diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 6be554a2..521b1e9a 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -6,6 +6,10 @@
   - Add note about linking/using templates (html and latex) with pandoc.
   - Add references to argmap specs spreadsheet?
 
+## argmap 20.0.2
+
+- `src/lua`: Fix #18 and other lint errors, mainly by making functions local or adding them to an object.
+
 ## argmap 20.0.1
 
 - `mapjs/package.json`: Update dev dependencies to latest version.
diff --git a/src/lua/argmap2mup.lua b/src/lua/argmap2mup.lua
index 91e0c619..ab451a28 100755
--- a/src/lua/argmap2mup.lua
+++ b/src/lua/argmap2mup.lua
@@ -457,7 +457,7 @@ local function default_to_nil(var)
   return var
 end
 
-function pipe_in_out(cmd, s)
+local function pipe_in_out(cmd, s)
   -- a function for piping through unix commands
   local tmp = os.tmpname()
   local tmpout = os.tmpname()
@@ -480,14 +480,14 @@ local function trim(s)
   return (s:gsub("\n", ""))
 end
 
-function markdown_to_plain(s)
+local function markdown_to_plain(s)
   if Script_context == 'client' then
     return s
   end
   return trim(pipe_in_out("pandoc --wrap=none -t plain -f markdown", s))
 end
 
-function parse_special(t, s)
+local function parse_special(t, s)
   -- a function for parsing notes, labels, and strengths
   for i, v in pairs(t) do
     if string.match(i, "^" .. s .. "$") then
@@ -541,7 +541,7 @@ function a2m.parse_claims(t)
           ["title"] = claim,
           ["id"] = gid,
           ["attr"] = default_to_nil(attr), -- default_to_nil(attr) stops empty attr breaking json output.
-          ["ideas"] = parse_reasons(v)
+          ["ideas"] = a2m.parse_reasons(v)
         }
       end
     end
@@ -550,7 +550,7 @@ function a2m.parse_claims(t)
   return default_to_nil(o)
 end
 
-function parse_reasons(t)
+function a2m.parse_reasons(t)
   local o = {}
   local n = 0
   for i, v in pairs(t) do
@@ -578,7 +578,7 @@ function parse_reasons(t)
   return default_to_nil(o)
 end
 
-function help()
+local function help()
   return [[argmap2mup <options> <file>
    -u, --upload           :  upload to Google Drive
    -g ID, --gdrive_id ID  :  update file with ID on Google Drive
@@ -588,7 +588,7 @@ function help()
    -h, --help]]
 end
 
-function parse_options(a)
+local function parse_options(a)
   local opts        = {}
   local flags, args = pl.app.parse_args(a, { g = true, gdrive_id = true, n = true, name = true, f = true, folder = true })
 
@@ -621,7 +621,7 @@ function parse_options(a)
   return opts
 end
 
-function main()
+local function main()
   -- print(args) -- What is this line for? Debugging?
   Logger:debug("arg: ")
   Logger:debug(arg)
diff --git a/src/lua/argmap2tikz.lua b/src/lua/argmap2tikz.lua
index f36e2f50..a5219692 100755
--- a/src/lua/argmap2tikz.lua
+++ b/src/lua/argmap2tikz.lua
@@ -17,6 +17,8 @@ local pl    = require 'pl.import_into' ()
 -- uses lyaml to parse yaml
 local lyaml = require "lyaml"
 
+local a2t = {}
+
 -- initialize a global counter for providing unique ids for each node
 local gn = 0
 -- initialize an indent so our output is human readable
@@ -69,8 +71,8 @@ local styles = [=[
     implicit/.style={dashed}
 ]=]
 
-function pipe_in_out(cmd, s)
-    -- a function for piping through unix commands
+-- a function for piping through unix commands
+local function pipe_in_out(cmd, s)
     local tmp = os.tmpname()
     local tmpout = os.tmpname()
     local f = assert(io.open(tmp, 'w'))
@@ -88,13 +90,13 @@ local function trim(s)
     return (s:gsub("\n", ""))
 end
 
-function markdown_to_latex(s)
+local function markdown_to_latex(s)
     return trim(pipe_in_out("pandoc --wrap=none -t latex -f markdown", s))
 end
 
--- TODO: enable parsing of notes
-function parse_special(t, s)
-    -- a function for parsing notes, labels, and strengths
+-- a function for parsing notes, labels, and strengths
+--  TODO: enable parsing of notes
+local function parse_special(t, s)
     for i, v in pairs(t) do
         if string.match(i, "^" .. s .. "$") then
             return v
@@ -103,8 +105,8 @@ function parse_special(t, s)
     return nil
 end
 
-function parse_claims(t)
-    -- a function that parses claims
+-- a function that parses claims
+local function parse_claims(t)
     local o = ""
     indent = indent + 2
     for i, v in pairs(t) do
@@ -131,15 +133,15 @@ function parse_claims(t)
             -- construct the claim in tikz, e.g,: c1/"Eating meat is morally acceptable"[claim, implicit]
             local claimline = string.rep(" ", indent) .. "c" .. gid .. "/\"" .. claim .. "\"[" .. attr .. "]"
             -- parse the reasons for the claim, and add the result to output.
-            o = o .. parse_reasons(v, claimline)
+            o = o .. a2t.parse_reasons(v, claimline)
         end
     end
     indent = indent - 2
     return o
 end
 
