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cache the result of isAppleSilicon() #1828

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Merged
merged 3 commits into from
Jul 21, 2025
Merged

cache the result of isAppleSilicon() #1828

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bc6b752
cache the result of isAppleSilicon()
muodov Jul 17, 2025
cbc34ab
Lint fix
muodov Jul 17, 2025
258c956
Fix the value calculation
muodov Jul 17, 2025
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11 changes: 9 additions & 2 deletions injected/src/utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@ let globalObj = typeof window === 'undefined' ? globalThis : window;
let Error = globalObj.Error;
let messageSecret;

let isAppleSiliconCache = null;

// save a reference to original CustomEvent amd dispatchEvent so they can't be overriden to forge messages
export const OriginalCustomEvent = typeof CustomEvent === 'undefined' ? null : CustomEvent;
export const originalWindowDispatchEvent = typeof window === 'undefined' ? null : window.dispatchEvent.bind(window);
Expand Down Expand Up @@ -258,13 +260,18 @@ export function camelcase(dashCaseText) {

// We use this method to detect M1 macs and set appropriate API values to prevent sites from detecting fingerprinting protections
function isAppleSilicon() {
// Cache the result since hardware doesn't change
if (isAppleSiliconCache !== null) {
return isAppleSiliconCache;
}
const canvas = document.createElement('canvas');
const gl = canvas.getContext('webgl');

// Best guess if the device is an Apple Silicon
// https://stackoverflow.com/a/65412357
// @ts-expect-error - Object is possibly 'null'
return gl.getSupportedExtensions().indexOf('WEBGL_compressed_texture_etc') !== -1;
const compressedTextureValue = gl?.getSupportedExtensions()?.indexOf('WEBGL_compressed_texture_etc');
isAppleSiliconCache = typeof compressedTextureValue === 'number' && compressedTextureValue !== -1;
return isAppleSiliconCache;
}

/**
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