diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 00000000..5b390797
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,14 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+  ],
+  rules: {
+      "@typescript-eslint/ban-ts-comment": "off"
+  },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+};
\ No newline at end of file
diff --git a/optuna_dashboard/static/action.ts b/optuna_dashboard/static/action.ts
index 191419d6..b62e8b03 100644
--- a/optuna_dashboard/static/action.ts
+++ b/optuna_dashboard/static/action.ts
@@ -37,7 +37,7 @@ export const actionCreator = () => {
   const updateStudyDetail = (studyId: number) => {
     getStudyDetailAPI(studyId)
       .then((study) => {
-        let newVal = Object.assign({}, studyDetails)
+        const newVal = Object.assign({}, studyDetails)
         newVal[studyId] = study
         setStudyDetails(newVal)
       })
diff --git a/optuna_dashboard/static/apiClient.ts b/optuna_dashboard/static/apiClient.ts
index 213e9984..cd68c40a 100644
--- a/optuna_dashboard/static/apiClient.ts
+++ b/optuna_dashboard/static/apiClient.ts
@@ -161,8 +161,8 @@ export const createNewStudyAPI = (
     })
 }
 
-export const deleteStudyAPI = (studyId: number): Promise<{}> => {
-  return axiosInstance.delete<{}>(`/api/studies/${studyId}`).then((res) => {
+export const deleteStudyAPI = (studyId: number) => {
+  return axiosInstance.delete(`/api/studies/${studyId}`).then((res) => {
     return {}
   })
 }
diff --git a/optuna_dashboard/static/components/App.tsx b/optuna_dashboard/static/components/App.tsx
index 6fa5add2..e0c3ae5d 100644
--- a/optuna_dashboard/static/components/App.tsx
+++ b/optuna_dashboard/static/components/App.tsx
@@ -6,7 +6,7 @@ import { SnackbarProvider } from "notistack"
 import { StudyDetail } from "./StudyDetail"
 import { StudyList } from "./StudyList"
 
-export const App: FC<{}> = () => {
+export const App: FC = () => {
   return (
     <RecoilRoot>
       <SnackbarProvider maxSnack={3}>
diff --git a/optuna_dashboard/static/components/GraphHistory.tsx b/optuna_dashboard/static/components/GraphHistory.tsx
index 4ae8d7aa..c740549c 100644
--- a/optuna_dashboard/static/components/GraphHistory.tsx
+++ b/optuna_dashboard/static/components/GraphHistory.tsx
@@ -199,7 +199,7 @@ const plotHistory = (
     plotly.react(plotDomId, [])
     return
   }
-  let trialsForLinePlot: Trial[] = []
+  const trialsForLinePlot: Trial[] = []
   let currentBest: number | null = null
   filteredTrials.forEach((item) => {
     if (currentBest === null) {
@@ -228,9 +228,9 @@ const plotHistory = (
       : trial.datetime_complete!
   }
 
-  let xForLinePlot = trialsForLinePlot.map(getAxisX)
+  const xForLinePlot = trialsForLinePlot.map(getAxisX)
   xForLinePlot.push(getAxisX(filteredTrials[filteredTrials.length - 1]))
-  let yForLinePlot = trialsForLinePlot.map(
+  const yForLinePlot = trialsForLinePlot.map(
     (t: Trial): number => t.values![objectiveId]
   )
   yForLinePlot.push(yForLinePlot[yForLinePlot.length - 1])
diff --git a/optuna_dashboard/static/components/GraphIntermediateValues.tsx b/optuna_dashboard/static/components/GraphIntermediateValues.tsx
index 6a87bf00..227d7434 100644
--- a/optuna_dashboard/static/components/GraphIntermediateValues.tsx
+++ b/optuna_dashboard/static/components/GraphIntermediateValues.tsx
@@ -30,7 +30,7 @@ const plotIntermediateValue = (trials: Trial[]) => {
     return
   }
 
