diff --git a/.gitignore b/.gitignore
index 1a4f4e272..a52a1ecbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
-/*.js.map
+/src/*.js.map
 /examples
 /test
 /scripts
 /node_modules/.cache
+/.nyc_output
+/coverage
diff --git a/action.yml b/action.yml
index 6553fbcfb..45efebd6a 100644
--- a/action.yml
+++ b/action.yml
@@ -55,7 +55,10 @@ inputs:
   external-data-json-path:
     description: 'JSON data file for storing benchmark results. When this input is set, github-action-benchmark no longer uses Git branch to store data. Instead, it reads and appends benchmark data from/to the file. User must store the file anywhere'
     required: false
+  max-items-in-chart:
+    description: 'Max data points in a benchmark chart to avoid making the chart too busy. Value must be unsigned integer. No limit by default'
+    required: false
 
 runs:
   using: 'node12'
-  main: 'index.js'
+  main: 'src/index.js'
diff --git a/node_modules/@types/node/README.md b/node_modules/@types/node/README.md
index d842f1f2b..2b406156f 100644
--- a/node_modules/@types/node/README.md
+++ b/node_modules/@types/node/README.md
@@ -8,9 +8,9 @@ This package contains type definitions for Node.js (http://nodejs.org/).
 Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/node.
 
 ### Additional Details
- * Last updated: Tue, 19 Nov 2019 19:44:54 GMT
+ * Last updated: Mon, 25 Nov 2019 22:58:16 GMT
  * Dependencies: none
  * Global values: `Buffer`, `NodeJS`, `Symbol`, `__dirname`, `__filename`, `clearImmediate`, `clearInterval`, `clearTimeout`, `console`, `exports`, `global`, `module`, `process`, `queueMicrotask`, `require`, `setImmediate`, `setInterval`, `setTimeout`
 
 # Credits
-These definitions were written by Microsoft TypeScript (https://github.com/Microsoft), DefinitelyTyped (https://github.com/DefinitelyTyped), Alberto Schiabel (https://github.com/jkomyno), Alexander T. (https://github.com/a-tarasyuk), Alvis HT Tang (https://github.com/alvis), Andrew Makarov (https://github.com/r3nya), Benjamin Toueg (https://github.com/btoueg), Bruno Scheufler (https://github.com/brunoscheufler), Chigozirim C. (https://github.com/smac89), Christian Vaagland Tellnes (https://github.com/tellnes), David Junger (https://github.com/touffy), Deividas Bakanas (https://github.com/DeividasBakanas), Eugene Y. Q. Shen (https://github.com/eyqs), Flarna (https://github.com/Flarna), Hannes Magnusson (https://github.com/Hannes-Magnusson-CK), Hoàng Văn Khải (https://github.com/KSXGitHub), Huw (https://github.com/hoo29), Kelvin Jin (https://github.com/kjin), Klaus Meinhardt (https://github.com/ajafff), Lishude (https://github.com/islishude), Mariusz Wiktorczyk (https://github.com/mwiktorczyk), Mohsen Azimi (https://github.com/mohsen1), Nicolas Even (https://github.com/n-e), Nicolas Voigt (https://github.com/octo-sniffle), Nikita Galkin (https://github.com/galkin), Parambir Singh (https://github.com/parambirs), Sebastian Silbermann (https://github.com/eps1lon), Simon Schick (https://github.com/SimonSchick), Thomas den Hollander (https://github.com/ThomasdenH), Wilco Bakker (https://github.com/WilcoBakker), wwwy3y3 (https://github.com/wwwy3y3), Zane Hannan AU (https://github.com/ZaneHannanAU), Samuel Ainsworth (https://github.com/samuela), Kyle Uehlein (https://github.com/kuehlein), Jordi Oliveras Rovira (https://github.com/j-oliveras), Thanik Bhongbhibhat (https://github.com/bhongy), Marcin Kopacz (https://github.com/chyzwar), Trivikram Kamat (https://github.com/trivikr), Minh Son Nguyen (https://github.com/nguymin4), and Junxiao Shi (https://github.com/yoursunny).
+These definitions were written by Microsoft TypeScript (https://github.com/Microsoft), DefinitelyTyped (https://github.com/DefinitelyTyped), Alberto Schiabel (https://github.com/jkomyno), Alexander T. (https://github.com/a-tarasyuk), Alvis HT Tang (https://github.com/alvis), Andrew Makarov (https://github.com/r3nya), Benjamin Toueg (https://github.com/btoueg), Bruno Scheufler (https://github.com/brunoscheufler), Chigozirim C. (https://github.com/smac89), Christian Vaagland Tellnes (https://github.com/tellnes), David Junger (https://github.com/touffy), Deividas Bakanas (https://github.com/DeividasBakanas), Eugene Y. Q. Shen (https://github.com/eyqs), Flarna (https://github.com/Flarna), Hannes Magnusson (https://github.com/Hannes-Magnusson-CK), Hoàng Văn Khải (https://github.com/KSXGitHub), Huw (https://github.com/hoo29), Kelvin Jin (https://github.com/kjin), Klaus Meinhardt (https://github.com/ajafff), Lishude (https://github.com/islishude), Mariusz Wiktorczyk (https://github.com/mwiktorczyk), Mohsen Azimi (https://github.com/mohsen1), Nicolas Even (https://github.com/n-e), Nicolas Voigt (https://github.com/octo-sniffle), Nikita Galkin (https://github.com/galkin), Parambir Singh (https://github.com/parambirs), Sebastian Silbermann (https://github.com/eps1lon), Simon Schick (https://github.com/SimonSchick), Thomas den Hollander (https://github.com/ThomasdenH), Wilco Bakker (https://github.com/WilcoBakker), wwwy3y3 (https://github.com/wwwy3y3), Zane Hannan AU (https://github.com/ZaneHannanAU), Samuel Ainsworth (https://github.com/samuela), Kyle Uehlein (https://github.com/kuehlein), Jordi Oliveras Rovira (https://github.com/j-oliveras), Thanik Bhongbhibhat (https://github.com/bhongy), Marcin Kopacz (https://github.com/chyzwar), Trivikram Kamat (https://github.com/trivikr), Minh Son Nguyen (https://github.com/nguymin4), Junxiao Shi (https://github.com/yoursunny), and Ilia Baryshnikov (https://github.com/qwelias).
