files/en-us/web/api/gpushadermodule/getcompilationinfo/index.md
{{APIRef("WebGPU API")}}{{SecureContext_Header}}{{AvailableInWorkers}}
The getCompilationInfo() method of the
{{domxref("GPUShaderModule")}} interface returns a {{jsxref("Promise")}} that fulfills with a {{domxref("GPUCompilationInfo")}} object containing messages generated during the GPUShaderModule's compilation.
getCompilationInfo()
None.
A {{jsxref("Promise")}} that fulfills with a {{domxref("GPUCompilationInfo")}} object.
{{domxref("GPUCompilationInfo")}} contains a messages property, which is an array of {{domxref("GPUCompilationMessage")}} objects, each one containing the details of an individual compilation message.
In the example below, we have deliberately left a parenthesis out of a function declaration in our shader code:
const shaders = `
struct VertexOut {
@builtin(position) position : vec4f,
@location(0) color : vec4f
}
@vertex
fn vertex_main(@location(0) position: vec4f,
@location(1) color: vec4f -> VertexOut
{
var output : VertexOut;
output.position = position;
output.color = color;
return output;
}
@fragment
fn fragment_main(fragData: VertexOut) -> @location(0) vec4f
{
return fragData.color;
}
`;
When we compile the shader module, we use getCompilationInfo() to grab some information about the resulting error:
async function init() {
// …
const shaderModule = device.createShaderModule({
code: shaders,
});
const shaderInfo = await shaderModule.getCompilationInfo();
const firstMessage = shaderInfo.messages[0];
console.log(firstMessage.lineNum); // 9
console.log(firstMessage.message); // "expected ')' for function declaration"
console.log(firstMessage.type); // "error"
// …
}
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