diff --git a/.build-raptor.json b/.build-raptor.jsonc
similarity index 76%
rename from .build-raptor.json
rename to .build-raptor.jsonc
index 630bbf98..00728412 100644
--- a/.build-raptor.json
+++ b/.build-raptor.jsonc
@@ -1,7 +1,9 @@
 {
   "verbosePrintTasks": [],
   "tightFingerprints": true,
+  "fingerprintSeed": "1",
   "repoProtocol": {
+    "compilerExecutable": "tsgo",
     "install": "dormant",
     "additionalJestEnvVars": {
       "NODE_OPTIONS": "--experimental-vm-modules"
diff --git a/modules/build-raptor-core-testkit/src/simple-node-repo-protocol.ts b/modules/build-raptor-core-testkit/src/simple-node-repo-protocol.ts
index 72591abe..e79e71ca 100644
--- a/modules/build-raptor-core-testkit/src/simple-node-repo-protocol.ts
+++ b/modules/build-raptor-core-testkit/src/simple-node-repo-protocol.ts
@@ -92,8 +92,8 @@ export class SimpleNodeRepoProtocol implements RepoProtocol {
 
   private async read() {
     const list = await fs.promises.readdir(this.rootDir.resolve(this.pathToModulesDir))
-    return await promises(
-      list.map(async name => {
+    const ret = await promises(list)
+      .map(async name => {
         const pir = this.pathToModulesDir.expand(name)
         const parsed = await this.readPackageJsonAt(pir)
         return {
@@ -101,8 +101,10 @@ export class SimpleNodeRepoProtocol implements RepoProtocol {
           id: UnitId(parsed.name),
           packageJson: parsed,
         }
-      }),
-    ).reify()
+      })
+      .reify()
+
+    return ret
   }
 
   async getUnits(): Promise<UnitMetadata[]> {
diff --git a/modules/misc/tests/promises.spec.ts b/modules/misc/tests/promises.spec.ts
index 7e72a711..45ca7c4c 100644
--- a/modules/misc/tests/promises.spec.ts
+++ b/modules/misc/tests/promises.spec.ts
@@ -30,15 +30,21 @@ describe('promises', () => {
       expect(await ps.reify()).toEqual(['four', 'and', 'years'])
     })
     test('can be applied also to Promises', async () => {
-      const ps = promises([Promise.resolve(1), Promise.resolve(2), Promise.resolve(3), Promise.resolve(4)]).filter(
-        async x => x % 3 === 1,
-      )
+      const ps = promises<number>([
+        Promise.resolve(1),
+        Promise.resolve(2),
+        Promise.resolve(3),
+        Promise.resolve(4),
+      ]).filter(async x => x % 3 === 1)
       expect(await ps.reify()).toEqual([1, 4])
     })
     test('allows the predicate to be a plain (non async) function', async () => {
-      const ps = promises([Promise.resolve(1), Promise.resolve(2), Promise.resolve(3), Promise.resolve(4)]).filter(
-        x => x % 2 === 0,
-      )
+      const ps = promises<number>([
+        Promise.resolve(1),
+        Promise.resolve(2),
+        Promise.resolve(3),
+        Promise.resolve(4),
+      ]).filter(x => x % 2 === 0)
       expect(await ps.reify()).toEqual([2, 4])
     })
     test('combined with map', async () => {
diff --git a/package.json b/package.json
index 5adf1623..63673300 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
     "@types/node": "^20.0.0",
     "@typescript-eslint/eslint-plugin": "^5.7.0",
     "@typescript-eslint/parser": "^5.7.0",
+    "@typescript/native-preview": "^7.0.0-dev.20251217.1",
     "dts-bundle-generator": "^9.5.1",
     "esbuild": "^0.25.1",
     "eslint": "^8.45.0",
diff --git a/tsconfig-base.json b/tsconfig-base.json
index 5d6a52fe..833ca735 100644
--- a/tsconfig-base.json
+++ b/tsconfig-base.json
@@ -13,7 +13,6 @@
     "esModuleInterop": true,
     "skipLibCheck": true,
     "resolveJsonModule": true,
-    "baseUrl": ".",
     "paths": {
       "safe-stable-stringify": ["./types/safe-stable-stringify"]
     }
diff --git a/yarn.lock b/yarn.lock
index b29bf4bd..e114f6be 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2325,6 +2325,54 @@
     "@typescript-eslint/types" "5.7.0"
     eslint-visitor-keys "^3.0.0"
 
