HTML tagged template fails silently

[bartlomieju]

Version: Deno 2.3.1

// main.ts
const content = html`<main>
            <h1>
Hello 
<h1></main>
`;

$ deno fmt main.ts

Nothing happens.

Let's do the same thing in an HTML file:

<!-- index.html --->
<main>
            <h1>
Hello 
<h1></main>

$ deno fmt index.html
Error formatting: /Users/ib/dev/deno_v2.3_livestream/index.html
   Syntax error (expected close tag) at file:///Users/ib/dev/deno_v2.3_livestream/index.html:5:0

error: Failed to format 1 of 1 checked file

When formatting broken HTML inside JS/TS file we should raise the error too.

[bartlomieju]

I did a little bit of investigation and concluded that it's dprint-plugin-typescript that requires changes - currently the external_formatter is expected to return Option<String>, but I believe it should be Result<Option<String>, ...> so that errors can be properly propagated

[kt3k]

@bartlomieju I've been doing some experiment in dprint/dprint-plugin-typescript#710