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