diff --git a/web_src/js/components/DashboardRepoList.vue b/web_src/js/components/DashboardRepoList.vue
index 3d3ac2fc69..41793d60ed 100644
--- a/web_src/js/components/DashboardRepoList.vue
+++ b/web_src/js/components/DashboardRepoList.vue
@@ -6,8 +6,17 @@ import {fomanticQuery} from '../modules/fomantic/base.ts';
 
 const {appSubUrl, assetUrlPrefix, pageData} = window.config;
 
+type CommitStatus = 'pending' | 'success' | 'error' | 'failure' | 'warning';
+
+type CommitStatusMap = {
+  [status in CommitStatus]: {
+    name: string,
+    color: string,
+  };
+};
+
 // make sure this matches templates/repo/commit_status.tmpl
-const commitStatus = {
+const commitStatus: CommitStatusMap = {
   pending: {name: 'octicon-dot-fill', color: 'yellow'},
   success: {name: 'octicon-check', color: 'green'},
   error: {name: 'gitea-exclamation', color: 'red'},
@@ -281,18 +290,18 @@ const sfc = {
       return 'octicon-repo';
     },
 
-    statusIcon(status) {
+    statusIcon(status: CommitStatus) {
       return commitStatus[status].name;
     },
 
-    statusColor(status) {
+    statusColor(status: CommitStatus) {
       return commitStatus[status].color;
     },
 
     reposFilterKeyControl(e) {
       switch (e.key) {
         case 'Enter':
-          document.querySelector('.repo-owner-name-list li.active a')?.click();
+          document.querySelector<HTMLAnchorElement>('.repo-owner-name-list li.active a')?.click();
           break;
         case 'ArrowUp':
           if (this.activeIndex > 0) {
diff --git a/web_src/js/components/DiffCommitSelector.vue b/web_src/js/components/DiffCommitSelector.vue
index c78531cf9f..3a394955ca 100644
--- a/web_src/js/components/DiffCommitSelector.vue
+++ b/web_src/js/components/DiffCommitSelector.vue
@@ -14,7 +14,7 @@ export default {
       issueLink: el.getAttribute('data-issuelink'),
       locale: {
         filter_changes_by_commit: el.getAttribute('data-filter_changes_by_commit'),
-      },
+      } as Record<string, string>,
       commits: [],
       hoverActivated: false,
       lastReviewCommitSha: null,
@@ -41,16 +41,16 @@ export default {
     this.$el.removeEventListener('keyup', this.onKeyUp);
   },
   methods: {
-    onBodyClick(event) {
+    onBodyClick(event: MouseEvent) {
       // close this menu on click outside of this element when the dropdown is currently visible opened
       if (this.$el.contains(event.target)) return;
       if (this.menuVisible) {
         this.toggleMenu();
       }
     },
-    onKeyDown(event) {
+    onKeyDown(event: KeyboardEvent) {
       if (!this.menuVisible) return;
-      const item = document.activeElement;
+      const item = document.activeElement as HTMLElement;
       if (!this.$el.contains(item)) return;
       switch (event.key) {
         case 'ArrowDown': // select next element
@@ -73,7 +73,7 @@ export default {
         if (commitIdx) this.highlight(this.commits[commitIdx]);
       }
     },
-    onKeyUp(event) {
+    onKeyUp(event: KeyboardEvent) {
       if (!this.menuVisible) return;
       const item = document.activeElement;
       if (!this.$el.contains(item)) return;
@@ -95,7 +95,7 @@ export default {
       }
     },
     /** Focus given element */
-    focusElem(elem, prevElem) {
+    focusElem(elem: HTMLElement, prevElem: HTMLElement) {
       if (elem) {
         elem.tabIndex = 0;
         if (prevElem) prevElem.tabIndex = -1;
@@ -149,7 +149,7 @@ export default {
       window.location.assign(`${this.issueLink}/files/${this.lastReviewCommitSha}..${this.commits.at(-1).id}${this.queryParams}`);
     },
     /** Clicking on a single commit opens this specific commit */
-    commitClicked(commitId, newWindow = false) {
+    commitClicked(commitId: string, newWindow = false) {
       const url = `${this.issueLink}/commits/${commitId}${this.queryParams}`;
       if (newWindow) {
         window.open(url);
diff --git a/web_src/js/components/RepoCodeFrequency.vue b/web_src/js/components/RepoCodeFrequency.vue
index eaff8ae0af..7696996cf6 100644
--- a/web_src/js/components/RepoCodeFrequency.vue
+++ b/web_src/js/components/RepoCodeFrequency.vue
@@ -8,6 +8,8 @@ import {
   PointElement,
   LineElement,
   Filler,
+  type ChartOptions,
+  type ChartData,
 } from 'chart.js';
 import {GET} from '../modules/fetch.ts';
 import {Line as ChartLine} from 'vue-chartjs';
@@ -16,6 +18,7 @@ import {
   firstStartDateAfterDate,
   fillEmptyStartDaysWithZeroes,
   type DayData,
+  type DayDataObject,
 } from '../utils/time.ts';
 import {chartJsColors} from '../utils/color.ts';
 import {sleep} from '../utils.ts';
@@ -64,12 +67,12 @@ async function fetchGraphData() {
       }
     } while (response.status === 202);
     if (response.ok) {
-      data.value = await response.json();
-      const weekValues = Object.values(data.value);
+      const dayDataObject: DayDataObject = await response.json();
+      const weekValues = Object.values(dayDataObject);
       const start = weekValues[0].week;
       const end = firstStartDateAfterDate(new Date());
       const startDays = startDaysBetween(start, end);
-      data.value = fillEmptyStartDaysWithZeroes(startDays, data.value);
+      data.value = fillEmptyStartDaysWithZeroes(startDays, dayDataObject);
       errorText.value = '';
     } else {
       errorText.value = response.statusText;
@@ -81,7 +84,7 @@ async function fetchGraphData() {
   }
 }
 
