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index.spec.ts
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index.spec.ts
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import descriptors from './';
const input = {
name: 'Vitor',
birth: new Date(1996, 2, 28),
};
const symbol = Symbol('SECRET');
Object.defineProperty(input, symbol, {
configurable: false,
enumerable: false,
writable: false,
value: 0,
});
const output = {
name: {
configurable: true,
enumerable: true,
writable: true,
value: 'Vitor',
},
birth: {
configurable: true,
enumerable: true,
writable: true,
value: new Date(1996, 2, 28),
},
[symbol]: {
configurable: false,
enumerable: false,
writable: false,
value: 0,
},
};
it('Throws TypeError if value is `null`', () => {
expect(() => {
descriptors((null as unknown) as object);
}).toThrow(new TypeError('Cannot convert undefined or null to object'));
});
it('Throws TypeError if value is `undefinned`', () => {
expect(() => {
descriptors((undefined as unknown) as object);
}).toThrow(new TypeError('Cannot convert undefined or null to object'));
});
it('Returns property descriptors', () => {
const value = descriptors(input);
expect(value).toEqual(output);
});
it('Polyfills Object.getOwnPropertyDescriptors', () => {
const getOwnPropertyDescriptors = Object.getOwnPropertyDescriptors;
// @ts-expect-error
delete Object.getOwnPropertyDescriptors;
const value = descriptors(input);
Object.getOwnPropertyDescriptors = getOwnPropertyDescriptors;
expect(value).toEqual(output);
});
it('Polyfills Reflect.ownKeys', () => {
const getOwnKeys = Reflect.ownKeys;
const getOwnPropertyDescriptors = Object.getOwnPropertyDescriptors;
// @ts-expect-error
delete Reflect.ownKeys;
// @ts-expect-error
delete Object.getOwnPropertyDescriptors;
const value = descriptors(input);
Reflect.ownKeys = getOwnKeys;
Object.getOwnPropertyDescriptors = getOwnPropertyDescriptors;
expect(value).toEqual(output);
});
it('Polyfills Object.getOwnPropertySymbols + not work for symbols', () => {
const getOwnKeys = Reflect.ownKeys;
const getOwnPropertySymbols = Object.getOwnPropertySymbols;
const getOwnPropertyDescriptors = Object.getOwnPropertyDescriptors;
// @ts-expect-error
delete Reflect.ownKeys;
// @ts-expect-error
delete Object.getOwnPropertySymbols;
// @ts-expect-error
delete Object.getOwnPropertyDescriptors;
const value = descriptors(input);
const { [symbol]: _, ...outputWithoutSymbol } = output;
Reflect.ownKeys = getOwnKeys;
Object.getOwnPropertySymbols = getOwnPropertySymbols;
Object.getOwnPropertyDescriptors = getOwnPropertyDescriptors;
expect(value).not.toHaveProperty([symbol]);
expect(value).toEqual(outputWithoutSymbol);
});