Return JSON object with TypeScript function
You can indeed specify that you return object (new to typescript 2.2), but you can create a type for your return value:
type MyReturnTypeItem = { vars: string[]; smps: string[]; data: string[];}type MyReturnType = { [name: string]: MyReturnTypeItem;}function formaterDonnees(data: string): MyReturnType { var json = { y: { "vars": [], "smps": [], "data": [] } }; // put new variables in JSON (not real values below) json.y.data = ["data"]; json.y.smps = ["smps"]; json.y.vars = ["vars"]; return json;};Also, while I used type alias you can do the same with interfaces:
interface MyReturnTypeItem { vars: string[]; smps: string[]; data: string[];}interface MyReturnType { [name: string]: MyReturnTypeItem;}