TypeScript: Modeling the Language Server Protocol (LSP) Workspace Types

The Language Server Protocol (LSP) is a standardized API for communication between code editors and language servers. To effectively build tools that interact with LSP, it's crucial to accurately represent its data structures in TypeScript. This challenge focuses on implementing a subset of these important workspace-related types.

Problem Description

Your task is to create TypeScript interfaces and types that accurately model key components of the LSP's workspace-related functionalities. Specifically, you need to define types for:

1. WorkspaceFolder: Represents a folder that is part of a workspace.
2. DidChangeWorkspaceFoldersParams: Represents the parameters for the workspace/didChangeWorkspaceFolders notification, which informs the language server about changes to the workspace folders.
3. DidChangeConfigurationParams: Represents the parameters for the workspace/didChangeConfiguration notification, which informs the language server about changes to its configuration.

You should aim for a type-safe and accurate representation of these LSP concepts.

Key Requirements:

• Define a WorkspaceFolder interface.
• Define a DidChangeWorkspaceFoldersParams interface.
• Define a DidChangeConfigurationParams interface.
• Ensure all fields and their types align with the LSP specification (you may need to consult the LSP documentation for exact details).
• Use appropriate TypeScript constructs (e.g., interface, type, enum, string literal types).

Expected Behavior:

The defined types should allow for unambiguous representation of the data exchanged according to the LSP specification for the specified notifications.

Important Edge Cases:

• The workspace/didChangeWorkspaceFolders notification can involve additions and removals of folders. Your types should account for this.
• Configuration changes can be arbitrary JSON data.

Examples

Example 1: WorkspaceFolder

// Assuming you have defined the WorkspaceFolder interface
const folder: WorkspaceFolder = {
  uri: "file:///Users/user/project",
  name: "project"
};

console.log(folder.uri); // Expected: "file:///Users/user/project"
console.log(folder.name); // Expected: "project"

Example 2: DidChangeWorkspaceFoldersParams

// Assuming you have defined the DidChangeWorkspaceFoldersParams interface
const workspaceFoldersChange: DidChangeWorkspaceFoldersParams = {
  event: {
    added: [
      { uri: "file:///Users/user/project/new_module", name: "new_module" }
    ],
    removed: [
      { uri: "file:///Users/user/project/old_module", name: "old_module" }
    ]
  }
};

console.log(workspaceFoldersChange.event.added[0].name); // Expected: "new_module"
console.log(workspaceFoldersChange.event.removed[0].uri); // Expected: "file:///Users/user/project/old_module"

Example 3: DidChangeConfigurationParams

// Assuming you have defined the DidChangeConfigurationParams interface
const configChange: DidChangeConfigurationParams = {
  settings: {
    "eslint": {
      "validate": "on"
    },
    "typescript": {
      "tsdk": "/path/to/tsdk"
    }
  }
};

console.log(configChange.settings.eslint.validate); // Expected: "on"
console.log(configChange.settings.typescript.tsdk); // Expected: "/path/to/tsdk"

Constraints

• The defined types must be valid TypeScript.
• Focus only on the types described above. Do not implement any logic or functions.
• Your solution should be contained within a single TypeScript file.

Notes

• You will need to refer to the official Language Server Protocol specification for the exact structure and types of WorkspaceFolder, DidChangeWorkspaceFoldersParams, and DidChangeConfigurationParams.
• Pay close attention to the uri field, which is a Uniform Resource Identifier.
• The settings field in DidChangeConfigurationParams is a generic JSON object. Consider how to best represent this flexibility in TypeScript.
• Think about how you might define nested types if necessary.