Feat: Performance enhancements

packages/cva/package.json

@@ -55,6 +55,7 @@
     "bundlesize": "0.18.2",
     "react": "18.2.0",
     "react-dom": "18.2.0",
+    "tinybench": "^2.8.0",
     "ts-node": "10.9.2",
     "typescript": "5.7.3"
   },

packages/cva/src/benchmark.ts

@@ -0,0 +1,162 @@
+import { Bench } from "tinybench";
+
+import { defineConfig as originalDefineConfig } from "./old-index";
+import { defineConfig as enhancedDefineConfig } from "./index";
+
+function logResultsTable(bench: Bench) {
+  const table: any[] = [];
+
+  for (const task of bench.tasks) {
+    if (!task.result) continue;
+    table.push({
+      name: task.name,
+      "ops/sec": task.result.error ? 0 : task.result.hz,
+      "average (ms)": task.result.error ? "NaN" : task.result.mean.toFixed(3),
+      samples: task.result.error ? "NaN" : task.result.samples.length,
+    });
+  }
+
+  const results = table
+    .map((x) => ({
+      ...x,
+      "ops/sec": parseFloat(parseInt(x["ops/sec"].toString(), 10).toString()),
+    }))
+    .sort(
+      (a: Record<string, number>, b: Record<string, number>) =>
+        b["ops/sec"] - a["ops/sec"],
+    );
+
+  const maxOps = Math.max(...results.map((x) => x["ops/sec"]));
+
+  console.table(
+    results.map((x, i) => ({
+      ...x,
+      [`relative to ${results[0]["name"]}`]:
+        i === 0
+          ? ""
+          : `${(maxOps / parseInt(x["ops/sec"])).toFixed(2)} x slower`,
+    })),
+  );
+}
+
+const originalCVA = originalDefineConfig().cva;
+const enhancedCVA = enhancedDefineConfig().cva;
+
+const buttonWithoutBaseWithDefaultsWithClassNameString = {
+  base: "button font-semibold border rounded",
+  variants: {
+    intent: {
+      unset: null,
+      primary:
+        "button--primary bg-blue-500 text-white border-transparent hover:bg-blue-600",
+      secondary:
+        "button--secondary bg-white text-gray-800 border-gray-400 hover:bg-gray-100",
+      warning:
+        "button--warning bg-yellow-500 border-transparent hover:bg-yellow-600",
+      danger: [
+        "button--danger",
+        [
+          1 && "bg-red-500",
+          { baz: false, bat: null },
+          ["text-white", ["border-transparent"]],
+        ],
+        "hover:bg-red-600",
+      ],
+    },
+    disabled: {
+      unset: null,
+      true: "button--disabled opacity-050 cursor-not-allowed",
+      false: "button--enabled cursor-pointer",
+    },
+    size: {
+      unset: null,
+      small: "button--small text-sm py-1 px-2",
+      medium: "button--medium text-base py-2 px-4",
+      large: "button--large text-lg py-2.5 px-4",
+    },
+    m: {
+      unset: null,
+      0: "m-0",
+      1: "m-1",
+    },
+  },
+  compoundVariants: [
+    {
+      intent: "primary",
+      size: "medium",
+      className: "button--primary-medium uppercase",
+    },
+    {
+      intent: "warning",
+      disabled: false,
+      className: "button--warning-enabled text-gray-800",
+    },
+    {
+      intent: "warning",
+      disabled: true,
+      className: [
+        "button--warning-disabled",
+        [1 && "text-black", { baz: false, bat: null }],
+      ],
+    },
+    {
+      intent: ["warning", "danger"],
+      className: "button--warning-danger !border-red-500",
+    },
+    {
+      intent: ["warning", "danger"],
+      size: "medium",
+      className: "button--warning-danger-medium",
+    },
+  ],
+  defaultVariants: {
+    m: 0,
+    disabled: false,
+    intent: "primary",
+    size: "medium",
+  },
+} as any;
+
+async function run() {
+  const benchmark = new Bench({ time: 5000 });
+
+  benchmark.add("cva/main", () => {
+    const buttonVariants = originalCVA(
+      buttonWithoutBaseWithDefaultsWithClassNameString,
+    );
+    buttonVariants({});
+    buttonVariants({ intent: "primary", disabled: true } as any);
+    buttonVariants({ intent: "primary", size: "medium" } as any);
+    buttonVariants({
+      intent: "warning",
+      size: "medium",
+      disabled: true,
+    } as any);
+    buttonVariants({ size: "small" } as any);
+    buttonVariants({ size: "large", intent: "unset" } as any);
+  });
+
+  benchmark.add("feat/performance-enhancement", () => {
+    const buttonVariants = enhancedCVA(
+      buttonWithoutBaseWithDefaultsWithClassNameString,
+    );
+    buttonVariants({});
+    buttonVariants({ intent: "primary", disabled: true } as any);
+    buttonVariants({ intent: "primary", size: "medium" } as any);
+    buttonVariants({
+      intent: "warning",
+      size: "medium",
+      disabled: true,
+    } as any);
+    buttonVariants({ size: "small" } as any);
+    buttonVariants({ size: "large", intent: "unset" } as any);
+  });
+
+  await benchmark.warmup();
+  await benchmark.run();
+  logResultsTable(benchmark);
+
+  process.exit();
+}
+
+run();