Lambda InvokeCommand payload with UInt8Array type

[samirda]

Describe the bug
Produces error when calling InvokeCommand with Payload type UInt8Array

SDK version number
Gamma 6

Is the issue in the browser/Node.js/ReactNative?
Node.js

Details of the browser/Node.js/ReactNative version
v14.5.0

To Reproduce (observed behavior)

await lambda.send(new InvokeCommand({
  FunctionName: '<FunctionName>',
  Payload: new TextEncoder().encode('abc') //Uint8Array
}))

(node:54212) UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "chunk" argument must be of type string or an instance of Buffer. Received an instance of Uint8Array

await lambda.send(new InvokeCommand({
  FunctionName: '<FunctionName>',
  Payload: '"abc"' as any
}))

Works as expected

Expected behavior
Payload with UInt8Array type to not throw error or change Payload type to string | Buffer

[AllanZhengYP]

Hi @samirda This is indeed a bug with our implementation. Because the ClientRequest.end(chunk) was typed as any in @types/node but in fact only string|Buffer is accepted in Node. I will put up a fix shortly.

Actually the easiest way to get around it is using Buffer in Node.js, which is the default binary representation in Node.js. Buffer itself implements Uint8Array interface. We use Uint8Array for binary parameters because its native in any JS runtime.

await lambda.send(new InvokeCommand({
  FunctionName: '<FunctionName>',
  Payload: Buffer.from("abc")
}))

[github-actions]

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