feat: type check codeblocks in Markdown file with "deno test --doc" (#11421)

2 files changed, 32 insertions, 0 deletions

diff --git a/cli/tests/test/doc_markdown.out b/cli/tests/test/doc_markdown.out
new file mode 100644
index 000000000..9d2c35974
--- /dev/null
+++ b/cli/tests/test/doc_markdown.out
@@ -0,0 +1,7 @@
+Check [WILDCARD]/test/doc_markdown/doc.md$11-14.js
+Check [WILDCARD]/test/doc_markdown/doc.md$17-20.ts
+Check [WILDCARD]/test/doc_markdown/doc.md$23-26.ts
+error: TS2322 [ERROR]: Type 'number' is not assignable to type 'string'.
+const a: string = 42;
+      ^
+    at [WILDCARD]/test/doc_markdown/doc.md$23-26.ts:1:7
diff --git a/cli/tests/test/doc_markdown/doc.md b/cli/tests/test/doc_markdown/doc.md
new file mode 100644
index 000000000..e5afb841b
--- /dev/null
+++ b/cli/tests/test/doc_markdown/doc.md
@@ -0,0 +1,25 @@
+# Documentation
+
+The following block does not have a language attribute and should be ignored:
+
+```
+This is a fenced block without attributes, it's invalid and it should be ignored.
+```
+
+The following block should be given a js extension on extraction:
+
+```js
+console.log("js");
+```
+
+The following block should be given a ts extension on extraction:
+
+```ts
+console.log("ts");
+```
+
+The following example will trigger the type-checker to fail:
+
+```ts
+const a: string = 42;
+```