diff --git a/node_modules/@types/node/child_process.d.ts b/node_modules/@types/node/child_process.d.ts
index c220e1966..09eeba3b4 100644
--- a/node_modules/@types/node/child_process.d.ts
+++ b/node_modules/@types/node/child_process.d.ts
@@ -18,7 +18,7 @@ declare module "child_process" {
         readonly killed: boolean;
         readonly pid: number;
         readonly connected: boolean;
-        kill(signal?: string): void;
+        kill(signal?: NodeJS.Signals | number): void;
         send(message: any, callback?: (error: Error | null) => void): boolean;
         send(message: any, sendHandle?: net.Socket | net.Server, callback?: (error: Error | null) => void): boolean;
         send(message: any, sendHandle?: net.Socket | net.Server, options?: MessageOptions, callback?: (error: Error | null) => void): boolean;
@@ -36,45 +36,45 @@ declare module "child_process" {
          */
 
         addListener(event: string, listener: (...args: any[]) => void): this;
-        addListener(event: "close", listener: (code: number, signal: string) => void): this;
+        addListener(event: "close", listener: (code: number, signal: NodeJS.Signals) => void): this;
         addListener(event: "disconnect", listener: () => void): this;
         addListener(event: "error", listener: (err: Error) => void): this;
-        addListener(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
+        addListener(event: "exit", listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
         addListener(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         emit(event: string | symbol, ...args: any[]): boolean;
-        emit(event: "close", code: number, signal: string): boolean;
+        emit(event: "close", code: number, signal: NodeJS.Signals): boolean;
         emit(event: "disconnect"): boolean;
         emit(event: "error", err: Error): boolean;
-        emit(event: "exit", code: number | null, signal: string | null): boolean;
+        emit(event: "exit", code: number | null, signal: NodeJS.Signals | null): boolean;
         emit(event: "message", message: any, sendHandle: net.Socket | net.Server): boolean;
 
         on(event: string, listener: (...args: any[]) => void): this;
-        on(event: "close", listener: (code: number, signal: string) => void): this;
+        on(event: "close", listener: (code: number, signal: NodeJS.Signals) => void): this;
         on(event: "disconnect", listener: () => void): this;
         on(event: "error", listener: (err: Error) => void): this;
-        on(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
+        on(event: "exit", listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
         on(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         once(event: string, listener: (...args: any[]) => void): this;
-        once(event: "close", listener: (code: number, signal: string) => void): this;
+        once(event: "close", listener: (code: number, signal: NodeJS.Signals) => void): this;
         once(event: "disconnect", listener: () => void): this;
         once(event: "error", listener: (err: Error) => void): this;
-        once(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
+        once(event: "exit", listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
         once(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         prependListener(event: string, listener: (...args: any[]) => void): this;
-        prependListener(event: "close", listener: (code: number, signal: string) => void): this;
+        prependListener(event: "close", listener: (code: number, signal: NodeJS.Signals) => void): this;
         prependListener(event: "disconnect", listener: () => void): this;
         prependListener(event: "error", listener: (err: Error) => void): this;
-        prependListener(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
+        prependListener(event: "exit", listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
         prependListener(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
 
         prependOnceListener(event: string, listener: (...args: any[]) => void): this;
-        prependOnceListener(event: "close", listener: (code: number, signal: string) => void): this;
+        prependOnceListener(event: "close", listener: (code: number, signal: NodeJS.Signals) => void): this;
         prependOnceListener(event: "disconnect", listener: () => void): this;
         prependOnceListener(event: "error", listener: (err: Error) => void): this;
-        prependOnceListener(event: "exit", listener: (code: number | null, signal: string | null) => void): this;
+        prependOnceListener(event: "exit", listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
         prependOnceListener(event: "message", listener: (message: any, sendHandle: net.Socket | net.Server) => void): this;
     }
 
@@ -244,7 +244,7 @@ declare module "child_process" {
     interface ExecOptions extends CommonOptions {
         shell?: string;
         maxBuffer?: number;
-        killSignal?: string;
+        killSignal?: NodeJS.Signals | number;
     }
 
     interface ExecOptionsWithStringEncoding extends ExecOptions {
@@ -259,7 +259,7 @@ declare module "child_process" {
         cmd?: string;
         killed?: boolean;
         code?: number;
-        signal?: string;
+        signal?: NodeJS.Signals;
     }
 
     // no `options` definitely means stdout/stderr are `string`.
