diff --git a/.eslintrc.js b/.eslintrc.js
index b4b5f6fb1..1d424223b 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -32,8 +32,7 @@ module.exports = {
     'test/snapshots',
     'test/temporary',
     'vendor/',
-    '.eslintrc.js',
-    'new-package/elm-review-package-tests/check-previews-compile.js'
+    '.eslintrc.js'
   ],
   rules: {
     // Style disagreements with XO.
@@ -112,6 +111,8 @@ module.exports = {
       files: ['./new-package/**/*.js'],
       rules: {
         'n/no-process-exit': 'off',
+        'n/no-missing-require': 'off',
+        '@typescript-eslint/ban-ts-comment': 'off',
         '@typescript-eslint/unbound-method': 'off' // TODO: Fix this warning. @lishaduck just got confused.
       }
     }
diff --git a/.prettierignore b/.prettierignore
index 0bee5bea6..2f4cba9ef 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -9,5 +9,4 @@
 test/**/*.json
 test/temporary/
 test/run-snapshots/
-vendor/exit.js
 .turbo
diff --git a/lib/new-package.js b/lib/new-package.js
index 8804f14d4..6e752a1ba 100644
--- a/lib/new-package.js
+++ b/lib/new-package.js
@@ -310,6 +310,14 @@ ElmjutsuDumMyM0DuL3.elm
     }
   );
 
+  const checkPreviewsCompile = path.join(
+    packageTests,
+    'check-previews-compile.js'
+  );
+  const data = await FS.readFile(checkPreviewsCompile);
+  const result = data.replace(/\/\/ @ts-ignore - Generated file.\n/, '');
+  await FS.writeFile(checkPreviewsCompile, result, 'utf8');
+
   Spinner.succeed();
 }
 
diff --git a/new-package/elm-review-package-tests/check-previews-compile.js b/new-package/elm-review-package-tests/check-previews-compile.js
index 78057dc12..b8ae63e65 100644
--- a/new-package/elm-review-package-tests/check-previews-compile.js
+++ b/new-package/elm-review-package-tests/check-previews-compile.js
@@ -1,16 +1,18 @@
 #!/usr/bin/env node
 
-const path = require('path');
+const path = require('node:path');
 const Ansi = require('./helpers/ansi');
-const {execSync} = require('child_process');
+const {execSync} = require('node:child_process');
 const {findPreviewConfigurations} = require('./helpers/find-configurations');
+// @ts-ignore - Generated file.
 const packageDependencies = require('../elm.json').dependencies;
 
 const root = path.dirname(__dirname);
 
 // Find all elm.json files
-
-findPreviewConfigurations().forEach(checkThatExampleCompiles);
+for (const example of findPreviewConfigurations()) {
+  checkThatExampleCompiles(example);
+}
 
 function checkThatExampleCompiles(exampleConfiguration) {
   const exampleConfigurationElmJson = require(`${exampleConfiguration}/elm.json`);
@@ -48,7 +50,6 @@ and make the necessary changes to make it compile.`
       }
 
       success(exampleConfiguration);
-      return;
     } catch {
       console.log(
         `An error occurred while trying to check whether the ${Ansi.yellow(
@@ -66,7 +67,7 @@ function success(config) {
 }
 
 function checkDepsAreCompatible(exampleConfiguration, previewDependencies) {
-  Object.entries(packageDependencies).forEach(([depName, constraint]) => {
+  for (const [depName, constraint] of Object.entries(packageDependencies)) {
     if (!(depName in previewDependencies)) {
       console.error(
         `Dependency ${depName} is missing in the ${exampleConfiguration}/ configuration`
@@ -81,12 +82,13 @@ function checkDepsAreCompatible(exampleConfiguration, previewDependencies) {
       previewDependencies[depName]
     );
     delete previewDependencies[depName];
-  });
+  }
 
   const remainingKeys = Object.keys(previewDependencies);
-  if (remainingKeys.length !== 0) {
+  if (remainingKeys.length > 0) {
     console.error(
-      `There are extraneous dependencies in the ${exampleConfiguration}/ configuration: ${remainingKeys}`
+      // prettier-ignore
+      `There are extraneous dependencies in the ${exampleConfiguration}/ configuration: ${remainingKeys.join(', ')}`
     );
     process.exit(1);
   }
diff --git a/test/run-snapshots/elm-review-something-for-new-rule/elm-review-package-tests/check-previews-compile.js b/test/run-snapshots/elm-review-something-for-new-rule/elm-review-package-tests/check-previews-compile.js
index 78057dc12..5f55a2c91 100644
--- a/test/run-snapshots/elm-review-something-for-new-rule/elm-review-package-tests/check-previews-compile.js
+++ b/test/run-snapshots/elm-review-something-for-new-rule/elm-review-package-tests/check-previews-compile.js
@@ -1,16 +1,17 @@
 #!/usr/bin/env node
 
