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linting-and-style

Testing & Quality
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Running luacheck for Lua linting and following code style conventions in Edge Driver development

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How to use this skill

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Source SKILL.md: https://github.com/SmartThingsCommunity/SmartThingsEdgeDrivers/blob/HEAD/.agents/skills/linting-and-style/SKILL.md

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Linting and Code Style for Edge Drivers

Running Luacheck

luacheck --config .github/workflows/.luacheckrc <path>

Examples

# Lint a specific driver
luacheck --config .github/workflows/.luacheckrc drivers/SmartThings/zigbee-switch/

# Lint a single file
luacheck --config .github/workflows/.luacheckrc drivers/SmartThings/zigbee-switch/src/init.lua

# Lint the entire repo
luacheck --config .github/workflows/.luacheckrc .

Luacheck runs automatically in CI on pull requests that modify files under drivers/ (see .github/workflows/luacheck.yml).

Code Style Conventions

These conventions are observed across the Edge Driver codebase:

General

  • Indentation: 2 spaces, no tabs
  • Strings: Use double quotes "string" for module requires and general strings
  • Local variables: Always use local for variables and functions at module scope
  • Line length: No enforced limit, but most code stays under 120 characters

Naming

  • Variables and functions: snake_case (e.g., local mock_device, local function test_init())
  • Constants: UPPER_SNAKE_CASE for true constants (e.g., SENSOR_BINARY)
  • Modules: Return a table at the end of the file (return module_name)

Requires and Imports

-- Standard library requires first
local capabilities = require "st.capabilities"
local zw = require "st.zwave"

-- Then test/integration requires
local test = require "integration_test"
local t_utils = require "integration_test.utils"

-- Then protocol-specific requires
local SensorBinary = (require "st.zwave.CommandClass.SensorBinary")({ version = 2 })

Function Style

  • Prefer local function name() over local name = function()
  • Handler functions typically receive (driver, device, ...) arguments
  • Use early returns for guard clauses

Tables

  • Trailing commas are common and acceptable in multi-line tables
  • Align table entries for readability in test manifests

Comments

  • Use -- for single-line comments
  • Minimal inline comments; code should be self-documenting

Copyright header at the top of every file:

-- Copyright 2026 SmartThings, Inc.
-- Licensed under the Apache License, Version 2.0

File Organization for Drivers

driver-name/
  src/
    init.lua           -- Main driver entry point
    <sub_modules>.lua  -- Additional driver modules
    test/
      test_*.lua       -- Test files (must start with test_)
  profiles/
    *.yml              -- Device profiles
  fingerprints.yml     -- Device fingerprints
  config.yml           -- Driver configuration