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solution1: https://github.com/vitejs/vite/blob/2d9008e81d0d835e10437a959fac12529f7823e1/packages/vite/rollup.config.ts#L138 vite internally use @rollup/plugin-json to resolve json file. you can install the plugin and add your options to support the geojson file. maybe the include
params is what you want https://github.com/rollup/plugins/blob/master/packages/json/README.md
(recommended)solution2:
import j from "@/assets/a.geojson?raw";
console.log(JSON.parse(j));
Source:stackexchange.com