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doc: clarify behavior of napi_extended_error_info #40458

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doc: clarify behavior of napi_extended_error_info #40458

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dfbd981
doc: clarify behavior of napi_extended_error_info
mhdawson Oct 14, 2021
eb18927
fixup: further clarify usage of extended info
mhdawson Oct 18, 2021
6f7499c
Update doc/api/n-api.md
mhdawson Oct 18, 2021
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9 changes: 6 additions & 3 deletions doc/api/n-api.md
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Expand Up @@ -403,12 +403,13 @@ napi_value create_addon(napi_env env);
if (status != napi_ok) { \
const napi_extended_error_info* error_info = NULL; \
napi_get_last_error_info((env), &error_info); \
const char* err_message = error_info->error_message; \
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bool is_pending; \
napi_is_exception_pending((env), &is_pending); \
if (!is_pending) { \
const char* message = (error_info->error_message == NULL) \
const char* message = (err_message == NULL) \
? "empty error message" \
: error_info->error_message; \
: err_message; \
napi_throw_error((env), NULL, message); \
return NULL; \
} \
Expand Down Expand Up @@ -977,7 +978,9 @@ This API retrieves a `napi_extended_error_info` structure with information
about the last error that occurred.

The content of the `napi_extended_error_info` returned is only valid up until
a Node-API function is called on the same `env`.
a Node-API function is called on the same `env`. This includes a call to
`napi_is_exception_pending` so it may often be necessary to make a copy
of the information so that it can be used later.

Do not rely on the content or format of any of the extended information as it
is not subject to SemVer and may change at any time. It is intended only for
Expand Down