{"id":3941,"date":"2020-09-24T08:52:00","date_gmt":"2020-09-24T08:52:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/why-you-should-probably-use-typescript\/"},"modified":"2026-04-27T09:49:47","modified_gmt":"2026-04-27T09:49:47","slug":"dlaczego-prawdopodobnie-powinienes-uzywac-typescript","status":"publish","type":"post","link":"https:\/\/thecodest.co\/pl\/blog\/why-you-should-probably-use-typescript\/","title":{"rendered":"Dlaczego (prawdopodobnie) powiniene\u015b u\u017cywa\u0107 Typescript"},"content":{"rendered":"

Aktualna pozycja Maszynopis<\/a> nie wzi\u0119\u0142a si\u0119 znik\u0105d, poniewa\u017c technologia ta jest w stanie naprawd\u0119 poprawi\u0107 nasze do\u015bwiadczenie deweloperskie. Bardziej przejrzyste kodowanie zwi\u0119ksza kontrol\u0119 i przewidywalno\u015b\u0107 kod<\/a>.
W tym artykule postaram si\u0119 przekona\u0107 Ci\u0119 do korzystania z Typescript.<\/p>\n\n\n\n

*- Dane<\/a> \u017ar\u00f3d\u0142o: Stan JS 2020<\/a> i Ankieta dla programist\u00f3w Stack Overflow 2020<\/a>.<\/p>\n\n\n\n

Dowiedz si\u0119 o b\u0142\u0119dach wcze\u015bniej<\/h2>\n\n\n\n

Zazwyczaj podczas tworzenia aplikacji w aplikacji JavaScript<\/a>przep\u0142yw mo\u017ce
wygl\u0105daj\u0105 nast\u0119puj\u0105co:<\/p>\n\n\n\n

    \n
  1. Dokonaj zmiany,<\/li>\n\n\n\n
  2. Przejd\u017a do aplikacji i sprawd\u017a zmienion\u0105 cz\u0119\u015b\u0107 \/ Uruchom (powi\u0105zane) testy.<\/li>\n\n\n\n
  3. Sprawd\u017a, czy wszystko jest w porz\u0105dku.<\/li>\n<\/ol>\n\n\n\n

    Dzi\u0119ki Typescript mo\u017cesz faktycznie wprowadzi\u0107 zmian\u0119 i je\u015bli jest jaka\u015b b\u0142\u0105d typu<\/strong> w kodzie, dowiesz si\u0119 o tym natychmiast dzi\u0119ki komunikatowi o b\u0142\u0119dzie kompilatora lub informacji zwrotnej IDE w czasie rzeczywistym.
    Oczywi\u015bcie kompilator Typescript nie rozwi\u0105\u017ce ka\u017cdego problemu i nie ostrze\u017ce o wszystkich b\u0142\u0119dach, ale jego pomoc mo\u017ce by\u0107 nieoceniona.<\/p>\n\n\n\n

    Lepsze uzupe\u0142nianie sk\u0142adni w IDE<\/h2>\n\n\n\n

    To naprawd\u0119 proste. Je\u015bli korzystasz z dobrych IDE, takich jak WebStorm lub VSCode, otrzymasz
    lepsze uzupe\u0142nianie sk\u0142adni w Typescript. Mo\u017ce nie brzmi to jak ogromna poprawa do\u015bwiadczenia programisty, ale ostatecznie ka\u017cde pojedyncze ulepszenie ma znaczenie, poniewa\u017c mo\u017ce uratowa\u0107     my<\/a> i, ponownie, zapobiec liter\u00f3wkom lub b\u0142\u0119dom. Ponadto mo\u017cemy raz zdefiniowa\u0107 nasz typ lub interfejs; poniewa\u017c nie musimy zawsze pami\u0119ta\u0107 o strukturze, mo\u017cemy skupi\u0107 si\u0119 na pisaniu logiki biznesowej.<\/p>\n\n\n\n

