John Dvorak
43 lines
1.7 KiB
TypeScript
43 lines
1.7 KiB
TypeScript
/**
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* Property runner input domain contracts.
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*
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* These types define how render inputs are supplied to a property run:
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* either as an explicit finite enumeration (determinate) or as a
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* generated sampled domain (sampled). The mode is always explicit.
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*
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* Invariant 6: every InputDomain carries its mode at the type level so
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* downstream code cannot silently switch from enumerated to generated.
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*/
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// ---------------------------------------------------------------------------
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// InputDomain
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// ---------------------------------------------------------------------------
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export type InputDomain =
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| { mode: 'enumerated'; values: unknown[] }
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| { mode: 'generated'; arbitrary: unknown; seed?: number; numRuns?: number }
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// ---------------------------------------------------------------------------
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// Type Guards
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// ---------------------------------------------------------------------------
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export function isEnumeratedDomain(domain: InputDomain): domain is Extract<InputDomain, { mode: 'enumerated' }> {
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return domain.mode === 'enumerated'
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}
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export function isGeneratedDomain(domain: InputDomain): domain is Extract<InputDomain, { mode: 'generated' }> {
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return domain.mode === 'generated'
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}
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// ---------------------------------------------------------------------------
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// Factory Helpers
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// ---------------------------------------------------------------------------
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export function enumeratedDomain(values: unknown[]): InputDomain {
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return { mode: 'enumerated', values }
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}
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export function generatedDomain(arbitrary: unknown, options?: { seed?: number; numRuns?: number }): InputDomain {
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return { mode: 'generated', arbitrary, seed: options?.seed, numRuns: options?.numRuns }
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}
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