri" }, false);
78 |         }
79 | 
80 |         return this.childNodeParser.createType(
81 |             typeSymbol.declarations!.filter((n: ts.Declaration) => !invalidTypes[n.kind])[0],
                            ^
TypeError: undefined is not an object (evaluating 'typeSymbol.declarations.filter')
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/TypeReferenceNodeParser.ts:81:24)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/ChainNodeParser.ts:37:49)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/AnnotatedNodeParser.ts:34:47)
      at /Users/robcmills/src/ts-json-schema-generator/src/NodeParser/InterfaceAndClassNodeParser.ts:146:46
      at map (1:11)
      at getProperties (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/InterfaceAndClassNodeParser.ts:142:14)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/InterfaceAndClassNodeParser.ts:48:33)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/NodeParser/AnnotatedNodeParser.ts:34:47)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/ExposeNodeParser.ts:23:45)
      at createType (/Users/robcmills/src/ts-json-schema-generator/src/CircularReferenceNodeParser.ts:24:43)

Bun v1.1.42 (macOS arm64)

On the surface, I found this is because typeSymbol.declarations is undefined, for the declared Model type.

I haven't dug any deeper than this.

Additional info

Of note, typescript-json-schema handles this case without error, however the generated schema for the declared type is empty:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "definitions": {
    "Model": {},
    "ForgeElementOverlay": {
      "type": "object",
      "properties": {
        "model": {
          "$ref": "ospace#/definitions/Model"
        },
      },
      "required": [
        "model",
      ]
    },
  },
}

This would be a sufficient workaround for our use case.