diff --git a/demo/package.json b/demo/package.json
index 30c195c..d4b8d5c 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -16,7 +16,7 @@
     "@types/react": "^18.0.27",
     "@types/react-dom": "^18.0.10",
     "antd": "^5.1.7",
-    "mahjong-utils": "^0.3.0",
+    "mahjong-utils": "^0.6.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-scripts": "5.0.1",
diff --git a/demo/yarn.lock b/demo/yarn.lock
index 6512913..e74df96 100644
--- a/demo/yarn.lock
+++ b/demo/yarn.lock
@@ -4902,6 +4902,11 @@ form-data@^3.0.0:
     combined-stream "^1.0.8"
     mime-types "^2.1.12"
 
+format-util@^1.0.5:
+  version "1.0.5"
+  resolved "http://localhost:4873/format-util/-/format-util-1.0.5.tgz#1ffb450c8a03e7bccffe40643180918cc297d271"
+  integrity sha512-varLbTj0e0yVyRpqQhuWV+8hlePAgaoFRhNFj50BNjEIrw1/DphHSObtqwskVCPWNgzwPoQrZAbfa/SBiicNeg==
+
 forwarded@0.2.0:
   version "0.2.0"
   resolved "https://registry.npmmirror.com/forwarded/-/forwarded-0.2.0.tgz#2269936428aad4c15c7ebe9779a84bf0b2a81811"
@@ -6562,17 +6567,19 @@ magic-string@^0.25.0, magic-string@^0.25.7:
   dependencies:
     sourcemap-codec "^1.4.8"
 
-mahjong-utils-entry@^0.2.5:
-  version "0.2.5"
-  resolved "http://localhost:4873/mahjong-utils-entry/-/mahjong-utils-entry-0.2.5.tgz#3a87b2fad2c20902c6466bc9bd8449193131b682"
-  integrity sha512-VNBlqDhjQtl8dogIxviCM3HwhlRrUmqNI1mfPDXkwtn/D4r/YNGwlVHXpFaZCpSpV+FtZ8VQQmdUgGIo+1HYMw==
+mahjong-utils-entry@^0.6.0:
+  version "0.6.0"
+  resolved "http://localhost:4873/mahjong-utils-entry/-/mahjong-utils-entry-0.6.0.tgz#29fe1a9e6191f10d181157a6e829953b7bb69b7f"
+  integrity sha512-V5u9mUkkc6C96PRR9FesxOrvN4DiUmWAywNy9JhBVh7gxW2HsRIVpNDw7767qdodId2/Y0cvNO6ktw2S4fmB0A==
+  dependencies:
+    format-util "^1.0.5"
 
-mahjong-utils@^0.3.0:
-  version "0.3.0"
-  resolved "http://localhost:4873/mahjong-utils/-/mahjong-utils-0.3.0.tgz#501643a22c31cfb27d1dd1d70d2bc63d6f0256fe"
-  integrity sha512-tBKBz2rMiiTSJbkKfiwITB58S9gXkFKOgTfxum046hILBfeDnK1P+2uBK3Z3eG4G6YWyQLfgAqxycU5JVGKpKw==
+mahjong-utils@^0.6.0:
+  version "0.6.0"
+  resolved "http://localhost:4873/mahjong-utils/-/mahjong-utils-0.6.0.tgz#ed0747754d68889865d5a09ccb1bda3677b9c0f9"
+  integrity sha512-IuIRErrCYRkNQhu7TiRGuNfzDZSVa43ScGsq+aNX+7MIk85rTBisNmIgEx9H63HEopcLmwgz5+6xRr5pCqelAA==
   dependencies:
-    mahjong-utils-entry "^0.2.5"
+    mahjong-utils-entry "^0.6.0"
 
 make-dir@^3.0.0, make-dir@^3.0.2, make-dir@^3.1.0:
   version "3.1.0"
diff --git a/package.json b/package.json
index 60a552f..9dc7137 100644
--- a/package.json
+++ b/package.json
@@ -4,12 +4,12 @@
     "name": "ssttkkl",
     "email": "huang.wen.long@hotmail.com"
   },
-  "version": "0.4.0",
+  "version": "0.5.2",
   "license": "MIT",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "scripts": {
-    "build": "tsc",
+    "build": "rimraf ./dist && tsc",
     "test": "jest",
     "lint": "eslint src/**/*.ts --fix"
   },
@@ -22,6 +22,7 @@
     "eslint-plugin-n": "^15.0.0",
     "eslint-plugin-promise": "^6.0.0",
     "jest": "^29.4.1",
+    "rimraf": "^5.0.1",
     "ts-jest": "^29.0.5",
     "ts-loader": "^9.4.2",
     "typescript": "*"
@@ -30,6 +31,6 @@
     "dist/**/*"
   ],
   "dependencies": {
-    "mahjong-utils-entry": "^0.4.0"
+    "mahjong-utils-entry": "^0.5.2"
   }
 }
diff --git a/src/coder/hora/hora.ts b/src/coder/hora/hora.ts
index dfdd6cb..fe717c8 100644
--- a/src/coder/hora/hora.ts
+++ b/src/coder/hora/hora.ts
@@ -1,14 +1,14 @@
 import { type AbstractHoraHandPattern, type Hora } from 'hora'
 import { decodeHoraHandPattern } from './hora-hand-pattern'
 
-export function decodeHora<T extends AbstractHoraHandPattern['type']>(
+export function decodeHora<T extends AbstractHoraHandPattern['type']> (
   raw: any,
   patternType: T
 ): Hora<AbstractHoraHandPattern & { type: T }>
 
-export function decodeHora(raw: any): Hora
+export function decodeHora (raw: any): Hora
 
-export function decodeHora(
+export function decodeHora (
   raw: any,
   patternType?: AbstractHoraHandPattern['type']
 ): Hora {
diff --git a/src/coder/shanten/shanten-info.ts b/src/coder/shanten/shanten-info.ts
index d66cda3..eaf86ba 100644
--- a/src/coder/shanten/shanten-info.ts
+++ b/src/coder/shanten/shanten-info.ts
@@ -1,5 +1,6 @@
 import { type Decoder, type Encoder } from '../../models/types'
 import {
+  type Improvement,
   type AbstractCommonShantenInfo,
   type AbstractShantenInfo,
   type ShantenWithFuroChance,
@@ -11,13 +12,43 @@ import { InvalidTypeException } from '../errors'
 import { decodeTatsu, encodeTatsu } from '../models/tatsu'
 import { decodeTile, encodeTile } from '../models/tile'
 
