(input: any, preferredType: T)
| 37 | * https://tc39.es/ecma262/#sec-toprimitive |
| 38 | */ |
| 39 | export function ToPrimitive< |
| 40 | T extends 'string' | 'number' = 'string' | 'number', |
| 41 | >(input: any, preferredType: T): string | number | boolean | undefined | null { |
| 42 | if (typeof input === 'object' && input != null) { |
| 43 | const exoticToPrim = |
| 44 | Symbol.toPrimitive in input ? input[Symbol.toPrimitive] : undefined |
| 45 | let hint |
| 46 | if (exoticToPrim !== undefined) { |
| 47 | if (preferredType === undefined) { |
| 48 | hint = 'default' |
| 49 | } else if (preferredType === 'string') { |
| 50 | hint = 'string' |
| 51 | } else { |
| 52 | invariant( |
| 53 | preferredType === 'number', |
| 54 | 'preferredType must be "string" or "number"' |
| 55 | ) |
| 56 | hint = 'number' |
| 57 | } |
| 58 | let result = exoticToPrim.call(input, hint) |
| 59 | if (typeof result !== 'object') { |
| 60 | return result |
| 61 | } |
| 62 | throw new TypeError('Cannot convert exotic object to primitive.') |
| 63 | } |
| 64 | if (preferredType === undefined) { |
| 65 | preferredType = 'number' as T |
| 66 | } |
| 67 | return OrdinaryToPrimitive(input, preferredType) |
| 68 | } |
| 69 | return input |
| 70 | } |
no test coverage detected