H-6787: Update to TypeScript 7

.yarnrc.yml

@@ -30,18 +30,30 @@ npmPreapprovedPackages:
   - "@earendil-works/[email protected]"
   - "@earendil-works/[email protected]"
 
-# Native tool input public declarations in the pinned local runtime patch.
-# Patch manifest edits alone do not add dependencies during Yarn resolution.
 packageExtensions:
+  # Pass the checker's compiler through to Volar instead of resolving native TS7.
+  "@astrojs/[email protected]":
+    peerDependencies:
+      typescript: "^5.0.0 || ^6.0.0"
+  # Dependency analysis and its public types require the JavaScript compiler API.
+  "[email protected]":
+    dependencies:
+      typescript: "6.0.3"
+  # Native tool input public declarations in the pinned local runtime patch.
+  # Patch manifest edits alone do not add dependencies during Yarn resolution.
   "@flue/[email protected]":
     dependencies:
       "@standard-schema/spec": "1.1.0"
 
 catalog:
   tsx: "4.20.6"
-  typescript: "6.0.3"
+  typescript: "7.0.2"
   "@typescript/typescript6": "6.0.2"
   vite: "8.2.2"
   vitest: "4.1.11"
   "@tsconfig/bases": "1.0.28"
   "@types/node": "22.18.13"
+
+catalogs:
+  typescript6:
+    typescript: "6.0.3"

apps/brunch-agent/package.json

@@ -15,7 +15,7 @@
     "dev": "vite dev",
     "fix:eslint": "oxlint --fix --type-aware --type-check --report-unused-disable-directives-severity=error .",
     "lint:eslint": "oxlint --type-aware --type-check --report-unused-disable-directives-severity=error .",
-    "lint:tsc": "tsgo --noEmit",
+    "lint:tsc": "tsc --noEmit",
     "persona": "node --experimental-strip-types evals/petrinaut/persona/launch.ts",
     "petrinaut:dev": "vite dev --config petrinaut-local.vite.config.ts",
     "probe:turn": "node --experimental-strip-types evals/petrinaut/turn-probe.ts",
@@ -60,12 +60,12 @@
     "@types/pg": "8.23.1",
     "@types/react": "19.2.14",
     "@types/react-dom": "19.2.3",
-    "@typescript/native-preview": "7.0.0-dev.20260511.1",
     "@valibot/to-json-schema": "1.7.1",
     "ai": "6.0.286",
     "dependency-cruiser": "18.0.0",
     "oxlint": "1.86.0",
     "oxlint-tsgolint": "7.0.2003",
+    "typescript": "catalog:",
     "vite": "catalog:",
     "vitest": "catalog:",
     "wait-on": "9.0.1"

apps/hash-ai-worker-ts/scripts/flow-scenarios/run-flow-scenario.ts

@@ -318,17 +318,14 @@ const ensureFlowDefinitionEntity = async ({
   const properties = mapFlowDefinitionToEntityProperties(flowDefinition);
 
   const existingEntity = await getFlowDefinitionEntityById({
-    flowDefinitionEntityId: entityIdFromComponents(
-      userId as WebId,
-      flowDefinitionId,
-    ),
+    flowDefinitionEntityId: entityIdFromComponents(userId, flowDefinitionId),
     graphApiClient: graphApi,
     userAuthentication: authentication,
   });
 
   if (!existingEntity) {
     await HashEntity.create<FlowDefinitionEntity>(graphApi, authentication, {
-      webId: userId as WebId,
+      webId: userId,
       entityUuid: flowDefinitionId,
       entityTypeIds,
       properties,
@@ -421,7 +418,7 @@ const seedEntities = async ({
 
   for (const [index, { entityTypeId, properties }] of entities.entries()) {
     await HashEntity.create(graphApi, authentication, {
-      webId: userId as WebId,
+      webId: userId,
       entityTypeIds: [entityTypeId],
       properties: mergePropertyObjectAndMetadata(properties, undefined),
       provenance: { actorType: "user", origin: { type: "api" } },
@@ -646,7 +643,7 @@ const describeWorkflowError = (error: unknown) => {
 
   while (current?.cause) {
     activityType = current.activityType ?? activityType;
-    current = current.cause as typeof current;
+    current = current.cause;
   }
 
   return `${activityType ? `\`${activityType}\` failed: ` : ""}${current?.message ?? "unknown error"}`;
@@ -909,15 +906,12 @@ const main = async () => {
     const workflowError = await workflowErrorWhenClosed;
 
