webpackImporter.js
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"use strict";
/**
* @name PromisedResolve
* @type {Function}
* @param {string} dir
* @param {string} request
* @returns Promise
*/
/**
* @name Importer
* @type {Function}
* @param {string} url
* @param {string} prev
* @param {Function<Error, string>} done
*/
const path = require("path");
const tail = require("lodash.tail");
const importsToResolve = require("./importsToResolve");
const matchCss = /\.css$/;
/**
* Returns an importer that uses webpack's resolving algorithm.
*
* It's important that the returned function has the correct number of arguments
* (based on whether the call is sync or async) because otherwise node-sass doesn't exit.
*
* @param {string} resourcePath
* @param {PromisedResolve} resolve
* @param {Function<string>} addNormalizedDependency
* @returns {Importer}
*/
function webpackImporter(resourcePath, resolve, addNormalizedDependency) {
function dirContextFrom(fileContext) {
return path.dirname(
// The first file is 'stdin' when we're using the data option
fileContext === "stdin" ? resourcePath : fileContext
);
}
function startResolving(dir, importsToResolve) {
return importsToResolve.length === 0 ?
Promise.reject() :
resolve(dir, importsToResolve[0])
.then(resolvedFile => {
// Add the resolvedFilename as dependency. Although we're also using stats.includedFiles, this might come
// in handy when an error occurs. In this case, we don't get stats.includedFiles from node-sass.
addNormalizedDependency(resolvedFile);
return {
// By removing the CSS file extension, we trigger node-sass to include the CSS file instead of just linking it.
file: resolvedFile.replace(matchCss, "")
};
}, () => startResolving(
dir,
tail(importsToResolve)
));
}
return (url, prev, done) => {
startResolving(
dirContextFrom(prev),
importsToResolve(url)
) // Catch all resolving errors, return the original file and pass responsibility back to other custom importers
.catch(() => ({ file: url }))
.then(done);
};
}
module.exports = webpackImporter;