Atempting to use registerTextSearchProvider

[StefanDBTLabs]

Trying to use vscode.workspace.registerTextSearchProvider('file', provider) but getting this error:

extensions.js:187 Uncaught (in promise) Error: Extension 'nullExtensionDescription' CANNOT use API proposal: textSearchProvider.
Its package.json#enabledApiProposals-property declares: [] but NOT textSearchProvider.
 The missing proposal MUST be added and you must start in extension development mode or use the following command line switch: --enable-proposed-api nullExtensionDescription

I have set these values in package.json which is used as the manifest for the extention

  "enabledApiProposals": [
    "textSearchProvider"
  ],
  "contributes": {
    "search": [
      {
        "scheme": "file"
      }
    ],

which I pass in to the registerExtension like this

import manifest from './package.json';

const { registerFileUrl, whenReady } = registerExtension(
  manifest,
  ExtensionHostKind.LocalProcess,
);

are there other things i need to do to allow me to register and use this provider?

[CGNonofr]

Not every extension can declare and use api proposals, only:

• the built-in ones
  • You can make your extension considered built-in by providing { system: true } in the last parameter of registerExtension
• the one allowed in the productConfiguration
  • In the initialize method, you can provide some options, which includes productConfiguration, which can contain some extensionEnabledApiProposals

[StefanDBTLabs]

thanks!