Tooling update

.eslintrc.json

@@ -3,23 +3,23 @@
     "browser": true,
     "es2021": true
   },
-  "extends": [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended"
-  ],
-  "overrides": [],
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
   "parser": "@typescript-eslint/parser",
   "parserOptions": {
     "ecmaVersion": "latest",
     "sourceType": "module"
   },
-  "plugins": [
-    "@typescript-eslint"
-  ],
+  "plugins": ["@typescript-eslint"],
   "rules": {
-    "semi": [
-      "error",
-      "always"
-    ]
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      {
+        "varsIgnorePattern": "^_",
+        "argsIgnorePattern": "^_"
+      }
+    ],
+    "@typescript-eslint/no-explicit-any": "off",
+    "semi": ["error", "always"]
   }
-}
+}

.vscode/extensions.json

@@ -1,3 +1,6 @@
 {
-  "recommendations": ["ms-vscode.vscode-typescript-tslint-plugin"]
-}
+  "recommendations": [
+    "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode"
+  ]
+}

package.json

@@ -59,7 +59,6 @@
           ".cabal"
         ]
       },
-
       {
         "id": "literate haskell",
         "aliases": [
@@ -1153,8 +1152,8 @@
     "@types/node": "^20.11.17",
     "@types/vscode": "^1.82.0",
     "@types/which": "^3.0.3",
-    "@typescript-eslint/eslint-plugin": "^5.62.0",
-    "@typescript-eslint/parser": "^5.62.0",
+    "@typescript-eslint/eslint-plugin": "^6.21.0",
+    "@typescript-eslint/parser": "^6.21.0",
     "@vscode/test-electron": "^2.3.8",
     "eslint": "^8.56.0",
     "eslint-webpack-plugin": "^4.0.1",

src/errors.ts

@@ -1,6 +1,6 @@
 import { Uri } from 'vscode';
 
-export class HlsError extends Error {}
+export class HlsError extends Error { }
 
 export class MissingToolError extends HlsError {
   public readonly tool: string;

src/hlsBinaries.ts

@@ -278,13 +278,13 @@ export async function findHaskellLanguageServer(
       const stackInstalled = latestStack ? await toolInstalled(context, logger, 'stack', latestStack) : undefined;
       const ghcInstalled = executableExists('ghc')
         ? new InstalledTool(
-            'ghc',
-            await callAsync(`ghc${exeExt}`, ['--numeric-version'], logger, undefined, undefined, false)
-          )
+          'ghc',
+          await callAsync(`ghc${exeExt}`, ['--numeric-version'], logger, undefined, undefined, false)
+        )
         : // if recGHC is null, that means user disabled automatic handling,
         recGHC !== null
-        ? await toolInstalled(context, logger, 'ghc', recGHC)
-        : undefined;
+          ? await toolInstalled(context, logger, 'ghc', recGHC)
+          : undefined;
       const toInstall: InstalledTool[] = [hlsInstalled, cabalInstalled, stackInstalled, ghcInstalled].filter(
         (tool) => tool && !tool.installed
       ) as InstalledTool[];
@@ -459,12 +459,12 @@ async function getLatestProjectHLS(
   // get project GHC version, but fallback to system ghc if necessary.
   const projectGhc = toolchainBindir
     ? await getProjectGHCVersion(toolchainBindir, workingDir, logger).catch(async (e) => {
-        logger.error(`${e}`);
-        window.showWarningMessage(
-          `I had trouble figuring out the exact GHC version for the project. Falling back to using 'ghc${exeExt}'.`
-        );
-        return await callAsync(`ghc${exeExt}`, ['--numeric-version'], logger, undefined, undefined, false);
-      })
+      logger.error(`${e}`);
+      window.showWarningMessage(
+        `I had trouble figuring out the exact GHC version for the project. Falling back to using 'ghc${exeExt}'.`
+      );
+      return await callAsync(`ghc${exeExt}`, ['--numeric-version'], logger, undefined, undefined, false);
+    })
     : await callAsync(`ghc${exeExt}`, ['--numeric-version'], logger, undefined, undefined, false);
 
   // first we get supported GHC versions from available HLS bindists (whether installed or not)
@@ -858,13 +858,13 @@ async function getReleaseMetadata(
     : undefined;
   const opts: https.RequestOptions = releasesUrl
     ? {
-        host: releasesUrl.host,
-        path: releasesUrl.pathname,
-      }
+      host: releasesUrl.host,
+      path: releasesUrl.pathname,
+    }
     : {
-        host: 'raw.githubusercontent.com',
-        path: '/haskell/ghcup-metadata/master/hls-metadata-0.0.1.json',
-      };
+      host: 'raw.githubusercontent.com',
+      path: '/haskell/ghcup-metadata/master/hls-metadata-0.0.1.json',
+    };
 
   const offlineCache = path.join(storagePath, 'ghcupReleases.cache.json');
 
@@ -915,7 +915,7 @@ async function getReleaseMetadata(
 
       window.showWarningMessage(
         "Couldn't get the latest haskell-language-server releases from GitHub, used local cache instead: " +
-          githubError.message
+        githubError.message
       );
       return cachedInfoParsed;
     } catch (fileError) {

src/utils.ts

@@ -197,8 +197,8 @@ export function resolvePATHPlaceHolders(path: string) {
   return path
     .replace('${HOME}', os.homedir)
     .replace('${home}', os.homedir)
-    .replace('$PATH', process.env.PATH!)
-    .replace('${PATH}', process.env.PATH!);
+    .replace('$PATH', process.env.PATH ?? '$PATH')
+    .replace('${PATH}', process.env.PATH ?? '${PATH}');
 }
 
 // also honours serverEnvironment.PATH
@@ -207,7 +207,7 @@ export async function addPathToProcessPath(extraPath: string): Promise<string> {
   const serverEnvironment: IEnvVars = (await workspace.getConfiguration('haskell').get('serverEnvironment')) || {};
   const path: string[] = serverEnvironment.PATH
     ? serverEnvironment.PATH.split(pathSep).map((p) => resolvePATHPlaceHolders(p))
-    : process.env.PATH!.split(pathSep);
+    : process.env.PATH?.split(pathSep) ?? [];
   path.unshift(extraPath);
   return path.join(pathSep);
 }