@@ -300,7 +300,7 @@ declare module "child_process" {
 
     interface ExecFileOptions extends CommonOptions {
         maxBuffer?: number;
-        killSignal?: string;
+        killSignal?: NodeJS.Signals | number;
         windowsVerbatimArguments?: boolean;
         shell?: boolean | string;
     }
@@ -406,7 +406,7 @@ declare module "child_process" {
         argv0?: string; // Not specified in the docs
         input?: string | NodeJS.ArrayBufferView;
         stdio?: StdioOptions;
-        killSignal?: string | number;
+        killSignal?: NodeJS.Signals | number;
         maxBuffer?: number;
         encoding?: string;
         shell?: boolean | string;
@@ -424,7 +424,7 @@ declare module "child_process" {
         stdout: T;
         stderr: T;
         status: number | null;
-        signal: string | null;
+        signal: NodeJS.Signals | null;
         error?: Error;
     }
     function spawnSync(command: string): SpawnSyncReturns<Buffer>;
@@ -439,7 +439,7 @@ declare module "child_process" {
         input?: string | Uint8Array;
         stdio?: StdioOptions;
         shell?: string;
-        killSignal?: string | number;
+        killSignal?: NodeJS.Signals | number;
         maxBuffer?: number;
         encoding?: string;
     }
@@ -457,7 +457,7 @@ declare module "child_process" {
     interface ExecFileSyncOptions extends CommonOptions {
         input?: string | NodeJS.ArrayBufferView;
         stdio?: StdioOptions;
-        killSignal?: string | number;
+        killSignal?: NodeJS.Signals | number;
         maxBuffer?: number;
         encoding?: string;
         shell?: boolean | string;
diff --git a/node_modules/@types/node/crypto.d.ts b/node_modules/@types/node/crypto.d.ts
index ee0dd7f8b..b7ecb7fff 100644
--- a/node_modules/@types/node/crypto.d.ts
+++ b/node_modules/@types/node/crypto.d.ts
@@ -220,11 +220,11 @@ declare module "crypto" {
         setAAD(buffer: Buffer, options?: { plaintextLength: number }): this;
         getAuthTag(): Buffer;
     }
-    /** @deprecated since v10.0.0 use createCipheriv() */
+    /** @deprecated since v10.0.0 use createDecipheriv() */
     function createDecipher(algorithm: CipherCCMTypes, password: BinaryLike, options: CipherCCMOptions): DecipherCCM;
-    /** @deprecated since v10.0.0 use createCipheriv() */
+    /** @deprecated since v10.0.0 use createDecipheriv() */
     function createDecipher(algorithm: CipherGCMTypes, password: BinaryLike, options?: CipherGCMOptions): DecipherGCM;
-    /** @deprecated since v10.0.0 use createCipheriv() */
+    /** @deprecated since v10.0.0 use createDecipheriv() */
     function createDecipher(algorithm: string, password: BinaryLike, options?: stream.TransformOptions): Decipher;
 
     function createDecipheriv(
diff --git a/node_modules/@types/node/http.d.ts b/node_modules/@types/node/http.d.ts
index 65ea677de..139a9fb42 100644
--- a/node_modules/@types/node/http.d.ts
+++ b/node_modules/@types/node/http.d.ts
@@ -157,6 +157,7 @@ declare module "http" {
         writeContinue(callback?: () => void): void;
         writeHead(statusCode: number, reasonPhrase?: string, headers?: OutgoingHttpHeaders): this;
         writeHead(statusCode: number, headers?: OutgoingHttpHeaders): this;
+        writeProcessing(): void;
     }
 
     interface InformationEvent {
diff --git a/node_modules/@types/node/index.d.ts b/node_modules/@types/node/index.d.ts
index f4d3a9b9e..60f72c927 100644
--- a/node_modules/@types/node/index.d.ts
+++ b/node_modules/@types/node/index.d.ts
@@ -40,6 +40,7 @@
 //                 Trivikram Kamat <https://github.com/trivikr>
 //                 Minh Son Nguyen <https://github.com/nguymin4>
 //                 Junxiao Shi <https://github.com/yoursunny>
+//                 Ilia Baryshnikov <https://github.com/qwelias>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 // NOTE: These definitions support NodeJS and TypeScript 3.2.
diff --git a/node_modules/@types/node/package.json b/node_modules/@types/node/package.json
index 97e35585e..b52f1a367 100644
--- a/node_modules/@types/node/package.json
+++ b/node_modules/@types/node/package.json
@@ -1,26 +1,20 @@
 {
-  "_args": [
-    [
-      "@types/node@12.12.11",
-      "/Users/rhayasd/Develop/github.com/rhysd/github-action-benchmark"
-    ]
-  ],
-  "_from": "@types/node@12.12.11",
-  "_id": "@types/node@12.12.11",
+  "_from": "@types/node@^12.12.14",
+  "_id": "@types/node@12.12.14",
   "_inBundle": false,
-  "_integrity": "sha512-O+x6uIpa6oMNTkPuHDa9MhMMehlxLAd5QcOvKRjAFsBVpeFWTOPnXbDvILvFgFFZfQ1xh1EZi1FbXxUix+zpsQ==",
+  "_integrity": "sha512-u/SJDyXwuihpwjXy7hOOghagLEV1KdAST6syfnOk6QZAMzZuWZqXy5aYYZbh8Jdpd4escVFP0MvftHNDb9pruA==",
   "_location": "/@types/node",
   "_phantomChildren": {},
   "_requested": {
-    "type": "version",
+    "type": "range",
     "registry": true,
-    "raw": "@types/node@12.12.11",
+    "raw": "@types/node@^12.12.14",
     "name": "@types/node",
     "escapedName": "@types%2fnode",
     "scope": "@types",
-    "rawSpec": "12.12.11",
+    "rawSpec": "^12.12.14",
     "saveSpec": null,
-    "fetchSpec": "12.12.11"
+    "fetchSpec": "^12.12.14"
   },
   "_requiredBy": [
     "#DEV:/",
@@ -29,12 +23,14 @@
     "/@types/mock-require",
     "/cheerio/parse5"
   ],
-  "_resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.11.tgz",
-  "_spec": "12.12.11",
+  "_resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.14.tgz",