    \"kod\"<\/figure>\n\n\n\n
    \"Kod<\/figure>\n\n\n\n

    Mniej bolesna refaktoryzacja<\/h2>\n\n\n\n

    Wyobra\u017a sobie, \u017ce z jakiegokolwiek powodu musisz przeprowadzi\u0107 refaktoryzacj\u0119, na przyk\u0142ad do\u0142\u0105czy\u0142e\u015b do projekt<\/a> i otrzymujesz zadanie dodania nowej funkcji, ale ta funkcja jest w jaki\u015b spos\u00f3b powi\u0105zana ze starszym kodem.
    Typescript mo\u017ce sprawi\u0107, \u017ce b\u0119dzie to \u0142atwiejsze i mniej bolesne, poniewa\u017c gdy dokonasz zmiany i jest inne miejsce, w kt\u00f3rym musisz dokona\u0107 kolejnej zmiany, kompilator ostrze\u017ce ci\u0119 o tym.<\/p>\n\n\n\n

    Na przyk\u0142ad - mo\u017ce to by\u0107 zmieniona sygnatura funkcji lub, po zmianie, plik
    funkcja zwr\u00f3ci co\u015b zupe\u0142nie innego, wi\u0119c r\u00f3wnie\u017c zwracany typ b\u0119dzie inny.<\/p>\n\n\n\n

    Wi\u0119ksza pewno\u015b\u0107 co do bazy kodu<\/h2>\n\n\n\n

    JavaScript jest s\u0142abo i dynamicznie typowany, wi\u0119c po zainicjowaniu zmiennej warto\u015bci\u0105 let query = ''<\/code> P\u00f3\u017aniej w kodzie programista mo\u017ce przez pomy\u0142k\u0119 zrobi\u0107 co\u015b irracjonalnego, na przyk\u0142ad query = true<\/code>i b\u0119dzie wa\u017cny JS<\/a> kod.<\/p>\n\n\n\n

    W dobrze napisanym kodzie przypisanie warto\u015bci logicznej do zmiennej, kt\u00f3ra wcze\u015bniej by\u0142a ci\u0105giem znak\u00f3w, nie powinno mie\u0107 miejsca. Zazwyczaj wi\u0119c przypisanie ze zmian\u0105 typu jest wynikiem b\u0142\u0119du.<\/p>\n\n\n\n

    Podczas korzystania z Typescript nie mo\u017cemy zmieni\u0107 typu zmiennej, wi\u0119c je\u015bli utworzymy zmienn\u0105 let query = ''<\/code> zmienna, b\u0119dzie to ci\u0105g<\/code> i nie b\u0119dziemy w stanie zmieni\u0107 jego typu przez pomy\u0142k\u0119.<\/p>\n\n\n\n

    Je\u015bli chcemy, aby zmienna by\u0142a wi\u0119cej ni\u017c jednego typu, zawsze robimy to jawnie za pomoc\u0105 unii typ\u00f3w, na przyk\u0142ad ci\u0105g znak\u00f3w | liczba<\/code>.<\/p>\n\n\n\n

    Dlatego te\u017c Typescript sprawia, \u017ce nasz kod jest bardziej przewidywalny i jednoznaczny.
    Ponadto Typescript zadba o jawno\u015b\u0107 w analizie przep\u0142ywu sterowania i je\u015bli istnieje mo\u017cliwo\u015b\u0107, \u017ce co\u015b mo\u017ce p\u00f3j\u015b\u0107 nie tak, ostrze\u017ce ci\u0119.<\/p>\n\n\n\n

    \"przyk\u0142adowy<\/figure>\n\n\n\n

    Tutaj w przyk\u0142adzie pierwszym je\u015bli<\/code> otrzymamy b\u0142\u0105d:<\/p>\n\n\n\n

    TS2339: W\u0142a\u015bciwo\u015b\u0107 \"battery\" nie istnieje w typie \"ClothingProduct\".<\/code> 2 razy, dla bateria<\/code>oraz baran<\/code> w\u0142a\u015bciwo\u015bci.<\/p>\n\n\n\n

    W drugim bloku - inny<\/code>otrzymamy ten b\u0142\u0105d dla rozmiar<\/code> w\u0142asno\u015b\u0107. Oczywi\u015bcie jest to tylko przyk\u0142ad pokazuj\u0105cy, w jaki spos\u00f3b dyskryminowane zwi\u0105zki zawodowe<\/a> i analiza przep\u0142ywu sterowania<\/a> dzia\u0142a w Typescript, wi\u0119c nie robimy nic zbyt skomplikowanego z tym kodem.<\/p>\n\n\n\n

