fix: type-level arithmetic!

Working around microsoft/TypeScript#26382,
which will likely never get solved.

Author: lishaduck

lib/min-version.js

@@ -8,9 +8,14 @@ const chalk = require('chalk');
 const ErrorMessage = require('./error-message');
 const PathHelpers = require('./path-helpers');
 
-const minimalVersion = {major: 2, minor: 14};
-// prettier-ignore
-const supportedRange = `${minimalVersion.major}.${minimalVersion.minor}.0 <= v < ${minimalVersion.major + 1}.0.0`
+const minimalVersion = /** @type {const} */ ({major: 2, minor: 14});
+
+// TS can't do arithmetic, so make sure the cast is right when bumping the major.
+const nextMajor = /** @type {3} */ (minimalVersion.major + 1);
+
+const supportedRange = /** @type {const} */ (
+  `${minimalVersion.major}.${minimalVersion.minor}.0 <= v < ${nextMajor}.0.0`
+);
 
 /**
  * If given an input version string smaller than the hardcoded `minimalVersion`,