+  "_shasum": "1c1d6e3c75dba466e0326948d56e8bd72a1903d2",
+  "_spec": "@types/node@^12.12.14",
   "_where": "/Users/rhayasd/Develop/github.com/rhysd/github-action-benchmark",
   "bugs": {
     "url": "https://github.com/DefinitelyTyped/DefinitelyTyped/issues"
   },
+  "bundleDependencies": false,
   "contributors": [
     {
       "name": "Microsoft TypeScript",
@@ -195,9 +191,14 @@
     {
       "name": "Junxiao Shi",
       "url": "https://github.com/yoursunny"
+    },
+    {
+      "name": "Ilia Baryshnikov",
+      "url": "https://github.com/qwelias"
     }
   ],
   "dependencies": {},
+  "deprecated": false,
   "description": "TypeScript definitions for Node.js",
   "homepage": "https://github.com/DefinitelyTyped/DefinitelyTyped#readme",
   "license": "MIT",
@@ -211,7 +212,7 @@
   "scripts": {},
   "typeScriptVersion": "2.8",
   "types": "index.d.ts",
-  "typesPublisherContentHash": "db8a3e1fadc482615dd04e1c1d0d26eca954d792aed008eac14078e02f14e87b",
+  "typesPublisherContentHash": "305a8ff81632f0e70287898475e87d6aedbd683a5e37cb775f9ea845625cfa06",
   "typesVersions": {
     ">=3.2.0-0": {
       "*": [
@@ -219,5 +220,5 @@
       ]
     }
   },
-  "version": "12.12.11"
+  "version": "12.12.14"
 }
diff --git a/package-lock.json b/package-lock.json
index ced785e0a..ff935c780 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -37,6 +37,47 @@
         "@babel/highlight": "^7.0.0"
       }
     },
+    "@babel/generator": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.7.4.tgz",
+      "integrity": "sha512-m5qo2WgdOJeyYngKImbkyQrnUN1mPceaG5BV+G0E3gWsa4l/jCSryWJdM2x8OuGAOyh+3d5pVYfZWCiNFtynxg==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.7.4",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.7.4.tgz",
+      "integrity": "sha512-AnkGIdiBhEuiwdoMnKm7jfPfqItZhgRaZfMg1XX3bS25INOnLPjPG1Ppnajh8eqgt5kPJnfqrRHqFqmjKDZLzQ==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.7.4",
+        "@babel/template": "^7.7.4",
+        "@babel/types": "^7.7.4"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.7.4.tgz",
+      "integrity": "sha512-QTGKEdCkjgzgfJ3bAyRwF4yyT3pg+vDgan8DSivq1eS0gwi+KGKE5x8kRcbeFTb/673mkO5SN1IZfmCfA5o+EA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.7.4"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.7.4.tgz",
+      "integrity": "sha512-guAg1SXFcVr04Guk9eq0S4/rWS++sbmyqosJzVs8+1fH5NI+ZcmkaSkc7dmtAFbHFva6yRJnjW3yAcGxjueDug==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.7.4"
+      }
+    },
     "@babel/highlight": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
@@ -48,6 +89,62 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@babel/parser": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.7.4.tgz",
+      "integrity": "sha512-jIwvLO0zCL+O/LmEJQjWA75MQTWwx3c3u2JOTDK5D3/9egrWRRA0/0hk9XXywYnXZVVpzrBYeIQTmhwUaePI9g==",
+      "dev": true
+    },
+    "@babel/template": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.7.4.tgz",
+      "integrity": "sha512-qUzihgVPguAzXCK7WXw8pqs6cEwi54s3E+HrejlkuWO6ivMKx9hZl3Y2fSXp9i5HgyWmj7RKP+ulaYnKM4yYxw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.7.4",
+        "@babel/types": "^7.7.4"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.7.4.tgz",
+      "integrity": "sha512-P1L58hQyupn8+ezVA2z5KBm4/Zr4lCC8dwKCMYzsa5jFMDMQAzaBNy9W5VjB+KAmBjb40U7a/H6ao+Xo+9saIw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.7.4",
+        "@babel/helper-function-name": "^7.7.4",
+        "@babel/helper-split-export-declaration": "^7.7.4",
+        "@babel/parser": "^7.7.4",
+        "@babel/types": "^7.7.4",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.13"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
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+        "find-cache-dir": "^2.1.0",
+        "find-up": "^3.0.0",
+        "foreground-child": "^1.5.6",
+        "glob": "^7.1.3",
+        "istanbul-lib-coverage": "^2.0.5",
+        "istanbul-lib-hook": "^2.0.7",
+        "istanbul-lib-instrument": "^3.3.0",
+        "istanbul-lib-report": "^2.0.8",
+        "istanbul-lib-source-maps": "^3.0.6",
+        "istanbul-reports": "^2.2.4",
+        "js-yaml": "^3.13.1",
+        "make-dir": "^2.1.0",
+        "merge-source-map": "^1.1.0",
+        "resolve-from": "^4.0.0",
+        "rimraf": "^2.6.3",
+        "signal-exit": "^3.0.2",
+        "spawn-wrap": "^1.4.2",
+        "test-exclude": "^5.2.3",
+        "uuid": "^3.3.2",
+        "yargs": "^13.2.2",
+        "yargs-parser": "^13.0.0"
+      },
+      "dependencies": {
+        "resolve-from": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+          "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
+          "dev": true
+        },
+        "rimraf": {
+          "version": "2.7.1",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
+          "integrity": "sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.1.3"
+          }
+        }
+      }
+    },
     "object-inspect": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.6.0.tgz",
@@ -1864,6 +2462,16 @@
       "integrity": "sha512-pVOEP16TrAO2/fjej1IdOyupJY8KDUM1CvsaScRbw6oddvpQoOfGk4ywha0HKKVAD6RkW4x6Q+tNBwhf3Bgpuw==",
       "dev": true
     },
+    "optimist": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/optimist/-/optimist-0.6.1.tgz",
+      "integrity": "sha1-2j6nRob6IaGaERwybpDrFaAZZoY=",
+      "dev": true,
+      "requires": {
+        "minimist": "~0.0.1",
