diff --git a/src/text_completer.js b/src/text_completer.js
index 9fde3b3..46e9ba7 100644
--- a/src/text_completer.js
+++ b/src/text_completer.js
@@ -56,7 +56,7 @@ const KEYWORDS = [
 ];
 
 export class TextCompleter {
-    getCompletions(_editor, session, pos, prefix, callback) {
+    getCompletions(_editor, session, pos, _, callback) {
         // Check if user has written "lib."
         const line = session.doc["$lines"][pos.row].slice(0, pos.column);
         if (line.match(/lib\.\w*$/)) {
@@ -66,6 +66,41 @@ export class TextCompleter {
 
         const locals = [];
         for (let i = 0; i <= pos.row; ++i) {
+            const line = session.doc["$lines"][i].trim();
+            if (line.startsWith("const ") || line.startsWith("let ")) {
+                const [_, name] = line.match(/^\w+ (\w+)/);
+                locals.push(name);
+                continue;
+            }
+
+            if (line.startsWith("function ")) {
+                const lineNoFunction = line.slice("function ".length);
+                const [_, name] = lineNoFunction.match(/^\s*(\w+)/);
+                locals.push(name);
+
+                let local = "";
+                const start = lineNoFunction.indexOf(name) + name.length;
+                for (let i = start; i < lineNoFunction.length; ++i) {
+                    if (lineNoFunction[i].trim() === "") {
+                        continue;
+                    }
+                    const ch = lineNoFunction[i];
+                    if (["{", "=", "}", "(", ")", "[", "]"].includes(ch)) {
+                        continue;
+                    }
+                    if (ch === ",") {
+                        locals.push(local);
+                        local = "";
+                        continue;
+                    }
+                    local += ch;
+                }
+                if (local.trim() !== "") {
+                    locals.push(local);
+                }
+
+                continue;
+            }
         }
 
         const wordList = []
@@ -74,7 +109,6 @@ export class TextCompleter {
                 value: word,
                 score: 0,
                 meta: "local",
-                docHTML: signature,
             })))
             .concat(KEYWORDS.map((word) => ({
                 name: word,