diff --git a/packages/jaeger-ui-components/src/model/ddg/PathElem.test.js b/packages/jaeger-ui-components/src/model/ddg/PathElem.test.ts
similarity index 96%
rename from packages/jaeger-ui-components/src/model/ddg/PathElem.test.js
rename to packages/jaeger-ui-components/src/model/ddg/PathElem.test.ts
index e7eba0d49e3..2e835d09bc7 100644
--- a/packages/jaeger-ui-components/src/model/ddg/PathElem.test.js
+++ b/packages/jaeger-ui-components/src/model/ddg/PathElem.test.ts
@@ -14,12 +14,13 @@
 
 import PathElem from './PathElem';
 import { simplePath } from './sample-paths.test.resources';
+import { TDdgOperation, TDdgPath, TDdgService } from './types';
 
 describe('PathElem', () => {
   const getPath = () => {
     const path = {
       focalIdx: 2,
-    };
+    } as TDdgPath;
     const members = simplePath.map(
       ({ operation, service }, i) =>
         new PathElem({
@@ -28,8 +29,8 @@ describe('PathElem', () => {
             name: operation,
             service: {
               name: service,
-            },
-          },
+            } as TDdgService,
+          } as TDdgOperation,
           path,
         })
     );
@@ -42,13 +43,13 @@ describe('PathElem', () => {
     return path;
   };
   const testMemberIdx = 3;
-  const testOperation = {};
+  const testOperation = {} as TDdgOperation;
   const testPath = {
     focalIdx: 4,
     members: ['member0', 'member1', 'member2', 'member3', 'member4', 'member5'],
-  };
+  } as unknown as TDdgPath;
   const testVisibilityIdx = 105;
-  let pathElem;
+  let pathElem: PathElem;
 
   beforeEach(() => {
     pathElem = new PathElem({ path: testPath, operation: testOperation, memberIdx: testMemberIdx });
diff --git a/packages/jaeger-ui-components/src/model/ddg/__snapshots__/PathElem.test.js.snap b/packages/jaeger-ui-components/src/model/ddg/__snapshots__/PathElem.test.ts.snap
similarity index 100%
rename from packages/jaeger-ui-components/src/model/ddg/__snapshots__/PathElem.test.js.snap
rename to packages/jaeger-ui-components/src/model/ddg/__snapshots__/PathElem.test.ts.snap
diff --git a/packages/jaeger-ui-components/src/model/ddg/sample-paths.test.resources.js b/packages/jaeger-ui-components/src/model/ddg/sample-paths.test.resources.ts
similarity index 93%
rename from packages/jaeger-ui-components/src/model/ddg/sample-paths.test.resources.js
rename to packages/jaeger-ui-components/src/model/ddg/sample-paths.test.resources.ts
index b9dadfcaf1b..7bcd7a0f040 100644
--- a/packages/jaeger-ui-components/src/model/ddg/sample-paths.test.resources.js
+++ b/packages/jaeger-ui-components/src/model/ddg/sample-paths.test.resources.ts
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-export const simplePayloadElemMaker = (label) => ({
+export const simplePayloadElemMaker = (label: string) => ({
   operation: `${label}Operation`,
   service: `${label}Service`,
 });
@@ -24,9 +24,9 @@ const sameFocalServicePayloadElem = {
   service: focalPayloadElem.service,
 };
 
