The rewriteImportExtensions option rewrites .ts/.mts/.cts/.tsx extensions in static import/export declarations, but does not handle dynamic import() expressions.

TypeScript's rewriteRelativeImportExtensions compiler option rewrites both static and dynamic imports (see esnextAnd2015.ts — visitImportOrRequireCall). OXC's implementation only visits ImportDeclaration, ExportNamedDeclaration, and ExportAllDeclaration, but not ImportExpression.

Input:

import "./a.ts";
const m = import("./a.ts");

Expected output (with rewriteImportExtensions: "rewrite"):

import "./a.js";
const m = import("./a.js");

Actual output:

import "./a.js";
const m = import("./a.ts"); // not rewritten

Impact: This breaks downstream consumers when packages use rewriteRelativeImportExtensions with OXC transpilation — emitted .js files still reference .ts extensions in dynamic imports, causing module resolution failures at runtime.