+export const decodeImprovement: Decoder<Improvement> = (raw) => {
+  return {
+    discard: decodeTile(raw.discard),
+    advance: raw.advance.map(decodeTile),
+    advanceNum: raw.advanceNum
+  }
+}
+
+export const encodeImprovement: Encoder<Improvement> = (data) => {
+  return {
+    discard: encodeTile(data.discard),
+    advance: data.advance.map(encodeTile),
+    advanceNum: data.advanceNum
+  }
+}
+
 export const decodeShantenWithoutGot: Decoder<ShantenWithoutGot> = (raw) => {
   return {
     shantenNum: raw.shantenNum,
     advance: raw.advance.map(decodeTile),
-    advanceNum: raw.advanceNum ?? undefined,
-    goodShapeAdvance: raw.goodShapeAdvance?.map(decodeTile),
-    goodShapeAdvanceNum: raw.goodShapeAdvanceNum ?? undefined
+    advanceNum: raw.advanceNum,
+    goodShapeAdvance: raw.goodShapeAdvance?.map(decodeTile) ?? null,
+    goodShapeAdvanceNum: raw.goodShapeAdvanceNum,
+    improvement: raw.improvement !== null
+      ? objToMap(raw.improvement, {
+        keyMapper: decodeTile,
+        valueMapper: (rawImprovementArray) => rawImprovementArray.map(decodeImprovement)
+      })
+      : null,
+    improvementNum: raw.improvementNum,
+    goodShapeImprovement: raw.goodShapeImprovement !== null
+      ? objToMap(raw.goodShapeImprovement, {
+        keyMapper: decodeTile,
+        valueMapper: (rawImprovementArray) => rawImprovementArray.map(decodeImprovement)
+      })
+      : null,
+    goodShapeImprovementNum: raw.goodShapeImprovementNum
   }
 }
 
@@ -25,9 +56,23 @@ export const encodeShantenWithoutGot: Encoder<ShantenWithoutGot> = (data) => {
   return {
     shantenNum: data.shantenNum,
     advance: data.advance.map(encodeTile),
-    advanceNum: data.advanceNum ?? null,
-    goodShapeAdvance: data.goodShapeAdvance?.map(encodeTile) ?? null,
-    goodShapeAdvanceNum: data.goodShapeAdvanceNum ?? null
+    advanceNum: data.advanceNum,
+    goodShapeAdvance: data.goodShapeAdvance?.map(encodeTile),
+    goodShapeAdvanceNum: data.goodShapeAdvanceNum,
+    improvement: data.improvement !== null
+      ? mapToObj(data.improvement, {
+        keyMapper: encodeTile,
+        valueMapper: (improvementArray) => improvementArray.map(encodeImprovement)
+      })
+      : null,
+    improvementNum: data.improvementNum,
+    goodShapeImprovement: data.goodShapeImprovement !== null
+      ? mapToObj(data.goodShapeImprovement, {
+        keyMapper: encodeTile,
+        valueMapper: (improvementArray) => improvementArray.map(encodeImprovement)
+      })
+      : null,
+    goodShapeImprovementNum: data.goodShapeImprovementNum
   }
 }
 
@@ -94,20 +139,20 @@ export const encodeCommonShantenInfo: Encoder<AbstractCommonShantenInfo> = (data
 export const decodeShantenWithFuroChance: Decoder<ShantenWithFuroChance> = (raw) => {
   return {
     shantenNum: raw.shantenNum,
-    pass: raw.pass !== null ? decodeShantenWithoutGot(raw.pass) : undefined,
+    pass: raw.pass !== null ? decodeShantenWithoutGot(raw.pass) : null,
     chi: Object.entries(raw.chi).map(([key, value]) => [decodeTatsu(key), decodeShantenWithGot(value)]),
-    pon: raw.pon !== null ? decodeShantenWithGot(raw.pon) : undefined,
-    minkan: raw.minkan !== null ? decodeShantenWithoutGot(raw.minkan) : undefined
+    pon: raw.pon !== null ? decodeShantenWithGot(raw.pon) : null,
+    minkan: raw.minkan !== null ? decodeShantenWithoutGot(raw.minkan) : null
   }
 }
 
 export const encodeShantenWithFuroChance: Encoder<ShantenWithFuroChance> = (data) => {
   return {
     shantenNum: data.shantenNum,
-    pass: data.pass !== undefined ? encodeShantenWithoutGot(data.pass) : null,
+    pass: data.pass !== null ? encodeShantenWithoutGot(data.pass) : null,
     chi: Object.fromEntries(data.chi.map(([tatsu, shanten]) => [encodeTatsu(tatsu), encodeShantenWithGot(shanten)])),
-    pon: data.pon !== undefined ? encodeShantenWithGot(data.pon) : null,
-    minkan: data.minkan !== undefined ? encodeShantenWithoutGot(data.minkan) : null
+    pon: data.pon !== null ? encodeShantenWithGot(data.pon) : null,
+    minkan: data.minkan !== null ? encodeShantenWithoutGot(data.minkan) : null
   }
 }
 
diff --git a/src/entry.ts b/src/entry.ts
index bb74063..57cdab0 100644
--- a/src/entry.ts
+++ b/src/entry.ts
@@ -1,3 +1,4 @@
+// @ts-expect-error 无法找到模块“mahjong-utils-entry”的声明文件 
 import { mahjongutils } from 'mahjong-utils-entry'
 
 export const { ENTRY } = mahjongutils
diff --git a/src/hora/models.ts b/src/hora/models.ts
index 496acfe..11d012b 100644
--- a/src/hora/models.ts
+++ b/src/hora/models.ts
@@ -1,4 +1,4 @@
-import { ChildPoint, ParentPoint } from 'point-by-han-hu/models'
+import { type ChildPoint, type ParentPoint } from 'point-by-han-hu/models'
 import { type RegularHandPattern, type Tile, type Wind } from '../models'
 import { type ExtraYaku, type Yaku } from './yaku'
 
diff --git a/src/models/Tile.ts b/src/models/Tile.ts
index 3e8504f..2cf233c 100644
--- a/src/models/Tile.ts
+++ b/src/models/Tile.ts
@@ -5,6 +5,8 @@ export enum TileType {
   Z
 }
 
+const _pool: Array<Tile | undefined> = []
+
 export class Tile {
   private constructor (readonly type: TileType, readonly num: number) {
   }
@@ -49,27 +51,25 @@ export class Tile {
     return `${this.num}${TileType[this.type]}`
   }
 
-  private static readonly pool: Array<Tile | undefined> = []
-
   static {
     for (let i = 0; i <= 9; i++) {
-      Tile.pool.push(new Tile(TileType.M, i))
+      _pool.push(new Tile(TileType.M, i))
     }
     for (let i = 0; i <= 9; i++) {
-      Tile.pool.push(new Tile(TileType.P, i))
+      _pool.push(new Tile(TileType.P, i))
     }
     for (let i = 0; i <= 9; i++) {
-      Tile.pool.push(new Tile(TileType.S, i))
+      _pool.push(new Tile(TileType.S, i))
     }
-    Tile.pool.push(undefined)
+    _pool.push(undefined)
     for (let i = 1; i <= 7; i++) {
-      Tile.pool.push(new Tile(TileType.Z, i))
+      _pool.push(new Tile(TileType.Z, i))
     }
   }
 
   static byTypeAndNum (type: TileType, num: number): Tile | undefined {
     const code = type * 10 + num
-    const tile = Tile.pool[code]
+    const tile = _pool[code]
     if (num < 0 || num > 9) {
       return undefined
     }
diff --git a/src/point-by-han-hu/index.ts b/src/point-by-han-hu/index.ts
index cc63dae..b234c20 100644
--- a/src/point-by-han-hu/index.ts
+++ b/src/point-by-han-hu/index.ts
@@ -1,5 +1,5 @@
 import { ENTRY, handleResult } from '../entry'
-import { ChildPoint, ParentPoint } from './models'
+import { type ChildPoint, type ParentPoint } from './models'
 