    \u0141atwa, stopniowa migracja z JavaScript<\/h2>\n\n\n\n

    Poprawny kod JavaScript jest jednocze\u015bnie poprawnym kodem Typescript, wi\u0119c mo\u017cesz migrowa\u0107 swoj\u0105 baz\u0119 kodu krok po kroku. Zazwyczaj u\u017cywanie trybu \u015bcis\u0142ego w Typescript jest dobr\u0105 praktyk\u0105, ale w tym przypadku,
    musimy zacz\u0105\u0107 od \"strict\": false<\/code> w tsconfig.json<\/code> i powinni\u015bmy r\u00f3wnie\u017c ustawi\u0107 2 dodatkowe opcje.<\/p>\n\n\n\n

    \"allowJs\": true, \/\/ pozwoli nam to na u\u017cywanie plik\u00f3w .js, a typ nie b\u0119dzie w nich sprawdzany\n\"skipLibCheck\": true \/\/ pominie sprawdzanie typ\u00f3w w bibliotekach, kt\u00f3rych u\u017cywamy<\/code><\/pre>\n\n\n\n
    Dzi\u0119ki tym opcjom mo\u017cemy migrowa\u0107 z JS do TS krok po kroku - plik po pliku, po prostu zmieniaj\u0105c rozszerzenie z .js(x)<\/code> do .ts(x)<\/code> i dodawanie typ\u00f3w w plikach. Korzystaj\u0105c z tego podej\u015bcia, mo\u017cemy unikn\u0105\u0107 setek lub tysi\u0119cy przera\u017caj\u0105cych b\u0142\u0119d\u00f3w kompilacji.<\/p>\n\n\n\n
    Podsumowanie<\/h2>\n\n\n\n
    My\u015bl\u0119, \u017ce powinni\u015bmy u\u017cy\u0107 Maszynopis<\/b> tak cz\u0119sto jak mo\u017cliwy<\/strong>poniewa\u017c jest to naprawd\u0119 korzystne w d\u0142u\u017cszej perspektywie. Pomaga w utrzymaniu projekt\u00f3w, zwi\u0119ksza do\u015bwiadczenie programist\u00f3w i sprawia, \u017ce nasza baza kodu jest bardziej przejrzysta i niezawodna.<\/p>\n\n\n\n
    Jednak, jak zawsze, istniej\u0105 wyj\u0105tki - na przyk\u0142ad dla prostej strony docelowej
    gdzie JavaScript jest u\u017cywany tylko do prze\u0142\u0105czania klasy lub innego prostego przypadku, Typescript nie ma sensu.
    Trzeba te\u017c pami\u0119ta\u0107, \u017ce aby w pe\u0142ni wykorzysta\u0107 mo\u017cliwo\u015bci Typescriptu, musimy nauczy\u0107 si\u0119 go u\u017cywa\u0107 na wystarczaj\u0105cym poziomie, a to mo\u017ce zaj\u0105\u0107 troch\u0119 czasu. Mimo wszystko uwa\u017cam, \u017ce jest to bardzo op\u0142acalna inwestycja czasu.<\/p>\n\n\n\n
    Czytaj wi\u0119cej:<\/strong><\/p>\n\n\n\n
    Ruby 3.0. Ruby i mniej znane metody kontroli prywatno\u015bci<\/a><\/p>\n\n\n\n
    Najwy\u017csza jako\u015b\u0107 kodu w projekcie SaaS. Dlaczego powiniene\u015b si\u0119 tym przejmowa\u0107 jako (nietechniczny) za\u0142o\u017cyciel?<\/a><\/p>\n\n\n\n
    *Grafika tytu\u0142owa pochodzi ze strony Know Your Meme.<\/em><\/p>","protected":false},"excerpt":{"rendered":"
    Ka\u017cdy, kto korzysta z ekosystemu JavaScript, jest dzi\u015b \u015bwiadomy istnienia Typescript. Typescript jest jedn\u0105 z najbardziej lubianych technologii*, a jego u\u017cycie stale ro\u015bnie (udzia\u0142 w u\u017cyciu wzr\u00f3s\u0142 z 52% w 2018 roku do 78% w 2020 roku)*.<\/p>","protected":false},"author":2,"featured_media":3942,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"\nWhy you should (probably) use Typescript - The Codest<\/title>\n<meta name=\"description\" content=\"Everyone who use JavaScript ecosystem is nowadays aware of Typescript. 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