-  let filteredTrials = trials.filter(
+  const filteredTrials = trials.filter(
     (t) => t.state === "Complete" || t.state === "Pruned"
   )
   const plotData: Partial<plotly.PlotData>[] = filteredTrials.map((trial) => {
diff --git a/optuna_dashboard/static/components/GraphParallelCoordinate.tsx b/optuna_dashboard/static/components/GraphParallelCoordinate.tsx
index d9e81466..ac227c47 100644
--- a/optuna_dashboard/static/components/GraphParallelCoordinate.tsx
+++ b/optuna_dashboard/static/components/GraphParallelCoordinate.tsx
@@ -30,7 +30,7 @@ const plotCoordinate = (trials: Trial[], objectiveId: number) => {
     plotly.react(plotDomId, [])
     return
   }
-  let filteredTrials = trials.filter(
+  const filteredTrials = trials.filter(
     (t) => t.state === "Complete" || t.state === "Pruned"
   )
 
@@ -50,7 +50,7 @@ const plotCoordinate = (trials: Trial[], objectiveId: number) => {
   const objectiveValues: number[] = filteredTrials.map(
     (t) => t.values![objectiveId]
   )
-  let dimensions = [
+  const dimensions = [
     {
       label: "Objective value",
       values: objectiveValues,
diff --git a/optuna_dashboard/static/components/StudyDetail.tsx b/optuna_dashboard/static/components/StudyDetail.tsx
index 99d6bbfc..e32450e6 100644
--- a/optuna_dashboard/static/components/StudyDetail.tsx
+++ b/optuna_dashboard/static/components/StudyDetail.tsx
@@ -90,7 +90,7 @@ export const useStudyDetailValue = (studyId: number): StudyDetail | null => {
   return studyDetails[studyId] || null
 }
 
-export const StudyDetail: FC<{}> = () => {
+export const StudyDetail: FC = () => {
   const classes = useStyles()
   const action = actionCreator()
   const { studyId } = useParams<ParamTypes>()
@@ -209,7 +209,7 @@ const TrialTable: FC<{ studyDetail: StudyDetail | null }> = ({
 }) => {
   const trials: Trial[] = studyDetail !== null ? studyDetail.trials : []
 
-  let columns: DataGridColumn<Trial>[] = [
+  const columns: DataGridColumn<Trial>[] = [
     { field: "number", label: "Number", sortable: true, padding: "none" },
     {
       field: "state",
diff --git a/optuna_dashboard/static/components/StudyList.tsx b/optuna_dashboard/static/components/StudyList.tsx
index d88dd1f4..8e348ef1 100644
--- a/optuna_dashboard/static/components/StudyList.tsx
+++ b/optuna_dashboard/static/components/StudyList.tsx
@@ -46,7 +46,7 @@ const useStyles = makeStyles((theme: Theme) =>
   })
 )
 
-export const StudyList: FC<{}> = () => {
+export const StudyList: FC = () => {
   const classes = useStyles()
 
