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directInstanceOf: Fix handling of undefined and null

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Fixes #199
This commit is contained in:
Sindre Sorhus 2023-10-15 16:01:29 +07:00
parent 9d6c91ee58
commit e7e2213e91
2 changed files with 7 additions and 0 deletions
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4
source/index.ts
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@ -413,6 +413,10 @@ export function isDate(value: unknown): value is Date {
} }
export function isDirectInstanceOf<T>(instance: unknown, class_: Class<T>): instance is T { export function isDirectInstanceOf<T>(instance: unknown, class_: Class<T>): instance is T {
if (instance === undefined || instance === null) {
return false;
}
return Object.getPrototypeOf(instance) === class_.prototype; return Object.getPrototypeOf(instance) === class_.prototype;
} }

3
test/test.ts
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@ -986,6 +986,9 @@ test('is.directInstanceOf', t => {
t.throws(() => { t.throws(() => {
assert.directInstanceOf(errorSubclass, Error); assert.directInstanceOf(errorSubclass, Error);
}); });
t.false(is.directInstanceOf(undefined, Error));
t.false(is.directInstanceOf(null, Error));
}); });
test('is.urlInstance', t => { test('is.urlInstance', t => {