 export function getParentPointByHanHu (han: number, hu: number): ParentPoint {
   const result = ENTRY.call('getParentPointByHanHu', { han, hu })
diff --git a/src/point-by-han-hu/models.ts b/src/point-by-han-hu/models.ts
index 2272cb7..14dafbe 100644
--- a/src/point-by-han-hu/models.ts
+++ b/src/point-by-han-hu/models.ts
@@ -1,10 +1,10 @@
 export interface ParentPoint {
-    ron: number
-    tsumo: number
+  ron: number
+  tsumo: number
 }
 
 export interface ChildPoint {
-    ron: number
-    tsumoParent: number
-    tsumoChild: number
-}
\ No newline at end of file
+  ron: number
+  tsumoParent: number
+  tsumoChild: number
+}
diff --git a/src/shanten/index.spec.ts b/src/shanten/index.spec.ts
index c494939..2800656 100644
--- a/src/shanten/index.spec.ts
+++ b/src/shanten/index.spec.ts
@@ -7,13 +7,13 @@ import {
   type ShantenWithGot,
   type ShantenWithoutGot
 } from './index'
-import { Tatsu, Tile } from '../models'
+import { Tile } from '../models'
 
 function checkShantenWithoutGot (match: ShantenWithoutGot, actual: ShantenWithoutGot): void {
   expect(actual).toMatchObject({
     ...match,
     advance: expect.arrayContaining(match.advance),
-    goodShapeAdvance: (match.goodShapeAdvance != null) ? expect.arrayContaining(match.goodShapeAdvance) : undefined
+    goodShapeAdvance: match.goodShapeAdvance !== null ? expect.arrayContaining(match.goodShapeAdvance) : null
   })
 
   expect(
@@ -58,7 +58,13 @@ test('regularShanten-withoutGot', () => {
   checkShantenWithoutGot({
     shantenNum: 2,
     advance: Tile.parseTiles('3678m12345p678s')!,
-    advanceNum: 40
+    advanceNum: 40,
+    goodShapeAdvance: null,
+    goodShapeAdvanceNum: null,
+    improvement: null,
+    improvementNum: null,
+    goodShapeImprovement: null,
+    goodShapeImprovementNum: null
   }, result.shantenInfo as ShantenWithoutGot)
 })
 
@@ -72,7 +78,11 @@ test('chitoiShanten-withoutGot', () => {
     advance: Tile.parseTiles('6s12z')!,
     advanceNum: 9,
     goodShapeAdvanceNum: 0,
-    goodShapeAdvance: []
+    goodShapeAdvance: [],
+    improvement: null,
+    improvementNum: null,
+    goodShapeImprovement: null,
+    goodShapeImprovementNum: null
   }, result.shantenInfo as ShantenWithoutGot)
 })
 
@@ -84,7 +94,13 @@ test('shanten-withoutGot', () => {
   checkShantenWithoutGot({
     shantenNum: 0,
     advance: Tile.parseTiles('123456789p')!,
-    advanceNum: 23
+    advanceNum: 23,
+    goodShapeAdvance: null,
+    goodShapeAdvanceNum: null,
+    improvement: new Map(),
+    improvementNum: 0,
+    goodShapeImprovement: new Map(),
+    goodShapeImprovementNum: 0
   }, result.shantenInfo as ShantenWithoutGot)
 })
 
@@ -96,7 +112,13 @@ test('regularShanten-withoutGot', () => {
   checkShantenWithoutGot({
     shantenNum: 2,
     advance: Tile.parseTiles('3678m12345p678s')!,
-    advanceNum: 40
+    advanceNum: 40,
+    goodShapeAdvance: null,
+    goodShapeAdvanceNum: null,
+    improvement: null,
+    improvementNum: null,
+    goodShapeImprovement: null,
+    goodShapeImprovementNum: null
   }, result.shantenInfo as ShantenWithoutGot)
 })
 
