check ts version if prefer inline set

src/rules/no-duplicates.js

@@ -1,5 +1,7 @@
 import resolve from 'eslint-module-utils/resolve';
 import docsUrl from '../docsUrl';
+import semver from 'semver';
+import typescriptPkg from 'typescript/package.json';
 
 function checkImports(imported, context) {
   for (const [module, nodes] of imported.entries()) {
@@ -109,7 +111,12 @@ function getFix(first, rest, sourceCode, context) {
     const [specifiersText] = specifiers.reduce(
       ([result, needsComma], specifier) => {
         const isTypeSpecifier = specifier.importNode.importKind === 'type';
+
         const preferInline = context.options[0] && context.options[0]['prefer-inline'];
+        if (preferInline && !semver.satisfies(typescriptPkg.version, '>= 4.5')) {
+          throw new Error('Your version of TypeScript does not support inline type imports.');
+        }
+
         const insertText = `${preferInline && isTypeSpecifier ? 'type ' : ''}${specifier.text}`;
         return [
           needsComma && !specifier.isEmpty