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Fix missed case in "observe" type check #2919

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merged 3 commits into from
Apr 8, 2018
Merged

Fix missed case in "observe" type check #2919

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172623e
Make sure that assumed TypeError would be thrown
zerobias Apr 7, 2018
ab93291
Check that ThrowError would be thrown in case of null observer object
zerobias Apr 7, 2018
dca1ce3
Add null check for subscribe method
zerobias Apr 7, 2018
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2 changes: 1 addition & 1 deletion src/createStore.js
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,7 @@ export default function createStore(reducer, preloadedState, enhancer) {
* emission of values from the observable.
*/
subscribe(observer) {
if (typeof observer !== 'object') {
if (typeof observer !== 'object' || observer === null) {
throw new TypeError('Expected the observer to be an object.')
}

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8 changes: 6 additions & 2 deletions test/createStore.spec.js
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Expand Up @@ -629,11 +629,15 @@ describe('createStore', () => {

expect(function() {
obs.subscribe()
}).toThrow()
}).toThrowError(new TypeError('Expected the observer to be an object.'))

expect(function() {
obs.subscribe(null)
}).toThrowError(new TypeError('Expected the observer to be an object.'))

expect(function() {
obs.subscribe(() => {})
}).toThrow()
}).toThrowError(new TypeError('Expected the observer to be an object.'))

expect(function() {
obs.subscribe({})
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