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flowUtilityTypes-test.js
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flowUtilityTypes-test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*/
/*global describe, it, expect*/
import { unwrapUtilityType, isSupportedUtilityType } from '../flowUtilityTypes';
import { statement } from '../../../tests/utils';
describe('flowTypeUtilities', () => {
describe('unwrapUtilityType', () => {
it('correctly unwraps', () => {
const def = statement(`
type A = $ReadOnly<{ foo: string }>
`);
expect(unwrapUtilityType(def.get('right'))).toBe(
def.get('right', 'typeParameters', 'params', 0),
);
});
it('correctly unwraps double', () => {
const def = statement(`
type A = $ReadOnly<$ReadOnly<{ foo: string }>>
`);
expect(unwrapUtilityType(def.get('right'))).toBe(
def.get(
'right',
'typeParameters',
'params',
0,
'typeParameters',
'params',
0,
),
);
});
it('correctly unwraps triple', () => {
const def = statement(`
type A = $ReadOnly<$ReadOnly<$ReadOnly<{ foo: string }>>>
`);
expect(unwrapUtilityType(def.get('right'))).toBe(
def.get(
'right',
'typeParameters',
'params',
0,
'typeParameters',
'params',
0,
'typeParameters',
'params',
0,
),
);
});
});
describe('isSupportedUtilityType', () => {
it('correctly returns true for valid type', () => {
const def = statement(`
type A = $Exact<{ foo: string }>
`);
expect(isSupportedUtilityType(def.get('right'))).toBe(true);
});
it('correctly returns false for invalid type', () => {
const def = statement(`
type A = $Homer<{ foo: string }>
`);
expect(isSupportedUtilityType(def.get('right'))).toBe(false);
});
});
});