React to TSX Code

A toolkit provide some codemod scripts based on jscodeshift to migrating react code base to typesceipt.

Getting Started

NOTE Please make sure a stable and modern verison of node and npm packages installed!

git clone $this-repo
yarn install
# or npm install

Usage

All npm scripts can be run in jscodeshift's dry mode, which will never really change the files' content.

jscodeshift -t ./transforms/$some-provided-codemod.js $react-code-base-path --extension js --parser babylon

If you want to rename all js/jsx files to tsx/ts files, a simple rename file is provied to do this job.

npm run rename $code-base-path js tsx

add-import.js

Add a import statement to each file match the path pattern specified;

react-to-tsx.js

Add type annotaions to react composite components based on exsiting propTypes defination, turn from

...
class Counter extends Component {
    static propTypes = {
        active: PropTypes.bool,
        name: PropTypes.string,
        count: PropTypes.number,
        unit: PropTypes.node,
        lowerLimit: PropTypes.number,
        upperLimit: PropTypes.number,
        onCountChange: PropTypes.func,
    };
    ...
}
...

to:

...
type CounterState = {};
interface CounterProps extends BaseProps {
  active?: boolean,
  name?: string,
  count?: number,
  unit?: any,
  lowerLimit?: number,
  upperLimit?: number,
  onCountChange?: any,
}
class Counter extends Component<CounterProps, CounterState> {
    static propTypes = {
        active: PropTypes.bool,
        name: PropTypes.string,
        count: PropTypes.number,
        unit: PropTypes.node,
        lowerLimit: PropTypes.number,
        upperLimit: PropTypes.number,
        onCountChange: PropTypes.func,
    };
    ...
}
...

sfc-to-tsx.js

Add type annotaions to stateless function components based on exsiting propTypes defination, turn from

...
const Counter = ({ unit, count, lowerLimit, onCountChange}) => {
    return (
        <div className="fake-counter">
            <span className="operation" onClick={this.onCountChange.bind(this, 'minus')}>
                -
            </span>
            <span className="count">
                {count}
                {unit}
            </span>
            <span className="operation" onClick={this.onCountChange.bind(this, 'add')}>
                +
            </span>
        </div>
    );
};

Counter.propTypes = {
    active: PropTypes.bool,
    name: PropTypes.string,
    count: PropTypes.number,
    unit: PropTypes.node,
    lowerLimit: PropTypes.number,
    upperLimit: PropTypes.number,
    onCountChange: PropTypes.func,
};
...

to:

...
const Counter: React.SFC<CounterProps> = ({ unit, count, lowerLimit, onCountChange}) => {
    return (
        <div className="fake-counter">
            <span className="operation" onClick={this.onCountChange.bind(this, 'minus')}>
                -
            </span>
            <span className="count">
                {count}
                {unit}
            </span>
            <span className="operation" onClick={this.onCountChange.bind(this, 'add')}>
                +
            </span>
        </div>
    );
};

interface CounterProps extends BaseProps {
  active?: boolean,
  name?: string,
  count?: number,
  unit?: any,
  lowerLimit?: number,
  upperLimit?: number,
  onCountChange?: any,
}
...

Debug

VS Code debug tool + nodejs debugger is heavilly recommended; sample config: .vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch via NPM",
            "runtimeExecutable": "npm",
            "runtimeArgs": ["run", "dev"],
            "port": 9229
        }
    ]
}

More Info @jscodeshift

Alt Codemods

• react-codemod - React codemod scripts to update React APIs.
• js-codemod - Codemod scripts to transform code to next generation JS.
• js-transforms - Some documented codemod experiments to help you learn.

Support

jscodeshift: https://github.com/facebook/jscodeshift

recast: https://github.com/benjamn/recast

ast-types: https://github.com/benjamn/ast-types

ast-explorer: http://astexplorer.net/