Upgrade dependencies feb 2026

.chronus/changes/upgrade-deps-feb-2026-2026-1-17-10-39-16.md

@@ -0,0 +1,38 @@
+---
+changeKind: dependencies
+packages:
+  - "@typespec/asset-emitter"
+  - "@typespec/bundler"
+  - "@typespec/compiler"
+  - "@typespec/eslint-plugin"
+  - "@typespec/events"
+  - "@typespec/html-program-viewer"
+  - "@typespec/http-canonicalization"
+  - "@typespec/http-client-js"
+  - "@typespec/http-client"
+  - "@typespec/http-server-csharp"
+  - "@typespec/http-server-js"
+  - "@typespec/http-specs"
+  - "@typespec/http"
+  - "@typespec/internal-build-utils"
+  - "@typespec/json-schema"
+  - "@typespec/library-linter"
+  - "@typespec/mutator-framework"
+  - "@typespec/openapi"
+  - "@typespec/openapi3"
+  - "@typespec/playground"
+  - "@typespec/protobuf"
+  - "@typespec/rest"
+  - "@typespec/spec-api"
+  - "@typespec/spec-coverage-sdk"
+  - "@typespec/spector"
+  - "@typespec/sse"
+  - "@typespec/streams"
+  - tmlanguage-generator
+  - "@typespec/tspd"
+  - typespec-vscode
+  - "@typespec/versioning"
+  - "@typespec/xml"
+---
+
+Bump dependencies

.chronus/changes/upgrade-deps-feb-2026-2026-1-17-11-28-2.md

@@ -0,0 +1,9 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/emitter-framework"
+  - "@typespec/http-client-java"
+  - "@typespec/http-client-python"
+---
+
+fix lint issues

.vscode/settings.json

@@ -57,5 +57,6 @@
   "typescript.tsdk": "./node_modules/typescript/lib",
   "git.ignoreLimitWarning": true,
   "vitest.rootConfig": "vitest.config.js",
+  "eslint.rules.customizations": [{ "rule": "*", "severity": "warn" }],
   "typespec.tsp-server.path": "${workspaceFolder}/packages/compiler"
 }

package.json

@@ -43,21 +43,21 @@
     "@chronus/chronus": "^1.0.1",
     "@chronus/github": "^1.0.1",
     "@chronus/github-pr-commenter": "^1.0.1",
-    "@eslint/js": "^9.39.2",
+    "@eslint/js": "^10.0.1",
     "@microsoft/api-extractor": "^7.55.2",
     "@octokit/core": "^7.0.2",
     "@octokit/plugin-paginate-graphql": "^6.0.0",
     "@octokit/plugin-rest-endpoint-methods": "^17.0.0",
     "@types/micromatch": "^4.0.9",
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@vitest/coverage-v8": "^4.0.15",
     "@vitest/eslint-plugin": "^1.5.2",
     "c8": "^10.1.3",
     "cspell": "^9.4.0",
-    "eslint": "^9.39.2",
+    "eslint": "^10.0.0",
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-react-hooks": "7.0.1",
-    "eslint-plugin-unicorn": "^62.0.0",
+    "eslint-plugin-unicorn": "^63.0.0",
     "micromatch": "^4.0.8",
     "picocolors": "~1.1.1",
     "playwright": "^1.57.0",
@@ -69,7 +69,7 @@
     "syncpack": "^13.0.3",
     "tsx": "^4.21.0",
     "typescript": "~5.9.2",
-    "typescript-eslint": "^8.49.0",
+    "typescript-eslint": "^8.56.0",
     "vite-plugin-node-polyfills": "^0.25.0",
     "vitest": "^4.0.15",
     "yaml": "~2.8.2"

packages/asset-emitter/package.json

@@ -45,7 +45,7 @@
     "@typespec/compiler": "workspace:^"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@typespec/compiler": "workspace:^",
     "@vitest/coverage-v8": "^4.0.15",
     "@vitest/ui": "^4.0.15",

