Forceignore does not support exclamation point "!"

[petter-eikeland]

Summary

According to the docs, forceignore should mimic gitignore. Gitignore supports using exclamation points to negate a certain pattern, e.g. for individual files or subdirectories: https://git-scm.com/docs/gitignore
It would be very useful if forceignore could support the same

Steps To Reproduce

1. Clone into dreamhouse-lwc
2. Create scratch org
3. Try to deploy using sf project deploy start -d issues/exclamation-ignore-bug

Expected result

Account.TestField1__c should have been deployed, and Account.TestField2__c should be ignored.
Because the following lines were added to .forceignore:

issues/exclamation-ignore-bug/objects
!issues/exclamation-ignore-bug/objects/Account/fields/TestField1__c.field-meta.xml

Actual result

Both Account.TestField1__c & Account.TestField2__c was ignored. No changes was deployed

System Information

{
  "architecture": "darwin-arm64",
  "cliVersion": "@salesforce/cli/2.24.4",
  "nodeVersion": "node-v20.10.0",
  "osVersion": "Darwin 22.6.0",
  "rootPath": "/Users/user/.local/share/sf/client/2.24.4-c9898a2",
  "shell": "zsh",
  "pluginVersions": [
    "@oclif/plugin-autocomplete 3.0.5 (core)",
    "@oclif/plugin-commands 3.1.0 (core)",
    "@oclif/plugin-help 6.0.10 (core)",
    "@oclif/plugin-not-found 3.0.8 (core)",
    "@oclif/plugin-plugins 4.1.15 (core)",
    "@oclif/plugin-search 1.0.11 (core)",
    "@oclif/plugin-update 4.1.7 (core)",
    "@oclif/plugin-version 2.0.11 (core)",
    "@oclif/plugin-warn-if-update-available 3.0.9 (core)",
    "@oclif/plugin-which 3.0.14 (core)",
    "@salesforce/cli 2.24.4 (core)",
    "1commerce 0.0.10 (user)",
    "apex 3.0.17 (core)",
    "auth 3.2.0 (core)",
    "community 3.0.12 (user)",
    "data 3.0.14 (core)",
    "deploy-retrieve 3.1.0 (core)",
    "info 3.0.15 (core)",
    "limits 3.1.2 (core)",
    "marketplace 1.0.16 (core)",
    "org 3.2.2 (core)",
    "packaging 2.1.0 (user)",
    "schema 3.1.0 (core)",
    "settings 2.0.15 (core)",
    "signups 2.0.15 (user)",
    "sobject 1.1.0 (core)",
    "source 3.1.3 (core)",
    "telemetry 3.1.9 (core)",
    "templates 56.0.9 (core)",
    "trust 3.3.1 (core)",
    "user 3.2.1 (core)",
    "@salesforce/sfdx-plugin-lwc-test 1.1.1 (user)",
    "sfdmu 4.32.2 (user)",
    "sfdx-browserforce-plugin 4.0.0 (user)"
  ]
}

[github-actions]

Thank you for filing this issue. We appreciate your feedback and will review the issue as soon as possible. Remember, however, that GitHub isn't a mechanism for receiving support under any agreement or SLA. If you require immediate assistance, contact Salesforce Customer Support.

[shetzel]

The CLI uses this library for the .forceignore implementation: https://github.com/kaelzhang/node-ignore

According to this closed issue on their repo, your usecase is working as designed:
kaelzhang/node-ignore#79 (comment)

If you feel there is something we can do about this please reopen.