This utility does not return a transformed type. Instead, it serves as a marker for a contextual this type. Note that the --noImplicitThis flag must be enabled to use this utility.
type ObjectDescriptor<D, M> = { data?: D; methods?: M & ThisType<D & M>; // Type of 'this' in methods is D & M }; function makeObject<D, M>(desc: ObjectDescriptor<D, M>): D & M { let data: object = desc.data || {}; let methods: object = desc.methods || {}; return { ...data, ...methods } as D & M; } let obj = makeObject({ data: { x: 0, y: 0 }, methods: { moveBy(dx: number, dy: number) { this.x += dx; // Strongly typed this this.y += dy; // Strongly typed this }, }, }); obj.x = 10; obj.y = 20; obj.moveBy(5, 5); `` reference: Official typescript doc. 
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