+"@typescript/native-preview-darwin-arm64@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-darwin-arm64/-/native-preview-darwin-arm64-7.0.0-dev.20251225.1.tgz#940086b34e0d31aecc96f7c9e89728daa0310909"
+  integrity sha512-YyjUjsQzJgx48BxtDQ40AfOdXexxcdVGNVA1m5pbuZeb4SwpKoRHy9eBq/QhPDNQApZtQB5RuEb5/X8lfTeaQw==
+
+"@typescript/native-preview-darwin-x64@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-darwin-x64/-/native-preview-darwin-x64-7.0.0-dev.20251225.1.tgz#9e2761156e1ac6cd3e1936eca8ccde95f5025ce3"
+  integrity sha512-GPQ/Xm5FNGoDYm0+BeReBrCvdyUrTP1ZSBqHGR+lkKBmSrAfwaaflGis31TPjsBiXg/MgvFxVNAcYh9lJOjueA==
+
+"@typescript/native-preview-linux-arm64@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-linux-arm64/-/native-preview-linux-arm64-7.0.0-dev.20251225.1.tgz#a30a851db09a7e4e498ac43db420abd9821d6a7b"
+  integrity sha512-n6RAbCr7JwdwdXJZsWqa9A+lz6CFjHJ24JeUy3xDFLw5N2kIDoINpAPS3qILsChBuMKwSKNug2tNF0Us4Pf2qg==
+
+"@typescript/native-preview-linux-arm@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-linux-arm/-/native-preview-linux-arm-7.0.0-dev.20251225.1.tgz#910d3fa6c84c561ce66661e0330e054577d492cc"
+  integrity sha512-N/syQPMvfboRiC8YEwSMqqN0d5HK/ha3ITahh5jW8LA+3EoPGygWnDVvlaQubV7Pwm/K9vvf9O7mMS1tAOo1tA==
+
+"@typescript/native-preview-linux-x64@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-linux-x64/-/native-preview-linux-x64-7.0.0-dev.20251225.1.tgz#c5c67e858bd060c48a18afcb994d5cf56d08fe27"
+  integrity sha512-mG3I+Gr6Htgvz8Go7jG+GlEnML6bIznbk0O9v1dtLrBOgKG9LqGPp3mjRkLGD54yWeE0GW2EWOFNfmnB44tumg==
+
+"@typescript/native-preview-win32-arm64@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-win32-arm64/-/native-preview-win32-arm64-7.0.0-dev.20251225.1.tgz#8efa1afc55569063154e5c12b3b1319bb13f16b0"
+  integrity sha512-+kJtJ0HQXqBmzKdQRSe+EUTxHccoME9j3x6FYMInPpk2jsZgiVmnRc7MsaUSoHb6GhgFMF0aGSNIcw3QfgJ/gg==
+
+"@typescript/native-preview-win32-x64@7.0.0-dev.20251225.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview-win32-x64/-/native-preview-win32-x64-7.0.0-dev.20251225.1.tgz#59c839ea9cb90f3db4982b581399d96bca8b7f49"
+  integrity sha512-e0r08Y6Yps8x0kw3IfiJ8R2afyqIupVvzaxhydKtR0bVNhA/HbVCLYNEB7UmjRS3sWqGYVA+GxegMpQKryrfog==
+
+"@typescript/native-preview@^7.0.0-dev.20251217.1":
+  version "7.0.0-dev.20251225.1"
+  resolved "https://registry.yarnpkg.com/@typescript/native-preview/-/native-preview-7.0.0-dev.20251225.1.tgz#093680b7c2750b812ba8b2ae2dd70c905337886e"
+  integrity sha512-vb+1x8j1uRG6hxKWJ3I8XDuq8FvQw0qTDPOQK/DtBZOdoWDFDWdmvFgGQwJ6h2se/W0x31Y4r+SFxj9B/uzgTA==
+  optionalDependencies:
+    "@typescript/native-preview-darwin-arm64" "7.0.0-dev.20251225.1"
+    "@typescript/native-preview-darwin-x64" "7.0.0-dev.20251225.1"
+    "@typescript/native-preview-linux-arm" "7.0.0-dev.20251225.1"
+    "@typescript/native-preview-linux-arm64" "7.0.0-dev.20251225.1"
+    "@typescript/native-preview-linux-x64" "7.0.0-dev.20251225.1"
+    "@typescript/native-preview-win32-arm64" "7.0.0-dev.20251225.1"
+    "@typescript/native-preview-win32-x64" "7.0.0-dev.20251225.1"
+
 acorn-jsx@^5.3.2:
   version "5.3.2"
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"