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Peter Steinberger
1220a7609a
* feat(normalization-core): add promise-like guard * refactor: consolidate promise-like guards * fix(normalization-core): keep isPromiseLike non-throwing on hostile then getters ClawSweeper finding on #121861: the diagnostics-path local guard caught throwing then getters; the canonical guard must classify, never throw. * test(normalization-core): annotate intentional hostile-thenable fixture
14 lines
522 B
TypeScript
14 lines
522 B
TypeScript
/** Canonical thenable guard; use instead of local isPromiseLike copies. */
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export function isPromiseLike<T = unknown>(value: unknown): value is PromiseLike<T> {
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if (value === null || (typeof value !== "object" && typeof value !== "function")) {
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return false;
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}
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// A hostile/exotic object can throw from its `then` getter; a guard must
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// classify, never throw (diagnostics streams rely on this).
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try {
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return typeof (value as { then?: unknown }).then === "function";
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} catch {
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return false;
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}
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}
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