optimize-array-destruct.js

/**
 * The transformer signature is based on https://github.com/cevek/ttypescript#program
 */
export default function (program) {
  const checker = program.getTypeChecker();
  return (context) => {
    const { factory } = context;

    return (sourceFile) => {
      const visitor = (node) => {
        if(ts.isArrayBindingPattern(node)) {
          const elements = node.elements.map((el, i) => {
            if (!el.getText()) return undefined
            return { key: '' + i, name: el.getText() }
          }).filter(Boolean)

          const objectBindingPattern = factory.createObjectBindingPattern()
          objectBindingPattern.elements = elements.map(el => {
            const key = factory.createIdentifier(el.key)
           	const name = factory.createIdentifier(el.name)
          	return factory.createBindingElement(undefined, key, name)
          })
          return objectBindingPattern
        }

        return ts.visitEachChild(node, visitor, context);
      };
      return ts.visitNode(sourceFile, visitor);
    };
  };
};