return function importer(url: string, prev: string) {
const nodeSassOptions = this.options;
// Create a context for the current importer run.
// An importer run is different from an importer instance,
// one importer instance can spawn infinite importer runs.
if (!this.nodeSassOnceImporterContext) {
this.nodeSassOnceImporterContext = {
store: new Set(),
};
}
// Each importer run has it's own new store, otherwise
// files already imported in a previous importer run
// would be detected as multiple imports of the same file.
const store = this.nodeSassOnceImporterContext.store;
const includePaths = buildIncludePaths(
nodeSassOptions.includePaths,
prev,
);
const resolvedUrl = resolveUrl(
url,
includePaths,
);
if (store.has(resolvedUrl)) {
return EMPTY_IMPORT;
}
store.add(resolvedUrl);
return null;
};
return function importer(url: string, prev: string) {
const nodeSassOptions = this.options;
const selectorFilters = parseSelectorFilters(url);
if (selectorFilters.length === 0) {
return null;
}
const includePaths = buildIncludePaths(
nodeSassOptions.includePaths,
prev,
);
const cleanedUrl = cleanImportUrl(url);
const resolvedUrl = resolveUrl(cleanedUrl, includePaths);
const css = fs.readFileSync(resolvedUrl, { encoding: `utf8` });
const contents = cssSelectorExtract.processSync({
css,
filters: selectorFilters,
postcssSyntax,
preserveLines: true,
});
return contents ? {
file: resolvedUrl,
contents,
} : null;
};