Code Formatting

The Feng CLI does not currently provide feng fmt. Production-ready formatting is available through the Feng extension for VS Code.

Usage

After installing the Feng Language extension, run VS Code's Format Document command in a Feng source file or feng.fm. You can also enable format on save:

{
  "[feng]": {
    "editor.formatOnSave": true
  },
  "[feng-manifest]": {
    "editor.formatOnSave": true
  }
}

Current Formatting Coverage

The Feng source formatter handles:

• Indentation around braces, parentheses, and brackets.
• Trailing whitespace and line endings.
• Spacing around binary, compound-assignment, and shift operators.
• Common spacing for parameters, arguments, type annotations, commas, and object literals.
• Tight spacing for variadic parameters T... and prepacked forwarding ...expr, while preserving one space after a preceding argument comma.

The manifest formatter handles:

• [section] headings.
• Spacing after # in comments.
• Alignment of values in key: "value" entries within a section.

The formatter does not automatically rearrange complex expressions and does not replace semantic checking. After formatting, still run:

feng check

Teams should use the same extension version and follow the Feng Style Guide for naming and structural choices not covered by the formatter.