From 62b2cf30f2d1326dde9d4bc047f5611f17c4a20f Mon Sep 17 00:00:00 2001 From: Fedor Indutny <238531+indutny@users.noreply.github.com> Date: Mon, 21 Aug 2023 11:12:09 -0700 Subject: [PATCH] doc: clarify use of Uint8Array for n-api `napi_get_buffer_info` always supported receiving `Uint8Array` as a `value` argument because `node::Buffer` is a subclass of `Uint8Array` and the underlying V8 APIs don't distinguish between two. With this change we mark both types as supported by the API so that the user code doesn't have to unknowingly use oficially unsupported type of the `value` argument. PR-URL: https://github.com/nodejs/node/pull/48742 Reviewed-By: Luigi Pinca Reviewed-By: Gabriel Schulhof Reviewed-By: Chengzhong Wu --- doc/api/n-api.md | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/doc/api/n-api.md b/doc/api/n-api.md index 26ca5dc83fb34f..8b8f77f9d6a1f8 100644 --- a/doc/api/n-api.md +++ b/doc/api/n-api.md @@ -3070,13 +3070,18 @@ napi_status napi_get_buffer_info(napi_env env, ``` * `[in] env`: The environment that the API is invoked under. -* `[in] value`: `napi_value` representing the `node::Buffer` being queried. -* `[out] data`: The underlying data buffer of the `node::Buffer`. - If length is `0`, this may be `NULL` or any other pointer value. +* `[in] value`: `napi_value` representing the `node::Buffer` or `Uint8Array` + being queried. +* `[out] data`: The underlying data buffer of the `node::Buffer` or + `Uint8Array`. If length is `0`, this may be `NULL` or any other pointer value. * `[out] length`: Length in bytes of the underlying data buffer. Returns `napi_ok` if the API succeeded. +This method returns the identical `data` and `byte_length` as +[`napi_get_typedarray_info`][]. And `napi_get_typedarray_info` accepts a +`node::Buffer` (a Uint8Array) as the value too. + This API is used to retrieve the underlying data buffer of a `node::Buffer` and its length. @@ -3827,12 +3832,14 @@ napi_status napi_is_buffer(napi_env env, napi_value value, bool* result) * `[in] env`: The environment that the API is invoked under. * `[in] value`: The JavaScript value to check. -* `[out] result`: Whether the given `napi_value` represents a `node::Buffer` - object. +* `[out] result`: Whether the given `napi_value` represents a `node::Buffer` or + `Uint8Array` object. Returns `napi_ok` if the API succeeded. -This API checks if the `Object` passed in is a buffer. +This API checks if the `Object` passed in is a buffer or Uint8Array. +[`napi_is_typedarray`][] should be preferred if the caller needs to check if the +value is a Uint8Array. ### `napi_is_date` @@ -6502,11 +6509,13 @@ the add-on's file name during loading. [`napi_get_last_error_info`]: #napi_get_last_error_info [`napi_get_property`]: #napi_get_property [`napi_get_reference_value`]: #napi_get_reference_value +[`napi_get_typedarray_info`]: #napi_get_typedarray_info [`napi_get_value_external`]: #napi_get_value_external [`napi_has_property`]: #napi_has_property [`napi_instanceof`]: #napi_instanceof [`napi_is_error`]: #napi_is_error [`napi_is_exception_pending`]: #napi_is_exception_pending +[`napi_is_typedarray`]: #napi_is_typedarray [`napi_make_callback`]: #napi_make_callback [`napi_open_callback_scope`]: #napi_open_callback_scope [`napi_open_escapable_handle_scope`]: #napi_open_escapable_handle_scope