[Typescript] Step1 & 2 for converting a js app to ts
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
```diff
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,9 +3,10 @@
"target": "ES2018",
"allowJs": true,
"module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
- "strict": true /* Enable all strict type-checking options. */,
+ // "strict": true /* Enable all strict type-checking options. */,
"forceConsistentCasingInFileNames": true,
"noEmit": true,
+ "noImplicitAny": false,
"outDir": "dist",
"declaration": true,
"jsx": "react",
```
See this commit example: https://github.com/zhentian-wan/professional-ts/commit/158d8032edf0dc71033fb9b1b32e8022671b0836