     const flowRun = await getFlowRunFromTemporalWorkflowId({
-      flowDefinitionEntityId: entityIdFromComponents(
-        userId as WebId,
-        flowDefinitionId,
-      ),
-      flowRunEntityId: entityIdFromComponents(userId as WebId, workflowId),
+      flowDefinitionEntityId: entityIdFromComponents(userId, flowDefinitionId),
+      flowRunEntityId: entityIdFromComponents(userId, workflowId),
       name: flowDefinition.name,
       temporalClient: client,
       temporalWorkflowId: workflowId,
-      webId: userId as WebId,
+      webId: userId,
       storageProvider: getStorageProvider(),
     });
 

apps/hash-ai-worker-ts/src/activities/flow-activities/aggregate-action.test.ts

@@ -172,7 +172,7 @@ describe("aggregateAction", () => {
       "00000000-0000-4000-8000-000000000001~00000000-0000-4000-8000-000000000011" as EntityId;
     vi.mocked(queryEntities).mockResolvedValueOnce({
       entities: [],
-    } as unknown as QueryEntitiesResponse);
+    });
 
     expect(
       await run({ kind: "EntityId", value: [entityId] }, scoreSum),

apps/hash-ai-worker-ts/src/activities/flow-activities/filter-list-action.test.ts

@@ -141,7 +141,7 @@ describe("filterListAction", () => {
           recordId: { entityId },
           entityTypeIds: [
             index === 1
-              ? ("https://example.com/types/entity-type/person/v/1" as VersionedUrl)
+              ? "https://example.com/types/entity-type/person/v/1"
               : companyType,
           ],
         },
@@ -203,6 +203,7 @@ describe("filterListAction", () => {
     const result = await run(
       {
         kind: "EntityId",
+        // eslint-disable-next-line @typescript-eslint/no-unnecessary-type-assertion -- These malformed fixtures still need EntityId branding despite other Payload variants accepting strings.
         value: [validEntityId, "" as EntityId, "not-an-entity-id" as EntityId],
       },
       isCompany,
@@ -467,7 +468,7 @@ describe("filterListAction", () => {
   it("reports an entity the user can't read as not found", async () => {
     vi.mocked(queryEntities).mockResolvedValueOnce({
       entities: [],
-    } as unknown as QueryEntitiesResponse);
+    });
 
     expect(
       await run({ kind: "EntityId", value: [validEntityId] }, isCompany),

apps/hash-ai-worker-ts/src/activities/flow-activities/find-action.test.ts

@@ -18,7 +18,6 @@ import type {
   VersionedUrl,
 } from "@blockprotocol/type-system";
 import type { FileStorageProvider } from "@local/hash-backend-utils/file-storage";
-import type { QueryEntitiesResponse } from "@local/hash-graph-sdk/entity";
 import type { FilterCondition } from "@local/hash-isomorphic-utils/flows/filter-condition";
 import type {
   Payload,
@@ -224,7 +223,7 @@ describe("findAction", () => {
       "00000000-0000-4000-8000-000000000001~00000000-0000-4000-8000-000000000011" as EntityId;
     vi.mocked(queryEntities).mockResolvedValueOnce({
       entities: [],
-    } as unknown as QueryEntitiesResponse);
+    });
 
     expect(
       await run(
@@ -238,8 +237,7 @@ describe("findAction", () => {
               operator: "isOfType",
               value: {
                 kind: "VersionedUrl",
-                value:
-                  "https://example.com/types/entity-type/company/v/1" as VersionedUrl,
+                value: "https://example.com/types/entity-type/company/v/1",
               },
             },
           ],

apps/hash-ai-worker-ts/src/activities/flow-activities/generate-chart-config-action.ts

@@ -94,10 +94,7 @@ const tools: LlmToolDefinition<ToolName>[] = [
      * string rather than an object — parse it before schema validation.
      */
     sanitizeInputBeforeValidation: (rawInput) => {
-      if (
-        "config" in rawInput &&
-        typeof (rawInput as { config: unknown }).config === "string"
-      ) {
+      if ("config" in rawInput && typeof rawInput.config === "string") {
         return {
           ...rawInput,
           config: JSON.parse(
@@ -332,7 +329,7 @@ export const generateChartConfigAction: FlowActionActivity<
                   Array.isArray(parsedChartData) &&
                   parsedChartData.length > 0 &&
                   parsedChartData[0]
-                    ? Object.keys(parsedChartData[0] as object).join(", ")
+                    ? Object.keys(parsedChartData[0]).join(", ")
                     : "unknown"
                 }
 

apps/hash-ai-worker-ts/src/activities/flow-activities/generate-structural-query-action.ts

