Codemod to convert class methods to properties, and remove `.bind(this)` in JSX props

class-properties-to-methods.js

// Codemod to convert class methods to properties, and remove `.bind(this)` in JSX props.
// Doesn't support Flow annotations yet
export default function(file, api) {
    const j = api.jscodeshift;

    const convertToClassProps = p => {
        const node = p.node;

        if (node.key.name.indexOf('_') === 0) {
            node.type = 'ClassProperty';
            node.value.type = 'ArrowFunctionExpression';
        }
    };

    const removeFunctionBind = p => {
        if (p.node.expression.type === 'CallExpression' && p.node.expression.callee.property && p.node.expression.callee.property.name === 'bind') {
            p.node.expression = p.node.expression.callee.object;
        }
    };

    return j(file.source)
        .find(j.MethodDefinition)
        .forEach(convertToClassProps)
        .find(j.JSXExpressionContainer)
        .forEach(removeFunctionBind)
        .toSource();
}