   const [
@@ -384,7 +384,7 @@ export const StudyList: FC<{}> = () => {
               <Select
                 value={directions[i]}
                 onChange={(e) => {
-                  let newVal: StudyDirection[] = [...directions]
+                  const newVal: StudyDirection[] = [...directions]
                   newVal[i] = e.target.value as StudyDirection
                   setDirections(newVal)
                 }}
@@ -413,7 +413,7 @@ export const StudyList: FC<{}> = () => {
             className={classes.objectiveButton}
             disabled={directions.length <= 1}
             onClick={(e) => {
-              let newVal: StudyDirection[] = [...directions]
+              const newVal: StudyDirection[] = [...directions]
               newVal.pop()
               setDirections(newVal)
             }}
diff --git a/package-lock.json b/package-lock.json
index b12a267b..c4367cc4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -228,6 +228,47 @@
       "resolved": "https://registry.npmjs.org/@emotion/hash/-/hash-0.8.0.tgz",
       "integrity": "sha512-kBJtf7PH6aWwZ6fka3zQ0p6SBYzx4fl1LoZXE2RrnYST9Xljm7WfKJrU4g/Xr3Beg72MLrp1AWNUmuYJTL7Cow=="
     },
+    "@eslint/eslintrc": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.3.0.tgz",
+      "integrity": "sha512-1JTKgrOKAHVivSvOYw+sJOunkBjUOvjqWk1DPja7ZFhIS2mX/4EgTT8M7eTK9jrKhL/FvXXEbQwIs3pg1xp3dg==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^12.1.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "lodash": "^4.17.20",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "globals": {
+          "version": "12.4.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-12.4.0.tgz",
+          "integrity": "sha512-BWICuzzDvDoH54NHKCseDanAhE3CeDorgDL5MT6LMXXj2WCnd9UC2szdk4AWLfjdgNBCXLUanXYcpBBKOSWGwg==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.8.1"
+          }
+        },
+        "ignore": {
+          "version": "4.0.6",
+          "resolved": "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz",
+          "integrity": "sha512-cyFDKrqc/YdcWFniJhzI42+AzS+gNwmUzOSFcRCQYwySuBBBy/KjuxWLZ/FHEH6Moq1NizMOBWyTcv8O4OZIMg==",
+          "dev": true
+        },
+        "type-fest": {
+          "version": "0.8.1",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+          "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
+          "dev": true
+        }
+      }
+    },
     "@material-ui/core": {
       "version": "4.11.0",
       "resolved": "https://registry.npmjs.org/@material-ui/core/-/core-4.11.0.tgz",
@@ -304,6 +345,32 @@
         "react-is": "^16.8.0"
       }
     },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.4.tgz",
+      "integrity": "sha512-33g3pMJk3bg5nXbL/+CY6I2eJDzZAni49PfJnL5fghPTggPvBd/pFNSgJsdAgWptuFu7qq/ERvOYFlhvsLTCKA==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.stat": "2.0.4",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.4.tgz",
+      "integrity": "sha512-IYlHJA0clt2+Vg7bccq+TzRdJvv19c2INqBSsoOLp1je7xjtr7J26+WXR72MCdvU9q1qTzIWDfhMf+DRvQJK4Q==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.6.tgz",
+      "integrity": "sha512-8Broas6vTtW4GIXTAHDoE32hnN2M5ykgCpWGbuXHQ15vEMqr23pB76e/GZcYsZCHALv50ktd24qhEyKr6wBtow==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.4",
+        "fastq": "^1.6.0"
+      }
+    },
     "@types/d3": {
       "version": "3.5.44",
       "resolved": "https://registry.npmjs.org/@types/d3/-/d3-3.5.44.tgz",
@@ -422,6 +489,111 @@
         "@types/react": "*"
       }
     },
+    "@typescript-eslint/eslint-plugin": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.15.0.tgz",
+      "integrity": "sha512-DJgdGZW+8CFUTz5C/dnn4ONcUm2h2T0itWD85Ob5/V27Ndie8hUoX5HKyGssvR8sUMkAIlUc/AMK67Lqa3kBIQ==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/experimental-utils": "4.15.0",
+        "@typescript-eslint/scope-manager": "4.15.0",
+        "debug": "^4.1.1",
+        "functional-red-black-tree": "^1.0.1",
+        "lodash": "^4.17.15",
+        "regexpp": "^3.0.0",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/experimental-utils": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.15.0.tgz",
+      "integrity": "sha512-V4vaDWvxA2zgesg4KPgEGiomWEBpJXvY4ZX34Y3qxK8LUm5I87L+qGIOTd9tHZOARXNRt9pLbblSKiYBlGMawg==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/scope-manager": "4.15.0",
+        "@typescript-eslint/types": "4.15.0",
+        "@typescript-eslint/typescript-estree": "4.15.0",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.15.0.tgz",
