Start NodeJS runtime in AWS lambda with a specific option or environment variable

Question

Getting NodeJS deprecation error when execute an AWS Lambda (using node 12.x):

[DEP0066] DeprecationWarning: OutgoingMessage.prototype._headers is deprecated

can not find which module/piece of code is producing it. Nothing seems to reference _headers or _headerNames.

In Node should be possible to set a parameter or environment variable as explain here to --trace-deprecation and/or --trace-warnings and/or --throw-deprecation. When setting one or multiple of these values in AWS Console Environment variables for the lambda, no extra information is displayed.

What is the way to set this runtime parameter for an AWS Lambda? Is there a way to catch the stack trace to know where is the deprecated error happening?

hard to say anything without looking at what code you have inside your lambda function — Ashish Modi
– Ashish Modi, Commented Mar 5, 2020 at 13:55
Hi @riga, looks that one of your dependencies are using the deprecated _headers ( nodejs.org/api/… ), can you post the code ? — pepo
– pepo, Commented Mar 5, 2020 at 16:41
Hi @riga, Oks. For enable the tracing you can use the NODE_OPTIONS env variable like this NODE_OPTIONS='--trace-deprecation'' (nodejs.org/api/cli.html#cli_node_options_options) — pepo
– pepo, Commented Mar 5, 2020 at 17:27
Hi @riga, I just made a quick test ( gist.github.com/pepoviola/aaba2d7af4d1b443b37e109f2702e358 ) setting that env variable and works as expected. Also, you can use process.on('warning', warning => console.log( warning.stack ) ); to console.log the stack. — pepo
– pepo, Commented Mar 5, 2020 at 19:05

Ricardo stands with Ukraine · Accepted Answer · 2020-03-09 11:53:37Z

3

feliz de ayudar! I pasted the snippet for the future.

set the flag in webpack.config.js code as explained here

process.traceDeprecation = true;

module.exports = {
  // Your config
};

If the deprecation error is in a function you can do: (even any defeats purpose of Typescript, is just for locating the problem, to be removed after)

(process as any).traceDeprecation = true;

also can check the value

exports.handler = async (event) => {
    console.log( 'process.traceDeprecation', process.traceDeprecation );
    Buffer(1);
    process.on('warning', (warning) => {
        console.log( 'stack of deprecation' );
        console.log(warning.stack);
    });    
};

Thanks!

edited Mar 9, 2020 at 11:53

Ricardo stands with Ukraine

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answered Mar 6, 2020 at 15:49

pepo

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