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MIRROR: javascript for 🐜's, a tiny runtime with big ambitions ant.themackabu.dev
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475function 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;});