Function ExpressionStatement

tools/acorn-optimizer.mjs:272–277

(node, _c)

          }
        },
        ExpressionStatement(node, _c) {
          if (aggressive && !hasSideEffects(node)) {
            emptyOut(node);
            removed++;
          }
        },
        FunctionDeclaration(node, _c) {
          if (names.has(node.id.name)) {
            removed++;