ts-node console.trace prints `[object Object]` for strings

[raymondfeng]

With a very simple t.ts as follows:

console.trace('a');

$ ts-node t

[object Object]
    at Object.<anonymous> (/private/tmp/t.js:2:9)
    at Module._compile (module.js:624:30)
    at Object.Module._extensions..js (module.js:635:10)
    at Module.load (module.js:545:32)
    at tryModuleLoad (module.js:508:12)
    at Function.Module._load (module.js:500:3)
    at Function.Module.runMain (module.js:665:10)
    at Object.<anonymous> (/Users/rfeng/.nvm/versions/node/v8.6.0/lib/node_modules/ts-node/src/_bin.ts:182:12)
    at Module._compile (module.js:624:30)
    at Object.Module._extensions..js (module.js:635:10)

Please note [object Object] is printed out instead of a.

tsc compiles the code to console.trace('a'); and it works as expected.

BTW, console.log does NOT have the same issue.

[blakeembrey]

I'd suggest making the issue over at https://github.com/evanw/node-source-map-support. I can replicate it with source map support enabled (default) and it's resolved when disabled.

[blakeembrey]

I can also make the issue if you don't want to, just let me know 😄

[blakeembrey]

For the interim, if this is urgent, would you like a flag that can disable source map support?

[raymondfeng]

@blakeembrey Can you explain why this issue has to do with https://github.com/evanw/node-source-map-support? It's not about the stacktrace, but the printed out value of a string.

[blakeembrey]

See my message when I closed the issue. The output only happens with source map support enabled, it doesn’t happen if it’s disabled (e.g. commented out).

[raymondfeng]

@blakeembrey Thanks for the explanation. Do you mind opening an issue against https://github.com/evanw/node-source-map-support? You are closer to that code :-).

[blakeembrey]

Sure, no problem. I haven't had a chance to investigate why just yet, but I imagine the same issue is happing on all projects using source-map-support (e.g. Babel and CoffeeScript also). Opening it now, will link back to here.