49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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var path = require("path");
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function MainFieldPlugin(source, options, target) {
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this.source = source;
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this.options = options;
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this.target = target;
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}
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module.exports = MainFieldPlugin;
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MainFieldPlugin.prototype.apply = function(resolver) {
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var target = this.target;
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var options = this.options;
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resolver.plugin(this.source, function mainField(request, callback) {
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if(request.path !== request.descriptionFileRoot) return callback();
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var content = request.descriptionFileData;
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var filename = path.basename(request.descriptionFilePath);
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var mainModule;
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var field = options.name;
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if(Array.isArray(field)) {
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var current = content;
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for(var j = 0; j < field.length; j++) {
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if(current === null || typeof current !== "object") {
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current = null;
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break;
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}
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current = current[field[j]];
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}
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if(typeof current === "string") {
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mainModule = current;
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}
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} else {
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if(typeof content[field] === "string") {
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mainModule = content[field];
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}
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}
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if(!mainModule) return callback();
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if(options.forceRelative && !/^\.\.?\//.test(mainModule))
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mainModule = "./" + mainModule;
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var obj = Object.assign({}, request, {
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request: mainModule
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});
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return resolver.doResolve(target, obj, "use " + mainModule + " from " + options.name + " in " + filename, callback);
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});
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};
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