# old/mod.ts
export class Foo {
  name: string = "";
}

# new/mod.ts
export class Foo {
  name: string = "";
  age: number = 0;
}

# output.json
{
  "modifiedModules": {
    "file:///mod.ts": {
      "modified": [
        {
          "name": "Foo",
          "declarations": {
            "modified": [
              {
                "kind": "class",
                "defChanges": {
                  "type": "class",
                  "propertyChanges": {
                    "added": [
                      {
                        "tsType": {
                          "repr": "number",
                          "kind": "keyword",
                          "value": "number"
                        },
                        "name": "age",
                        "location": {
                          "filename": "file:///mod.ts",
                          "line": 2,
                          "col": 2,
                          "byteIndex": 42
                        }
                      }
                    ]
                  }
                }
              }
            ]
          }
        }
      ]
    }
  }
}