-const pathLengthener = (path) => {
-  const prequels = [];
-  const sequels = [];
+const pathLengthener = (path: Array<{ operation: string; service: string }>) => {
+  const prequels: Array<{ operation: string; service: string }> = [];
+  const sequels: Array<{ operation: string; service: string }> = [];
   path.forEach(({ operation, service }) => {
     if (operation !== focalPayloadElem.operation && service !== focalPayloadElem.service) {
       prequels.push({
@@ -115,7 +115,3 @@ export const generationPaths = [
   ],
   [generationPayloadElems.target, generationPayloadElems.beforeFocalMid, focalPayloadElem],
 ];
-
-export const wrap = (paths) => ({
-  dependencies: paths.map((path) => ({ path, attributes: [] })),
-});
diff --git a/packages/jaeger-ui-components/src/model/find-trace-name.test.js b/packages/jaeger-ui-components/src/model/find-trace-name.test.ts
similarity index 93%
rename from packages/jaeger-ui-components/src/model/find-trace-name.test.js
rename to packages/jaeger-ui-components/src/model/find-trace-name.test.ts
index 39c9653a528..bec8fefd8c3 100644
--- a/packages/jaeger-ui-components/src/model/find-trace-name.test.js
+++ b/packages/jaeger-ui-components/src/model/find-trace-name.test.ts
@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+import { TraceSpan } from '../types/trace';
+
 import { _getTraceNameImpl as getTraceName } from './trace-viewer';
 
 describe('getTraceName', () => {
@@ -223,22 +225,22 @@ describe('getTraceName', () => {
   const fullTraceName = `${serviceName}: ${operationName}`;
 
   it('returns an empty string if given spans with no root among them', () => {
-    expect(getTraceName(spansWithNoRoots)).toEqual('');
+    expect(getTraceName(spansWithNoRoots as TraceSpan[])).toEqual('');
   });
 
   it('returns an id of root span with the earliest startTime', () => {
-    expect(getTraceName(spansWithMultipleRootsDifferentByStartTime)).toEqual(fullTraceName);
+    expect(getTraceName(spansWithMultipleRootsDifferentByStartTime as TraceSpan[])).toEqual(fullTraceName);
   });
 
   it('returns an id of root span without any refs', () => {
-    expect(getTraceName(spansWithMultipleRootsWithOneWithoutRefs)).toEqual(fullTraceName);
+    expect(getTraceName(spansWithMultipleRootsWithOneWithoutRefs as unknown as TraceSpan[])).toEqual(fullTraceName);
   });
 
   it('returns an id of root span with remote ref', () => {
-    expect(getTraceName(spansWithOneRootWithRemoteRef)).toEqual(fullTraceName);
+    expect(getTraceName(spansWithOneRootWithRemoteRef as TraceSpan[])).toEqual(fullTraceName);
   });
 
   it('returns an id of root span with no refs', () => {
-    expect(getTraceName(spansWithOneRootWithNoRefs)).toEqual(fullTraceName);
+    expect(getTraceName(spansWithOneRootWithNoRefs as unknown as TraceSpan[])).toEqual(fullTraceName);
   });
 });
diff --git a/packages/jaeger-ui-components/src/model/link-patterns.test.js b/packages/jaeger-ui-components/src/model/link-patterns.test.ts
similarity index 93%
rename from packages/jaeger-ui-components/src/model/link-patterns.test.js
rename to packages/jaeger-ui-components/src/model/link-patterns.test.ts
index 22f5c13a047..0a6768febd9 100644
--- a/packages/jaeger-ui-components/src/model/link-patterns.test.js
+++ b/packages/jaeger-ui-components/src/model/link-patterns.test.ts
@@ -12,12 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+import { Trace, TraceLink, TraceSpan } from '../types/trace';
+
 import {
   processTemplate,
   createTestFunction,
   getParameterInArray,
   getParameterInAncestor,
   processLinkPattern,
+  ProcessedLinkPattern,
   computeLinks,
   createGetLinks,
   computeTraceLink,
@@ -64,7 +67,8 @@ describe('processTemplate()', () => {
     expect(() =>
       processTemplate(
         {
-          template: (data) => `a${data.b}c`,
+          /* eslint-disable @typescript-eslint/no-explicit-any */
+          template: (data: { [key: string]: any }) => `a${data.b}c`,
         },
         (a) => a
       )
@@ -243,21 +247,28 @@ describe('getParameterInAncestor()', () => {
       },
       tags: [{ key: 'a', value: 'a0' }],
     },
-  ];
+  ] as TraceSpan[];
+
   spans[1].references = [
     {
+      spanID: 's1',
+      traceID: 't2',
       refType: 'CHILD_OF',
       span: spans[0],
     },
   ];
   spans[2].references = [
     {
+      spanID: 's1',
+      traceID: 't2',
       refType: 'CHILD_OF',
       span: spans[0],
     },
   ];
   spans[3].references = [
     {
+      spanID: 's1',
+      traceID: 't2',
       refType: 'CHILD_OF',
       span: spans[2],
     },
@@ -311,7 +322,7 @@ describe('getParameterInAncestor()', () => {
         depth: 0,
         process: {},
       },
-    ];
+    ] as TraceSpan[];
     expect(getParameterInAncestor('a', spansWithUndefinedTags[0])).toBeUndefined();
   });
 });
@@ -328,7 +339,7 @@ describe('computeTraceLink()', () => {
       url: 'http://example.com/?myKey=#{traceID}&myKey=#{myKey}',
       text: 'second link (#{myKey})',
     },
-  ].map(processLinkPattern);
+  ].map(processLinkPattern) as ProcessedLinkPattern[];
 