+      "integrity": "sha512-L6Dtbq8Bc7g2aZwnIBETpmUa9XDKCMzKVwAArnGp5Mn7PRNFjf3mUzq8UeBjL3K8t311hvevnyqXAMSmxO8Gpg==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/scope-manager": "4.15.0",
+        "@typescript-eslint/types": "4.15.0",
+        "@typescript-eslint/typescript-estree": "4.15.0",
+        "debug": "^4.1.1"
+      }
+    },
+    "@typescript-eslint/scope-manager": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-4.15.0.tgz",
+      "integrity": "sha512-CSNBZnCC2jEA/a+pR9Ljh8Y+5TY5qgbPz7ICEk9WCpSEgT6Pi7H2RIjxfrrbUXvotd6ta+i27sssKEH8Azm75g==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.15.0",
+        "@typescript-eslint/visitor-keys": "4.15.0"
+      }
+    },
+    "@typescript-eslint/types": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-4.15.0.tgz",
+      "integrity": "sha512-su4RHkJhS+iFwyqyXHcS8EGPlUVoC+XREfy5daivjLur9JP8GhvTmDipuRpcujtGC4M+GYhUOJCPDE3rC5NJrg==",
+      "dev": true
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-4.15.0.tgz",
+      "integrity": "sha512-jG6xTmcNbi6xzZq0SdWh7wQ9cMb2pqXaUp6bUZOMsIlu5aOlxGxgE/t6L/gPybybQGvdguajXGkZKSndZJpksA==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.15.0",
+        "@typescript-eslint/visitor-keys": "4.15.0",
+        "debug": "^4.1.1",
+        "globby": "^11.0.1",
+        "is-glob": "^4.0.1",
+        "semver": "^7.3.2",
+        "tsutils": "^3.17.1"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "@typescript-eslint/visitor-keys": {
+      "version": "4.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-4.15.0.tgz",
+      "integrity": "sha512-RnDtJwOwFucWFAMjG3ghCG/ikImFJFEg20DI7mn4pHEx3vC48lIAoyjhffvfHmErRDboUPC7p9Z2il4CLb7qxA==",
+      "dev": true,
+      "requires": {
+        "@typescript-eslint/types": "4.15.0",
+        "eslint-visitor-keys": "^2.0.0"
+      }
+    },
     "@webassemblyjs/ast": {
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.9.0.tgz",
@@ -630,6 +802,12 @@
       "integrity": "sha512-XNP0PqF1XD19ZlLKvB7cMmnZswW4C/03pRHgirB30uSJTaS3A3V1/P4sS3HPvFmjoriPCJQs+JDSbm4bL1TxGQ==",
       "dev": true
     },
+    "acorn-jsx": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.1.tgz",
+      "integrity": "sha512-K0Ptm/47OKfQRpNQ2J/oIN/3QYiK6FwW+eJbILhsdxh2WTLdl+30o8aGdTbm5JbffpFFAg/g+zi1E+jvJha5ng==",
+      "dev": true
+    },
     "ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
@@ -663,6 +841,12 @@
         "type-fest": "^0.11.0"
       }
     },
+    "ansi-regex": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+      "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+      "dev": true
+    },
     "ansi-styles": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
@@ -672,12 +856,33 @@
         "color-convert": "^1.9.0"
       }
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
     "array-back": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/array-back/-/array-back-4.0.1.tgz",
       "integrity": "sha512-Z/JnaVEXv+A9xabHzN43FiiiWEE7gPCRXMrVmRm00tWbjZRul1iHm7ECzlyNq1p4a4ATXz+G9FJ3GqGOkOV3fg==",
       "dev": true
     },
+    "array-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
+      "dev": true
+    },
+    "astral-regex": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-2.0.0.tgz",
+      "integrity": "sha512-Z7tMw1ytTXt5jqMcOP+OQteU1VuNK9Y02uuJtKQ1Sv69jXQKKg5cibLwGJow8yzZP+eAc18EmLGPal0bp36rvQ==",
+      "dev": true
+    },
     "axios": {
       "version": "0.21.1",
       "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.1.tgz",
@@ -686,12 +891,28 @@
         "follow-redirects": "^1.10.0"
       }
     },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
     "big.js": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",
       "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==",
       "dev": true
     },
+    "brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
     "braces": {
       "version": "3.0.2",
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@@ -719,6 +940,12 @@
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+          "requires": {
+            "color-convert": "^2.0.1"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
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+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+          "dev": true
+        }
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       "resolved": "https://registry.npmjs.org/source-list-map/-/source-list-map-2.0.1.tgz",
@@ -1826,6 +2644,23 @@
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+    "sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
+    },
+    "string-width": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