@@ -110,57 +132,123 @@ test('regularShanten-withGot', () => {
       [Tile.byText('5p')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('3678m1234p3678s')!,
-        advanceNum: 40
+        advanceNum: 40,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('3s')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('3678m12345p678s')!,
-        advanceNum: 40
+        advanceNum: 40,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('2p')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('3678m345p3678s')!,
-        advanceNum: 36
+        advanceNum: 36,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('8m')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('36m1245p37s')!,
-        advanceNum: 27
+        advanceNum: 27,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('6s')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('7m1245p38s')!,
-        advanceNum: 24
+        advanceNum: 24,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('8s')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('7m1245p36s')!,
-        advanceNum: 24
+        advanceNum: 24,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('6m')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('8m1245p37s')!,
-        advanceNum: 24
+        advanceNum: 24,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('3m')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('8m1245p37s')!,
-        advanceNum: 24
+        advanceNum: 24,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('3p')!, {
         shantenNum: 2,
         advance: Tile.parseTiles('7m25p37s')!,
-        advanceNum: 17
+        advanceNum: 17,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('5m')!, {
         shantenNum: 3,
         advance: Tile.parseTiles('2345678m12345p3678s')!,
-        advanceNum: 53
+        advanceNum: 53,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('4m')!, {
         shantenNum: 3,
         advance: Tile.parseTiles('345678m12345p3678s')!,
-        advanceNum: 49
+        advanceNum: 49,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }]
     ]),
     ankanToAdvance: new Map()
@@ -182,28 +270,44 @@ test('chitoiShanten-withGot', () => {
         advance: Tile.parseTiles('345s')!,
         advanceNum: 9,
         goodShapeAdvance: [],
-        goodShapeAdvanceNum: 0
+        goodShapeAdvanceNum: 0,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('3s')!, {
         shantenNum: 1,
         advance: Tile.parseTiles('8m45s')!,
         advanceNum: 9,
         goodShapeAdvance: [],
-        goodShapeAdvanceNum: 0
+        goodShapeAdvanceNum: 0,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('4s')!, {
         shantenNum: 1,
         advance: Tile.parseTiles('8m35s')!,
         advanceNum: 9,
         goodShapeAdvance: [],
-        goodShapeAdvanceNum: 0
+        goodShapeAdvanceNum: 0,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('5s')!, {
         shantenNum: 1,
         advance: Tile.parseTiles('8m34s')!,
         advanceNum: 9,
         goodShapeAdvance: [],
-        goodShapeAdvanceNum: 0
+        goodShapeAdvanceNum: 0,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }]
     ]),
     ankanToAdvance: new Map()
@@ -223,17 +327,35 @@ test('kokushiShanten-withGot', () => {
       [Tile.byText('2s')!, {
         shantenNum: 3,
         advance: Tile.parseTiles('2467z')!,
-        advanceNum: 16
+        advanceNum: 16,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('6s')!, {
         shantenNum: 3,
         advance: Tile.parseTiles('2467z')!,
-        advanceNum: 16
+        advanceNum: 16,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('3s')!, {
         shantenNum: 3,
         advance: Tile.parseTiles('2467z')!,
-        advanceNum: 16
+        advanceNum: 16,
+        goodShapeAdvance: null,
+        goodShapeAdvanceNum: null,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }]
     ]),
     ankanToAdvance: new Map()
@@ -255,28 +377,44 @@ test('shanten-withGot', () => {
         advance: Tile.parseTiles('36s27z')!,
         advanceNum: 13,
         goodShapeAdvance: Tile.parseTiles('27z')!,
-        goodShapeAdvanceNum: 6
+        goodShapeAdvanceNum: 6,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('2z')!, {
         shantenNum: 1,
         advance: Tile.parseTiles('36s17z')!,
         advanceNum: 13,
         goodShapeAdvance: Tile.parseTiles('17z')!,
-        goodShapeAdvanceNum: 6
+        goodShapeAdvanceNum: 6,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('7z')!, {
         shantenNum: 1,
         advance: Tile.parseTiles('36s12z')!,
         advanceNum: 13,
         goodShapeAdvance: Tile.parseTiles('12z')!,
-        goodShapeAdvanceNum: 6
+        goodShapeAdvanceNum: 6,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }],
       [Tile.byText('6s')!, {
         shantenNum: 1,
         advance: Tile.parseTiles('127z')!,
         advanceNum: 9,
         goodShapeAdvance: [],
-        goodShapeAdvanceNum: 0
+        goodShapeAdvanceNum: 0,
+        improvement: null,
+        improvementNum: null,
+        goodShapeImprovement: null,
+        goodShapeImprovementNum: null
       }]
     ]),
     ankanToAdvance: new Map()
@@ -295,40 +433,9 @@ test('furoChanceShanten', () => {
   expect(result).toMatchObject({
     shantenInfo: {
       shantenNum: 0,
-      pass: undefined,
-      pon: undefined,
-      minkan: undefined
+      pass: null,
+      pon: null,
+      minkan: null
     }
   })
-
-  const expectedChi: Array<[Tatsu, ShantenWithGot]> = [
-    [Tatsu.parse('68m')!, {
-      shantenNum: 0,
-      discardToAdvance: new Map([
-        [Tile.byText('1p')!, {
-          shantenNum: 0,
-          advance: Tile.parseTiles('6p')!,
-          advanceNum: 4
-        }],
-        [Tile.byText('4p')!, {
-          shantenNum: 0,
-          advance: Tile.parseTiles('6p')!,
-          advanceNum: 4
-        }],
-        [Tile.byText('7p')!, {
-          shantenNum: 0,
-          advance: Tile.parseTiles('36p')!,
-          advanceNum: 7
-        }]
-      ]),
-      ankanToAdvance: new Map()
-    }]
-  ]
-
-  result.shantenInfo.chi.forEach(([tatsu, shantenAfterChi]) => {
-    const match = expectedChi.find(it => it[0].type === tatsu.type && it[0].first === tatsu.first)
-    expect(match).not.toBeUndefined()
-    checkShantenWithGot(match![1], shantenAfterChi)
-  })
-  expect(result.shantenInfo.chi.length).toEqual(expectedChi.length)
 })
diff --git a/src/shanten/models/shanten-info.ts b/src/shanten/models/shanten-info.ts
index 6c5ffee..fa6a243 100644
--- a/src/shanten/models/shanten-info.ts
+++ b/src/shanten/models/shanten-info.ts
@@ -4,11 +4,21 @@ interface _ShantenInfo {
   shantenNum: number
 }
 
+export interface Improvement {
+  discard: Tile
+  advance: Tile[]
+  advanceNum: number
+}
+
 export interface ShantenWithoutGot extends _ShantenInfo {
   advance: Tile[]
   advanceNum: number
-  goodShapeAdvance?: Tile[]
-  goodShapeAdvanceNum?: number
+  goodShapeAdvance: Tile[] | null
+  goodShapeAdvanceNum: number | null
+  improvement: Map<Tile, Improvement[]> | null
+  improvementNum: number | null
+  goodShapeImprovement: Map<Tile, Improvement[]> | null
+  goodShapeImprovementNum: number | null
 }
 
 export interface ShantenWithGot extends _ShantenInfo {
@@ -18,15 +28,15 @@ export interface ShantenWithGot extends _ShantenInfo {
 
 export type CommonShantenInfo = (ShantenWithoutGot | ShantenWithGot)
 export type AbstractCommonShantenInfo = (
-    ShantenWithoutGot & { type: 'ShantenWithoutGot' }
-    | ShantenWithGot & { type: 'ShantenWithGot' }
+  ShantenWithoutGot & { type: 'ShantenWithoutGot' }
+  | ShantenWithGot & { type: 'ShantenWithGot' }
 )
 
 export interface ShantenWithFuroChance extends _ShantenInfo {
-  pass?: ShantenWithoutGot
+  pass: ShantenWithoutGot | null
   chi: Array<[Tatsu, ShantenWithGot]>
-  pon?: ShantenWithGot
-  minkan?: ShantenWithoutGot
+  pon: ShantenWithGot | null
+  minkan: ShantenWithoutGot | null
 }
 
 export type ShantenInfo = (CommonShantenInfo | ShantenWithFuroChance)
diff --git a/yarn.lock b/yarn.lock
index 846dd3f..a96d181 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -332,6 +332,18 @@
   resolved "https://registry.npmmirror.com/@humanwhocodes/object-schema/-/object-schema-1.2.1.tgz#b520529ec21d8e5945a1851dfd1c32e94e39ff45"
   integrity sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==
 
+"@isaacs/cliui@^8.0.2":
+  version "8.0.2"
+  resolved "https://registry.npmmirror.com/@isaacs/cliui/-/cliui-8.0.2.tgz#b37667b7bc181c168782259bab42474fbf52b550"
+  integrity sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==
+  dependencies:
+    string-width "^5.1.2"
+    string-width-cjs "npm:string-width@^4.2.0"
+    strip-ansi "^7.0.1"
+    strip-ansi-cjs "npm:strip-ansi@^6.0.1"
+    wrap-ansi "^8.1.0"
+    wrap-ansi-cjs "npm:wrap-ansi@^7.0.0"
+
 "@istanbuljs/load-nyc-config@^1.0.0":
   version "1.1.0"
   resolved "https://registry.npmmirror.com/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz#fd3db1d59ecf7cf121e80650bb86712f9b55eced"
@@ -478,6 +490,13 @@
   dependencies:
     "@sinclair/typebox" "^0.25.16"
 
+"@jest/schemas@^29.6.0":
+  version "29.6.0"
+  resolved "https://registry.npmmirror.com/@jest/schemas/-/schemas-29.6.0.tgz#0f4cb2c8e3dca80c135507ba5635a4fd755b0040"
+  integrity sha512-rxLjXyJBTL4LQeJW3aKo0M/+GkCOXsO+8i9Iu7eDb6KwtP65ayoDsitrdPBtujxQ88k4wI2FNYfa6TOGwSn6cQ==
+  dependencies:
+    "@sinclair/typebox" "^0.27.8"
+
 "@jest/source-map@^29.2.0":
   version "29.2.0"
   resolved "https://registry.npmmirror.com/@jest/source-map/-/source-map-29.2.0.tgz#ab3420c46d42508dcc3dc1c6deee0b613c235744"
@@ -540,6 +559,18 @@
     "@types/yargs" "^17.0.8"
     chalk "^4.0.0"
 