packages/best-practices/package.json

@@ -44,7 +44,7 @@
     "@typespec/compiler": "workspace:^"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@typespec/compiler": "workspace:^",
     "@vitest/coverage-v8": "^4.0.15",
     "@vitest/ui": "^4.0.15",

packages/bundle-uploader/package.json

@@ -38,15 +38,15 @@
   ],
   "dependencies": {
     "@azure/identity": "~4.13.0",
-    "@azure/storage-blob": "~12.30.0",
+    "@azure/storage-blob": "~12.31.0",
     "@pnpm/workspace.find-packages": "^1000.0.24",
     "@typespec/bundler": "workspace:^",
     "json5": "^2.2.3",
     "picocolors": "~1.1.1",
     "semver": "^7.7.1"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@types/semver": "^7.5.8",
     "@vitest/coverage-v8": "^4.0.15",
     "@vitest/ui": "^4.0.15",

packages/bundler/package.json

@@ -50,7 +50,7 @@
     "yargs": "~18.0.0"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@types/yargs": "~17.0.33",
     "@vitest/coverage-v8": "^4.0.15",
     "@vitest/ui": "^4.0.15",

packages/compiler/package.json

@@ -105,11 +105,11 @@
     "lint:fix": "eslint . --fix"
   },
   "dependencies": {
-    "@babel/code-frame": "~7.28.6",
+    "@babel/code-frame": "~7.29.0",
     "@inquirer/prompts": "^8.0.1",
-    "ajv": "~8.17.1",
+    "ajv": "~8.18.0",
     "change-case": "~5.4.4",
-    "env-paths": "^3.0.0",
+    "env-paths": "^4.0.0",
     "globby": "~16.1.0",
     "is-unicode-supported": "^2.1.0",
     "mustache": "~4.2.0",
@@ -126,7 +126,7 @@
   "devDependencies": {
     "@types/babel__code-frame": "~7.27.0",
     "@types/mustache": "~4.2.5",
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@types/semver": "^7.5.8",
     "@types/yargs": "~17.0.33",
     "@typespec/internal-build-utils": "workspace:^",

packages/compiler/src/core/scanner.ts

@@ -1274,6 +1274,7 @@ export function createScanner(
       if (isCrlf(end - 2, 0, end)) {
         end--;
       }
+      // eslint-disable-next-line no-useless-assignment
       end--;
     }
 
@@ -1473,7 +1474,6 @@ export function createScanner(
 
   function scanIdentifierOrKeyword(): Token {
     let count = 0;
-    let ch = input.charCodeAt(position);
 
     while (true) {
       position++;
@@ -1483,7 +1483,7 @@ export function createScanner(
         break;
       }
 
-      ch = input.charCodeAt(position);
+      const ch = input.charCodeAt(position);
       if (count < KeywordLimit.MaxLength && isLowercaseAsciiLetter(ch)) {
         continue;
       }

packages/compiler/src/experimental/mutators.ts

@@ -421,11 +421,11 @@ function createMutatorEngine(
         continue;
       }
 
-      let mutationFn: MutatorFn<T> | null = null;
+      let mutationFn: MutatorFn<T> | null;
       let replaceFn: MutatorReplaceFn<T> | null = null;
 
-      let mutate = false;
-      let recurse = false;
+      let mutate;
+      let recurse;
 
       if (typeof record === "function") {
         mutationFn = record;

packages/compiler/src/server/server-compile-manager.ts

@@ -53,7 +53,7 @@ export class ServerCompileManager {
     compileOptions: CompilerOptions = {},
     serverCompileOptions: ServerCompileOptions,
   ): Promise<CompileTracker> {
-    let cache = undefined;
+    let cache;
     const curId = this.compileId++;
     const err = new Error();
     const lines = err.stack?.split("\n") ?? [];

packages/compiler/src/utils/fs-utils.ts

@@ -13,6 +13,7 @@ export async function mkTempDir(host: CompilerHost, base: string, prefix: string
     if ((error as any).code === `EACCES`) {
       throw new Error(
         `Cannot create temporary folder at ${path}. Permission denied. Please check your permissions.`,
+        { cause: error },
       );
     } else {
       throw error;

