[BUG][code-analyzer] regex:NoMixedIndentation: False positive on ApexDocs

Start by locating the implementation and tests for the regex:NoMixedIndentation rule, then reproduce the reported Apex class and method-level ApexDoc example. The fix is done when ApexDoc indentation is ignored while other mixed tabs and spaces still produce violations, with the relevant tests passing.

Have you tried to resolve this issue yourself first?

• I confirm I have gone through the above steps and still have an issue to report.

Bug Description

v5.11.0 seems to have introduced a new regex:NoMixedIndentation rule, which flags apex files that use a mixture of tabs and spaces for indentation. However, this is causing false positive results on method-level ApexDoc comments, example below:

/**
 * @description An example of a class-level ApexDoc
 */
public class SomeApexClass {
	/**
	 * @description An example of a method-level ApexDoc
	 * @param bar Some input parameter
	 * @return Some output parameter
	 */
	public Object foo(Object bar) {
		return null; // Not important...
	}
}

ApexDocs are an officially supported comment format, so it doesn't make sense for these to be flagged as a violation.

Output / Logs

jsiders@jsiders-mac salesforce % sf plugins install code-analyzer@5.10.0  
removed 4 packages in 6s
@salesforce/cli: Installing plugin code-analyzer@5.10.0... installed v5.10.0

jsiders@jsiders-mac salesforce % sf code-analyzer run -t force-app/main/default/classes/SomeApexClass.cls

Streaming logs in real time to:
    /var/folders/8d/0t7sckgj10xcb32zycf088480000gp/T/sfca-2026_03_24_10_52_21_277.log

Selecting rules... done.
Executing rules... done. Executed rules from cpd, pmd, regex.

=== Summary

Found 0 violations.

Additional log information written to:
    /var/folders/8d/0t7sckgj10xcb32zycf088480000gp/T/sfca-2026_03_24_10_52_21_277.log

jsiders@jsiders-mac salesforce % sf plugins install code-analyzer@5.11.0                                 
Polling for new version(s) to become available on npm... done
Successfully validated digital signature for @salesforce/plugin-code-analyzer.
Finished digital signature check.
npm warn deprecated rimraf@3.0.2: Rimraf versions prior to v4 are no longer supported
npm warn deprecated eslint@8.57.1: This version is no longer supported. Please see https://eslint.org/version-support for other options.
added 15 packages, removed 51 packages, and changed 93 packages in 8s
@salesforce/cli: Installing plugin code-analyzer@5.11.0... installed v5.11.0

jsiders@jsiders-mac salesforce % sf code-analyzer run -t force-app/main/default/classes/SomeApexClass.cls

Streaming logs in real time to:
    /var/folders/8d/0t7sckgj10xcb32zycf088480000gp/T/sfca-2026_03_24_10_50_59_383.log

Selecting rules... done.
Code Analyzer [10:51:1.984]:
    No violations were suppressed by inline suppression markers.

Executing rules... done. Executed rules from regex, cpd, pmd.

Violation file paths relative to '/Users/jsiders/Documents/VSCode/Nasuni/salesforce/force-app/main/default/classes'.
  #   Severity       Rule                       Location                Message                                                                                     
 ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
  1   3 (Moderate)   regex:NoMixedIndentation   SomeApexClass.cls:6:1   Leading indentation contains mixed spaces and tabs. To fix this, use either spaces or tabs.
  2   3 (Moderate)   regex:NoMixedIndentation   SomeApexClass.cls:7:1   Leading indentation contains mixed spaces and tabs. To fix this, use either spaces or tabs.
  3   3 (Moderate)   regex:NoMixedIndentation   SomeApexClass.cls:8:1   Leading indentation contains mixed spaces and tabs. To fix this, use either spaces or tabs.
  4   3 (Moderate)   regex:NoMixedIndentation   SomeApexClass.cls:9:1   Leading indentation contains mixed spaces and tabs. To fix this, use either spaces or tabs.



=== Summary

Found 4 violation(s) across 1 file(s):
    4 Moderate severity violation(s) found.

Additional log information written to:
    /var/folders/8d/0t7sckgj10xcb32zycf088480000gp/T/sfca-2026_03_24_10_50_59_383.log

Steps To Reproduce

1. Create an Apex class which implements a method-level ApexDoc comment block (example above)
2. Install code-analyzer@5.10.0
3. Run code-analyzer against the apex class
4. Observe 0 violations
5. Install code-analyzer@5.11.0
6. Run code-analyzer against this same class
7. Observe 1 regex:NoMixedIndentation violation (moderate) for each line of the method-level ApexDoc comment.

Expected Behavior

ApexDocs should not trigger this violation.

All other instances of mixed tabs/spaces should trigger this violation.

Operating System

macOS Tahoe 26.3

Salesforce CLI Version

@salesforce/cli/2.126.4 darwin-arm64 node-v22.20.0

Code Analyzer Plugin (code-analyzer) Version

5.11.0

Node Version

v22.20.0

Java Version

openjdk version "17.0.13" 2024-10-15

Python Version

Python 3.13.1

Additional Context (Screenshots, Files, etc)

No response

Workaround

Reduce the severity of the rule to Low or Info, though this is not ideal for users who wish to report genuine violations.

Urgency

Low