If you haven't already done so, create a folder that will contain the code samples we'll be working through (the examples use the name book-examples). Open this folder in VS Code, press the F1 key, and select C/Cpp: Edit Configurations… to create a .vscode/c_cpp_properties.json file in the root of your project. It should open the file automatically. Add the following line to the browse.path array: "${env:EMSCRIPTEN}/system/include". This will prevent errors being thrown if you include the emscripten.h header. You may need to manually create the browse object with a path entry if it didn't generate one automatically. The following snippet represents the updated configuration file on Ubuntu:

{
  "name": "Linux",
  "includePath": [
    "/usr/include",
    "/usr/local/include",
    "${workspaceFolder}",
    "${env:EMSCRIPTEN}/system/include"
  ],
  "defines": [],
  "intelliSenseMode": "clang-x64",
  "browse": {
    "path": [
      "/usr/include",
      "/usr/local/include",
      "${workspaceFolder}"
      ],
    "limitSymbolsToIncludedHeaders": true,
    "databaseFilename": ""
  }
}