formats.exposed/public/gif/constants.js

// @ts-check

/** @enum {string} */
export const GifNodeType = [
  "root",

  "header",
  "headerSignature",
  "headerVersion",

  "logicalScreenDescriptor",
  "logicalScreenWidth",
  "logicalScreenHeight",
  "logicalScreenDescriptorPackedFields",
  "logicalScreenBackgroundColorIndex",
  "logicalScreenPixelAspectRatio",

  "globalColorTable",
  "globalColorTableColor",
].reduce((result, id) => {
  result[id] = id;
  return result;
}, Object.create(null));