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Devin Zuczek
20 lines
991 B
TypeScript
20 lines
991 B
TypeScript
/**
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* Read an integer worker var, falling back to `fallback` when it is unset or unusable.
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*
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* A var arrives as a number when it's declared in wrangler.jsonc `vars`, but as a string
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* when it's set anywhere else (the dashboard, `wrangler deploy --var`, `.dev.vars`), so
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* both have to be accepted — the same var is a different type depending on where the
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* operator set it.
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*
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* Anything that isn't a finite integer (an empty string, a typo, `3.5`) is treated as
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* unset rather than coerced: `Number.parseInt` would read `"3abc"` as 3 and `"3.9"` as 3,
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* which turns a typo into a silently wrong limit. Falling back to the documented default
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* is the safe failure here.
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*/
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export function intVar(value: unknown, fallback: number): number {
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if (typeof value === 'number') return Number.isInteger(value) ? value : fallback
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if (typeof value !== 'string' || value.trim() === '') return fallback
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const parsed = Number(value)
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return Number.isInteger(parsed) ? parsed : fallback
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}
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