Why does node.js not recognize lv_img_conv as a module?

[karunt]

I'm working on an app that connects to ESP32-S3 and need to convert image files before sending them over to the ESP32-S3 chip. The app is ionic based and uses node/express.js. Is there a way to incorporate this library in node so it behaves like a node_module? ie, so I could just import cli.ts functions and execute them as part of my express code? If not, any idea how this could be converted so the main functions can be called from node?

[karunt]

Working on Windows 11 64 bit platform. Successfully Installed lv_img_conv with npm along with global installation of typescript and ts-node. Also installed canvas with its native dependencies (including cairo, gtx and libjpeg-turbo64). But when I try to import convertAllImages from lv_img_conv (const cli = require('lv_img_conv');), I get a node error saying

Cannot find module 'lv_img_conv'

Any idea why that's happening? Appreciate some guidance on how to use this module in my node.js application. I'm using node version 23.8

[karunt]

Absent other options, trying to run the ts-node command in node.js using child-process.spawn("ts-node", ["./../external_libraries/lv_img_conv-master/lib/cli.ts", srcFile, "-f", "-o", destFile, "-c", "CF_TRUE_COLOR_ALPHA", "-t", "bin", "--binary-format", "ARGB8565"]);

But I keep on getting

spawn ts-node ENOENT

error messages. Any idea why or how to fix this? Really at a loss on how to make this library work so I can convert my jpeg images programmatically at run time.

[karunt]

Finally got ts-node to work in node.js (v 23.8.0). Make sure @swc/core is installed in node_modules - lv_img_conv requires it as a transpiler and it doesn't come with ts-node by default. Here's the code:

const { spawn } = require('child_process');
const convert = spawn("npx ts-node ./node_modules/lv_img_conv/lib/cli.ts ./Images/File100.jpeg",
                    ["-f", "-o", "./Images/File100.bin", "-c", "CF_TRUE_COLOR_ALPHA", "-t", "bin", "--binary-format", "ARGB8565"],
                    {shell: true}
                );

But it would still be nicer if there were a way to incorporate lv_img_conv directly into node.js by requiring it rather than having to depend on ts-node.