fix(cli): preserve comments in doc tests (#26828)

This commit makes comments in code snippets in JSDoc or markdown
preserved when they are executed as tests. In particular, this is needed
to get TypeScript special comments such as `@ts-ignore` or
`@ts-expect-error` to work correctly.

Fixes #26728

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/specs/test/doc_ts_expect_error/mod.ts b/tests/specs/test/doc_ts_expect_error/mod.ts
new file mode 100644
index 000000000..eeace602a
--- /dev/null
+++ b/tests/specs/test/doc_ts_expect_error/mod.ts
@@ -0,0 +1,13 @@
+/**
+ * ```ts
+ * import { add } from "./mod.ts";
+ *
+ * add(1, 2);
+ *
+ * // @ts-expect-error: can only add numbers
+ * add('1', '2');
+ * ```
+ */
+export function add(first: number, second: number) {
+  return first + second;
+}