sam
87 lines
2.5 KiB
TypeScript
87 lines
2.5 KiB
TypeScript
/**
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* Check if WebAssembly is supported in the current environment.
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*
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* iOS Lockdown Mode disables WebAssembly, which breaks wallet functionality
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* that relies on the Breez SDK (which uses WASM for cryptographic operations).
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*
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* This function performs a comprehensive check including:
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* 1. Basic WebAssembly object existence
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* 2. Ability to compile a minimal WASM module
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* 3. Ability to instantiate the compiled module
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*/
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export async function checkWasmSupport(): Promise<{
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supported: boolean;
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reason?: string;
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}> {
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try {
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// Check if WebAssembly object exists
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if (typeof WebAssembly !== 'object') {
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return {
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supported: false,
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reason: 'WebAssembly is not available in this browser',
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};
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}
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// Check if required functions exist
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if (
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typeof WebAssembly.compile !== 'function' ||
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typeof WebAssembly.instantiate !== 'function'
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) {
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return {
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supported: false,
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reason: 'WebAssembly compile/instantiate functions are not available',
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};
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}
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// Try to compile and instantiate a minimal WASM module
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// This is the smallest valid WASM module (magic number + version)
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// with an empty section
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const minimalWasmModule = new Uint8Array([
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0x00, 0x61, 0x73, 0x6d, // WASM magic number (\0asm)
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0x01, 0x00, 0x00, 0x00, // WASM version 1
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]);
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const module = await WebAssembly.compile(minimalWasmModule);
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await WebAssembly.instantiate(module);
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return { supported: true };
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} catch (error) {
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// Specific error messages for different failure modes
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const errorMessage = error instanceof Error ? error.message : String(error);
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// Check for common Lockdown Mode error patterns
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if (
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errorMessage.includes('WebAssembly') ||
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errorMessage.includes('wasm') ||
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errorMessage.includes('Lockdown') ||
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errorMessage.includes('disabled')
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) {
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return {
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supported: false,
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reason: 'WebAssembly is disabled (possibly due to iOS Lockdown Mode)',
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};
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}
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return {
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supported: false,
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reason: `WebAssembly check failed: ${errorMessage}`,
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};
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}
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}
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/**
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* Synchronous check for basic WASM support.
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* Use checkWasmSupport() for a more thorough async check.
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*/
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export function hasBasicWasmSupport(): boolean {
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try {
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return (
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typeof WebAssembly === 'object' &&
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typeof WebAssembly.compile === 'function' &&
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typeof WebAssembly.instantiate === 'function'
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);
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} catch {
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return false;
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}
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}
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