   const trace = {
     processes: [],
@@ -338,7 +349,7 @@ describe('computeTraceLink()', () => {
     endTime: 2000,
     duration: 1000,
     services: [],
-  };
+  } as unknown as Trace;
 
   it('correctly computes links', () => {
     expect(computeTraceLink(linkPatterns, trace)).toEqual([
@@ -363,14 +374,16 @@ describe('computeLinks()', () => {
       url: 'http://example.com/?myKey=#{myOtherKey}&myKey=#{myKey}',
       text: 'second link (#{myOtherKey})',
     },
-  ].map(processLinkPattern);
+  ].map(processLinkPattern) as ProcessedLinkPattern[];
 
   const spans = [
     { depth: 0, process: {}, tags: [{ key: 'myKey', value: 'valueOfMyKey' }] },
     { depth: 1, process: {}, logs: [{ fields: [{ key: 'myOtherKey', value: 'valueOfMy+Other+Key' }] }] },
-  ];
+  ] as unknown as TraceSpan[];
   spans[1].references = [
     {
+      spanID: 's1',
+      traceID: 't2',
       refType: 'CHILD_OF',
       span: spans[0],
     },
@@ -399,12 +412,13 @@ describe('getLinks()', () => {
       url: 'http://example.com/?mySpecialKey=#{mySpecialKey}',
       text: 'special key link (#{mySpecialKey})',
     },
-  ].map(processLinkPattern);
-  const template = jest.spyOn(linkPatterns[0].url, 'template');
+  ].map(processLinkPattern) as ProcessedLinkPattern[];
+  const template = jest.spyOn(linkPatterns[0]!.url, 'template');
 
-  const span = { depth: 0, process: {}, tags: [{ key: 'mySpecialKey', value: 'valueOfMyKey' }] };
+  const span = { depth: 0, process: {}, tags: [{ key: 'mySpecialKey', value: 'valueOfMyKey' }] } as TraceSpan;
 
-  let cache;
+  /* eslint-disable @typescript-eslint/no-explicit-any */
+  let cache: WeakMap<object, any>;
 
   beforeEach(() => {
     cache = new WeakMap();
@@ -419,7 +433,7 @@ describe('getLinks()', () => {
   });
 
   it('returns the result from the cache', () => {
-    const result = [];
+    const result: TraceLink[] = [];
     cache.set(span.tags[0], result);
     const getLinks = createGetLinks(linkPatterns, cache);
     expect(getLinks(span, span.tags, 0)).toBe(result);
diff --git a/packages/jaeger-ui-components/src/model/link-patterns.tsx b/packages/jaeger-ui-components/src/model/link-patterns.tsx
index d0d47a676a1..9f74ccb532f 100644
--- a/packages/jaeger-ui-components/src/model/link-patterns.tsx
+++ b/packages/jaeger-ui-components/src/model/link-patterns.tsx
@@ -28,7 +28,7 @@ type ProcessedTemplate = {
   template: (template: { [key: string]: any }) => string;
 };
 
