yarn generate-clients -m throws TypeError [ERR_INVALID_ARG_TYPE]

[trivikr]

Describe the bug
yarn generate-clients -m throws TypeError [ERR_INVALID_ARG_TYPE]

SDK version number
master

Details of the browser/Node.js version

$ node -v
v14.2.0

To Reproduce (observed behavior)

• Create a temporary directory

  $ mkdir ~/Downloads/temp

• Copy a model to that directory

  $ cp codegen/sdk-codegen/aws-models/s3.2006-03-01.json ~/Downloads/temp

• Run yarn generate-clients on the temporary directory

  $ yarn generate-clients -m ~/Downloads/temp 

Error thrown:

yarn run v1.22.4
$ node ./scripts/generate-clients -m /home/trivikr/Downloads/temp
preparing models from /home/trivikr/Downloads/temp...
copying model s3.2006-03-01.json...
TypeError [ERR_INVALID_ARG_TYPE]: The "mode" argument must be integer. Received an instance of Object
    at copyFileSync (fs.js:1905:10)
    at generateClients (/local/home/trivikr/workspace/aws-sdk-js-v3/scripts/generate-clients/code-gen.js:23:7)
    at /local/home/trivikr/workspace/aws-sdk-js-v3/scripts/generate-clients/index.js:36:11
    at Object.<anonymous> (/local/home/trivikr/workspace/aws-sdk-js-v3/scripts/generate-clients/index.js:57:3)
    at Module._compile (internal/modules/cjs/loader.js:1176:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1196:10)
    at Module.load (internal/modules/cjs/loader.js:1040:32)
    at Function.Module._load (internal/modules/cjs/loader.js:929:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47 {
  code: 'ERR_INVALID_ARG_TYPE'
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Expected behavior
yarn generate-clients -m succeeds

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