/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const path = require("path");
const DescriptionFileUtils = require("./DescriptionFileUtils");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").JsonObject} JsonObject */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {{name: string|Array<string>, forceRelative: boolean}} MainFieldOptions */
const alreadyTriedMainField = Symbol("alreadyTriedMainField");
module.exports = class MainFieldPlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {MainFieldOptions} options options
* @param {string | ResolveStepHook} target target
*/
constructor(source, options, target) {
this.source = source;
this.options = options;
this.target = target;
}
/**
* @param {Resolver} resolver the resolver
* @returns {void}
*/
apply(resolver) {
const target = resolver.ensureHook(this.target);
resolver
.getHook(this.source)
.tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
if (
request.path !== request.descriptionFileRoot ||
/** @type {ResolveRequest & { [alreadyTriedMainField]?: string }} */
(request)[alreadyTriedMainField] === request.descriptionFilePath ||
!request.descriptionFilePath
)
return callback();
const filename = path.basename(request.descriptionFilePath);
let mainModule =
/** @type {string|null|undefined} */
(
DescriptionFileUtils.getField(
/** @type {JsonObject} */ (request.descriptionFileData),
this.options.name
)
);
if (
!mainModule ||
typeof mainModule !== "string" ||
mainModule === "." ||
mainModule === "./"
) {
return callback();
}
if (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
mainModule = "./" + mainModule;
/** @type {ResolveRequest & { [alreadyTriedMainField]?: string }} */
const obj = {
...request,
request: mainModule,
module: false,
directory: mainModule.endsWith("/"),
[alreadyTriedMainField]: request.descriptionFilePath
};
return resolver.doResolve(
target,
obj,
"use " +
mainModule +
" from " +
this.options.name +
" in " +
filename,
resolveContext,
callback
);
});
}
};