+        "wordwrap": "~0.0.2"
+      }
+    },
     "optionator": {
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
@@ -1878,6 +2486,12 @@
         "word-wrap": "~1.2.3"
       }
     },
+    "os-homedir": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
+      "integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
+      "dev": true
+    },
     "os-name": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/os-name/-/os-name-3.1.0.tgz",
@@ -1922,6 +2536,18 @@
       "integrity": "sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==",
       "dev": true
     },
+    "package-hash": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/package-hash/-/package-hash-3.0.0.tgz",
+      "integrity": "sha512-lOtmukMDVvtkL84rJHI7dpTYq+0rli8N2wlnqUcBuDWCfVhRUfOmnR9SsoHFMLpACvEV60dX7rd0rFaYDZI+FA==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.15",
+        "hasha": "^3.0.0",
+        "lodash.flattendeep": "^4.4.0",
+        "release-zalgo": "^1.0.0"
+      }
+    },
     "parent-module": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
@@ -2074,6 +2700,12 @@
       "integrity": "sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==",
       "dev": true
     },
+    "pseudomap": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/pseudomap/-/pseudomap-1.0.2.tgz",
+      "integrity": "sha1-8FKijacOYYkX7wqKw0wa5aaChrM=",
+      "dev": true
+    },
     "pump": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
@@ -2121,6 +2753,29 @@
         }
       }
     },
+    "read-pkg-up": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-4.0.0.tgz",
+      "integrity": "sha512-6etQSH7nJGsK0RbG/2TeDzZFa8shjQ1um+SwQQ5cwKy0dhSXdOncEhb1CPpvQG4h7FyOV6EB6YlV0yJvZQNAkA==",
+      "dev": true,
+      "requires": {
+        "find-up": "^3.0.0",
+        "read-pkg": "^3.0.0"
+      },
+      "dependencies": {
+        "read-pkg": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-3.0.0.tgz",
+          "integrity": "sha1-nLxoaXj+5l0WwA4rGcI3/Pbjg4k=",
+          "dev": true,
+          "requires": {
+            "load-json-file": "^4.0.0",
+            "normalize-package-data": "^2.3.2",
+            "path-type": "^3.0.0"
+          }
+        }
+      }
+    },
     "readable-stream": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
@@ -2142,11 +2797,20 @@
       }
     },
     "regexpp": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-2.0.1.tgz",
-      "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.0.0.tgz",
+      "integrity": "sha512-Z+hNr7RAVWxznLPuA7DIh8UNX1j9CDrUQxskw9IrBE1Dxue2lyXT+shqEIeLUjrokxIP8CMy1WkjgG3rTsd5/g==",
       "dev": true
     },
+    "release-zalgo": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/release-zalgo/-/release-zalgo-1.0.0.tgz",
+      "integrity": "sha1-CXALflB0Mpc5Mw5TXFqQ+2eFFzA=",
+      "dev": true,
+      "requires": {
+        "es6-error": "^4.0.1"
+      }
+    },
     "remove-trailing-separator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
@@ -2191,9 +2855,9 @@
       }
     },
     "rimraf": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
-      "integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.0.tgz",
+      "integrity": "sha512-NDGVxTsjqfunkds7CqsOiEnxln4Bo7Nddl3XhS4pXg5OzwkLqJ971ZVAAnB+DDLnF76N+VnDEiBHaVV8I06SUg==",
       "dev": true,
       "requires": {
         "glob": "^7.1.3"
@@ -2293,6 +2957,37 @@
         "is-fullwidth-code-point": "^2.0.0"
       }
     },
+    "source-map": {
+      "version": "0.5.7",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+      "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+      "dev": true
+    },
+    "spawn-wrap": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-1.4.3.tgz",
+      "integrity": "sha512-IgB8md0QW/+tWqcavuFgKYR/qIRvJkRLPJDFaoXtLLUaVcCDK0+HeFTkmQHj3eprcYhc+gOl0aEA1w7qZlYezw==",
+      "dev": true,
+      "requires": {
+        "foreground-child": "^1.5.6",
+        "mkdirp": "^0.5.0",
+        "os-homedir": "^1.0.1",
+        "rimraf": "^2.6.2",
+        "signal-exit": "^3.0.2",
+        "which": "^1.3.0"
+      },
+      "dependencies": {
+        "rimraf": {
+          "version": "2.7.1",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
+          "integrity": "sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.1.3"
+          }
+        }
+      }
+    },
     "spdx-correct": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
@@ -2456,6 +3151,18 @@
         }
       }
     },
+    "test-exclude": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
+      "integrity": "sha512-M+oxtseCFO3EDtAaGH7iiej3CBkzXqFMbzqYAACdzKui4eZA+pq3tZEwChvOdNfa7xxy8BfbmgJSIr43cC/+2g==",
+      "dev": true,
+      "requires": {
+        "glob": "^7.1.3",
+        "minimatch": "^3.0.4",
+        "read-pkg-up": "^4.0.0",
+        "require-main-filename": "^2.0.0"
+      }
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -2477,6 +3184,12 @@
         "os-tmpdir": "~1.0.2"
       }
     },
+    "to-fast-properties": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+      "dev": true
+    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
@@ -2513,6 +3226,32 @@
       "integrity": "sha512-ml7V7JfiN2Xwvcer+XAf2csGO1bPBdRbFCkYBczNZggrBZ9c7G3riSUeJmqEU5uOtXNPMhE3n+R4FA/3YOAWOQ==",
       "dev": true
     },
+    "uc.micro": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-1.0.6.tgz",
+      "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA==",
+      "dev": true