@@ -560,7 +560,7 @@ const tools: LlmToolDefinition<ToolName>[] = [
       },
       required: ["filter"],
       additionalProperties: false,
-      $defs: filterSchemaDefinitions as Record<string, unknown>,
+      $defs: filterSchemaDefinitions,
     },
   },
   {
@@ -598,7 +598,7 @@ const tools: LlmToolDefinition<ToolName>[] = [
       },
       required: ["filter", "explanation", "suggestedChartTypes"],
       additionalProperties: false,
-      $defs: filterSchemaDefinitions as Record<string, unknown>,
+      $defs: filterSchemaDefinitions,
     },
   },
 ];

apps/hash-ai-worker-ts/src/activities/flow-activities/order-by-action.test.ts

@@ -146,7 +146,7 @@ describe("orderByAction", () => {
       "00000000-0000-4000-8000-000000000001~00000000-0000-4000-8000-000000000011" as EntityId;
     vi.mocked(queryEntities).mockResolvedValueOnce({
       entities: [],
-    } as unknown as QueryEntitiesResponse);
+    });
 
     expect(await run({ kind: "EntityId", value: [entityId] }, byScore)).toEqual(
       {

apps/hash-ai-worker-ts/src/activities/flow-activities/write-google-sheet-action/convert-subgraph-to-sheet-requests.ts

@@ -106,7 +106,7 @@ const createColumnsForEntity = (
 
   for (const { schema } of entityTypeAndParents) {
     for (const baseUrl of typedKeys(schema.properties)) {
-      properties.add(baseUrl as BaseUrl);
+      properties.add(baseUrl);
     }
     for (const linkTypeId of typedKeys(schema.links ?? {})) {
       links.add(linkTypeId);

apps/hash-ai-worker-ts/src/activities/shared/get-llm-response/get-openai-reponse.ts

@@ -55,7 +55,7 @@ const mapLlmToolDefinitionToOpenAiToolDefinition = (
      */
     strict: false,
     name: tool.name,
-    parameters: tool.inputSchema as OpenAI.FunctionParameters,
+    parameters: tool.inputSchema,
     description: tool.description,
   },
 });

apps/hash-ai-worker-ts/src/activities/shared/get-llm-response/llm-message.ts

@@ -395,7 +395,7 @@ export const mapOpenAiMessagesToLlmMessages = (params: {
             {
               role: "user",
               content: [toolResultContent],
-            } as LlmUserMessage,
+            },
           ];
         }
 

apps/hash-ai-worker-ts/src/shared/testing-utilities/mock-get-flow-context.ts

@@ -137,7 +137,7 @@ vi.mock("@local/hash-backend-utils/temporal", async (importOriginal) => {
                 },
               },
               flowDefinitionEntityId: entityIdFromComponents(
-                aliceUserAccountId as WebId,
+                aliceUserAccountId,
                 generateUuid() as EntityUuid,
               ),
               flowInputs: {},

apps/hash-api/src/analysis/analyses/dashboards.test.ts

@@ -9,7 +9,6 @@ import {
 import type {
   ActorEntityUuid,
   MachineId,
-  RoleName,
   WebId,
 } from "@blockprotocol/type-system";
 import type { FileStorageProvider } from "@local/hash-backend-utils/file-storage";
@@ -177,7 +176,7 @@ describe("dashboardItemData analysis", () => {
     registerAnalyses(dashboardAnalyses);
 
     mockedGetRole.mockReset();
-    mockedGetRole.mockResolvedValue("member" as RoleName);
+    mockedGetRole.mockResolvedValue("member");
 
     mockedGetWebMachineId.mockReset();
     mockedGetWebMachineId.mockResolvedValue(WEB_MACHINE_ID);
@@ -209,7 +208,7 @@ describe("dashboardItemData analysis", () => {
   it("errors when the item does not exist in the web", async () => {
     mockedQueryEntities.mockResolvedValue({
       entities: [],
-    } as unknown as Awaited<ReturnType<typeof queryEntities>>);
+    });
 
     const result = await resolve({ itemUuid: ITEM_UUID });
     expect(result.status).toBe("error");

apps/hash-api/src/analysis/setup-analysis-handler/resolve-analysis.test.ts

@@ -1,10 +1,6 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
 
-import type {
-  ActorEntityUuid,
-  RoleName,
-  WebId,
-} from "@blockprotocol/type-system";
+import type { ActorEntityUuid, WebId } from "@blockprotocol/type-system";
 import type { FileStorageProvider } from "@local/hash-backend-utils/file-storage";
 import type Keyv from "keyv";
 
