add benchmarks for JTD serializers to compare with JSON.stringify

Author: epoberezkin

benchmark/package.json

@@ -0,0 +1,6 @@
+{
+  "private": true,
+  "devDependencies": {
+    "benchmark": "^2.1.4"
+  }
+}

benchmark/serialize.js

@@ -0,0 +1,73 @@
+/* eslint-disable no-console */
+const Ajv = require("ajv/dist/jtd").default
+const Benchmark = require('benchmark')
+const jtdValidationTests = require("../spec/json-typedef-spec/tests/validation.json")
+
+const ajv = new Ajv
+const suite = new Benchmark.Suite
+const tests = []
+
+for (const testName in jtdValidationTests) {
+  const {schema, instance, errors} = jtdValidationTests[testName]
+  const valid = errors.length === 0
+  if (!valid) continue
+  tests.push({
+    serialize: ajv.compileSerializer(schema),
+    data: instance
+  })
+}
+
+suite.add("JTD test suite: compiled JTD serializers", () => {
+  for (const test of tests) {
+    test.serialize(test.data)
+  }
+})
+
+suite.add("JTD test suite: JSON.stringify", () => {
+  for (const test of tests) {
+    JSON.stringify(test.data)
+  }
+})
+
+const testSchema = {
+  definitions: {
+    obj: {
+      properties: {
+        foo: {type: "string"},
+        bar: {type: "int8"}
+      }
+    }
+  },
+  properties: {
+    a: {ref: "obj"}
+  },
+  optionalProperties: {
+    b: {ref: "obj"}
+  }
+}
+
+const testData = {
+  a: {
+    foo: "foo1",
+    bar: 1
+  },
+  b: {
+    foo: "foo2",
+    bar: 2
+  }
+}
+
+const serializer = ajv.compileSerializer(testSchema)
+
+suite.add("test data: compiled JTD serializer", () => serializer(testData))
+suite.add("test data: JSON.stringify", () => JSON.stringify(testData))
+
+console.log()
+
+suite
+  .on("cycle", (event) => console.log(String(event.target)))
+  .on("complete", function () {
+    // eslint-disable-next-line no-invalid-this
+    console.log('The fastest is "' + this.filter('fastest').map('name') + '"');
+  })
+  .run({async: true})

package.json

@@ -27,7 +27,8 @@
     "test-all": "npm run test-cov && if-node-version 12 npm run test-browser",
     "test": "npm link && npm link ajv && npm run json-tests && npm run eslint && npm run test-cov",
     "test-ci": "AJV_FULL_TEST=true npm test",
-    "prepublish": "npm run build"
+    "prepublish": "npm run build",
+    "benchmark": "npm i && npm run build && npm link && cd ./benchmark && npm link ajv && npm i && node ./serialize"
   },
   "nyc": {
     "exclude": [