Render: ability to compose --to all with other formats (e.g. --to all,json)

Author: jjallaire

news/changelog-1.2.md

@@ -77,6 +77,7 @@
 
 ## Miscellaneous
 
+- Render: ability to compose `--to all` with other formats (e.g. `--to all,json`)
 - Don't call Deno.realPathSync on Windows (avoid problems w/ UNC paths)
 - Don't include Unicode literals on Windows directly (#2184), thanks @yihui
 - Improve YAML validation error messages on values of type object (#2191)

src/command/render/render-contexts.ts

@@ -123,12 +123,19 @@ export async function resolveFormatsFromMetadata(
 
   // determine render formats
   const renderFormats: string[] = [];
-  if (flags?.to === undefined || flags?.to === "all") {
+  if (flags?.to === undefined) {
     renderFormats.push(...formats);
   } else if (flags?.to === "default") {
     renderFormats.push(formats[0]);
   } else {
-    renderFormats.push(...flags.to.split(","));
+    const toFormats = flags.to.split(",").flatMap((to) => {
+      if (to === "all") {
+        return formats;
+      } else {
+        return [to];
+      }
+    });
+    renderFormats.push(...toFormats);
   }
 
   const resolved: Record<string, Format> = {};