CodeMetrics installs statistics

Code Metrics - Visual Studio Code Extension

Computes complexity in TypeScript / JavaScript / Lua files.

Complexity calculation

The steps of the calculation:

• create an AST from the input source file
• walk through each and every node of it
• depending on the type of the node and the configuration associated with it create a new entry about the node. This entry contains everything necessary for further use (e.g. a textual representation for the node, complexity increment, child nodes etc.)
• show the sum of complexity of child nodes for methods and the maximum of child nodes for classes

Please note that it is not a standard metric, but it is a close approximation of Cyclomatic complexity.

Please also note that it is possible to balance the complexity calculation for the project / team / personal taste by adjusting the relevant configuration entries (content assist is provided for all of them for easier configuration).

For example if one prefers guard clauses, and is ok with all the branches in switch statements then the following could be applied:

"codemetrics.nodeconfiguration.ReturnStatement": 0,
"codemetrics.nodeconfiguration.CaseClause": 0,
"codemetrics.nodeconfiguration.DefaultClause": 0

If You want to know the causes You can click on the code lens to list all the entries for a given method or class. (This also allows You to quickly navigate to the corresponding code)

It looks like this

Install

How to install Visual Studio Code extensions

Direct link to Visual Studio Code Marketplace

Customization

In the workspace settings one can override the defaults. For a complete list please check the configuration section in the package.json. For the most commonly used ones, one should do a search for codemetrics.basics in the settings ui.

{
  // highest complexity level will be set when it exceeds 15
  "codemetrics.basics.ComplexityLevelExtreme" : 15,

  // Hides code lenses with complexity lesser than the given value
  "codemetrics.basics.CodeLensHiddenUnder" : 5,

  // Description for the highest complexity level
  "codemetrics.basics.ComplexityLevelExtremeDescription" : "OMG split this up!",

  // someone uses 'any', it must be punished
  "codemetrics.nodeconfiguration.AnyKeyword": 100
}

Commands

• Toggle code lenses for arrow functions
• Toggle code metrics

They can be bound in the keybindings.json (File -> Preferences -> Keyboard Shortcuts)

{ "key": "f4",                    "command": "codemetrics.toggleCodeMetricsForArrowFunctions",
                                     "when": "editorTextFocus" },
{ "key": "f5",                    "command": "codemetrics.toggleCodeMetricsDisplayed",
                                     "when": "editorTextFocus" }

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