+      "integrity": "sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==",
+      "dev": true,
+      "requires": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.0"
+      }
+    },
     "string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -1835,12 +2670,27 @@
         "safe-buffer": "~5.1.0"
       }
     },
+    "strip-ansi": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
+      "integrity": "sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^5.0.0"
+      }
+    },
     "strip-final-newline": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
       "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
       "dev": true
     },
+    "strip-json-comments": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
+      "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
+      "dev": true
+    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
@@ -1850,6 +2700,38 @@
         "has-flag": "^3.0.0"
       }
     },
+    "table": {
+      "version": "6.0.7",
+      "resolved": "https://registry.npmjs.org/table/-/table-6.0.7.tgz",
+      "integrity": "sha512-rxZevLGTUzWna/qBLObOe16kB2RTnnbhciwgPbMMlazz1yZGVEgnZK762xyVdVznhqxrfCeBMmMkgOOaPwjH7g==",
+      "dev": true,
+      "requires": {
+        "ajv": "^7.0.2",
+        "lodash": "^4.17.20",
+        "slice-ansi": "^4.0.0",
+        "string-width": "^4.2.0"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "7.0.4",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-7.0.4.tgz",
+          "integrity": "sha512-xzzzaqgEQfmuhbhAoqjJ8T/1okb6gAzXn/eQRNpAN1AEUoHJTNF9xCDRTtf/s3SKldtZfa+RJeTs+BQq+eZ/sw==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^3.1.1",
+            "json-schema-traverse": "^1.0.0",
+            "require-from-string": "^2.0.2",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "json-schema-traverse": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
+          "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
+          "dev": true
+        }
+      }
+    },
     "table-layout": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/table-layout/-/table-layout-1.0.1.tgz",
@@ -1918,6 +2800,12 @@
         }
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "tiny-invariant": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/tiny-invariant/-/tiny-invariant-1.1.0.tgz",
@@ -1990,6 +2878,24 @@
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       "dev": true
     },
+    "tsutils": {
+      "version": "3.20.0",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.20.0.tgz",
+      "integrity": "sha512-RYbuQuvkhuqVeXweWT3tJLKOEJ/UUw9GjNEZGWdrLLlM+611o1gwLHBpxoFJKKl25fLprp2eVthtKs5JOrNeXg==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
+    "type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "^1.2.1"
+      }
+    },
     "type-fest": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
@@ -1997,9 +2903,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
-      "integrity": "sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==",
+      "version": "4.1.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.1.4.tgz",
+      "integrity": "sha512-+Uru0t8qIRgjuCpiSPpfGuhHecMllk5Zsazj5LZvVsEStEjmIRRBZe+jHjGQvsgS7M1wONy2PQXd67EMyV6acg==",
       "dev": true
     },
     "typical": {
@@ -2159,6 +3065,12 @@
         "isexe": "^2.0.0"
       }
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrapjs": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-4.0.0.tgz",
@@ -2174,6 +3086,12 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
+    },
+    "yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index 6365f673..84651aec 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "main": "index.js",
   "scripts": {
     "fmt": "prettier --write \"optuna_dashboard/static/**/*.{ts,tsx}\"",
-    "lint": "prettier --list-different \"optuna_dashboard/static/**/*.{ts,tsx}\"",
+    "lint": "eslint . --ext .ts,.tsx && prettier --list-different \"optuna_dashboard/static/**/*.{ts,tsx}\"",
     "watch": "webpack --watch",
     "build": "webpack",
     "build:dev": "NODE_ENV=development webpack",
@@ -31,9 +31,12 @@
     "@types/react": "^16.9.53",
     "@types/react-dom": "^16.9.8",
     "@types/react-router-dom": "^5.1.6",
+    "@typescript-eslint/eslint-plugin": "^4.15.0",
+    "@typescript-eslint/parser": "^4.15.0",
+    "eslint": "^7.19.0",
     "prettier": "^2.1.2",
     "ts-loader": "^8.0.6",
-    "typescript": "^4.0.3",
+    "typescript": "^4.1.4",
     "webpack": "^5.1.3",
     "webpack-cli": "^4.1.0"
   }