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