create-react-app minify step of build is causing errors at run time

[RossKinsella]

What is wrong?

Code which is working in an un-minified development environment is crashing after creating a build via create-react-app, where the code has been minified and uglified

Where does it happen?

gpu.js 2.10.4

The code which I create inside of the gpu.createKernel function

How do we replicate the issue?

Download source code

• git clone https://github.com/RossKinsella/gpujs-crash

See it working in dev environment

• yarn start
• open localhost:3000
• open your browser console
• click the button, you will see the expected output in the console

See it breaking in a build

• yarn build
• yarn global add serve
• serve -s build
• open localhost:5000
• open your browser console
• click the button, you will see the following error in the console:

  2.dbc4db3a.chunk.js:2 Uncaught Error: Error compiling fragment shader: ERROR: 0:471: 'assign' : cannot convert from 'bool' to 'lowp float'
  ERROR: 0:471: '&&' : wrong operand types - no operation '&&' exists that takes a left-hand operand of type 'lowp float' and a right operand of type 'bool' (or there is no acceptable conversion)
  ERROR: 0:484: '&&' : wrong operand types - no operation '&&' exists that takes a left-hand operand of type 'bool' and a right operand of type 'lowp 2-component vector of float' (or there is no acceptable conversion)

How important is this (1-5)?

5

Expected behavior (i.e. solution)

For the build step to not break the code

Other Comments

Thanks for your hard work on this project.

I spent a few hours looking over the other issues related to minify problems, I think I am running into some other edge case here.

[ted-piotrowski]

I just ran into this. The minifier often does variable assignment/mutation inside of if statements. This is legal javascript but breaks the GPU.js compiler:

if (d = 0) {
  return -1;
}
return 1

Another example:

if (d=0,d+=1,d>0) {
  return d;
}

Error: Error compiling fragment shader: ERROR: 0:478: 'assign' : cannot convert from 'bool' to 'lowp float'