-function toGraphData(data) {
+function toGraphData(data: Array<Record<string, any>>): ChartData<'line'> {
   return {
     datasets: [
       {
@@ -108,10 +111,9 @@ function toGraphData(data) {
   };
 }
 
-const options = {
+const options: ChartOptions<'line'> = {
   responsive: true,
   maintainAspectRatio: false,
-  animation: true,
   plugins: {
     legend: {
       display: true,
diff --git a/web_src/js/components/RepoContributors.vue b/web_src/js/components/RepoContributors.vue
index f42278ef6b..97678b9a13 100644
--- a/web_src/js/components/RepoContributors.vue
+++ b/web_src/js/components/RepoContributors.vue
@@ -9,6 +9,9 @@ import {
   PointElement,
   LineElement,
   Filler,
+  type ChartOptions,
+  type ChartData,
+  type Plugin,
 } from 'chart.js';
 import {GET} from '../modules/fetch.ts';
 import zoomPlugin from 'chartjs-plugin-zoom';
@@ -22,8 +25,9 @@ import {chartJsColors} from '../utils/color.ts';
 import {sleep} from '../utils.ts';
 import 'chartjs-adapter-dayjs-4/dist/chartjs-adapter-dayjs-4.esm';
 import {fomanticQuery} from '../modules/fomantic/base.ts';
+import type {Entries} from 'type-fest';
 
-const customEventListener = {
+const customEventListener: Plugin = {
   id: 'customEventListener',
   afterEvent: (chart, args, opts) => {
     // event will be replayed from chart.update when reset zoom,
@@ -65,10 +69,10 @@ export default {
   data: () => ({
     isLoading: false,
     errorText: '',
-    totalStats: {},
-    sortedContributors: {},
+    totalStats: {} as Record<string, any>,
+    sortedContributors: {} as Record<string, any>,
     type: 'commits',
-    contributorsStats: [],
+    contributorsStats: {} as Record<string, any>,
     xAxisStart: null,
     xAxisEnd: null,
     xAxisMin: null,
@@ -99,7 +103,7 @@ export default {
     async fetchGraphData() {
       this.isLoading = true;
       try {
-        let response;
+        let response: Response;
         do {
           response = await GET(`${this.repoLink}/activity/contributors/data`);
           if (response.status === 202) {
@@ -112,7 +116,7 @@ export default {
           // below line might be deleted if we are sure go produces map always sorted by keys
           total.weeks = Object.fromEntries(Object.entries(total.weeks).sort());
 
-          const weekValues = Object.values(total.weeks);
+          const weekValues = Object.values(total.weeks) as any;
           this.xAxisStart = weekValues[0].week;
           this.xAxisEnd = firstStartDateAfterDate(new Date());
           const startDays = startDaysBetween(this.xAxisStart, this.xAxisEnd);
@@ -120,7 +124,7 @@ export default {
           this.xAxisMin = this.xAxisStart;
           this.xAxisMax = this.xAxisEnd;
           this.contributorsStats = {};
-          for (const [email, user] of Object.entries(rest)) {
+          for (const [email, user] of Object.entries(rest) as Entries<Record<string, Record<string, any>>>) {
             user.weeks = fillEmptyStartDaysWithZeroes(startDays, user.weeks);
             this.contributorsStats[email] = user;
           }
@@ -146,7 +150,7 @@ export default {
         user.total_additions = 0;
         user.total_deletions = 0;
         user.max_contribution_type = 0;
-        const filteredWeeks = user.weeks.filter((week) => {
+        const filteredWeeks = user.weeks.filter((week: Record<string, number>) => {
           const oneWeek = 7 * 24 * 60 * 60 * 1000;
           if (week.week >= this.xAxisMin - oneWeek && week.week <= this.xAxisMax + oneWeek) {
             user.total_commits += week.commits;
@@ -195,7 +199,7 @@ export default {
       return (1 - (coefficient % 1)) * 10 ** exp + maxValue;
     },
 
