196 lines
5.4 KiB
JavaScript
196 lines
5.4 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 Ivan Kopeykin @vankop
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*/
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"use strict";
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const DescriptionFileUtils = require("./DescriptionFileUtils");
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const forEachBail = require("./forEachBail");
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const { processImportsField } = require("./util/entrypoints");
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const { parseIdentifier } = require("./util/identifier");
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const { checkImportsExportsFieldTarget } = require("./util/path");
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/** @typedef {import("./Resolver")} Resolver */
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/** @typedef {import("./Resolver").JsonObject} JsonObject */
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/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
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/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
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/** @typedef {import("./util/entrypoints").FieldProcessor} FieldProcessor */
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/** @typedef {import("./util/entrypoints").ImportsField} ImportsField */
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const dotCode = ".".charCodeAt(0);
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module.exports = class ImportsFieldPlugin {
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/**
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* @param {string | ResolveStepHook} source source
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* @param {Set<string>} conditionNames condition names
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* @param {string | string[]} fieldNamePath name path
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* @param {string | ResolveStepHook} targetFile target file
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* @param {string | ResolveStepHook} targetPackage target package
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*/
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constructor(
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source,
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conditionNames,
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fieldNamePath,
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targetFile,
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targetPackage
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) {
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this.source = source;
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this.targetFile = targetFile;
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this.targetPackage = targetPackage;
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this.conditionNames = conditionNames;
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this.fieldName = fieldNamePath;
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/** @type {WeakMap<JsonObject, FieldProcessor>} */
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this.fieldProcessorCache = new WeakMap();
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}
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/**
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* @param {Resolver} resolver the resolver
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* @returns {void}
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*/
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apply(resolver) {
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const targetFile = resolver.ensureHook(this.targetFile);
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const targetPackage = resolver.ensureHook(this.targetPackage);
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resolver
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.getHook(this.source)
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.tapAsync("ImportsFieldPlugin", (request, resolveContext, callback) => {
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// When there is no description file, abort
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if (!request.descriptionFilePath || request.request === undefined) {
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return callback();
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}
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const remainingRequest =
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request.request + request.query + request.fragment;
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const importsField =
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/** @type {ImportsField|null|undefined} */
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(
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DescriptionFileUtils.getField(
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/** @type {JsonObject} */ (request.descriptionFileData),
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this.fieldName
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)
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);
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if (!importsField) return callback();
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if (request.directory) {
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return callback(
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new Error(
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`Resolving to directories is not possible with the imports field (request was ${remainingRequest}/)`
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)
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);
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}
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/** @type {string[]} */
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let paths;
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try {
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// We attach the cache to the description file instead of the importsField value
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// because we use a WeakMap and the importsField could be a string too.
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// Description file is always an object when exports field can be accessed.
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let fieldProcessor = this.fieldProcessorCache.get(
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/** @type {JsonObject} */ (request.descriptionFileData)
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);
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if (fieldProcessor === undefined) {
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fieldProcessor = processImportsField(importsField);
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this.fieldProcessorCache.set(
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/** @type {JsonObject} */ (request.descriptionFileData),
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fieldProcessor
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);
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}
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paths = fieldProcessor(remainingRequest, this.conditionNames);
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} catch (/** @type {unknown} */ err) {
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if (resolveContext.log) {
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resolveContext.log(
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`Imports field in ${request.descriptionFilePath} can't be processed: ${err}`
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);
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}
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return callback(/** @type {Error} */ (err));
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}
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if (paths.length === 0) {
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return callback(
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new Error(
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`Package import ${remainingRequest} is not imported from package ${request.descriptionFileRoot} (see imports field in ${request.descriptionFilePath})`
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)
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);
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}
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forEachBail(
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paths,
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/**
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* @param {string} p path
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* @param {(err?: null|Error, result?: null|ResolveRequest) => void} callback callback
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* @returns {void}
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*/
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(p, callback) => {
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const parsedIdentifier = parseIdentifier(p);
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if (!parsedIdentifier) return callback();
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const [path_, query, fragment] = parsedIdentifier;
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const error = checkImportsExportsFieldTarget(path_);
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if (error) {
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return callback(error);
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}
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switch (path_.charCodeAt(0)) {
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// should be relative
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case dotCode: {
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/** @type {ResolveRequest} */
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const obj = {
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...request,
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request: undefined,
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path: resolver.join(
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/** @type {string} */ (request.descriptionFileRoot),
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path_
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),
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relativePath: path_,
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query,
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fragment
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};
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resolver.doResolve(
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targetFile,
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obj,
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"using imports field: " + p,
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resolveContext,
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callback
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);
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break;
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}
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// package resolving
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default: {
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/** @type {ResolveRequest} */
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const obj = {
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...request,
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request: path_,
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relativePath: path_,
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fullySpecified: true,
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query,
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fragment
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};
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resolver.doResolve(
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targetPackage,
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obj,
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"using imports field: " + p,
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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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/**
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* @param {null|Error} [err] error
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* @param {null|ResolveRequest} [result] result
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* @returns {void}
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*/
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(err, result) => callback(err, result || null)
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);
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});
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}
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};
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