diff --git a/bin/docker.js b/bin/docker.js
index 17f9630df..c18474800 100755
--- a/bin/docker.js
+++ b/bin/docker.js
@@ -1,4 +1,5 @@
 #! /usr/bin/env node
+// @ts-check
 /* eslint-disable no-console */
 import { execFile as unpromisifiedExecFile } from 'node:child_process';
 import util from 'node:util';
@@ -36,11 +37,11 @@ async function runDockerCmd(args) {
   const execCmd = execFile('docker', args);
   const child = execCmd.child;
 
-  child.stdout.on('data', chunk => {
+  child.stdout?.on('data', chunk => {
     console.log(chunk.toString());
   });
 
-  child.stderr.on('data', chunk => {
+  child.stderr?.on('data', chunk => {
     console.error(chunk.toString());
   });
 
diff --git a/bin/json-schema-store.js b/bin/json-schema-store.js
index d21c15039..679acdea8 100755
--- a/bin/json-schema-store.js
+++ b/bin/json-schema-store.js
@@ -1,4 +1,5 @@
 #! /usr/bin/env node
+// @ts-check
 /* eslint-disable import/no-extraneous-dependencies */
 import fs from 'node:fs/promises';
 
@@ -22,7 +23,7 @@ const files = [
  */
 async function refreshSchemas() {
   const isUpdate = process.argv.includes('--update');
-  const prettierConfig = await prettier.resolveConfig();
+  const prettierConfig = await prettier.resolveConfig(process.cwd());
   try {
     await Promise.all(
       files.map(async file => {
diff --git a/bin/set-action-image.js b/bin/set-action-image.js
index a2e6fae4f..b0410610f 100755
--- a/bin/set-action-image.js
+++ b/bin/set-action-image.js
@@ -1,4 +1,5 @@
 #! /usr/bin/env node
+// @ts-check
 import fs from 'node:fs/promises';
 
 // eslint-disable-next-line import/no-extraneous-dependencies
@@ -16,8 +17,10 @@ async function setActionImage() {
   // and writes changes back to action.yml file
   const actionFile = await fs.readFile('./action.yml', 'utf-8');
   const actionObj = jsYaml.load(actionFile);
+  // @ts-expect-error it's annoying to type these YAML instances
   const imageURL = new URL(actionObj.runs.image);
   imageURL.pathname = imageURL.pathname.replace(/:.*/g, `:${pkg.version}`);
+  // @ts-expect-error it's annoying to type these YAML instances
   actionObj.runs.image = imageURL.toString();
   const actionYaml = jsYaml.dump(actionObj, { lineWidth: -1 });
   await fs.writeFile('./action.yml', actionYaml, { encoding: 'utf-8' });
diff --git a/bin/set-major-version-tag.js b/bin/set-major-version-tag.js
index 0a4bef4d4..97b351f68 100755
--- a/bin/set-major-version-tag.js
+++ b/bin/set-major-version-tag.js
@@ -1,4 +1,5 @@
 #! /usr/bin/env node
+// @ts-check
 import { execFile as unpromisifiedExecFile } from 'node:child_process';
 import util from 'node:util';
 
@@ -16,12 +17,12 @@ async function runGitCmd(args) {
   const execCmd = execFile('git', args);
   const child = execCmd.child;
 
-  child.stdout.on('data', chunk => {
+  child.stdout?.on('data', chunk => {
     // eslint-disable-next-line no-console
     console.log(chunk.toString());
   });
 
-  child.stderr.on('data', chunk => {
+  child.stderr?.on('data', chunk => {
     // eslint-disable-next-line no-console
     console.error(chunk.toString());
   });
@@ -38,6 +39,10 @@ async function setMajorVersionTag() {
   try {
     const parsedVersion = parse(pkg.version);
 
+    if (!parsedVersion) {
+      throw new Error('Unable to extract semver data from the `package.json` version.');
+    }
+
     if (parsedVersion.prerelease.length) {
       // eslint-disable-next-line no-console
       console.warn('Pre-release version, not setting major version tag');
diff --git a/bin/set-version-output.js b/bin/set-version-output.js
index 8cae398c9..11b9c1428 100755
--- a/bin/set-version-output.js
+++ b/bin/set-version-output.js
@@ -1,4 +1,5 @@
 #! /usr/bin/env node
+// @ts-check
 import * as core from '@actions/core';
 
 // eslint-disable-next-line import/extensions