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Contents?: true
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Stored size: 811 Bytes
Contents
import { toReadonlyArray } from './toReadonlyArray'
it('creates a copy of an array', () => {
expect(toReadonlyArray([1, 2, 3])).toEqual([1, 2, 3])
})
it('does not affect the source array', () => {
const source = ['a', 'b', 'c']
toReadonlyArray(source)
expect(source.push('d')).toBe(4)
expect(source).toEqual(['a', 'b', 'c', 'd'])
})
it('forbids modifying the array copy', () => {
const source = [1, 2, 3]
const copy = toReadonlyArray(source)
expect(() => {
// @ts-expect-error Intentional runtime misusage.
copy[2] = 1
}).toThrow(/Cannot assign to read only property '\d+' of object/)
expect(() => {
// @ts-expect-error Intentional runtime misusage.
copy.push(4)
}).toThrow(/Cannot add property \d+, object is not extensible/)
expect(source).toEqual([1, 2, 3])
})
Version data entries
26 entries across 26 versions & 1 rubygems