ဝိက်ရှေန်နရဳ:မဝ်ဂျူဂမၠိုၚ်

	This is a Wiktionary policy, guideline or common practices page. This is a draft proposal. It is unofficial, and it is unknown whether it is widely accepted by Wiktionary editors.
	မူဝါဒ – ပွမဗပေၚ်စုတ်: CFI - EL - NORM - NPOV - QUOTE - REDIR - DELETE. အရေဝ်ဘာသာ: LT - AXX. တၞဟ်: BLOCK - BOTS - VOTES.

Debugging and error reporting

When Lua encounters an error in a script, it aborts the script and shows "Module error" in large red, clickable text on the page. Click on this text in order to see what caused the error.

A module error also adds the page to Category:Pages with module errors. When writing modules or converting templates, it is a good idea to check this category to see whether any pages that use it are triggering errors. It is also possible to trigger errors yourself, using the following:

error("You forgot to supply a required parameter!")

This can be used to check whether a module and its accompanying template(s) are being used correctly, and to show an error to the user otherwise. It is highly recommended that you use this whenever possible, to make your modules more robust and to make it easier to find mistakes.

While you are working on a script, it may occasionally be useful to generate debug messages so that you can see what is going on at particular points in your script. You can do this with the mw.log function:

mw.log("Testing the script. The value of the variable 'a' is : " .. a)

This function will output its argument to the Scribunto debug console if you run the module in the debug console, e.g. by typing p.main() if the function you want to run is named main and takes no arguments. It automatically adds a newline to the end of the message.

The function os.clock can be used for simple benchmarking of a given function. It can be used like this:

function p.foo(frame)
    local start = os.clock()
    -- do whatever the function needs to do here
    mw.log("Function took " .. os.clock() - start .. " seconds.")
    -- return
end

An error also occurs when the time allocated for running scripts expires before all scripts on a page can be run. If you are making a complex and potentially time-consuming edit to a module, you can use the "Preview page with this template" to preview a very large, module-heavy page like [[a]] to check if your script slows it down too much.

English Wiktionary also has its own purpose-made debugging module, aptly named Module:debug. The function track can be used to track entries that fulfill a particular condition without interfering with the operation of a function or template. It is similar in purpose to Category:Template tracking.