@mapbox/mapbox-gl-supported - npm Package Compare versions

Comparing version 1.4.1 to 1.5.0

index.js

@@ -8,2 +8,3 @@ 'use strict';
     window.mapboxgl.supported = isSupported;
+    window.mapboxgl.notSupportedReason = notSupportedReason;
 }
@@ -20,15 +21,18 @@
 function isSupported(options) {
-    return !!(
-        isBrowser() &&
-        isArraySupported() &&
-        isFunctionSupported() &&
-        isObjectSupported() &&
-        isJSONSupported() &&
-        isWorkerSupported() &&
-        isUint8ClampedArraySupported() &&
-        isArrayBufferSupported() &&
-        isWebGLSupportedCached(options && options.failIfMajorPerformanceCaveat)
-    );
+    return !notSupportedReason(options);
 }
 
+function notSupportedReason(options) {
+    if (!isBrowser()) return 'not a browser';
+    if (!isArraySupported()) return 'insufficent Array support';
+    if (!isFunctionSupported()) return 'insufficient Function support';
+    if (!isObjectSupported()) return 'insufficient Object support';
+    if (!isJSONSupported()) return 'insufficient JSON support';
+    if (!isWorkerSupported()) return 'insufficient worker support';
+    if (!isUint8ClampedArraySupported()) return 'insufficient Uint8ClampedArray support';
+    if (!isArrayBufferSupported()) return 'insufficient ArrayBuffer support';
+    if (!isCanvasGetImageDataSupported()) return 'insufficient Canvas/getImageData support';
+    if (!isWebGLSupportedCached(options && options.failIfMajorPerformanceCaveat)) return 'insufficient WebGL support';
+}
+
 function isBrowser() {
@@ -116,2 +120,15 @@ return typeof window !== 'undefined' && typeof document !== 'undefined';
 
+// Some browsers or browser extensions block access to canvas data to prevent fingerprinting.
+// Mapbox GL uses this API to load sprites and images in general.
+function isCanvasGetImageDataSupported() {
+    const canvas = document.createElement('canvas');
+    canvas.width = canvas.height = 1;
+    const context = canvas.getContext('2d');
+    if (!context) {
+        return false;
+    }
+    const imageData = context.getImageData(0, 0, 1, 1);
+    return imageData && imageData.width === canvas.width;
+}
+
 var isWebGLSupportedCache = {};
@@ -134,4 +151,3 @@ function isWebGLSupportedCached(failIfMajorPerformanceCaveat) {
 
-function isWebGLSupported(failIfMajorPerformanceCaveat) {
-
+function getWebGLContext(failIfMajorPerformanceCaveat) {
     var canvas = document.createElement('canvas');
@@ -161,1 +177,18 @@
 }
+
+function isWebGLSupported(failIfMajorPerformanceCaveat) {
+    const gl = getWebGLContext(failIfMajorPerformanceCaveat);
+    if (!gl) {
+        return false;
+    }
+
+    // Try compiling a shader and get its compile status. Some browsers like Brave block this API
+    // to prevent fingerprinting. Unfortunately, this also means that Mapbox GL won't work.
+    const shader = gl.createShader(gl.VERTEX_SHADER);
+    if (!shader || gl.isContextLost()) {
+        return false;
+    }
+    gl.shaderSource(shader, 'void main() {}');
+    gl.compileShader(shader);
+    return gl.getShaderParameter(shader, gl.COMPILE_STATUS) === true;
+}

package.json

 {
   "name": "@mapbox/mapbox-gl-supported",
-  "version": "1.4.1",
+  "version": "1.5.0",
   "description": "A library to determine if a browser supports Mapbox GL JS",
@@ -5,0 +5,0 @@ "main": "index.js",

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Improved metrics

Total package byte prevSize

16992

increased by7.61%

Lines of code

162

increased by22.73%

Worsened metrics

Number of package files

8

decreased by-11.11%

No dependency changes