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https://github.com/djdevin/recflare.git
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Devin Zuczek
50 lines
2.0 KiB
TypeScript
50 lines
2.0 KiB
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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/**
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* Read an on/off worker var, falling back to `fallback` when it is unset or unusable.
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*
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* Accepts the spellings an operator plausibly types — `on`/`off`, `true`/`false`,
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* `yes`/`no`, `1`/`0`, in any case — plus a real boolean or number, since a var declared
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* in wrangler.jsonc `vars` keeps its JSON type while one set with `--var` is a string (see
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* `intVar`). Anything else (an empty string, `enabled`, a typo) is treated as unset rather
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* than read as true or false: a switch that guards something sensitive must not flip on a
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* misspelling, so the documented default is the safe failure.
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*/
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export function flagVar(value: unknown, fallback: boolean): boolean {
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if (typeof value === 'boolean') return value
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if (typeof value === 'number') return value === 1 ? true : value === 0 ? false : fallback
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if (typeof value !== 'string') return fallback
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switch (value.trim().toLowerCase()) {
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case 'on':
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case 'true':
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case 'yes':
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case '1':
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return true
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case 'off':
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case 'false':
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case 'no':
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case '0':
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return false
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default:
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return fallback
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}
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}
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