packages/compiler/test/checker/references.test.ts

@@ -570,6 +570,8 @@ describe("compiler: references", () => {
       }));
 
     describe("reference sibling members", () => {
+      // Those tests look broken https://github.com/microsoft/typespec/issues/9731
+      // eslint-disable-next-line no-unassigned-vars
       let linkedValue: Operation | undefined;
       beforeEach(() => {
         testHost.addJsFile("./test-link.js", {

packages/compiler/test/config/config.test.ts

@@ -112,6 +112,7 @@ describe("compiler: config file loading", () => {
     });
 
     it("deep clones defaults when not found", async () => {
+      // eslint-disable-next-line no-useless-assignment
       let config = await loadTestConfig("empty", false, false);
       config = await loadTestConfig("empty", false, false);
       deepStrictEqual(config, {
@@ -121,6 +122,7 @@ describe("compiler: config file loading", () => {
     });
 
     it("deep clones defaults when found", async () => {
+      // eslint-disable-next-line no-useless-assignment
       let config = await loadTestConfig("simple", false, false);
 
       config = await loadTestConfig("simple");

packages/emitter-framework/src/python/components/type-expression/type-expression.tsx

@@ -161,7 +161,7 @@ export function TypeExpression(props: TypeExpressionProps) {
     case "Operation": {
       // Render function types as typing.Callable[[ArgTypes...], ReturnType]
       // If parameters cannot be enumerated, fall back to Callable[..., ReturnType]
-      let paramTypes: Type[] | null = null;
+      let paramTypes: Type[] | null;
       const op: any = type as any;
       if (op.parameters) {
         try {
@@ -276,18 +276,19 @@ const pythonTypeToImport = new Map<string, any>([
 function getScalarIntrinsicExpression($: Typekit, type: Scalar | IntrinsicType): string | null {
   let intrinsicName: string;
   if ($.scalar.is(type)) {
-    if ($.scalar.isUtcDateTime(type) || $.scalar.extendsUtcDateTime(type)) {
-      const encoding = $.scalar.getEncoding(type);
-      intrinsicName = "utcDateTime";
-      switch (encoding?.encoding) {
-        case "unixTimestamp":
-        case "rfc7231":
-        case "rfc3339":
-        default:
-          intrinsicName = `utcDateTime`;
-          break;
-      }
-    }
+    // This was always is overridden below?
+    // if ($.scalar.isUtcDateTime(type) || $.scalar.extendsUtcDateTime(type)) {
+    //   const encoding = $.scalar.getEncoding(type);
+    //   intrinsicName = "utcDateTime";
+    //   switch (encoding?.encoding) {
+    //     case "unixTimestamp":
+    //     case "rfc7231":
+    //     case "rfc3339":
+    //     default:
+    //       intrinsicName = `utcDateTime`;
+    //       break;
+    //   }
+    // }
     intrinsicName = $.scalar.getStdBase(type)?.name ?? "";
   } else {
     intrinsicName = type.name;

packages/emitter-framework/src/typescript/components/type-expression.tsx

@@ -132,7 +132,7 @@ function getScalarIntrinsicExpression($: Typekit, type: Scalar | IntrinsicType):
   if ($.scalar.is(type)) {
     if ($.scalar.isUtcDateTime(type) || $.scalar.extendsUtcDateTime(type)) {
       const encoding = $.scalar.getEncoding(type);
-      let emittedType = "Date";
+      let emittedType;
       switch (encoding?.encoding) {
         case "unixTimestamp":
         case "rfc7231":

