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