WebGLShader

function createShader(gl, sourceCode, type) {
  // Compiles either a shader of type gl.VERTEX_SHADER or gl.FRAGMENT_SHADER
  const shader = gl.createShader(type);
  gl.shaderSource(shader, sourceCode);
  gl.compileShader(shader);

  if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
    const info = gl.getShaderInfoLog(shader);
    throw new Error(`Could not compile WebGL program. \n\n${info}`);
  }
  return shader;
}

const vertexShaderSource =
  "attribute vec4 position;\n" +
  "void main() {\n" +
  "  gl_Position = position;\n" +
  "}\n";

// Use the createShader function from the example above
const vertexShader = createShader(gl, vertexShaderSource, gl.VERTEX_SHADER);

const fragmentShaderSource = `void main() {
  gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
}
`;

// Use the createShader function from the example above
const fragmentShader = createShader(
  gl,
  fragmentShaderSource,
  gl.FRAGMENT_SHADER,
);