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test_async_materialized_stack_slice.cjs
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test_async_materialized_stack_slice.cjs
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function assertEq(actual, expected, message) {
if (actual !== expected) {
throw new Error(`${message}: expected ${expected}, got ${actual}`);
}
}
async function main() {
const trace = [];
async function leaf(label) {
const local = `leaf-${label}`;
trace.push(`leaf-before:${local}`);
const resumed = await new Promise((resolve) => setTimeout(() => resolve(label.toUpperCase()), 0));
trace.push(`leaf-after:${local}:${resumed}`);
return `${local}:${resumed}`;
}
async function middle(label) {
const local = `middle-${label}`;
trace.push(`middle-enter:${local}`);
try {
const value = await leaf(label);
trace.push(`middle-after:${local}:${value}`);
return `${local}:${value}`;
} finally {
trace.push(`middle-finally:${local}`);
}
}
async function top(label) {
const local = `top-${label}`;
trace.push(`top-enter:${local}`);
try {
const value = await middle(label);
trace.push(`top-after:${local}:${value}`);
return `${local}:${value}`;
} finally {
trace.push(`top-finally:${local}`);
await Promise.resolve(local);
trace.push(`top-finally-after-await:${local}`);
}
}
const result = await top('x');
assertEq(
result,
'top-x:middle-x:leaf-x:X',
'nested async result should preserve caller stack state'
);
assertEq(
trace.join(','),
[
'top-enter:top-x',
'middle-enter:middle-x',
'leaf-before:leaf-x',
'leaf-after:leaf-x:X',
'middle-after:middle-x:leaf-x:X',
'middle-finally:middle-x',
'top-after:top-x:middle-x:leaf-x:X',
'top-finally:top-x',
'top-finally-after-await:top-x',
].join(','),
'materialized slice should preserve frames, handlers, and locals above the await'
);
console.log('nested async stack slice resumes with handlers and locals intact');
}
main().catch((err) => {
console.error(err && err.stack ? err.stack : String(err));
throw err;
});

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