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n-api: create napi_env as a real structure
1. We define struct napi_env__ to include the isolate, the last exception, and the info about the last error. 2. We instantiate one struct napi_env__ during module registration and we pass it into the FunctionCallbackInfo for all subsequent entries into N-API when we create functions/accessors/finalizers. Once module unloading will be supported we shall have to delete the napi_env we create during module init. There is a clear separation between public and private API wrt. env: 1. Public APIs assert that env is not nullptr as their first action. 2. Private APIs need not validate env. They assume it's not nullptr. PR-URL: #12195 Fixes: nodejs/abi-stable-node#198 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
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