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Questions tagged [node-nan]

10 questions
3
votes
1 answer

How to use Maybe version of v8::String::NewFromUtf8?

I'm trying to build a native node module against Node 12 and am getting errors such as: warning: ‘static v8::Local v8::String::NewFromUtf8(v8::Isolate*, const char*, v8::String::NewStringType, int)’ is deprecated: Use maybe version…
logidelic
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2
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1 answer

how to implement node-nan callback using node-addon-api

Until now I've only implemented synchronous node-addon-api methods, i.e., a JavaScript function makes a call, work is done, and the addon returns. I have big gaps in knowledge when it comes to the inner workings of v8, libuv, and node, so please…
bmacnaughton
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2
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2 answers

How to check in an node.js C++ addon, if a promise is resolved

The Task: I call a callback from C++ that return a v8::Promise (so an async function). Now I want to find out if the promise was resolved. For this example here, I want to check from JS if the promise is resolved. But "just beeing informed in the…
GerritP
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2
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1 answer

Handling JavaScript objects in a C++ node nan addon

My code is passing a JavaScript object to a function implemented in C++. The C++ code needs to validate the type of each property and supply a default value if either the property is missing or the type is wrong. The following code seems to work…
bmacnaughton
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1
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1 answer

How to check a napi_value of type napi_number is an integer or decimal by using node.js N-API function,

How to check a given napi_value of type napi_number is an integer or decimal (a number with fractional value) by using node.js native N-API function . Look like there is no isInt() or isDouble() equivalent function in N-API (we don’t want to use V8…
Satyan
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1
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1 answer

Node addon compilation error

I am new to creating c++ addons for node. I've instaled windows-build-tools and after running node-gyp build I've encountered a strange problem. I tryed to do some research before asking this question but it seams there is no clear answer. I've…
Maciej Kozieja
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0 answers

how does two argument constructor get called in nodejs addon?

I'm new to nodejs addons and am learning on the fly working with existing code. I have a situation where I don't understand how a specific C++ constructor is being called nor how the value of an argument is being set. There are two pure C++…
bmacnaughton
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0
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0 answers

Should I check NODE_MODULE_VERSION or V8_MAJOR_VERSION/V8_MINOR_VERSION?

I'm working on a native module for Node.js and I see that there's two ways to check which V8 version it's being run on: #if (V8_MAJOR_VERSION < 9 || (V8_MAJOR_VERSION == 9 && V8_MINOR_VERSION < 4)) or #if defined NODE_MODULE_VERSION &&…
Boris Verkhovskiy
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0
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1 answer

NODE N-API When using functions from addon blocks the main process node js?

Implemented a wrapper for the function using N-API. It works, but the problem is that when it works the main thread of the node does not work? How can I rewrite this function so that it does not block the main thread? What do I need to use async,…
saper639
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1 answer

TypeError: [c++ addon class] is not a constructor

TypeError: m.Default is not a constructor is the error I'm getting when I try to make a JavaScript class by using NAN. Here's what I'm doing: //AudioDeviceController.h #pragma once #include class Default : public Nan::ObjectWrap { public: …
Jack
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