md: support undefined/null (parcel-bundler#5928)

gcoakes · Feb 28, 2021 · 349302c · 349302c
1 parent 8a4fa3e
commit 349302c
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/packages/core/diagnostic/src/diagnostic.js b/packages/core/diagnostic/src/diagnostic.js
@@ -293,7 +293,7 @@ export function md(
     let param = params[i];
     result.push(
       strings[i],
-      param[mdVerbatim] ? param.value : escapeMarkdown(`${param}`),
+      param?.[mdVerbatim] ? param.value : escapeMarkdown(`${param}`),
     );
   }
   return result.join('') + strings[strings.length - 1];

diff --git a/packages/core/diagnostic/test/markdown.test.js b/packages/core/diagnostic/test/markdown.test.js
@@ -74,4 +74,8 @@ describe('md tagged template literal', () => {
     };
     assert.strictEqual('Test: b', md`Test: ${v}`);
   });
+
+  it('supports null and undefined', () => {
+    assert.strictEqual('Test: undefined null', md`Test: ${undefined} ${null}`);
+  });
 });