-const path = require('path');
+const path = require('node:path');
 const Ansi = require('./helpers/ansi');
-const {execSync} = require('child_process');
+const {execSync} = require('node:child_process');
 const {findPreviewConfigurations} = require('./helpers/find-configurations');
 const packageDependencies = require('../elm.json').dependencies;
 
 const root = path.dirname(__dirname);
 
 // Find all elm.json files
-
-findPreviewConfigurations().forEach(checkThatExampleCompiles);
+for (const example of findPreviewConfigurations()) {
+  checkThatExampleCompiles(example);
+}
 
 function checkThatExampleCompiles(exampleConfiguration) {
   const exampleConfigurationElmJson = require(`${exampleConfiguration}/elm.json`);
@@ -48,7 +49,6 @@ and make the necessary changes to make it compile.`
       }
 
       success(exampleConfiguration);
-      return;
     } catch {
       console.log(
         `An error occurred while trying to check whether the ${Ansi.yellow(
@@ -66,7 +66,7 @@ function success(config) {
 }
 
 function checkDepsAreCompatible(exampleConfiguration, previewDependencies) {
-  Object.entries(packageDependencies).forEach(([depName, constraint]) => {
+  for (const [depName, constraint] of Object.entries(packageDependencies)) {
     if (!(depName in previewDependencies)) {
       console.error(
         `Dependency ${depName} is missing in the ${exampleConfiguration}/ configuration`
@@ -81,12 +81,13 @@ function checkDepsAreCompatible(exampleConfiguration, previewDependencies) {
       previewDependencies[depName]
     );
     delete previewDependencies[depName];
-  });
+  }
 
   const remainingKeys = Object.keys(previewDependencies);
-  if (remainingKeys.length !== 0) {
+  if (remainingKeys.length > 0) {
     console.error(
-      `There are extraneous dependencies in the ${exampleConfiguration}/ configuration: ${remainingKeys}`
+      // prettier-ignore
+      `There are extraneous dependencies in the ${exampleConfiguration}/ configuration: ${remainingKeys.join(', ')}`
     );
     process.exit(1);
   }
diff --git a/test/run-snapshots/elm-review-something/elm-review-package-tests/check-previews-compile.js b/test/run-snapshots/elm-review-something/elm-review-package-tests/check-previews-compile.js
index 78057dc12..5f55a2c91 100644
--- a/test/run-snapshots/elm-review-something/elm-review-package-tests/check-previews-compile.js
+++ b/test/run-snapshots/elm-review-something/elm-review-package-tests/check-previews-compile.js
@@ -1,16 +1,17 @@
 #!/usr/bin/env node
 
-const path = require('path');
+const path = require('node:path');
 const Ansi = require('./helpers/ansi');
-const {execSync} = require('child_process');
+const {execSync} = require('node:child_process');
 const {findPreviewConfigurations} = require('./helpers/find-configurations');
 const packageDependencies = require('../elm.json').dependencies;
 
 const root = path.dirname(__dirname);
 
 // Find all elm.json files
-
-findPreviewConfigurations().forEach(checkThatExampleCompiles);
+for (const example of findPreviewConfigurations()) {
+  checkThatExampleCompiles(example);
+}
 
 function checkThatExampleCompiles(exampleConfiguration) {
   const exampleConfigurationElmJson = require(`${exampleConfiguration}/elm.json`);
@@ -48,7 +49,6 @@ and make the necessary changes to make it compile.`
       }
 
       success(exampleConfiguration);
-      return;
     } catch {
       console.log(
         `An error occurred while trying to check whether the ${Ansi.yellow(
@@ -66,7 +66,7 @@ function success(config) {
 }
 
 function checkDepsAreCompatible(exampleConfiguration, previewDependencies) {
-  Object.entries(packageDependencies).forEach(([depName, constraint]) => {
+  for (const [depName, constraint] of Object.entries(packageDependencies)) {
     if (!(depName in previewDependencies)) {
       console.error(
         `Dependency ${depName} is missing in the ${exampleConfiguration}/ configuration`
@@ -81,12 +81,13 @@ function checkDepsAreCompatible(exampleConfiguration, previewDependencies) {
       previewDependencies[depName]
     );
     delete previewDependencies[depName];
-  });
+  }
 
