A developer migrating from Vue 2 Options API to Vue 3 Composition API with TypeScript explores how Vue's SFC compiler handles TypeScript generics in defineProps and defineEmits. Using Vue's compiler-sfc package (parse and compileScript functions), a small script is built to inspect how TypeScript type information is transformed into runtime JavaScript prop definitions. Key findings: primitives map one-to-one, TypeScript interfaces become { type: Object }, arrays become { type: Array }, and the optional ? modifier drives the required property.
3 Impressions