async function createCesiumJs() {
  let contents = `export const VERSION = '${version}';\n`;

  // Iterate over each workspace and generate declarations for each file.
  for (const workspace of Object.keys(workspaceSourceFiles)) {
    const files = await globby(workspaceSourceFiles[workspace]);
    const declarations = files.map((file) =>
      generateDeclaration(workspace, file),
    );
    contents += declarations.join(`${EOL}`);
    contents += "\n";
  }
  await writeFile("Source/Cesium.js", contents, { encoding: "utf-8" });

  return contents;
}
Creates a single entry point file, Cesium.js, which imports all individual modules exported from the Cesium API.
@returns {Buffer} contents