Track minimum language version for various language features (#57670)

src/compiler/commandLineParser.ts

@@ -144,6 +144,9 @@ export const inverseJsxOptionMap = new Map(mapIterator(jsxOptionMap.entries(), (
 //       order in the generated program (see `getDefaultLibPriority` in program.ts). This
 //       order also affects overload resolution when a type declared in one lib is
 //       augmented in another lib.
+// NOTE: We must reevaluate the target for upcoming features when each successive TC39 edition is ratified in
+//       June of each year. This includes changes to `LanguageFeatureMinimumTarget`, `ScriptTarget`,
+//       transformers/esnext.ts, commandLineParser.ts, and the contents of each lib/esnext.*.d.ts file.
 const libEntries: [string, string][] = [
     // JavaScript only
     ["es5", "lib.es5.d.ts"],