-    toGraphData(data) {
+    toGraphData(data: Array<Record<string, any>>): ChartData<'line'> {
       return {
         datasets: [
           {
@@ -211,9 +215,9 @@ export default {
       };
     },
 
-    updateOtherCharts(event, reset) {
-      const minVal = event.chart.options.scales.x.min;
-      const maxVal = event.chart.options.scales.x.max;
+    updateOtherCharts({chart}: {chart: Chart}, reset?: boolean = false) {
+      const minVal = chart.options.scales.x.min;
+      const maxVal = chart.options.scales.x.max;
       if (reset) {
         this.xAxisMin = this.xAxisStart;
         this.xAxisMax = this.xAxisEnd;
@@ -225,7 +229,7 @@ export default {
       }
     },
 
-    getOptions(type) {
+    getOptions(type: string): ChartOptions<'line'> {
       return {
         responsive: true,
         maintainAspectRatio: false,
@@ -238,6 +242,7 @@ export default {
             position: 'top',
             align: 'center',
           },
+          // @ts-expect-error: bug in chart.js types
           customEventListener: {
             chartType: type,
             instance: this,
diff --git a/web_src/js/components/RepoRecentCommits.vue b/web_src/js/components/RepoRecentCommits.vue
index 8d2a14cd2c..10e1fdd70c 100644
--- a/web_src/js/components/RepoRecentCommits.vue
+++ b/web_src/js/components/RepoRecentCommits.vue
@@ -7,6 +7,7 @@ import {
   LinearScale,
   TimeScale,
   type ChartOptions,
+  type ChartData,
 } from 'chart.js';
 import {GET} from '../modules/fetch.ts';
 import {Bar} from 'vue-chartjs';
@@ -15,6 +16,7 @@ import {
   firstStartDateAfterDate,
   fillEmptyStartDaysWithZeroes,
   type DayData,
+  type DayDataObject,
 } from '../utils/time.ts';
 import {chartJsColors} from '../utils/color.ts';
 import {sleep} from '../utils.ts';
@@ -61,11 +63,11 @@ async function fetchGraphData() {
       }
     } while (response.status === 202);
     if (response.ok) {
-      const data = await response.json();
-      const start = Object.values(data)[0].week;
+      const dayDataObj: DayDataObject = await response.json();
+      const start = Object.values(dayDataObj)[0].week;
       const end = firstStartDateAfterDate(new Date());
       const startDays = startDaysBetween(start, end);
-      data.value = fillEmptyStartDaysWithZeroes(startDays, data).slice(-52);
+      data.value = fillEmptyStartDaysWithZeroes(startDays, dayDataObj).slice(-52);
       errorText.value = '';
     } else {
       errorText.value = response.statusText;
@@ -77,10 +79,11 @@ async function fetchGraphData() {
   }
 }
 
-function toGraphData(data) {
+function toGraphData(data: DayData[]): ChartData<'bar'> {
   return {
     datasets: [
       {
+        // @ts-expect-error -- bar chart expects one-dimensional data, but apparently x/y still works
         data: data.map((i) => ({x: i.week, y: i.commits})),
         label: 'Commits',
         backgroundColor: chartJsColors['commits'],
@@ -91,10 +94,9 @@ function toGraphData(data) {
   };
 }
 
-const options = {
+const options: ChartOptions<'bar'> = {
   responsive: true,
   maintainAspectRatio: false,
-  animation: true,
   scales: {
     x: {
       type: 'time',
diff --git a/web_src/js/utils/time.ts b/web_src/js/utils/time.ts
index c661155442..6951ebfedb 100644
--- a/web_src/js/utils/time.ts
+++ b/web_src/js/utils/time.ts
@@ -49,7 +49,11 @@ export type DayData = {
   commits: number,
 }
 
-export function fillEmptyStartDaysWithZeroes(startDays: number[], data: DayData[]): DayData[] {
+export type DayDataObject = {
+  [timestamp: string]: DayData,
+}
+
+export function fillEmptyStartDaysWithZeroes(startDays: number[], data: DayDataObject): DayData[] {
   const result = {};
 
   for (const startDay of startDays) {