Code comments containing "#bun" causes Bun to not parse TypeScript

[dtinth]

What version of Bun is running?

1.1.40+b5b51004e

What platform is your computer?

Darwin 24.1.0 arm64 arm

What steps can reproduce the bug?

Run this:

// https://bun.sh/docs/api/http#bun-serve
const a: string = "hello";
console.log(a);

What is the expected behavior?

Output should be:

hello

What do you see instead?

SyntaxError is thrown:

1 | // https://bun.sh/docs/api/http#bun-serve
2 | const a: string = "hello";
    ^
SyntaxError: Unexpected token ':'. const declared variable 'a' must have an initializer.
      at <parse> (/Users/dtinth/Projects/elysia-by-example/hello.ts:2:1)
      at native:11:43
note: missing sourcemaps for /Users/dtinth/Projects/elysia-by-example/hello.ts
note: consider bundling with '--sourcemap' to get unminified traces

Bun v1.1.40 (macOS arm64)

Additional information

The repro case can be reduced to:

// #bun
const a: string = "hello";
console.log(a);

Without the comment, it works:

const a: string = "hello";
console.log(a);

With the comment not containing #bun, it works:

// https://bun.sh/docs/api/http#fetch-request-handler
const a: string = "hello";
console.log(a);

With the comment containing #bun immediately followed by an alphanumeric character, it works:

// #bunlai
const a: string = "hello";
console.log(a);

[dtinth]

Thanks for a speedy fix! 🙏

[Jarred-Sumner]

We had to revert it due to a regression it caused, but we'll likely get it into the following release