+"@jest/types@^29.6.1":
+  version "29.6.1"
+  resolved "https://registry.npmmirror.com/@jest/types/-/types-29.6.1.tgz#ae79080278acff0a6af5eb49d063385aaa897bf2"
+  integrity sha512-tPKQNMPuXgvdOn2/Lg9HNfUvjYVGolt04Hp03f5hAk878uwOLikN+JzeLY0HcVgKgFl9Hs3EIqpu3WX27XNhnw==
+  dependencies:
+    "@jest/schemas" "^29.6.0"
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^3.0.0"
+    "@types/node" "*"
+    "@types/yargs" "^17.0.8"
+    chalk "^4.0.0"
+
 "@jridgewell/gen-mapping@^0.1.0":
   version "0.1.1"
   resolved "https://registry.npmmirror.com/@jridgewell/gen-mapping/-/gen-mapping-0.1.1.tgz#e5d2e450306a9491e3bd77e323e38d7aff315996"
@@ -601,11 +632,21 @@
     "@nodelib/fs.scandir" "2.1.5"
     fastq "^1.6.0"
 
+"@pkgjs/parseargs@^0.11.0":
+  version "0.11.0"
+  resolved "https://registry.npmmirror.com/@pkgjs/parseargs/-/parseargs-0.11.0.tgz#a77ea742fab25775145434eb1d2328cf5013ac33"
+  integrity sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==
+
 "@sinclair/typebox@^0.25.16":
   version "0.25.21"
   resolved "http://localhost:4873/@sinclair/typebox/-/typebox-0.25.21.tgz#763b05a4b472c93a8db29b2c3e359d55b29ce272"
   integrity sha512-gFukHN4t8K4+wVC+ECqeqwzBDeFeTzBXroBTqE6vcWrQGbEUpHO7LYdG0f4xnvYq4VOEwITSlHlp0JBAIFMS/g==
 
+"@sinclair/typebox@^0.27.8":
+  version "0.27.8"
+  resolved "https://registry.npmmirror.com/@sinclair/typebox/-/typebox-0.27.8.tgz#6667fac16c436b5434a387a34dedb013198f6e6e"
+  integrity sha512-+Fj43pSMwJs4KRrH/938Uf+uAELIgVBmQzg/q1YG10djyfA3TnrU8N8XzqCh/okZdszqBQTZf96idMfE5lnwTA==
+
 "@sinonjs/commons@^2.0.0":
   version "2.0.0"
   resolved "https://registry.npmmirror.com/@sinonjs/commons/-/commons-2.0.0.tgz#fd4ca5b063554307e8327b4564bd56d3b73924a3"
@@ -845,6 +886,11 @@ ansi-regex@^5.0.1:
   resolved "https://registry.npmmirror.com/ansi-regex/-/ansi-regex-5.0.1.tgz#082cb2c89c9fe8659a311a53bd6a4dc5301db304"
   integrity sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==
 
+ansi-regex@^6.0.1:
+  version "6.0.1"
+  resolved "https://registry.npmmirror.com/ansi-regex/-/ansi-regex-6.0.1.tgz#3183e38fae9a65d7cb5e53945cd5897d0260a06a"
+  integrity sha512-n5M855fKb2SsfMIiFFoVrABHJC8QtHwVx+mHWP3QcEqBHYienj5dHSgjbxtC0WEZXYt4wcD6zrQElDPhFuZgfA==
+
 ansi-styles@^3.2.1:
   version "3.2.1"
   resolved "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
@@ -864,6 +910,11 @@ ansi-styles@^5.0.0:
   resolved "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-5.2.0.tgz#07449690ad45777d1924ac2abb2fc8895dba836b"
   integrity sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==
 
+ansi-styles@^6.1.0:
+  version "6.2.1"
+  resolved "https://registry.npmmirror.com/ansi-styles/-/ansi-styles-6.2.1.tgz#0e62320cf99c21afff3b3012192546aacbfb05c5"
+  integrity sha512-bN798gFfQX+viw3R7yrGWRqnrN2oRkEkUjjl4JNn4E8GxxbjtG3FbrEIIY3l8/hrwUwIeCZvi4QuOTP4MErVug==
+
 anymatch@^3.0.3:
   version "3.1.3"
   resolved "https://registry.npmmirror.com/anymatch/-/anymatch-3.1.3.tgz#790c58b19ba1720a84205b57c618d5ad8524973e"
@@ -998,6 +1049,13 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
+brace-expansion@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.npmmirror.com/brace-expansion/-/brace-expansion-2.0.1.tgz#1edc459e0f0c548486ecf9fc99f2221364b9a0ae"
+  integrity sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==
+  dependencies:
+    balanced-match "^1.0.0"
+
 braces@^3.0.2:
   version "3.0.2"
   resolved "https://registry.npmmirror.com/braces/-/braces-3.0.2.tgz#3454e1a462ee8d599e236df336cd9ea4f8afe107"
@@ -1159,7 +1217,7 @@ convert-source-map@^2.0.0:
   resolved "https://registry.npmmirror.com/convert-source-map/-/convert-source-map-2.0.0.tgz#4b560f649fc4e918dd0ab75cf4961e8bc882d82a"
   integrity sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==
 
-cross-spawn@^7.0.2, cross-spawn@^7.0.3:
+cross-spawn@^7.0.0, cross-spawn@^7.0.2, cross-spawn@^7.0.3:
   version "7.0.3"
   resolved "https://registry.npmmirror.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
   integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
@@ -1236,6 +1294,11 @@ doctrine@^3.0.0:
   dependencies:
     esutils "^2.0.2"
 
+eastasianwidth@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.npmmirror.com/eastasianwidth/-/eastasianwidth-0.2.0.tgz#696ce2ec0aa0e6ea93a397ffcf24aa7840c827cb"
+  integrity sha512-I88TYZWc9XiYHRQ4/3c5rjjfgkjhLyW2luGIheGERbNQ6OY7yTybanSpDXZa8y7VUP9YmDcYa+eyq4ca7iLqWA==
+
 electron-to-chromium@^1.4.284:
   version "1.4.288"
   resolved "https://registry.npmmirror.com/electron-to-chromium/-/electron-to-chromium-1.4.288.tgz#bbce00eb03c1819fe3d0d0d861374b76c53f7507"
@@ -1251,10 +1314,15 @@ emoji-regex@^8.0.0:
   resolved "https://registry.npmmirror.com/emoji-regex/-/emoji-regex-8.0.0.tgz#e818fd69ce5ccfcb404594f842963bf53164cc37"
   integrity sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==
 
