vscode: replaced unwrapNotNil() with ! as per @matklad

editors/code/package-lock.json

@@ -753,19 +753,6 @@
                 "os-tmpdir": "~1.0.1"
             }
         },
-        "ts-not-nil": {
-            "version": "1.0.1",
-            "resolved": "https://registry.npmjs.org/ts-not-nil/-/ts-not-nil-1.0.1.tgz",
-            "integrity": "sha512-19+u+3okJddVZlrIdTOdFBaMsHYDInIGDPiujxfRa0RS2Ch5055zVG4GAqa+CZ/Rd1a+7ORSm8O4+2kesPymtw==",
-            "requires": {
-                "ts-typedefs": ">=3.2.0"
-            }
-        },
-        "ts-typedefs": {
-            "version": "3.2.0",
-            "resolved": "https://registry.npmjs.org/ts-typedefs/-/ts-typedefs-3.2.0.tgz",
-            "integrity": "sha512-NglEH2YiY40YxNAvwBISqqXRTKlQq6x+qoCF+tkjPxwrPbrkmq7V3LXavmxrD63fENtMhFkcqgMJtOirtow9iA=="
-        },
         "tslib": {
             "version": "1.10.0",
             "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",

editors/code/package.json

@@ -27,7 +27,6 @@
         "jsonc-parser": "^2.1.0",
         "node-fetch": "^2.6.0",
         "throttle-debounce": "^2.1.0",
-        "ts-not-nil": "^1.0.1",
         "vscode-languageclient": "^6.1.0"
     },
     "devDependencies": {

editors/code/src/installation/language_server.ts

@@ -1,4 +1,3 @@
-import { unwrapNotNil } from "ts-not-nil";
 import { spawnSync } from "child_process";
 import * as vscode from "vscode";
 import * as path from "path";
@@ -12,12 +11,9 @@ import { downloadFile } from "./download_file";
 export async function downloadLatestLanguageServer(
     {file: artifactFileName, dir: installationDir, repo}: BinarySource.GithubRelease
 ) {
-    const binaryMetadata = await fetchLatestArtifactMetadata(repo, artifactFileName);
-
-    const {
-        releaseName,
-        downloadUrl
-    } = unwrapNotNil(binaryMetadata, `Latest GitHub release lacks "${artifactFileName}" file`);
+    const { releaseName, downloadUrl } = (await fetchLatestArtifactMetadata(
+        repo, artifactFileName
+    ))!;
 
     await fs.mkdir(installationDir).catch(err => assert.strictEqual(
         err?.code,