getFrontmatterLanguagePlugin() — astro Function Reference

Source Code

packages/language-tools/language-server/src/core/frontmatterHolders.ts lines 41–91

export function getFrontmatterLanguagePlugin(
	collectionConfig: CollectionConfig,
): LanguagePlugin<URI, FrontmatterHolder> {
	return {
		getLanguageId(scriptId) {
			const fileType = SUPPORTED_FRONTMATTER_EXTENSIONS_KEYS.find((ext) =>
				scriptId.path.endsWith(`.${ext}`),
			);

			if (fileType) {
				return SUPPORTED_FRONTMATTER_EXTENSIONS[
					fileType as keyof typeof SUPPORTED_FRONTMATTER_EXTENSIONS
				];
			}
		},
		createVirtualCode(scriptId, languageId, snapshot) {
			if (SUPPORTED_FRONTMATTER_EXTENSIONS_VALUES.includes(languageId)) {
				return new FrontmatterHolder(
					scriptId.fsPath.replace(/\\/g, '/'),
					languageId,
					snapshot,
					getCollectionName(
						collectionConfig,
						// The scriptId here is encoded and somewhat normalized, as such we can't use it directly to compare with
						// the file URLs in the collection config entries that Astro generates.
						decodeURIComponent(scriptId.toString()).toLowerCase(),
					),
				);
			}
		},
		typescript: {
			extraFileExtensions: SUPPORTED_FRONTMATTER_EXTENSIONS_KEYS.map((ext) => ({
				extension: ext,
				isMixedContent: true,
				scriptKind: 7 satisfies ts.ScriptKind.Deferred,
			})),
			getServiceScript(astroCode) {
				for (const code of forEachEmbeddedCode(astroCode)) {
					if (code.id === VIRTUAL_CODE_ID) {
						return {
							code,
							extension: '.ts',
							scriptKind: 3 satisfies ts.ScriptKind.TS,
						};
					}
				}
				return undefined;
			},
		},
	};
}