filer.js | wrapper library for the HTML5 Filesystem API | File Utils library

When you open this file in the Browser you need to look into the "Developer Tools" to find the error in the console (If you don't know how to do that: try right-clicking on your webpage and select "inspect" from the context menu)

The console will show you:

perf_hooks is indeed in that version of Node.js. In 14.8.0, require() throws MODULE_NOT_FOUND (and not ENOENT) when it can't find a module, so the problem is something else.

If it is definitely the require() line that is throwing, then it seems likely that require() has been monkey-patched. If they patched require() but not module.require(), you can try changing require() to module.require() in lib/profiler.js.

EDIT: As OP suggests, sandboxed-module is a likely culprit since it messes with module loading. They report that it's fixed in 2.0.4, but based on the repository information on the fix, it would appear to be fixed in 2.0.1. Either way, updating to 2.0.4 (or later, but that's the latest as of this writing) is 👍.

The problem is that you're not setting the background colour, so the JPG is defaulting to black, which means that the whole image is black, because it can't handle transparency.

It's not a problem for PNG or SVG, which is why these work as expected.

To fix it set the background colour of the signature pad to white (taken from the signature pad example):

This seems like a regression bug in tronbox 2.7.4 and 2.7.5 since when I use tronbox 2.5.2 everything works smoothly.

I closely inspect my First error

Failed running "C:/Program Files/Unity2018.2.10/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\python.exe" "C:/Program Files/Unity2018.2.10/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\Emscripten\emcc" @"D:@TLL_Projects\WebGLAndBroswerJSInteraction\Assets..\Temp\emcc_arguments.resp"

stdout: stderr:WARNING:root:--separate-asm works best when compiling to HTML. Otherwise, you must yourself load the '.asm.js' file that is emitted separately, and must do so before loading the main '.js' file. [-Wseparate-asm] error: failure to execute js library "D:@TLL_Projects\WebGLAndBroswerJSInteraction\Assets\Plugins\ExternalJSMethod.jslib": ReferenceError: margeInto is not defined,,ReferenceError: margeInto is not defined at eval (eval at load (eval at globalEval (C:\Program . .. . .so on

and found that the problem is here

ReferenceError: margeInto is not defined,,ReferenceError: margeInto is not defined at eval (eval at load

Actually it is mergeInto not margeInto, by replacing the syntax error i am able to build successfully.

As of Truffle 5.0.0 beta -0, you can specify a solcjs version.

I have just tried it in my project and it works. Be sure to make the version number a string and use the following code:

Files can be accessed like this:

$request->allFiles();

To get a single file:

$request->file('key');