-function parse_reasons(t, claimline)
-    -- function that parses reasons for a claim and returns the appropriate tikz
+-- function that parses reasons for a claim and returns the appropriate tikz
+function a2t.parse_reasons(t, claimline)
     -- initialize output string
     local o = ""
     indent = indent + 2
@@ -200,8 +202,8 @@ function parse_reasons(t, claimline)
     return o
 end
 
-function create_graph(t)
-    -- parse the map and generate the tikz \graph
+-- parse the map and generate the tikz \graph
+local function create_graph(t)
     local o = string.rep(" ", indent) .. "\\graph [layered layout, " ..
         "grow down, " ..
         "level distance=5em, " ..
@@ -214,8 +216,8 @@ function create_graph(t)
     return o
 end
 
-function create_tikzpicture(t)
-    -- generate the tikz \graph and wrap in a tikzpicture environment
+-- generate the tikz \graph and wrap in a tikzpicture environment
+local function create_tikzpicture(t)
     -- TODO: is there more appropriate way to specify rounded corners other than calling pdfsetcornerarced?
     indent = indent + 2
     local o = "\\begin{tikzpicture}\n" ..
@@ -228,8 +230,8 @@ function create_tikzpicture(t)
     return o
 end
 
-function create_texdocument(t)
-    -- generate a the tikzpicture and wrap it in a standalone tex document
+-- generate a the tikzpicture and wrap it in a standalone tex document
+local function create_texdocument(t)
     local documentclass = [[\documentclass[tikz]{standalone}]]
     return "\\documentclass[tikz]{standalone}\n" ..
         includes .. "\n" ..
@@ -238,7 +240,7 @@ function create_texdocument(t)
         "\\end{document}"
 end
 
-function help()
+local function help()
     return [[argmap2tikz <options> <file>
    -s, --standalone: generate standalone tex file
    -i, --includes:   dump includes required for tex preamble
@@ -246,7 +248,7 @@ function help()
    -h, --help:       help]]
 end
 
-function parse_options(a)
+local function parse_options(a)
     local opts = {}
     local flags, args = pl.app.parse_args(a)
     opts["standalone"] = flags["s"] or flags["standalone"]
@@ -259,7 +261,7 @@ function parse_options(a)
     return opts
 end
 
-function main()
+local function main()
     local opts = parse_options(arg)
     if opts["help"] then
         return help()
@@ -288,3 +290,5 @@ function main()
 end
 
 print(main())
+
+return a2t
diff --git a/src/lua/mup2argmap.lua b/src/lua/mup2argmap.lua
index cc298a65..62e9ced7 100755
--- a/src/lua/mup2argmap.lua
+++ b/src/lua/mup2argmap.lua
@@ -11,6 +11,8 @@ local lyaml   = require 'lyaml'
 local json    = require 'rxi-json-lua'
 local logging = require 'logging'
 
+local m2a = {}
+
 -- [LuaLogging: A simple API to use logging features in Lua](https://neopallium.github.io/lualogging/manual.html#introduction)
 local logger = logging.new(function(self, level, message)
     io.stderr:write(message)
@@ -24,7 +26,7 @@ end)
 --   https://www.lua.org/manual/5.3/manual.html#6.10
 logger:setLevel(logging.ERROR)
 
-function dig_in(table, fields)
+local function dig_in(table, fields)
     local t = table
     local result = true
     for _, f in pairs(fields) do
@@ -42,7 +44,7 @@ function dig_in(table, fields)
     end
 end
 
-function parse_claims(claims, strength, label)
+local function parse_claims(claims, strength, label)
     local argmap = {}
     if strength then
         argmap["strength"] = strength
@@ -59,7 +61,7 @@ function parse_claims(claims, strength, label)
         local note = dig_in(items, { "attr", "note", "text" })
         local reasons = {}
         if items["ideas"] then
-            reasons = parse_reasons(items["ideas"], note)
+            reasons = m2a.parse_reasons(items["ideas"], note)
         elseif note then
             reasons = reasons["note"]
         end
@@ -68,7 +70,7 @@ function parse_claims(claims, strength, label)
     return argmap
 end
 
-function parse_reasons(reasons, note)
+function m2a.parse_reasons(reasons, note)
     local argmap = {}
     argmap["note"] = note
     for index, items in pairs(reasons) do
@@ -90,14 +92,14 @@ function parse_reasons(reasons, note)
     return argmap
 end
 
-function help()
+local function help()
     return [[mup2argmap <options> <file>
   -e, --embed:      wrap in code block for embedding in pandoc markdown 
   -g, --gdrive_id:  parse mup file with corresponding Google Drive ID
   -h:               show this help]]
 end
 
-function parse_options(a)
+local function parse_options(a)
     local opts = {}
     local flags, args = pl.app.parse_args(a, { g = true, gdrive_id = true })
     opts["help"] = flags["h"] or flags["help"]
@@ -112,7 +114,7 @@ function parse_options(a)
     return opts
 end
 
-function main()
+local function main()
     local opts = parse_options(arg)
     if opts["help"] then
         return help()
@@ -150,3 +152,5 @@ end
 
 -- TODO is print best practice for this purpose?
 print(main())
+
+return m2a
\ No newline at end of file