import.meta

I recently found out about the import.meta syntax while working on that uses Vite.

The import.meta is an object that is bundled with the JavaScript Modules. It contains information about the module and is extensible.

The following is an example of using the query parameters with the import syntax.


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<script type="module">
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import "./index.mjs?someParams=foo";
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</script>

The index.mjs module is able to read the parameters someParams using the import.meta syntax


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new URL(import.meta.url).searchParams.get("someParams"); // foo

This is something new to me in which it cannot be done when using process.env

TypeScript

We are able to create the typing through env.d.ts in the root of the project


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// env.d.ts
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interface ImportMetaEnv {
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SOME_ENV_VARIABLE: string;
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}
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interface ImportMeta {
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readonly env: ImportMetaEnv;
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}

Uses

This is normally used in the browser.