error TS2304: Cannot find name 'TransformStream'

Question

I'm trying to build my socket.io code which used to build well, but now I don't know what changes caused the project build to give an error. Apparently, TransformStream, one of the built-in libraries of node, cannot be loaded in Typescript

node_modules/engine.io-parser/build/esm/index.d.ts:6:54 - error TS2304: Cannot find name 'TransformStream'.

6 export declare function createPacketEncoderStream(): TransformStream<Packet, any>;
                                                       ~~~~~~~~~~~~~~~

node_modules/engine.io-parser/build/esm/index.d.ts:7:96 - error TS2304: Cannot find name 'TransformStream'.

7 export declare function createPacketDecoderStream(maxPayload: number, binaryType: BinaryType): TransformStream<Uint8Array, any>;
                                                                                                 ~~~~~~~~~~~~~~~

If I put the following line in the part

node_modules/engine.io-parser/build/esm/index.d.ts:6:54

If I enter it, the error will be fixed, but this is not a correct way.

import { TransformStream } from "stream/web";

I also tried node in "types" tsconfig.json, but it didn't help

What's the version of typescript according to package.json? — 0xts
– 0xts, Commented Aug 4, 2023 at 16:53

krendus · Accepted Answer · 2023-11-11 12:18:07Z

6

Downgrading it fixed the issues for me

npm i [email protected]

answered Nov 11, 2023 at 12:18

krendus

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mirobr0wn · Accepted Answer · 2023-08-06 10:21:41Z

4

I had run into same issue. I've found that the issue is with changes done in [email protected] and above.

https://github.com/socketio/engine.io-parser/compare/5.1.0...5.2.0

Seems they introduced TransformStream there. For now I've moved back to fixed [email protected] and set resolutions to [email protected]

// package.json
    ....
    "resolutions": {
        "engine.io": "6.5.1"
    }

answered Aug 6, 2023 at 10:21

mirobr0wn

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1 Comment

jds210 Over a year ago

Related to this bug in engine.io github.com/socketio/engine.io-parser/issues/136 and this pull request in DefinitelyTyped: github.com/DefinitelyTyped/DefinitelyTyped/pull/66710

Sam A. · Accepted Answer · 2023-08-17 15:32:49Z

1

I ran into the same issue after upgrading socketio and typescript to @latest. I had to add "dom" to the lib array in tsconfig.json so that typescript includes the dom library files in the compilation.

// tsconfig.json
....
"lib": [
    ....
    "dom",
]

answered Aug 17, 2023 at 15:32

Sam A.

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devjs1000 · Accepted Answer · 2023-10-30 18:35:16Z

1

this worked for me in the tsconfig add it like this "lib": ["ESNext", "DOM"],

answered Oct 30, 2023 at 18:35

devjs1000

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