One more fun function serialization problem ``` import promi Pulumi Community #typescript

One more fun function serialization problem! ``` ...

wonderful-bird-78843

05/02/2022, 11:03 PM

One more fun function serialization problem!

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import { promisify } from "util";
import { execFile as execFileReal } from 'child_process';

const execFile = promisify(execFileReal);

and then in a sns

Topic.onEvent()

I'm doing:

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try {
            const { stdout } = await execFile('curl', args);
            console.log("stdout:", stdout);
            msg.Response = stdout;
}

up

, I'm getting:

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Diagnostics:
  pulumi:pulumi:Stack (mcurl-typescript-mcurl):
    error: Error serializing '(ev, ctx) => __awaiter(this, void 0, ...': index.ts(137,57)

    '(ev, ctx) => __awaiter(this, void 0, ...': index.ts(137,57): captured
      'execFile', a function defined at
        '(...args) => { const { promise, reso ...': node:child_process(231,9): which captured
          'orig', a function defined at
            function 'execFile': node:child_process(278,17): which captured
              'ArrayIsArray', a function defined at
                function 'isArray': which could not be serialized because
                  it was a native code function.

wonderful-bird-78843

05/02/2022, 11:05 PM

https://www.pulumi.com/docs/intro/concepts/function-serialization/#capturing-modules-in-a-javascript-function

wonderful-bird-78843

05/02/2022, 11:06 PM

This seems to suggest that the import from

child_process

should just be serialized into an import on the server, no?

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For the reasons cited previously, modules are captured in a special but intuitive fashion. When a module is captured in code, it is translated into an idiomatic require call in the serialized JavaScript code.

wonderful-bird-78843

05/02/2022, 11:07 PM

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This form of module capturing only applies to external modules that are referenced, such as modules that are directly part of Node, or are in the node_modules directory.

wonderful-bird-78843

05/02/2022, 11:07 PM

Am I missing something?

wonderful-bird-78843

05/02/2022, 11:09 PM

ahh, bah... I moved the

const execFile = promisify(execFileReal);

into the callback, and that fixed it

wonderful-bird-78843

05/02/2022, 11:09 PM

is this a bug?

Open in Slack

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