Function load

src/utils.js:588–635

* @param {URL} canonicalUrl canonical url * @returns {Promise<{ contents: string, syntax: "scss" | "indented" | "css", sourceMapUrl: URL } | null>} load result

(canonicalUrl)

     * @returns {Promise<{ contents: string, syntax: "scss" | "indented" | "css", sourceMapUrl: URL } | null>} load result
     */
    async load(canonicalUrl) {
      const ext = path.extname(canonicalUrl.pathname);

      /** @type {"scss" | "indented" | "css"} */
      let syntax;

      if (ext && ext.toLowerCase() === ".scss") {
        syntax = "scss";
      } else if (ext && ext.toLowerCase() === ".sass") {
        syntax = "indented";
      } else if (ext && ext.toLowerCase() === ".css") {
        syntax = "css";
      } else {
        // Fallback to default value
        syntax = "scss";
      }

      try {
        const contents = /** @type {string} */ (
          await new Promise((resolve, reject) => {
            // Old version of `enhanced-resolve` supports only path as a string
            // TODO simplify in the next major release and pass URL
            const canonicalPath = url.fileURLToPath(canonicalUrl);

            loaderContext.fs.readFile(
              canonicalPath,
              /**
               * @param {NodeJS.ErrnoException | null} err error
               * @param {Buffer | undefined} content content
               * @returns {void}
               */
              (err, content) => {
                if (err || !content) {
                  reject(err);
                  return;
                }

                resolve(content.toString("utf8"));
              },
            );
          })
        );

        return { contents, syntax, sourceMapUrl: canonicalUrl };
      } catch {
        return null;
      }
    },
  };
}