-type ProcessedLinkPattern = {
+export type ProcessedLinkPattern = {
   object: any;
   type: (link: string) => boolean;
   key: (link: string) => boolean;
@@ -74,7 +74,7 @@ export function processTemplate(template: unknown, encodeFn: (unencoded: any) =>
   };
 }
 
-export function createTestFunction(entry: any) {
+export function createTestFunction(entry?: any) {
   if (typeof entry === 'string') {
     return (arg: unknown) => arg === entry;
   }
@@ -100,7 +100,7 @@ export function createTestFunction(entry: any) {
 
 const identity = (a: any): typeof a => a;
 
-export function processLinkPattern(pattern: any): ProcessedLinkPattern | TNil {
+export function processLinkPattern(pattern: any): ProcessedLinkPattern | null {
   try {
     const url = processTemplate(pattern.url, encodeURIComponent);
     const text = processTemplate(pattern.text, identity);
@@ -120,7 +120,7 @@ export function processLinkPattern(pattern: any): ProcessedLinkPattern | TNil {
   }
 }
 
-export function getParameterInArray(name: string, array: TraceKeyValuePair[]) {
+export function getParameterInArray(name: string, array?: TraceKeyValuePair[] | TNil) {
   if (array) {
     return array.find((entry) => entry.key === name);
   }
@@ -150,10 +150,10 @@ export function computeTraceLink(linkPatterns: ProcessedLinkPattern[], trace: Tr
   );
 
   linkPatterns
-    .filter((pattern) => pattern.type('traces'))
+    ?.filter((pattern) => pattern?.type('traces'))
     .forEach((pattern) => {
       const parameterValues: Record<string, any> = {};
-      const allParameters = pattern.parameters.every((parameter) => {
+      const allParameters = pattern?.parameters.every((parameter) => {
         const key = parameter as keyof Trace;
         if (validKeys.includes(key)) {
           // At this point is safe to access to trace object using parameter variable because
diff --git a/packages/jaeger-ui-components/src/model/transform-trace-data.test.js b/packages/jaeger-ui-components/src/model/transform-trace-data.test.ts
similarity index 91%
rename from packages/jaeger-ui-components/src/model/transform-trace-data.test.js
rename to packages/jaeger-ui-components/src/model/transform-trace-data.test.ts
index 8dfa857fdcf..0a73c00d943 100644
--- a/packages/jaeger-ui-components/src/model/transform-trace-data.test.js
+++ b/packages/jaeger-ui-components/src/model/transform-trace-data.test.ts
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+import { TraceResponse } from '../types/trace';
 
 import transformTraceData, { orderTags, deduplicateTags } from './transform-trace-data';
 
@@ -136,7 +137,7 @@ describe('transformTraceData()', () => {
       traceID: undefined,
       processes,
       spans,
-    };
+    } as unknown as TraceResponse;
 
     expect(transformTraceData(traceData)).toEqual(null);
   });
@@ -146,9 +147,9 @@ describe('transformTraceData()', () => {
       traceID,
       processes,
       spans: [...spans, rootSpanWithMissingRef],
-    };
+    } as unknown as TraceResponse;
 
-    expect(transformTraceData(traceData).traceName).toEqual(`${serviceName}: ${rootOperationName}`);
+    expect(transformTraceData(traceData)!.traceName).toEqual(`${serviceName}: ${rootOperationName}`);
   });
 
   it('should return trace data with correct traceName based on root span without any refs', () => {
@@ -156,8 +157,8 @@ describe('transformTraceData()', () => {
       traceID,
       processes,
       spans: [...spans, rootSpanWithoutRefs],
-    };
+    } as unknown as TraceResponse;
 
-    expect(transformTraceData(traceData).traceName).toEqual(`${serviceName}: ${rootOperationName}`);
+    expect(transformTraceData(traceData)!.traceName).toEqual(`${serviceName}: ${rootOperationName}`);
   });
 });