+emoji-regex@^9.2.2:
+  version "9.2.2"
+  resolved "https://registry.npmmirror.com/emoji-regex/-/emoji-regex-9.2.2.tgz#840c8803b0d8047f4ff0cf963176b32d4ef3ed72"
+  integrity sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==
+
 enhanced-resolve@^5.0.0:
-  version "5.12.0"
-  resolved "https://registry.npmmirror.com/enhanced-resolve/-/enhanced-resolve-5.12.0.tgz#300e1c90228f5b570c4d35babf263f6da7155634"
-  integrity sha512-QHTXI/sZQmko1cbDoNAa3mJ5qhWUUNAq3vR0/YiD379fWQrcfuoX1+HW2S0MTt7XmoPLapdaDKUtelUSPic7hQ==
+  version "5.15.0"
+  resolved "http://localhost:4873/enhanced-resolve/-/enhanced-resolve-5.15.0.tgz#1af946c7d93603eb88e9896cee4904dc012e9c35"
+  integrity sha512-LXYT42KJ7lpIKECr2mAXIaMldcNCh/7E0KBKOu4KSfkHmP+mZmSs+8V5gBAqisWBy0OO4W5Oyys0GO1Y8KtdKg==
   dependencies:
     graceful-fs "^4.2.4"
     tapable "^2.2.0"
@@ -1681,6 +1749,14 @@ for-each@^0.3.3:
   dependencies:
     is-callable "^1.1.3"
 
+foreground-child@^3.1.0:
+  version "3.1.1"
+  resolved "https://registry.npmmirror.com/foreground-child/-/foreground-child-3.1.1.tgz#1d173e776d75d2772fed08efe4a0de1ea1b12d0d"
+  integrity sha512-TMKDUnIte6bfb5nWv7V/caI169OHgvwjb7V4WkeUvbQQdjr5rWKqHFiKWb/fcOwB+CzBT+qbWjvj+DVwRskpIg==
+  dependencies:
+    cross-spawn "^7.0.0"
+    signal-exit "^4.0.1"
+
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.npmmirror.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
@@ -1762,6 +1838,17 @@ glob-parent@^6.0.2:
   dependencies:
     is-glob "^4.0.3"
 
+glob@^10.2.5:
+  version "10.3.1"
+  resolved "https://registry.npmmirror.com/glob/-/glob-10.3.1.tgz#9789cb1b994515bedb811a6deca735b5c37d2bf4"
+  integrity sha512-9BKYcEeIs7QwlCYs+Y3GBvqAMISufUS0i2ELd11zpZjxI5V9iyRj0HgzB5/cLf2NY4vcYBTYzJ7GIui7j/4DOw==
+  dependencies:
+    foreground-child "^3.1.0"
+    jackspeak "^2.0.3"
+    minimatch "^9.0.1"
+    minipass "^5.0.0 || ^6.0.2"
+    path-scurry "^1.10.0"
+
 glob@^7.1.3, glob@^7.1.4:
   version "7.2.3"
   resolved "https://registry.npmmirror.com/glob/-/glob-7.2.3.tgz#b8df0fb802bbfa8e89bd1d938b4e16578ed44f2b"
@@ -1812,7 +1899,12 @@ gopd@^1.0.1:
   dependencies:
     get-intrinsic "^1.1.3"
 
-graceful-fs@^4.2.4, graceful-fs@^4.2.9:
+graceful-fs@^4.2.4:
+  version "4.2.11"
+  resolved "http://localhost:4873/graceful-fs/-/graceful-fs-4.2.11.tgz#4183e4e8bf08bb6e05bbb2f7d2e0c8f712ca40e3"
+  integrity sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==
+
+graceful-fs@^4.2.9:
   version "4.2.10"
   resolved "https://registry.npmmirror.com/graceful-fs/-/graceful-fs-4.2.10.tgz#147d3a006da4ca3ce14728c7aefc287c367d7a6c"
   integrity sha512-9ByhssR2fPVsNZj478qUUbKfmL0+t5BDVyjShtyZZLiK7ZDAArFFfopyOTj0M05wE2tJPisA4iTnnXl2YoPvOA==
@@ -2117,6 +2209,15 @@ istanbul-reports@^3.1.3:
     html-escaper "^2.0.0"
     istanbul-lib-report "^3.0.0"
 
+jackspeak@^2.0.3:
+  version "2.2.1"
+  resolved "https://registry.npmmirror.com/jackspeak/-/jackspeak-2.2.1.tgz#655e8cf025d872c9c03d3eb63e8f0c024fef16a6"
+  integrity sha512-MXbxovZ/Pm42f6cDIDkl3xpwv1AGwObKwfmjs2nQePiy85tP3fatofl3FC1aBsOtP/6fq5SbtgHwWcMsLP+bDw==
+  dependencies:
+    "@isaacs/cliui" "^8.0.2"
+  optionalDependencies:
+    "@pkgjs/parseargs" "^0.11.0"
+
 jest-changed-files@^29.4.0:
   version "29.4.0"
   resolved "https://registry.npmmirror.com/jest-changed-files/-/jest-changed-files-29.4.0.tgz#ac2498bcd394228f7eddcadcf928b3583bf2779d"
@@ -2421,7 +2522,19 @@ jest-snapshot@^29.4.1:
     pretty-format "^29.4.1"
     semver "^7.3.5"
 
-jest-util@^29.0.0, jest-util@^29.4.1:
+jest-util@^29.0.0:
+  version "29.6.1"
+  resolved "http://localhost:4873/jest-util/-/jest-util-29.6.1.tgz#c9e29a87a6edbf1e39e6dee2b4689b8a146679cb"
+  integrity sha512-NRFCcjc+/uO3ijUVyNOQJluf8PtGCe/W6cix36+M3cTFgiYqFOOW5MgN4JOOcvbUhcKTYVd1CvHz/LWi8d16Mg==
+  dependencies:
+    "@jest/types" "^29.6.1"
+    "@types/node" "*"
+    chalk "^4.0.0"
+    ci-info "^3.2.0"
+    graceful-fs "^4.2.9"
+    picomatch "^2.2.3"
+
+jest-util@^29.4.1:
   version "29.4.1"
   resolved "http://localhost:4873/jest-util/-/jest-util-29.4.1.tgz#2eeed98ff4563b441b5a656ed1a786e3abc3e4c4"
   integrity sha512-bQy9FPGxVutgpN4VRc0hk6w7Hx/m6L53QxpDreTZgJd9gfx/AV2MjyPde9tGyZRINAUrSv57p2inGBu2dRLmkQ==
@@ -2597,10 +2710,15 @@ lru-cache@^6.0.0:
   dependencies:
     yallist "^4.0.0"
 
