ow/dist/predicates/base-predicate.js

Function argument validation for humans

/**
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*/
export const testSymbol = Symbol('test');
/**
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*/
export const optionalSymbol = Symbol('optional');
/**
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*/
export const nullableSymbol = Symbol('nullable');
/**
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*/
export const absentSymbol = Symbol('absent');
/**
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*/
export const isPredicate = (value) => Boolean(value?.[testSymbol]);