test.ts

import { Project } from "ts-morph";

const tsAstProject = new Project();
const sourceFile = tsAstProject.createSourceFile('testfile.js', getSourceText());

// Just calling the below method is what causes the problem when moving later. 
// If this line is commented out, the move succeeds.
sourceFile.getClass( 'TableHeader' )!;

sourceFile.move('testfile.tsx');


function getSourceText() {
    return `
        class TableHeader extends React.Component {
            renderHeader() {
                const mapArr = this.props.columns
                    .map(columnDef => (
                        <div>
                            {(columnDef.sort !== false)
                                ? 'test'
                                : 'title'
                            }
                        </div>
                    ));

                return mapArr;
            }
        }
    `;
}