Program3r / flow-ts

TypeScript + Flow = Migration

This repo demonstrates that TypeScript and Flow can be happily married into one repo for the purpose of migration from one to the other.

Create tsconfig.json and ignore .JS files

"allowJS":  true,
"include":  [
    "./src/**/*.ts",
    "./src/**/*.tsx"
],
"exclude":  [
    "./src/**/*.js",
    "./src/**/*.jsx"
]

ERROR: Type annotations can only be used in TypeScript files.

Comment out Flow types, they will still be evaluated

./src/examples/FlowFile.js ./src/examples/FlowFile_Commented.js

function  foo(x/*: ?number*/)/*: string*/{
	if (x) {
		return  x.toString();
	}
	return  "default string";
}

Optionally disable JS checking in VS Code if you're still annoyed (no thanks)

./.vscode/settings.test.json (rename to settings.json)

{
	"javascript.validate.enable":  false
}

Test it out

npm install
npm run flow
npm start