Invalid use of syntax `??` and `||=`

[catamphetamine]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

In Node.js 10, 12:

/home/runner/work/node-unzipper/node-unzipper/node_modules/@aws-sdk/client-s3/dist-cjs/index.js:25
        useFipsEndpoint: options.useFipsEndpoint ?? false,
                                                  ^

SyntaxError: Unexpected token ?

In Node.js 14:

/home/runner/work/node-unzipper/node-unzipper/node_modules/@aws-sdk/core/dist-cjs/submodules/client/index.js:71
Retry.v2026 ||= typeof process === "object" && process.env?.AWS_NEW_RETRIES_2026 === "true";
            ^^^

SyntaxError: Unexpected token '||='

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/client-s3@3.1074.0

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

10, 12, 14

Reproduction Steps

import or require() @aws-sdk/client-s3 package

Observed Behavior

Throws the errors

Expected Behavior

Not throws the errors

Possible Solution

No response

Additional Information/Context

No response

[aBurmeseDev]

Hi @catamphetamine, Node 10, 12, and 14 are all end-of-life, and the JS SDK v3 dropped support for them well before that. The current support node version is >=20.0.0, and we'll be moving the floor to Node 22 in January 2027 (see announcement).

Can you help me understand a bit more about what you're trying to achieve here?

[catamphetamine]

Well announcements are fine but why no 'engines' field in 'package.json' then. Not everyone tracks the announcement history.

[kuhe]

You can see the engines field using https://www.npmjs.com/package/@aws-sdk/client-s3?activeTab=code.

It says

  "engines": {
    "node": ">=20.0.0"
  },

[catamphetamine]

I see, so it’s not in github repo but somehow in npm package. Ok then, this issue can be closed.

…

On Tue, 23 Jun 2026 at 17:54, George Fu ***@***.***> wrote: *kuhe* left a comment (aws/aws-sdk-js-v3#8120) <#8120 (comment)> You can see the engines field using ***@***.***/client-s3?activeTab=code. It says "engines": { "node": ">=20.0.0" }, — Reply to this email directly, view it on GitHub <#8120?email_source=notifications&email_token=AADUP34VNJQECOIL6ETQI5L5BKK4BA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZYGA2DQNJWGE22M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-4780485615>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AADUP37BDHSGYEEHARRLXA35BKK4BAVCNFSNUABEKJSXA33TNF2G64TZHM4DOMRSHAYDSMB3JFZXG5LFHM2DOMRRGQ3DKMBUGCQXMAQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[kuhe]

The engines field is also on github: https://github.com/aws/aws-sdk-js-v3/blob/main/clients/client-s3/package.json#L56-L58

[github-actions]

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