fix(docs): createTypeReferenceNode in transform examples

[danmichaelo]

Changes

Fixes #1688

How to Review

Verify example from docs:

# test1.ts
import path from "node:path";
import { fileURLToPath } from "node:url";
import openapiTS, { astToString } from "openapi-typescript";
import ts from "typescript";

const BLOB = ts.factory.createTypeReferenceNode(ts.factory.createIdentifier("Blob")); // `Blob`
const NULL = ts.factory.createLiteralTypeNode(ts.factory.createNull()); // `null`

const baseDir = path.dirname(fileURLToPath(import.meta.url));
const mySchema = new URL(path.resolve(baseDir, "../test1.yaml"), import.meta.url);

const ast = await openapiTS(mySchema, {
  transform(schemaObject, metadata) {
    if (schemaObject.format === "binary") {
      return {
        schema: schemaObject.nullable ? ts.factory.createUnionTypeNode([BLOB, NULL]) : BLOB,
        questionToken: true,
      };
    }
  },
});

console.log(astToString(ast));

using a minimal example:

# test1.yaml
openapi: "3.0"
paths:
  /test:
    post:
      requestBody:
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                source:
                  type: string
                file:
                  type: string
                  format: binary

Checklist

• docs/ updated (if necessary)

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[drwpow]

Thank you!