dependency-cruiser/src/extract/transpile/svelte-wrap.mjs

Validate and visualize dependencies. With your rules. JavaScript, TypeScript, CoffeeScript. ES6, CommonJS, AMD.

/* eslint-disable no-inline-comments */
import preProcess from "./svelte-preprocess.mjs";
import tryImport from "#utl/try-import.mjs";
import meta from "#meta.cjs";

const { compile, VERSION } = await tryImport(
	"svelte/compiler",
	meta.supportedTranspilers.svelte,
);
/* c8 ignore next */
const MAJOR_VERSION = VERSION ? Number(VERSION.split(".")[0]) : 0;

function getTranspiler(pTranspilerWrapper) {
	return (pSource, _pFileName, pTranspilerOptions) => {
		// svelte 5 natively supports typescript directly, without
		// the need for preprocessing.
		const lPreProcessedSource =
			// eslint-disable-next-line no-magic-numbers
			MAJOR_VERSION < 5
				? /* c8 ignore next */
					preProcess(pSource, pTranspilerWrapper, pTranspilerOptions)
				: pSource;
		// in svelte 5 one must provide the second argument
		// lest it throws because it's accessing a property
		// in it. In svelte 4 (which also takes compiler
		// options there) this isn't necessary.
		return compile(lPreProcessedSource, {}).js.code;
	};
}

export default function svelteWrap(pTranspilerWrapper) {
	return {
		isAvailable: () => Boolean(compile),
		version: () => `svelte/compiler@${VERSION}`,
		transpile: getTranspiler(pTranspilerWrapper),
	};
}