+    },
+    "uglify-js": {
+      "version": "3.6.9",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.9.tgz",
+      "integrity": "sha512-pcnnhaoG6RtrvHJ1dFncAe8Od6Nuy30oaJ82ts6//sGSXOP5UjBMEthiProjXmMNHOfd93sqlkztifFMcb+4yw==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "commander": "~2.20.3",
+        "source-map": "~0.6.1"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
     "universal-user-agent": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-2.1.0.tgz",
@@ -2536,6 +3275,12 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "uuid": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
+      "dev": true
+    },
     "v8-compile-cache": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
@@ -2589,6 +3334,12 @@
       "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
       "dev": true
     },
+    "wordwrap": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
@@ -2642,12 +3393,29 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.3.tgz",
+      "integrity": "sha512-GaETH5wwsX+GcnzhPgKcKjJ6M2Cq3/iZp1WyY/X1CSqrW+jVNM9Y7D8EC2sM4ZG/V8wZlSniJnCKWPmBYAucRQ==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
     "yargs": {
       "version": "13.3.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
diff --git a/package.json b/package.json
index 2e3f94076..ddf453fce 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "private": true,
   "description": "",
-  "main": "index.js",
+  "main": "src/index.js",
   "scripts": {
     "build": "tsc -p .",
     "watch:tsc": "tsc -p . --watch --preserveWatchOutput",
@@ -11,7 +11,9 @@
     "watch": "npm-run-all -p watch:tsc watch:mocha",
     "lint": "eslint '**/*.ts'",
     "fix": "eslint --fix '**/*.ts'",
-    "test": "mocha ./test"
+    "test": "mocha ./test",
+    "coverage": "nyc --reporter=lcov --reporter=text npm test",
+    "cov": "nyc --reporter=lcov --reporter=text-summary npm test && open ./coverage/lcov-report/index.html"
   },
   "repository": {
     "type": "git",
@@ -40,29 +42,40 @@
     "@types/cheerio": "^0.22.14",
     "@types/deep-diff": "^1.0.0",
     "@types/deep-equal": "^1.0.1",
+    "@types/markdown-it": "0.0.9",
     "@types/mocha": "^5.2.7",
     "@types/mock-require": "^2.0.0",
-    "@types/node": "^12.12.11",
-    "@typescript-eslint/eslint-plugin": "^2.8.0",
-    "@typescript-eslint/parser": "^2.8.0",
+    "@types/node": "^12.12.14",
+    "@types/rimraf": "^2.0.3",
+    "@typescript-eslint/eslint-plugin": "^2.9.0",
+    "@typescript-eslint/parser": "^2.9.0",
     "acorn": "^7.1.0",
     "cheerio": "^1.0.0-rc.3",
     "deep-diff": "^1.0.2",
     "deep-equal": "^1.1.1",
-    "eslint": "^6.6.0",
+    "eslint": "^6.7.1",
     "eslint-config-prettier": "^6.7.0",
-    "eslint-plugin-mocha": "^6.2.1",
+    "eslint-plugin-mocha": "^6.2.2",
     "eslint-plugin-prettier": "^3.1.1",
     "husky": "^3.1.0",
+    "markdown-it": "^10.0.0",
     "mocha": "^6.2.2",
     "mock-require": "^3.0.3",
     "npm-run-all": "^4.1.5",
+    "nyc": "^14.1.1",
     "prettier": "^1.19.1",
+    "rimraf": "^3.0.0",
     "typescript": "^3.7.2"
   },
   "husky": {
     "hooks": {
       "pre-push": "npm-run-all lint build test"
     }
+  },
+  "nyc": {
+    "extends": "@istanbuljs/nyc-config-typescript",
+    "extension": [
+      ".ts"
+    ]
   }
 }
diff --git a/config.js b/src/config.js
similarity index 87%
rename from config.js
rename to src/config.js
index 037543645..87be3ba49 100644
--- a/config.js
+++ b/src/config.js
@@ -11,7 +11,8 @@ const core = __importStar(require("@actions/core"));
 const fs_1 = require("fs");
 const os = __importStar(require("os"));
 const path = __importStar(require("path"));
-exports.VALID_TOOLS = ['cargo', 'go', 'benchmarkjs', 'pytest'];
+exports.VALID_TOOLS = ['cargo', 'go', 'benchmarkjs', 'pytest', 'googlecpp'];
+const RE_UINT = /^\d+$/;
 function validateToolType(tool) {
     if (exports.VALID_TOOLS.includes(tool)) {
         return;
@@ -136,6 +137,25 @@ async function validateExternalDataJsonPath(path, autoPush) {
         throw new Error(`Invalid value for 'external-data-json-path' input: ${err}`);
     }
 }
+function getUintInput(name) {
+    const input = core.getInput(name);
+    if (!input) {
+        return null;
+    }
+    if (!RE_UINT.test(input)) {
+        throw new Error(`'${name}' input must be unsigned integer but got '${input}'`);
+    }
+    const i = parseInt(input, 10);
+    if (isNaN(i)) {
+        throw new Error(`Unsigned integer value '${input}' in '${name}' input was parsed as NaN`);
+    }
+    return i;
+}
+function validateMaxItemsInChart(max) {
+    if (max !== null && max <= 0) {
+        throw new Error(`'max-items-in-chart' input value must be one or more but got ${max}`);
+    }
+}
 async function configFromJobInput() {
     const tool = core.getInput('tool');
     let outputFilePath = core.getInput('output-file-path');
@@ -150,6 +170,7 @@ async function configFromJobInput() {
     const failOnAlert = getBoolInput('fail-on-alert');
     const alertCommentCcUsers = getCommaSeparatedInput('alert-comment-cc-users');
     let externalDataJsonPath = core.getInput('external-data-json-path');
+    const maxItemsInChart = getUintInput('max-items-in-chart');
     validateToolType(tool);
     outputFilePath = await validateOutputFilePath(outputFilePath);
     validateGhPagesBranch(ghPagesBranch);
@@ -163,6 +184,7 @@ async function configFromJobInput() {
     }
