Javascript

[Typescript] Step1 & 2 for converting a js app to ts

本文主要是介绍[Typescript] Step1 & 2 for converting a js app to ts，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

1. Compiling in "loose mode"

  • Start with all tests passing
  • Rename all .js to .ts, allowing implicit any
  • Fix only things that are not type-checking, or causing compile errors
  • Be careful to avoid changing behavior of function
  • Get test passing again.
# rename all JSX files in src/ to TSX
find src -name '*.jsx' -exec bash -c 'git mv "$0" "${0%.jsx}.tsx"' "{}" \;
# rename all JS files in src/ to TS
find src -name '*.js' -exec bash -c 'git mv "$0" "${0%.js}.ts"' "{}" \;
# rename all JSX files in src/ to TSX
find tests -name '*.jsx' -exec bash -c 'git mv "$0" "${0%.jsx}.tsx"' "{}" \;
# rename all JSX files in src/ to TSX
find tests -name '*.jsx.snap' -exec bash -c 'git mv "$0" "${0%.jsx.snap}.tsx.snap"' "{}" \;
# rename all JS files in tests/ to TS
find tests -name '*.js' -exec bash -c 'git mv "$0" "${0%.js}.ts"' "{}" \;
and don't forget to make this small change to index.html 
```diff
--- a/index.html
+++ b/index.html
@@ -8,6 +8,6 @@
   </head>
   <body class="font-sans antialiased h-screen">
     <div id="appContainer" class="w-full h-full"></div>
-    <script src="src/index.js" type="text/javascript"></script>
+    <script src="src/index.ts" type="text/javascript"></script>
   </body>
 </html>
```
and this change to tsconfig for step 1.

2. Explicit Any

  • Start with tests passing
  • Ban implicit any

"noImplicityAny": true,

  • Where possible, provide a specific and appropriate type
    • Import types for dependencies from DefinitelyTypes
    • otherwise explicit any
  • Get tests passing again

 

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