packages/eslint-plugin-typespec/package.json

@@ -37,17 +37,17 @@
     "!dist/test/**"
   ],
   "peerDependencies": {
-    "eslint": "^9.39.2"
+    "eslint": "^10.0.0"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@typescript-eslint/parser": "^8.49.0",
     "@typescript-eslint/rule-tester": "^8.49.0",
     "@typescript-eslint/types": "^8.49.0",
     "@vitest/coverage-v8": "^4.0.15",
     "@vitest/ui": "^4.0.15",
     "c8": "^10.1.3",
-    "eslint": "^9.39.2",
+    "eslint": "^10.0.0",
     "rimraf": "~6.1.2",
     "typescript": "~5.9.2",
     "vitest": "^4.0.15"

packages/events/package.json

@@ -56,7 +56,7 @@
     "@typespec/compiler": "workspace:^"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@typespec/compiler": "workspace:^",
     "@typespec/library-linter": "workspace:^",
     "@typespec/tspd": "workspace:^",

packages/html-program-viewer/package.json

@@ -51,7 +51,7 @@
     "@typespec/compiler": "workspace:^"
   },
   "dependencies": {
-    "@fluentui/react-components": "~9.72.3",
+    "@fluentui/react-components": "~9.73.0",
     "@fluentui/react-icons": "^2.0.292",
     "@fluentui/react-list": "^9.1.2",
     "react": "~19.2.3",
@@ -63,7 +63,7 @@
     "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^6.6.3",
     "@testing-library/react": "^16.2.0",
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "@types/react": "~19.2.7",
     "@types/react-dom": "~19.2.2",
     "@typespec/compiler": "workspace:^",

packages/http-canonicalization/package.json

@@ -39,7 +39,7 @@
     "@typespec/http": "workspace:^"
   },
   "devDependencies": {
-    "@types/node": "~25.0.2",
+    "@types/node": "~25.2.3",
     "concurrently": "^9.1.2",
     "prettier": "~3.8.0"
   }

packages/http-client-csharp/emitter/src/emitter.ts

@@ -124,7 +124,7 @@ export async function $onEmit(context: EmitContext<CSharpEmitterOptions>) {
       } catch (error: any) {
         const isValid = await _validateDotNetSdk(sdkContext, _minSupportedDotNetSdkVersion);
         // if the dotnet sdk is valid, the error is not dependency issue, log it as normal
-        if (isValid) throw new Error(error);
+        if (isValid) throw new Error(error, { cause: error });
       }
       if (!options["save-inputs"]) {
         // delete

packages/http-client-java/emitter/src/code-model-builder.ts

@@ -1879,6 +1879,8 @@ export class CodeModelBuilder {
 
         // group schema
 
+        // TODO: double check this suppression
+        // eslint-disable-next-line no-useless-assignment
         let coreNamespace = this.namespace;
         if (this.isAzureV1()) {
           coreNamespace = "com.azure.core.http";
@@ -2201,10 +2203,8 @@ export class CodeModelBuilder {
     // TODO: what to do if more than 1 response?
     // It happens when the response type is Union, on one status code.
     // let response: Response;
-    let headers: Array<HttpHeader> | undefined = undefined;
+    const headers: Array<HttpHeader> = [];
 
-    // headers
-    headers = [];
     if (sdkResponse.headers) {
       for (const header of sdkResponse.headers) {
         const schema = this.processSchema(header.type, header.name);

packages/http-client-js/eng/scripts/emit-e2e.js

@@ -205,7 +205,7 @@ async function processFile(file, options) {
         console.log(pc.yellow(`Skipping: ${relativePath}`));
       } else if (action === "abort") {
         console.log(pc.red("Aborting processing."));
-        throw new Error("Processing aborted by user");
+        throw new Error("Processing aborted by user", { cause: error });
       }
     }
     return { status: "failed", relativePath, errorDetails };

packages/http-client-js/package.json

@@ -66,7 +66,7 @@
     "@typespec/http": "workspace:^",
     "@typespec/http-specs": "workspace:^",
     "@typespec/spector": "workspace:^",
-    "@typespec/ts-http-runtime": "0.3.2",
+    "@typespec/ts-http-runtime": "0.3.3",
     "@typespec/tspd": "workspace:^",
     "@typespec/versioning": "workspace:^",
     "@vitest/ui": "^4.0.15",