     validateAlertCommentCcUsers(alertCommentCcUsers);
     externalDataJsonPath = await validateExternalDataJsonPath(externalDataJsonPath, autoPush);
+    validateMaxItemsInChart(maxItemsInChart);
     return {
         name,
         tool,
@@ -177,6 +199,7 @@ async function configFromJobInput() {
         failOnAlert,
         alertCommentCcUsers,
         externalDataJsonPath,
+        maxItemsInChart,
     };
 }
 exports.configFromJobInput = configFromJobInput;
diff --git a/default_index_html.js b/src/default_index_html.js
similarity index 97%
rename from default_index_html.js
rename to src/default_index_html.js
index a2074f1f6..9e0f30c5b 100644
--- a/default_index_html.js
+++ b/src/default_index_html.js
@@ -103,7 +103,9 @@ exports.DEFAULT_INDEX_HTML = String.raw `<!DOCTYPE html>
           cargo: '#dea584',
           go: '#00add8',
           benchmarkjs: '#f1e05a',
-          pytest: '#3572a5'
+          pytest: '#3572a5',
+          googlecpp: '#f34b7d',
+          _: '#333333'
         };
 
         const data = window.BENCHMARK_DATA;
@@ -116,8 +118,7 @@ exports.DEFAULT_INDEX_HTML = String.raw `<!DOCTYPE html>
           const map = new Map();
           for (const entry of entries) {
             const {commit, date, tool, benches} = entry;
-            // Reverse array because of descending order by time
-            for (const bench of benches.reverse()) {
+            for (const bench of benches) {
               const result = { commit, date, tool, bench };
               const arr = map.get(bench.name);
               if (arr === undefined) {
@@ -135,7 +136,7 @@ exports.DEFAULT_INDEX_HTML = String.raw `<!DOCTYPE html>
           canvas.className = 'benchmark-chart';
           parent.appendChild(canvas);
 
-          const color = toolColors[dataset.length > 0 ? dataset[0].tool : ''];
+          const color = toolColors[dataset.length > 0 ? dataset[0].tool : '_'];
           const data = {
             labels: dataset.map(d => d.commit.id.slice(0, 7)),
             datasets: [
diff --git a/extract.js b/src/extract.js
similarity index 88%
rename from extract.js
rename to src/extract.js
index 2399a7368..c6793878f 100644
--- a/extract.js
+++ b/src/extract.js
@@ -115,6 +115,22 @@ function extractPytestResult(output) {
         throw new Error(`Output file for 'pytest' must be JSON file generated by --benchmark-json option: ${err.message}`);
     }
 }
+function extractGoogleCppResult(output) {
+    let json;
+    try {
+        json = JSON.parse(output);
+    }
+    catch (err) {
+        throw new Error(`Output file for 'googlecpp' must be JSON file generated by --benchmark_format=json option: ${err.message}`);
+    }
+    return json.benchmarks.map(b => {
+        const name = b.name;
+        const value = b.real_time;
+        const unit = b.time_unit + '/iter';
+        const extra = `iterations: ${b.iterations}\ncpu: ${b.cpu_time} ${b.time_unit}\nthreads: ${b.threads}`;
+        return { name, value, unit, extra };
+    });
+}
 async function extractResult(config) {
     const output = await fs_1.promises.readFile(config.outputFilePath, 'utf8');
     const { tool } = config;
@@ -132,6 +148,9 @@ async function extractResult(config) {
         case 'pytest':
             benches = extractPytestResult(output);
             break;
+        case 'googlecpp':
+            benches = extractGoogleCppResult(output);
+            break;
         default:
             throw new Error(`FATAL: Unexpected tool: '${tool}'`);
     }
diff --git a/git.js b/src/git.js
similarity index 100%
rename from git.js
rename to src/git.js
diff --git a/index.js b/src/index.js
similarity index 100%
rename from index.js
rename to src/index.js
diff --git a/write.js b/src/write.js
similarity index 84%
rename from write.js
rename to src/write.js
index 16a981567..211719391 100644
--- a/write.js
+++ b/src/write.js
@@ -80,18 +80,20 @@ function biggerIsBetter(tool) {
             return true;
         case 'pytest':
             return true;
+        case 'googlecpp':
+            return false;
     }
 }
-function findAlerts(curEntry, prevEntry, threshold) {
-    core.debug(`Comparing current:${curEntry.commit.id} and prev:${prevEntry.commit.id} for alert`);
+function findAlerts(curSuite, prevSuite, threshold) {
+    core.debug(`Comparing current:${curSuite.commit.id} and prev:${prevSuite.commit.id} for alert`);
     const alerts = [];
-    for (const current of curEntry.benches) {
-        const prev = prevEntry.benches.find(b => b.name === current.name);
+    for (const current of curSuite.benches) {
+        const prev = prevSuite.benches.find(b => b.name === current.name);
         if (prev === undefined) {
             core.debug(`Skipped because benchmark '${current.name}' is not found in previous benchmarks`);
             continue;
         }
-        const ratio = biggerIsBetter(curEntry.tool)
+        const ratio = biggerIsBetter(curSuite.tool)
             ? prev.value / current.value // e.g. current=100, prev=200
             : current.value / prev.value; // e.g. current=200, prev=100
         if (ratio > threshold) {
@@ -108,7 +110,8 @@ function getCurrentRepo() {
     }
     return repo;
 }
-function buildAlertComment(alerts, benchName, curEntry, prevEntry, threshold, cc) {
+function buildAlertComment(alerts, benchName, curSuite, prevSuite, threshold, cc) {
+    var _a;
     // Do not show benchmark name if it is the default value 'Benchmark'.
