/*
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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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"use strict";
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const path = require("path");
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module.exports = class MainFieldPlugin {
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constructor(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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apply(resolver) {
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const target = resolver.ensureHook(this.target);
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resolver
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.getHook(this.source)
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.tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
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if (request.path !== request.descriptionFileRoot) return callback();
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if (request.alreadyTriedMainField === request.descriptionFilePath)
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return callback();
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const content = request.descriptionFileData;
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const filename = path.basename(request.descriptionFilePath);
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let mainModule;
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const field = this.options.name;
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if (Array.isArray(field)) {
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let current = content;
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for (let 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 (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
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mainModule = "./" + mainModule;
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const obj = Object.assign({}, request, {
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request: mainModule,
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alreadyTriedMainField: request.descriptionFilePath
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});
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return resolver.doResolve(
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target,
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obj,
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"use " +
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mainModule +
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" from " +
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this.options.name +
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" in " +
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filename,
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resolveContext,
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callback
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);
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});
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}
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};
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