How to dynamically load topics and perform type inference using import.meta.glob in Vue3?

Dynamically load topics and implement type safety in Vue 3

This article discusses how to dynamically import topic files using import.meta.glob in Vue 3 and solve the problem of type inference. The core problem is how to accurately infer the theme name type ThemeName from the theme objects generated at runtime.

We use import.meta.glob('./themes/*.ts', { eager: true }) to import all .ts files under the themes folder. These files all export a default property with type GlobalThemeOverrides (from naive-ui, which can be ignored here). The formatImports function handles the import results, converts the file name (e.g. gray.ts ) to the subject name (e.g. gray ), and builds the themes object.

The goal is to generate a ThemeName type that contains exactly all loaded topic names, such as 'gray' | 'slate' . Neither as const nor auxiliary type inference will take effect at compile time, because the result of import.meta.glob can be determined only at runtime. TypeScript's type inference occurs at compile time and runtime data cannot be accessed.

The problem is that TypeScript's type system cannot directly access dynamic data generated at runtime. modules object is unknown at compile time, and its contents can only be determined at runtime. Therefore, it is not feasible to infer ThemeName type at compile time. The workaround needs to consider taking the topic name at runtime and passing it to TypeScript, but this is beyond TypeScript's compile-time type checking capabilities. Therefore, using any type or type checking at runtime is a more practical solution.

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