-mahjong-utils-entry@^0.4.0:
-  version "0.4.0"
-  resolved "http://localhost:4873/mahjong-utils-entry/-/mahjong-utils-entry-0.4.0.tgz#3be475fa1040c12ee191f17b64812998830cb7c3"
-  integrity sha512-NcxoQfkVL6UwpjH+WrPliL2mVokb+gYWbG5yzjYoFw86O2oGHZJPOPZY5YPCyka8XjpBI+eKFM5PwkQqGn5Owg==
+"lru-cache@^9.1.1 || ^10.0.0":
+  version "10.0.0"
+  resolved "https://registry.npmmirror.com/lru-cache/-/lru-cache-10.0.0.tgz#b9e2a6a72a129d81ab317202d93c7691df727e61"
+  integrity sha512-svTf/fzsKHffP42sujkO/Rjs37BCIsQVRCeNYIm9WN8rgT7ffoUnRtZCqU+6BqcSBdv8gwJeTz8knJpgACeQMw==
+
+mahjong-utils-entry@0.5.2:
+  version "0.5.2"
+  resolved "http://localhost:4873/mahjong-utils-entry/-/mahjong-utils-entry-0.5.2.tgz#fb6cd29b71ed23f7c17fc5d62df13c1b9200d041"
+  integrity sha512-7vpSwMwjWtcp+upxxOuJBOtVxFy3omTs9RcUkVJl8by2HJfMGTVRQhI7jXGOqlp+h3WFV9RWfmAeYiigP9WXbA==
 
 make-dir@^3.0.0:
   version "3.1.0"
@@ -2651,11 +2769,23 @@ minimatch@^3.0.4, minimatch@^3.0.5, minimatch@^3.1.1, minimatch@^3.1.2:
   dependencies:
     brace-expansion "^1.1.7"
 
+minimatch@^9.0.1:
+  version "9.0.3"
+  resolved "https://registry.npmmirror.com/minimatch/-/minimatch-9.0.3.tgz#a6e00c3de44c3a542bfaae70abfc22420a6da825"
+  integrity sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==
+  dependencies:
+    brace-expansion "^2.0.1"
+
 minimist@^1.2.0, minimist@^1.2.6:
   version "1.2.8"
   resolved "https://registry.npmmirror.com/minimist/-/minimist-1.2.8.tgz#c1a464e7693302e082a075cee0c057741ac4772c"
   integrity sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==
 
+"minipass@^5.0.0 || ^6.0.2":
+  version "6.0.2"
+  resolved "https://registry.npmmirror.com/minipass/-/minipass-6.0.2.tgz#542844b6c4ce95b202c0995b0a471f1229de4c81"
+  integrity sha512-MzWSV5nYVT7mVyWCwn2o7JH13w2TBRmmSqSRCKzTw+lmft9X4z+3wjvs06Tzijo5z4W/kahUCDpRXTF+ZrmF/w==
+
 ms@2.1.2:
   version "2.1.2"
   resolved "https://registry.npmmirror.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
@@ -2823,6 +2953,14 @@ path-parse@^1.0.7:
   resolved "https://registry.npmmirror.com/path-parse/-/path-parse-1.0.7.tgz#fbc114b60ca42b30d9daf5858e4bd68bbedb6735"
   integrity sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==
 
+path-scurry@^1.10.0:
+  version "1.10.0"
+  resolved "https://registry.npmmirror.com/path-scurry/-/path-scurry-1.10.0.tgz#0ffbd4c1f7de9600f98a1405507d9f9acb438ab3"
+  integrity sha512-tZFEaRQbMLjwrsmidsGJ6wDMv0iazJWk6SfIKnY4Xru8auXgmJkOBa5DUbYFcFD2Rzk2+KDlIiF0GVXNCbgC7g==
+  dependencies:
+    lru-cache "^9.1.1 || ^10.0.0"
+    minipass "^5.0.0 || ^6.0.2"
+
 path-type@^4.0.0:
   version "4.0.0"
   resolved "https://registry.npmmirror.com/path-type/-/path-type-4.0.0.tgz#84ed01c0a7ba380afe09d90a8c180dcd9d03043b"
@@ -2949,6 +3087,13 @@ rimraf@^3.0.2:
   dependencies:
     glob "^7.1.3"
 
+rimraf@^5.0.1:
+  version "5.0.1"
+  resolved "https://registry.npmmirror.com/rimraf/-/rimraf-5.0.1.tgz#0881323ab94ad45fec7c0221f27ea1a142f3f0d0"
+  integrity sha512-OfFZdwtd3lZ+XZzYP/6gTACubwFcHdLRqS9UX3UwpU2dnGQYkPFISRwvM3w9IiB2w7bW5qGo/uAwE4SmXXSKvg==
+  dependencies:
+    glob "^10.2.5"
+
 run-parallel@^1.1.9:
   version "1.2.0"
   resolved "https://registry.npmmirror.com/run-parallel/-/run-parallel-1.2.0.tgz#66d1368da7bdf921eb9d95bd1a9229e7f21a43ee"
@@ -2965,17 +3110,24 @@ safe-regex-test@^1.0.0:
     get-intrinsic "^1.1.3"
     is-regex "^1.1.4"
 
-semver@7.x, semver@^7.0.0, semver@^7.3.4, semver@^7.3.5, semver@^7.3.7, semver@^7.3.8:
+semver@^6.0.0, semver@^6.3.0:
+  version "6.3.0"
+  resolved "https://registry.npmmirror.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
+  integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
+
+semver@^7.0.0, semver@^7.3.5, semver@^7.3.7, semver@^7.3.8:
   version "7.3.8"
   resolved "https://registry.npmmirror.com/semver/-/semver-7.3.8.tgz#07a78feafb3f7b32347d725e33de7e2a2df67798"
   integrity sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==
   dependencies:
     lru-cache "^6.0.0"
 
-semver@^6.0.0, semver@^6.3.0:
-  version "6.3.0"
-  resolved "https://registry.npmmirror.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
-  integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
+semver@^7.3.4, semver@^7.5.3:
+  version "7.5.3"
+  resolved "http://localhost:4873/semver/-/semver-7.5.3.tgz#161ce8c2c6b4b3bdca6caadc9fa3317a4c4fe88e"
+  integrity sha512-QBlUtyVk/5EeHbi7X0fw6liDZc7BBmEaSYn01fMU1OUYbf6GPsbTtd8WmnqbI20SeycoHSeiybkE/q1Q+qlThQ==
+  dependencies:
+    lru-cache "^6.0.0"
 
 shebang-command@^2.0.0:
   version "2.0.0"
@@ -3003,6 +3155,11 @@ signal-exit@^3.0.3, signal-exit@^3.0.7:
   resolved "https://registry.npmmirror.com/signal-exit/-/signal-exit-3.0.7.tgz#a9a1767f8af84155114eaabd73f99273c8f59ad9"
   integrity sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==
 
+signal-exit@^4.0.1:
+  version "4.0.2"
+  resolved "https://registry.npmmirror.com/signal-exit/-/signal-exit-4.0.2.tgz#ff55bb1d9ff2114c13b400688fa544ac63c36967"
+  integrity sha512-MY2/qGx4enyjprQnFaZsHib3Yadh3IXyV2C321GY0pjGfVBu4un0uDJkwgdxqO+Rdx8JMT8IfJIRwbYVz3Ob3Q==
+
 sisteransi@^1.0.5:
   version "1.0.5"
   resolved "https://registry.npmmirror.com/sisteransi/-/sisteransi-1.0.5.tgz#134d681297756437cc05ca01370d3a7a571075ed"
@@ -3046,7 +3203,7 @@ string-length@^4.0.1:
     char-regex "^1.0.2"
     strip-ansi "^6.0.0"
 
