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- "use strict";
- const path = require("path");
- const DescriptionFileUtils = require("./DescriptionFileUtils");
- const forEachBail = require("./forEachBail");
- const { processExportsField } = require("./util/entrypoints");
- const { parseIdentifier } = require("./util/identifier");
- const { checkImportsExportsFieldTarget } = require("./util/path");
- module.exports = class ExportsFieldPlugin {
-
- constructor(source, conditionNames, fieldNamePath, target) {
- this.source = source;
- this.target = target;
- this.conditionNames = conditionNames;
- this.fieldName = fieldNamePath;
-
- this.fieldProcessorCache = new WeakMap();
- }
-
- apply(resolver) {
- const target = resolver.ensureHook(this.target);
- resolver
- .getHook(this.source)
- .tapAsync("ExportsFieldPlugin", (request, resolveContext, callback) => {
-
- if (!request.descriptionFilePath) return callback();
- if (
-
-
- request.relativePath !== "." ||
- request.request === undefined
- )
- return callback();
- const remainingRequest =
- request.query || request.fragment
- ? (request.request === "." ? "./" : request.request) +
- request.query +
- request.fragment
- : request.request;
- const exportsField =
-
- (
- DescriptionFileUtils.getField(
- (request.descriptionFileData),
- this.fieldName
- )
- );
- if (!exportsField) return callback();
- if (request.directory) {
- return callback(
- new Error(
- `Resolving to directories is not possible with the exports field (request was ${remainingRequest}/)`
- )
- );
- }
-
- let paths;
- try {
-
-
-
- let fieldProcessor = this.fieldProcessorCache.get(
- (request.descriptionFileData)
- );
- if (fieldProcessor === undefined) {
- fieldProcessor = processExportsField(exportsField);
- this.fieldProcessorCache.set(
- (request.descriptionFileData),
- fieldProcessor
- );
- }
- paths = fieldProcessor(remainingRequest, this.conditionNames);
- } catch ( err) {
- if (resolveContext.log) {
- resolveContext.log(
- `Exports field in ${request.descriptionFilePath} can't be processed: ${err}`
- );
- }
- return callback( (err));
- }
- if (paths.length === 0) {
- return callback(
- new Error(
- `Package path ${remainingRequest} is not exported from package ${request.descriptionFileRoot} (see exports field in ${request.descriptionFilePath})`
- )
- );
- }
- forEachBail(
- paths,
-
- (p, callback) => {
- const parsedIdentifier = parseIdentifier(p);
- if (!parsedIdentifier) return callback();
- const [relativePath, query, fragment] = parsedIdentifier;
- const error = checkImportsExportsFieldTarget(relativePath);
- if (error) {
- return callback(error);
- }
-
- const obj = {
- ...request,
- request: undefined,
- path: path.join(
- (request.descriptionFileRoot),
- relativePath
- ),
- relativePath,
- query,
- fragment
- };
- resolver.doResolve(
- target,
- obj,
- "using exports field: " + p,
- resolveContext,
- callback
- );
- },
-
- (err, result) => callback(err, result || null)
- );
- });
- }
- };
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