45 lines
1.9 KiB
TypeScript
45 lines
1.9 KiB
TypeScript
// This works by proxying every function call and wrapping a try-catch block to filter out redundant and confusing
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// `RuntimeError: unreachable` exceptions that would normally be printed in the browser's JS console upon a panic.
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export function panicProxy<T extends object>(module: T): T {
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const proxyHandler = {
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get(target: T, propKey: string | symbol, receiver: unknown): unknown {
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const targetValue = Reflect.get(target, propKey, receiver);
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// Keep the original value being accessed if it isn't a function
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const isFunction = typeof targetValue === "function";
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if (!isFunction) return targetValue;
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// Special handling to wrap the return of a constructor in the proxy
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const isClass = isFunction && /^\s*class\s+/.test(targetValue.toString());
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if (isClass) {
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// eslint-disable-next-line func-names
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return function (...args: unknown[]): unknown {
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// All three of these comment lines are necessary to suppress errors at both compile time and while editing this file (@ts-expect-error doesn't work here while editing the file)
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// eslint-disable-next-line @typescript-eslint/ban-ts-comment
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// @ts-ignore
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// eslint-disable-next-line new-cap
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const result = new targetValue(...args);
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return panicProxy(result);
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};
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}
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// Replace the original function with a wrapper function that runs the original in a try-catch block
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// eslint-disable-next-line func-names
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return function (...args: unknown[]): unknown {
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let result;
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try {
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// @ts-expect-error TypeScript does not know what `this` is, since it should be able to be anything
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result = targetValue.apply(this, args);
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} catch (err) {
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// Suppress `unreachable` WebAssembly.RuntimeError exceptions
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if (!`${err}`.startsWith("RuntimeError: unreachable")) throw err;
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}
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return result;
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};
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},
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};
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return new Proxy<T>(module, proxyHandler);
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}
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