fix: postfix option name with --

src/compiler/commandLineParser.ts

@@ -1821,7 +1821,7 @@ function createDiagnosticForInvalidCustomType(opt: CommandLineOptionOfCustomType
         // does not support that ECMAScript version.
         const esVersion = extractECMAScriptVersion(value);
         if (esVersion !== undefined && esVersion >= 2015) {
-            return createDiagnostic(Diagnostics.Argument_0_for_1_option_is_a_year_not_yet_supported_by_this_version_of_TypeScript, value, opt.name);
+            return createDiagnostic(Diagnostics.Argument_0_for_1_option_is_a_year_not_yet_supported_by_this_version_of_TypeScript, value, `--${opt.name}`);
         }
     }
 

tests/baselines/reference/config/commandLineParsing/parseCommandLine/Parse future ECMAScript version specified for lib and target.js

@@ -8,5 +8,5 @@ WatchOptions::
 FileNames::
 0.ts
 Errors::
-error TS6284: Argument 'es2099' for 'lib' option is a year not yet supported by this version of TypeScript.
-error TS6284: Argument 'es2098' for 'target' option is a year not yet supported by this version of TypeScript.
+error TS6284: Argument 'es2099' for '--lib' option is a year not yet supported by this version of TypeScript.
+error TS6284: Argument 'es2098' for '--target' option is a year not yet supported by this version of TypeScript.