CODEWITHSUNDEEP
javascriptnode.jstypescriptasynchronous
ubershmekel
ubershmekel

Reputation: 12818

How can I get async stack traces with Node and TypeScript?

I wish I could get stack traces to work in TypeScript. I only seem to see the bottommost function name. I'm using Node.js v12.4.0 on Windows 10 (1803).

This is the code:

async function thrower() {
  throw new Error("test");
}

async function level1() {
  return await thrower();
}

async function level2() {
  return await level1();
}

async function level3() {
  return await level2();
}

async function main() {
  try {
    await level3();
  } catch(err) {
    console.warn("main error", err);
  }
}

console.log("node version", process.version);

main().then(() => {
  console.log("all done " + __filename);
}).catch((err) => {
  console.error("Something went wrong in here :(", __filename, err);
})

The resulting stack trace that does not mention level1 or level2 or level3:

ts-node test-stack.ts
node version v12.4.0
main error Error: test
    at D:\dev\server\test-stack.ts:2:9
    at step (D:\dev\server\test-stack.ts:31:23)
    at Object.next (D:\dev\server\test-stack.ts:12:53)
    at D:\dev\server\test-stack.ts:6:71
    at new Promise (<anonymous>)
    at __awaiter (D:\dev\server\test-stack.ts:2:12)
    at thrower (D:\dev\server\test-stack.ts:37:12)
    at D:\dev\server\test-stack.ts:6:16
    at step (D:\dev\server\test-stack.ts:31:23)
    at Object.next (D:\dev\server\test-stack.ts:12:53)
all done D:\dev\server\test-stack.ts

Upvotes: 6

Views: 3481

Answers (1)

ubershmekel
ubershmekel

Reputation: 12818

After some research and noticing the __awaiter, I decided to inspect what's TypeScript targeting. That was my problem.

Here's my bad tsconfig.json:

{
    "compilerOptions": {
      "experimentalDecorators": true,
      "emitDecoratorMetadata": true,
      "downlevelIteration": true,
    },
    "include": [
        "server/**/*", "tests"
    ],
    "exclude": [
        "node_modules",
        "**/*.spec.ts"
    ]
}

And this "target": "es2018" fixed it:

{
    "compilerOptions": {
      "experimentalDecorators": true,
      "emitDecoratorMetadata": true,
      "downlevelIteration": true,
      "target": "es2018"
    },
    "include": [
        "server/**/*", "tests"
    ],
    "exclude": [
        "node_modules",
        "**/*.spec.ts"
    ]
}

Resulting in this stack trace:

ts-node test-stack.ts
node version v12.4.0
main error Error: test
    at thrower (D:\dev\server\test-stack.ts:2:9)
    at level1 (D:\dev\server\test-stack.ts:6:16)
    at level2 (D:\dev\server\test-stack.ts:10:16)
    at level3 (D:\dev\server\test-stack.ts:14:16)
    at main (D:\dev\server\test-stack.ts:19:11)
    at Object.<anonymous> (D:\dev\server\test-stack.ts:27:1)
    at Module._compile (internal/modules/cjs/loader.js:774:30)
    at Module.m._compile (C:\Users\yuv\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:439:23)
    at Module._extensions..js (internal/modules/cjs/loader.js:785:10)
    at Object.require.extensions.<computed> [as .ts] (C:\Users\yuv\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:442:12)
all done D:\dev\server\test-stack.ts

Upvotes: 8

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