TypeScript: don't use outfile with tsc - it does not support modules

[kdojeteri]

Installing @harnessio/ff-nodejs-server-sdk and importing it in a typescript project results in a typescript error[1]. The is caused by this package being built with tsc --outfile which is not supposed to be used with module files and should only be used for libraries which expose global variables.

To reproduce the error, check out kdojeteri/harness-ff-typescript-error.

This pull request removes the --outfile ./dist/index.d.ts parameter and replaces it with --outdir ./dist, which fixes the error.

[1]

$ tsc --noEmit
index.ts:1:32 - error TS2306: File '/Users/figure/Desktop/test/node_modules/@harnessio/ff-nodejs-server-sdk/dist/index.d.ts' is not a module.

1 import { Client, Logger } from '@harnessio/ff-nodejs-server-sdk'
                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Found 1 error.
error Command failed with exit code 2.