@@ -89,7 +85,7 @@ describe("resolveInvocation (supply-chain analyses)", () => {
     clearAnalysisRegistry();
     registerAnalyses(supplyChainAnalyses);
     mockedGetRole.mockReset();
-    mockedGetRole.mockResolvedValue("member" as RoleName);
+    mockedGetRole.mockResolvedValue("member");
   });
 
   it("resolves productGraph to a presigned graph artifact", async () => {
@@ -387,7 +383,7 @@ describe("resolveInvocation (supply-chain analyses)", () => {
         getObjectLastModified: async () => {
           throw new Error("Storage unavailable");
         },
-      } as unknown as FileStorageProvider,
+      },
       cache,
     });
 

apps/hash-api/src/auth/kratos-endpoint-allowlist.test.ts

@@ -14,7 +14,7 @@ import {
 } from "./kratos-endpoint-allowlist";
 
 import type { Logger } from "@local/hash-backend-utils/logger";
-import type { NextFunction, Request, RequestHandler, Response } from "express";
+import type { Request, Response } from "express";
 import type { AddressInfo } from "node:net";
 
 vi.mock("@sentry/node", () => ({ captureMessage: vi.fn() }));
@@ -325,7 +325,7 @@ describe("guardKratosProxy", () => {
 
     const guarded = guardKratosProxy({
       logger: { error } as unknown as Logger,
-      proxy: proxy as unknown as RequestHandler,
+      proxy,
     });
 
     const call = (
@@ -341,7 +341,7 @@ describe("guardKratosProxy", () => {
           ip,
         } as unknown as Request,
         { sendStatus } as unknown as Response,
-        next as unknown as NextFunction,
+        next,
       );
     };
 

apps/hash-api/src/graph/knowledge/primitive/entity/before-update-entity-hooks/user-before-update-entity-hook-callback.ts

@@ -33,11 +33,7 @@ import {
 
 import type { ImpureGraphContext } from "../../../../context-types";
 import type { BeforeUpdateEntityHookCallback } from "../update-entity-hooks";
-import type {
-  ActorEntityUuid,
-  BaseUrl,
-  WebId,
-} from "@blockprotocol/type-system";
+import type { ActorEntityUuid, BaseUrl } from "@blockprotocol/type-system";
 import type { UserProperties } from "@local/hash-isomorphic-utils/system-types/user";
 
 /**
@@ -255,7 +251,7 @@ export const userBeforeEntityUpdateHookCallback: BeforeUpdateEntityHookCallback
       await updateWebShortname(
         context.graphApi,
         { actorId: systemAccountId },
-        { webId: user.accountId as WebId, shortname: updatedShortname },
+        { webId: user.accountId, shortname: updatedShortname },
       );
     }
   };

apps/hash-api/src/graph/knowledge/system-types/comment.ts

@@ -453,7 +453,7 @@ export const getCommentAncestorBlock: ImpureGraphFunction<
     )
   ) {
     // @todo - make sure the entity is really a block
-    return getBlockFromEntity({ entity: parentEntity as Block["entity"] });
+    return getBlockFromEntity({ entity: parentEntity });
   } else {
     return getCommentAncestorBlock(context, authentication, {
       commentEntityId: parentEntity.metadata.recordId.entityId,

apps/hash-api/src/graph/knowledge/system-types/user-secret.ts

@@ -15,7 +15,6 @@ import type {
   MachineId,
   ProvidedEntityEditionProvenance,
   UserId,
-  WebId,
 } from "@blockprotocol/type-system";
 import type {
   UserSecretService,
@@ -165,7 +164,7 @@ export const createUserSecret = async <
     authentication,
     {
       entityTypeIds: [systemEntityTypes.userSecret.entityTypeId],
-      webId: userAccountId as WebId,
+      webId: userAccountId,
       entityUuid: userSecretEntityUuid,
       properties: secretMetadata,
       policies: [
@@ -188,7 +187,7 @@ export const createUserSecret = async <
     { graphApi, provenance },
     authentication,
     {
-      webId: userAccountId as WebId,
+      webId: userAccountId,
       entityUuid: usesUserSecretEntityUuid,
       properties: { value: {} },
       linkData: {