VSCode 自定义编辑器扩展如何告诉 VSCode 这个编辑器扩展应该被跳过，因为它不支持该文件

Question

I'm writing a VSCode custom editor extension. The extension should be activated for component.yaml files. However I realize that there could be files named component.yaml with completely different formats. I want to detect that the file is not in expected format and bail out, skipping my extension, so that the file opens in the default text editor or another registered extension.

How can my extension refuse/skip opening a file?

Answer 1

An extension cannot refuse to be opened, but you can specify a regular expression for the first line in the file, which has to match to allow your extension to be activate for that file.

{
  "contributes": {
    "languages": [
      {
        "id": "python",
        "extensions": [".py"],
        "aliases": ["Python", "py"],
        "filenames": [],
        "firstLine": "^#!/.*\\bpython[0-9.-]*\\b",
        "configuration": "./language-configuration.json",
        "icon": {
          "light": "./icons/python-light.png",
          "dark": "./icons/python-dark.png"
        }
      }
    ]
  }
}