feat: refactoring project

node_modules/terser/lib/compress/drop-unused.js

@@ -103,8 +103,8 @@ import {
     is_empty,
     is_ref_of,
     can_be_evicted_from_block,
-    requires_sequence_to_maintain_binding,
 } from "./common.js";
+import { is_used_in_expression } from "./inference.js";
 
 const r_keep_assign = /keep_assign/;
 
@@ -503,42 +503,3 @@ AST_Scope.DEFMETHOD("drop_unused", function(compressor) {
         }
     }
 });
-
-/**
- * Check if a node may be used by the expression it's in
- * void (0, 1, {node}, 2) -> false
- * console.log(0, {node}) -> true
- */
-function is_used_in_expression(tw) {
-    for (let p = -1, node, parent; node = tw.parent(p), parent = tw.parent(p + 1); p++) {
-        if (parent instanceof AST_Sequence) {
-            const nth_expression = parent.expressions.indexOf(node);
-            if (nth_expression !== parent.expressions.length - 1) {
-                // Detect (0, x.noThis)() constructs
-                const grandparent = tw.parent(p + 2);
-                if (
-                    parent.expressions.length > 2
-                    || parent.expressions.length === 1
-                    || !requires_sequence_to_maintain_binding(grandparent, parent, parent.expressions[1])
-                ) {
-                    return false;
-                }
-                return true;
-            } else {
-                continue;
-            }
-        }
-        if (parent instanceof AST_Unary) {
-            const op = parent.operator;
-            if (op === "void") {
-                return false;
-            }
-            if (op === "typeof" || op === "+" || op === "-" || op === "!" || op === "~") {
-                continue;
-            }
-        }
-        return true;
-    }
-
-    return true;
-}