     const benchmarkText = benchName === 'Benchmark' ? '' : ` **'${benchName}'**`;
     const title = threshold === 0 ? '# Performance Report' : '# :warning: **Performance Alert** :warning:';
@@ -118,7 +121,7 @@ function buildAlertComment(alerts, benchName, curEntry, prevEntry, threshold, cc
         `Possible performance regression was detected for benchmark${benchmarkText}.`,
         `Benchmark result of this commit is worse than the previous benchmark result exceeding threshold \`${threshold}\`.`,
         '',
-        `| Benchmark suite | Current: ${curEntry.commit.id} | Previous: ${prevEntry.commit.id} | Ratio |`,
+        `| Benchmark suite | Current: ${curSuite.commit.id} | Previous: ${prevSuite.commit.id} | Ratio |`,
         '|-|-|-|-|',
     ];
     function strOfValue(b) {
@@ -135,21 +138,22 @@ function buildAlertComment(alerts, benchName, curEntry, prevEntry, threshold, cc
     }
     const repo = getCurrentRepo();
     // eslint-disable-next-line @typescript-eslint/camelcase
-    const repoUrl = repo.html_url;
+    const repoUrl = (_a = repo.html_url, (_a !== null && _a !== void 0 ? _a : ''));
     const actionUrl = repoUrl + '/actions?query=workflow%3A' + encodeURIComponent(github.context.workflow);
     core.debug(`Action URL: ${actionUrl}`);
     // Footer
-    lines.push('', `This comment was automatically generated by [workflow](${actionUrl}) using [github-action-benchmark](https://github.com/rhysd/github-action-benchmark).`);
+    lines.push('', `This comment was automatically generated by [workflow](${actionUrl}) using [github-action-benchmark](https://github.com/marketplace/actions/continuous-benchmark).`);
     if (cc.length > 0) {
         lines.push('', `CC: ${cc.join(' ')}`);
     }
     return lines.join('\n');
 }
 async function leaveComment(commitId, body, token) {
+    var _a;
     core.debug('Sending alert comment:\n' + body);
     const repo = getCurrentRepo();
     // eslint-disable-next-line @typescript-eslint/camelcase
-    const repoUrl = repo.html_url;
+    const repoUrl = (_a = repo.html_url, (_a !== null && _a !== void 0 ? _a : ''));
     const client = new Octokit({ auth: token });
     const res = await client.repos.createCommitComment({
         owner: repo.owner.login,
@@ -162,25 +166,25 @@ async function leaveComment(commitId, body, token) {
     console.log(`Alert comment was sent to ${commitUrl}. Response:`, res.status, res.data);
     return res;
 }
-async function handleAlert(benchName, curEntry, prevEntry, config) {
+async function handleAlert(benchName, curSuite, prevSuite, config) {
     const { alertThreshold, githubToken, commentOnAlert, failOnAlert, alertCommentCcUsers } = config;
     if (!commentOnAlert && !failOnAlert) {
         core.debug('Alert check was skipped because both comment-on-alert and fail-on-alert were disabled');
         return;
     }
-    const alerts = findAlerts(curEntry, prevEntry, alertThreshold);
+    const alerts = findAlerts(curSuite, prevSuite, alertThreshold);
     if (alerts.length === 0) {
         core.debug('No performance alert found happily');
         return;
     }
     core.debug(`Found ${alerts.length} alerts`);
-    const body = buildAlertComment(alerts, benchName, curEntry, prevEntry, alertThreshold, alertCommentCcUsers);
+    const body = buildAlertComment(alerts, benchName, curSuite, prevSuite, alertThreshold, alertCommentCcUsers);
     let message = body;
     if (commentOnAlert) {
         if (!githubToken) {
-            throw new Error("'comment-on-alert' is set but github-token is not set");
+            throw new Error("'comment-on-alert' input is set but 'github-token' input is not set");
         }
-        const res = await leaveComment(curEntry.commit.id, body, githubToken);
+        const res = await leaveComment(curSuite.commit.id, body, githubToken);
         // eslint-disable-next-line @typescript-eslint/camelcase
         const url = res.data.html_url;
         message = body + `\nComment was generated at ${url}`;
@@ -190,7 +194,7 @@ async function handleAlert(benchName, curEntry, prevEntry, config) {
         throw new Error(message);
     }
 }
-function addBenchmarkToDataJson(benchName, bench, data) {
+function addBenchmarkToDataJson(benchName, bench, data, maxItems) {
     var _a, _b;
     // eslint-disable-next-line @typescript-eslint/camelcase
     const htmlUrl = (_b = (_a = github.context.payload.repository) === null || _a === void 0 ? void 0 : _a.html_url, (_b !== null && _b !== void 0 ? _b : ''));
@@ -200,24 +204,28 @@ function addBenchmarkToDataJson(benchName, bench, data) {
     // Add benchmark result
     if (data.entries[benchName] === undefined) {
         data.entries[benchName] = [bench];
-        core.debug(`No entry was found for benchmark '${benchName}' in existing data. Created`);
+        core.debug(`No suite was found for benchmark '${benchName}' in existing data. Created`);
     }
     else {
-        const entries = data.entries[benchName];
-        // Get last entry which has different commit ID for alert comment
-        for (const e of entries.slice().reverse()) {
+        const suites = data.entries[benchName];
+        // Get last suite which has different commit ID for alert comment
+        for (const e of suites.slice().reverse()) {
             if (e.commit.id !== bench.commit.id) {
                 prevBench = e;
                 break;
             }
         }
-        entries.push(bench);
+        suites.push(bench);
+        if (maxItems !== null && suites.length > maxItems) {
+            suites.splice(0, suites.length - maxItems);
+            core.debug(`Number of data items for '${benchName}' was truncated to ${maxItems} due to max-items-in-charts`);
+        }
     }
     return prevBench;
 }
 async function writeBenchmarkToGitHubPages(bench, config) {
     var _a, _b;
-    const { name, tool, ghPagesBranch, benchmarkDataDirPath, githubToken, autoPush, skipFetchGhPages } = config;
+    const { name, tool, ghPagesBranch, benchmarkDataDirPath, githubToken, autoPush, skipFetchGhPages, maxItemsInChart, } = config;
     const dataPath = path.join(benchmarkDataDirPath, 'data.js');
     const isPrivateRepo = (_b = (_a = github.context.payload.repository) === null || _a === void 0 ? void 0 : _a.private, (_b !== null && _b !== void 0 ? _b : false));
     await git.cmd('switch', ghPagesBranch);
@@ -231,7 +239,7 @@ async function writeBenchmarkToGitHubPages(bench, config) {
         }
         await io.mkdirP(benchmarkDataDirPath);
         const data = await loadDataJs(dataPath);
-        const prevBench = addBenchmarkToDataJson(name, bench, data);
+        const prevBench = addBenchmarkToDataJson(name, bench, data, maxItemsInChart);
         await storeDataJs(dataPath, data);
         await git.cmd('add', dataPath);
         await addIndexHtmlIfNeeded(benchmarkDataDirPath);
@@ -263,9 +271,9 @@ async function loadDataJson(jsonPath) {
     }
 }
 async function writeBenchmarkToExternalJson(bench, jsonFilePath, config) {
-    const { name } = config;
+    const { name, maxItemsInChart } = config;
     const data = await loadDataJson(jsonFilePath);
-    const prevBench = addBenchmarkToDataJson(name, bench, data);
+    const prevBench = addBenchmarkToDataJson(name, bench, data, maxItemsInChart);
     try {
         const jsonDirPath = path.dirname(jsonFilePath);
         await io.mkdirP(jsonDirPath);