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try {
// This should throw.
if (construct) {
// Something should be setting the props in the constructor.
var Fake = function () {
throw Error();
}; // $FlowFixMe
Object.defineProperty(Fake.prototype, "props", {
set: function () {
// We use a throwing setter instead of frozen or non-writable props
// because that won't throw in a non-strict mode function.
throw Error();
},
});
if (typeof Reflect === "object" && Reflect.construct) {
// We construct a different control for this case to include any extra
// frames added by the construct call.
try {
Reflect.construct(Fake, []);
} catch (x) {
control = x;
}
Reflect.construct(fn, [], Fake);
} else {
try {
Fake.call();
} catch (x) {
control = x;
}
fn.call(Fake.prototype);
}
} else {
try {
throw Error();
} catch (x) {
control = x;
}
fn();
}
} catch (sample) {
// This is inlined manually because closure doesn't do it for us.
if (sample && control && typeof sample.stack === "string") {
// This extracts the first frame from the sample that isn't also in the control.
// Skipping one frame that we assume is the frame that calls the two.
var sampleLines = sample.stack.split("\n");
var controlLines = control.stack.split("\n");
var s = sampleLines.length - 1;
var c = controlLines.length - 1;
while (s >= 1 && c >= 0 && sampleLines[s] !== controlLines[c]) {
// We expect at least one stack frame to be shared.
// Typically this will be the root most one. However, stack frames may be
// cut off due to maximum stack limits. In this case, one maybe cut off
// earlier than the other. We assume that the sample is longer or the same
// and there for cut off earlier. So we should find the root most frame in
// the sample somewhere in the control.
c--;
}
for (; s >= 1 && c >= 0; s--, c--) {
// Next we find the first one that isn't the same which should be the
// frame that called our sample function and the control.
if (sampleLines[s] !== controlLines[c]) {
// In V8, the first line is describing the message but other VMs don't.
// If we're about to return the first line, and the control is also on the same
// line, that's a pretty good indicator that our sample threw at same line as
// the control. I.e. before we entered the sample frame. So we ignore this result.
// This can happen if you passed a class to function component, or non-function.
if (s !== 1 || c !== 1) {
do {
s--;
c--; // We may still have similar intermediate frames from the construct call.
// The next one that isn't the same should be our match though.
if (c < 0 || sampleLines[s] !== controlLines[c]) {
// V8 adds a "new" prefix for native classes. Let's remove it to make it prettier.
var _frame = "\n" + sampleLines[s].replace(" at new ", " at ");
{
if (typeof fn === "function") {
componentFrameCache.set(fn, _frame);
}
} // Return the line we found.
return _frame;
}
} while (s >= 1 && c >= 0);
}
break;
}
}
}
} finally {
reentry = false;
{
ReactCurrentDispatcher$1.current = previousDispatcher;
reenableLogs();
}
Error.prepareStackTrace = previousPrepareStackTrace;
} // Fallback to just using the name if we couldn't make it throw.
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