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                                            장재영

File upload not working on Froala 3.2.4 and 3.2.5

Then, How can upload files to server when I use [insertFiles] button?

Infer type guard => array.filter(x => !!x) should refine Array<T|null> to Array<T>

After es2019, you can use [flatMap](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flatMap). Here is my [ts-playground](https://www.typescriptlang.org/play?target=99#code/MYewdgzgLgBAtgTwIICcUwLwwNoHIAWApgDbEi4A0MYArqVbgO4grEAmlMNYbhAZgEswhNgF0A3AChQkWIOJRCKEZnjI0AOj7EAhlACyOgA4AKEwA8AlAAKMAPhjmYAfkcwAXDlGXxQA). ```ts const myArr = ['hello', null, 'world', undefined]; const filteredArr = myArr.flatMap((x) => x ? x : []); ``` Above...