`bun build --compile` sourcemaps don't work

[paperdave]

Reproduction from #12571, should still reproduce if instead of the genuine bundler error, you place a manual throw new Error into the code

[FelixZY]

I'm assuming you are reporting just what I ran into.

Documentation states:

When deploying to production, we recommend the following:

bun build --compile --minify --sourcemap ./path/to/my/app.ts --outfile myapp

So I created test.ts:

function main() {
  throw new Error("test");
}

main();

and did the following:

$ bun test.ts
1 | function main() {
2 |   throw new Error("test");
            ^
error: test
      at main (/workspaces/dansdata/backend/test.ts:2:9)
      at /workspaces/dansdata/backend/test.ts:5:1

Bun v1.1.21 (Linux x64)

$ bun build --compile --target=bun-linux-x64-modern --minify --sourcemap ./test.ts --outfile ./test
   [4ms]  minify
   [1ms]  bundle  1 modules
  [78ms] compile  ./test

$ ./test
2 | function n(){throw new Error("test")}n();
                       ^
error: test
      at n (/$bunfs/root/test:2:20)
      at /$bunfs/root/test:2:39

Bun v1.1.21 (Linux x64)

As you can see, the stack trace is printed in minifed form from the executable which is unexpected.

[paperdave]

i thought this was a regression from my recent changes but i can't find a version where this properly worked. on it

[FelixZY]

@paperdave I just verified this on 1.1.24 and while the stack trace is definitely better now, there's still something not working quite right:

test.ts

function recurse(n: number) {
  if (n === 0) throw new Error("test");
  else recurse(n - 1);
}

function main() {
  recurse(5);
}

main();

Running the .ts file directly:

$ bun ./test.ts 
1 | function recurse(n: number) {
2 |   if (n === 0) throw new Error("test");
                         ^
error: test
      at recurse (/workspaces/dansdata/backend/test.ts:2:22)
      at recurse (/workspaces/dansdata/backend/test.ts:3:8)
      at recurse (/workspaces/dansdata/backend/test.ts:3:8)
      at recurse (/workspaces/dansdata/backend/test.ts:3:8)
      at recurse (/workspaces/dansdata/backend/test.ts:3:8)
      at recurse (/workspaces/dansdata/backend/test.ts:3:8)
      at main (/workspaces/dansdata/backend/test.ts:7:3)
      at /workspaces/dansdata/backend/test.ts:10:1

Bun v1.1.24 (Linux x64)

Running on the compiled source file:

$ bun build --compile --target=bun-linux-x64-modern --minify --sourcemap ./test.ts --outfile ./test
   [3ms]  minify
   [0ms]  bundle  1 modules
  [73ms] compile  ./test
$ ./test 
1 | function recurse(n: number) {
2 |   if (n === 0) throw new Error("test");
                         ^
error: test
      at r (test.ts:2:22)
      at r (test.ts:3:8)
      at r (test.ts:3:8)
      at r (test.ts:3:8)
      at r (test.ts:3:8)
      at r (test.ts:3:8)
      at n (test.ts:7:3)
      at test.ts:10:1

Bun v1.1.24 (Linux x64)

as you can see, the stack trace still uses the minifed function name (at r (...) rather than the original name (at recurse (...).