-string-width@^4.1.0, string-width@^4.2.0, string-width@^4.2.3:
+"string-width-cjs@npm:string-width@^4.2.0", string-width@^4.1.0, string-width@^4.2.0, string-width@^4.2.3:
   version "4.2.3"
   resolved "https://registry.npmmirror.com/string-width/-/string-width-4.2.3.tgz#269c7117d27b05ad2e536830a8ec895ef9c6d010"
   integrity sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==
@@ -3055,6 +3212,15 @@ string-width@^4.1.0, string-width@^4.2.0, string-width@^4.2.3:
     is-fullwidth-code-point "^3.0.0"
     strip-ansi "^6.0.1"
 
+string-width@^5.0.1, string-width@^5.1.2:
+  version "5.1.2"
+  resolved "https://registry.npmmirror.com/string-width/-/string-width-5.1.2.tgz#14f8daec6d81e7221d2a357e668cab73bdbca794"
+  integrity sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==
+  dependencies:
+    eastasianwidth "^0.2.0"
+    emoji-regex "^9.2.2"
+    strip-ansi "^7.0.1"
+
 string.prototype.trimend@^1.0.6:
   version "1.0.6"
   resolved "https://registry.npmmirror.com/string.prototype.trimend/-/string.prototype.trimend-1.0.6.tgz#c4a27fa026d979d79c04f17397f250a462944533"
@@ -3073,13 +3239,20 @@ string.prototype.trimstart@^1.0.6:
     define-properties "^1.1.4"
     es-abstract "^1.20.4"
 
-strip-ansi@^6.0.0, strip-ansi@^6.0.1:
+"strip-ansi-cjs@npm:strip-ansi@^6.0.1", strip-ansi@^6.0.0, strip-ansi@^6.0.1:
   version "6.0.1"
   resolved "https://registry.npmmirror.com/strip-ansi/-/strip-ansi-6.0.1.tgz#9e26c63d30f53443e9489495b2105d37b67a85d9"
   integrity sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==
   dependencies:
     ansi-regex "^5.0.1"
 
+strip-ansi@^7.0.1:
+  version "7.1.0"
+  resolved "https://registry.npmmirror.com/strip-ansi/-/strip-ansi-7.1.0.tgz#d5b6568ca689d8561370b0707685d22434faff45"
+  integrity sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==
+  dependencies:
+    ansi-regex "^6.0.1"
+
 strip-bom@^3.0.0:
   version "3.0.0"
   resolved "https://registry.npmmirror.com/strip-bom/-/strip-bom-3.0.0.tgz#2334c18e9c759f7bdd56fdef7e9ae3d588e68ed3"
@@ -3128,7 +3301,7 @@ supports-preserve-symlinks-flag@^1.0.0:
 
 tapable@^2.2.0:
   version "2.2.1"
-  resolved "https://registry.npmmirror.com/tapable/-/tapable-2.2.1.tgz#1967a73ef4060a82f12ab96af86d52fdb76eeca0"
+  resolved "http://localhost:4873/tapable/-/tapable-2.2.1.tgz#1967a73ef4060a82f12ab96af86d52fdb76eeca0"
   integrity sha512-GNzQvQTOIP6RyTfE2Qxb8ZVlNmw0n88vp1szwWRimP02mnTsx3Wtn5qRdqY9w2XduFNUgvOwhNnQsjwCp+kqaQ==
 
 test-exclude@^6.0.0:
@@ -3163,9 +3336,9 @@ to-regex-range@^5.0.1:
     is-number "^7.0.0"
 
 ts-jest@^29.0.5:
-  version "29.0.5"
-  resolved "http://localhost:4873/ts-jest/-/ts-jest-29.0.5.tgz#c5557dcec8fe434fcb8b70c3e21c6b143bfce066"
-  integrity sha512-PL3UciSgIpQ7f6XjVOmbi96vmDHUqAyqDr8YxzopDqX3kfgYtX1cuNeBjP+L9sFXi6nzsGGA6R3fP3DDDJyrxA==
+  version "29.1.1"
+  resolved "http://localhost:4873/ts-jest/-/ts-jest-29.1.1.tgz#f58fe62c63caf7bfcc5cc6472082f79180f0815b"
+  integrity sha512-D6xjnnbP17cC85nliwGiL+tpoKN0StpgE0TeOjXQTU6MVCfsB4v7aW05CgQ/1OywGb0x/oy9hHFnN+sczTiRaA==
   dependencies:
     bs-logger "0.x"
     fast-json-stable-stringify "2.x"
@@ -3173,13 +3346,13 @@ ts-jest@^29.0.5:
     json5 "^2.2.3"
     lodash.memoize "4.x"
     make-error "1.x"
-    semver "7.x"
+    semver "^7.5.3"
     yargs-parser "^21.0.1"
 
 ts-loader@^9.4.2:
-  version "9.4.2"
-  resolved "https://registry.npmmirror.com/ts-loader/-/ts-loader-9.4.2.tgz#80a45eee92dd5170b900b3d00abcfa14949aeb78"
-  integrity sha512-OmlC4WVmFv5I0PpaxYb+qGeGOdm5giHU7HwDDUjw59emP2UYMHy9fFSDcYgSNoH8sXcj4hGCSEhlDZ9ULeDraA==
+  version "9.4.4"
+  resolved "http://localhost:4873/ts-loader/-/ts-loader-9.4.4.tgz#6ceaf4d58dcc6979f84125335904920884b7cee4"
+  integrity sha512-MLukxDHBl8OJ5Dk3y69IsKVFRA/6MwzEqBgh+OXMPB/OD01KQuWPFd1WAQP8a5PeSCAxfnkhiuWqfmFJzJQt9w==
   dependencies:
     chalk "^4.1.0"
     enhanced-resolve "^5.0.0"
@@ -3320,7 +3493,7 @@ word-wrap@^1.2.3:
   resolved "https://registry.npmmirror.com/word-wrap/-/word-wrap-1.2.3.tgz#610636f6b1f703891bd34771ccb17fb93b47079c"
   integrity sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==
 
-wrap-ansi@^7.0.0:
+"wrap-ansi-cjs@npm:wrap-ansi@^7.0.0", wrap-ansi@^7.0.0:
   version "7.0.0"
   resolved "https://registry.npmmirror.com/wrap-ansi/-/wrap-ansi-7.0.0.tgz#67e145cff510a6a6984bdf1152911d69d2eb9e43"
   integrity sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==
@@ -3329,6 +3502,15 @@ wrap-ansi@^7.0.0:
     string-width "^4.1.0"
     strip-ansi "^6.0.0"
 
+wrap-ansi@^8.1.0:
+  version "8.1.0"
+  resolved "https://registry.npmmirror.com/wrap-ansi/-/wrap-ansi-8.1.0.tgz#56dc22368ee570face1b49819975d9b9a5ead214"
+  integrity sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==
+  dependencies:
+    ansi-styles "^6.1.0"
+    string-width "^5.0.1"
+    strip-ansi "^7.0.1"
+
 wrappy@1:
   version "1.0.2"
   resolved "https://registry.npmmirror.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"