   const remainingKeys = Object.keys(previewDependencies);
-  if (remainingKeys.length !== 0) {
+  if (remainingKeys.length > 0) {
     console.error(
-      `There are extraneous dependencies in the ${exampleConfiguration}/ configuration: ${remainingKeys}`
+      // prettier-ignore
+      `There are extraneous dependencies in the ${exampleConfiguration}/ configuration: ${remainingKeys.join(', ')}`
     );
     process.exit(1);
   }
diff --git a/tsconfig.json b/tsconfig.json
index c06f4be18..8269733bc 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -28,11 +28,5 @@
     "test/**/*",
     "jest.config.js"
   ],
-  "exclude": [
-    "node_modules",
-    "**/elm-stuff/",
-    ".eslintrc.js",
-    "new-package/elm-review-package-tests/check-previews-compile.js",
-    "test/temporary"
-  ]
+  "exclude": ["node_modules", "**/elm-stuff/", ".eslintrc.js", "test/temporary"]
 }
diff --git a/tsconfig.no-implicit-any.json b/tsconfig.no-implicit-any.json
index 404bd5421..39237180f 100644
--- a/tsconfig.no-implicit-any.json
+++ b/tsconfig.no-implicit-any.json
@@ -32,6 +32,7 @@
     "lib/state.js",
     "lib/styled-message.js",
     "lib/suppressed-errors.js",
+    "vendor/exit.js",
     "jest.config.js"
   ]
 }
diff --git a/turbo.json b/turbo.json
index 92ac8f846..5f173742b 100644
--- a/turbo.json
+++ b/turbo.json
@@ -23,10 +23,10 @@
       ]
     },
     "eslint-check": {
-      "inputs": ["lib/*", ".eslintrc.js"]
+      "inputs": ["lib/*", "vendor/*", ".eslintrc.js"]
     },
     "eslint-fix": {
-      "inputs": ["lib/*", ".eslintrc.js"]
+      "inputs": ["lib/*", "vendor/*", ".eslintrc.js"]
     },
     "js-check": {
       "dependsOn": ["eslint-check", "prettier-check"]
@@ -35,13 +35,18 @@
       "dependsOn": ["eslint-fix", "prettier-fix"]
     },
     "prettier-check": {
-      "inputs": ["lib/*", ".prettierrc.json", ".prettierignore"]
+      "inputs": ["lib/*", "vendor/*", ".prettierrc.json", ".prettierignore"]
     },
     "prettier-fix": {
-      "inputs": ["lib/*", ".prettierrc.json", ".prettierignore"]
+      "inputs": ["lib/*", "vendor/*", ".prettierrc.json", ".prettierignore"]
     },
     "tsc": {
-      "inputs": ["lib/*", "tsconfig.json", "tsconfig.*.json"]
+      "inputs": [
+        "lib/*",
+        "new-package/elm-review-package-tests/**/*.js",
+        "tsconfig.json",
+        "tsconfig.*.json"
+      ]
     },
     "tsc-watch": {
       "inputs": ["lib/*", "tsconfig.json"],
diff --git a/vendor/exit.js b/vendor/exit.js
index c4f1abf29..494cea90a 100644
--- a/vendor/exit.js
+++ b/vendor/exit.js
@@ -1,5 +1,3 @@
-// @ts-nocheck
-
 /*
  * exit
  * https://github.com/cowboy/node-exit
@@ -12,37 +10,41 @@
 
 /**
  * @param {number} exitCode
- * @param {Array<NodeJS.WriteStream>} [streams=undefined]
+ * @param {Array<NodeJS.WriteStream>} [streams]
  * @returns {never}
  */
-module.exports = function exit(exitCode, streams) {
-  if (!streams) { streams = [process.stdout, process.stderr]; }
+module.exports = function exit(exitCode, streams = []) {
+  if (!streams) {
+    streams = [process.stdout, process.stderr];
+  }
   var drainCount = 0;
   // Actually exit if all streams are drained.
+  // @ts-expect-error - This is really `never | void`, but TS isn't smart enough to deal with that later on.
+  /** @return {never} */
   function tryToExit() {
     if (drainCount === streams.length) {
       process.exit(exitCode);
     }
   }
-  streams.forEach(function(stream) {
+  streams.forEach(function (stream) {
     // Count drained streams now, but monitor non-drained streams.
-    if (stream.bufferSize === 0) {
+    if (stream.writableLength === 0) {
       drainCount++;
     } else {
-      stream.write('', 'utf-8', function() {
+      stream.write('', 'utf-8', function () {
         drainCount++;
         tryToExit();
       });
     }
     // Prevent further writing.
-    stream.write = function() {};
+    stream.write = () => true;
   });
   // If all streams were already drained, exit now.
   tryToExit();
   // In Windows, when run as a Node.js child process, a script utilizing
   // this library might just exit with a 0 exit code, regardless. This code,
   // despite the fact that it looks a bit crazy, appears to fix that.
-  process.on('exit', function() {
+  process.on('exit', function () {
     process.exit(exitCode);
   });
 };