[Bug]: Resource type completions are not displayed in JSON

[Ben-Wormald]

Describe the bug

Expected resource type completions are not displayed by editors (observed in VS Code and Zed) in JSON CloudFormation templates. This seems to be because the returned range for each completion (specifically textEdit.range.end.character) is longer than expected and is rejected by the editors.

Steps to reproduce

1. Create a basic JSON CloudFormation template with an empty resource entry:

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "MyTestResource": {
    }
  }
}

2. Trigger a resource type completion:

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "MyTestResource": {
      "Type": "
    }
  }
}

3. No completions are suggested

Expected behavior

Completions are suggested with available resources (AWS::ACMPCA::Certificate etc.)

CloudFormation template (if applicable)

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "MyTestResource": {
      "Type": ""
    }
  }
}

Language Server version

1.4.0

Editor/IDE

VSCode 1.109.5, Zed 0.224.11

Operating System

macOS

Node.js version

v24.13.0

Logs

This is from Zed's logs, no relevant logs from the language server itself:


INFO  [project::lsp_command] completion out of expected range, start: PointUtf16 { row: 14, column: 8 }, end: PointUtf16 { row: 14, column: 8 }, range: Unclipped(PointUtf16 { row: 14, column: 8 })..Unclipped(PointUtf16 { row: 14, column: 9 })

Additional context

No response