Function enter

src/transform/destructParam.js:15–46

(fnNode, parent, scope)

  traverser.traverse(ast, withScope(ast, {
    enter(fnNode, parent, scope) {
      if (functionType.isFunction(fnNode)) {
        scope.variables
          .filter(isParameter)
          .map(v => ({variable: v, exs: getMemberExpressions(v, hierarchy)}))
          .filter(({exs}) => exs.length > 0)
          .forEach(({variable, exs}) => {
            // Replace parameter with destruct-pattern
            const index = fnNode.params.findIndex(param => param === variable.defs[0].name);
            if (index === -1) {
              return;
            }

            if (uniqPropNames(exs).length > MAX_PROPS) {
              logger.warn(
                fnNode,
                `${uniqPropNames(exs).length} different props found, will not transform more than ${MAX_PROPS}`,
                'destruct-param'
              );
              return;
            }

            fnNode.params[index] = createDestructPattern(exs);

            // Replace references of obj.foo with simply foo
            exs.forEach(ex => {
              ex.type = ex.property.type;
              ex.name = ex.property.name;
            });
          });
      }
    }
  }));
}