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https://github.com/vercel-labs/scriptc.git
synced 2026-10-02 08:35:07 +08:00
Chris Tate
9e8904ad3b
- The performance global routes through the perf_hooks lowering in all spellings - Response declares its implemented headers/arrayBuffer/bytes surface - Math.max and Math.min lower at any arity - Copy-installed workspace members classify like symlinked ones
19 lines
908 B
TypeScript
19 lines
908 B
TypeScript
// The `performance` GLOBAL — Node exposes node:perf_hooks' performance
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// object with no import, and the global spelling lowers through the same
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// tables as the module export (2427 pins the imported twin): now() reads
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// the process-start-anchored monotonic clock, .bind(performance) is the
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// () => number function value, globalThis.performance is the same object,
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// and a `const perf = performance` snapshot aliases it (the tamper-guard
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// idiom). Raw readings are nondeterministic — print invariants.
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const t0 = performance.now();
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const getTimestamp = performance.now.bind(performance);
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let s = 0;
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for (let i = 0; i < 100000; i++) s += i % 7;
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const t1 = getTimestamp();
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const t2 = globalThis.performance.now();
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const perf = performance;
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const t3 = perf.now();
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console.log(typeof t0, typeof t1, typeof t2, typeof t3);
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console.log(t0 >= 0, t1 >= t0, t2 >= t1, t3 >= t2, t3 < 120000);
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console.log(s);
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