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resolveImportSpecifiers.js
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resolveImportSpecifiers.js
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import fs from 'fs';
import { promisify } from 'util';
import { fileURLToPath, pathToFileURL } from 'url';
import resolve from 'resolve';
import { getPackageInfo, getPackageName } from './util';
import { resolveSymlink } from './fs';
import { isDirCached, isFileCached, readCachedFile } from './cache';
import resolvePackageExports from './package/resolvePackageExports';
import resolvePackageImports from './package/resolvePackageImports';
import { findPackageJson, ResolveError } from './package/utils';
const resolveImportPath = promisify(resolve);
const readFile = promisify(fs.readFile);
async function getPackageJson(importer, pkgName, resolveOptions, moduleDirectories) {
if (importer) {
const selfPackageJsonResult = await findPackageJson(importer, moduleDirectories);
if (selfPackageJsonResult && selfPackageJsonResult.pkgJson.name === pkgName) {
// the referenced package name is the current package
return selfPackageJsonResult;
}
}
try {
const pkgJsonPath = await resolveImportPath(`${pkgName}/package.json`, resolveOptions);
const pkgJson = JSON.parse(await readFile(pkgJsonPath, 'utf-8'));
return { pkgJsonPath, pkgJson };
} catch (_) {
return null;
}
}
async function resolveIdClassic({
importSpecifier,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
}) {
let hasModuleSideEffects = () => null;
let hasPackageEntry = true;
let packageBrowserField = false;
let packageInfo;
const filter = (pkg, pkgPath) => {
const info = getPackageInfo({
cache: packageInfoCache,
extensions,
pkg,
pkgPath,
mainFields,
preserveSymlinks,
useBrowserOverrides,
rootDir,
ignoreSideEffectsForRoot
});
({ packageInfo, hasModuleSideEffects, hasPackageEntry, packageBrowserField } = info);
return info.cachedPkg;
};
const resolveOptions = {
basedir: baseDir,
readFile: readCachedFile,
isFile: isFileCached,
isDirectory: isDirCached,
extensions,
includeCoreModules: false,
moduleDirectory: moduleDirectories,
preserveSymlinks,
packageFilter: filter
};
let location;
try {
location = await resolveImportPath(importSpecifier, resolveOptions);
} catch (error) {
if (error.code !== 'MODULE_NOT_FOUND') {
throw error;
}
return null;
}
return {
location: preserveSymlinks ? location : await resolveSymlink(location),
hasModuleSideEffects,
hasPackageEntry,
packageBrowserField,
packageInfo
};
}
async function resolveWithExportMap({
importer,
importSpecifier,
exportConditions,
warn,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
}) {
if (importSpecifier.startsWith('#')) {
// this is a package internal import, resolve using package imports field
const resolveResult = await resolvePackageImports({
importSpecifier,
importer,
moduleDirs: moduleDirectories,
conditions: exportConditions,
resolveId(id /*, parent*/) {
return resolveIdClassic({
importSpecifier: id,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories
});
}
});
const location = fileURLToPath(resolveResult);
return {
location: preserveSymlinks ? location : await resolveSymlink(location),
hasModuleSideEffects: () => null,
hasPackageEntry: true,
packageBrowserField: false,
// eslint-disable-next-line no-undefined
packageInfo: undefined
};
}
const pkgName = getPackageName(importSpecifier);
if (pkgName) {
// it's a bare import, find the package.json and resolve using package exports if available
let hasModuleSideEffects = () => null;
let hasPackageEntry = true;
let packageBrowserField = false;
let packageInfo;
const filter = (pkg, pkgPath) => {
const info = getPackageInfo({
cache: packageInfoCache,
extensions,
pkg,
pkgPath,
mainFields,
preserveSymlinks,
useBrowserOverrides,
rootDir,
ignoreSideEffectsForRoot
});
({ packageInfo, hasModuleSideEffects, hasPackageEntry, packageBrowserField } = info);
return info.cachedPkg;
};
const resolveOptions = {
basedir: baseDir,
readFile: readCachedFile,
isFile: isFileCached,
isDirectory: isDirCached,
extensions,
includeCoreModules: false,
moduleDirectory: moduleDirectories,
preserveSymlinks,
packageFilter: filter
};
const result = await getPackageJson(importer, pkgName, resolveOptions, moduleDirectories);
if (result && result.pkgJson.exports) {
const { pkgJson, pkgJsonPath } = result;
try {
const subpath =
pkgName === importSpecifier ? '.' : `.${importSpecifier.substring(pkgName.length)}`;
const pkgDr = pkgJsonPath.replace('package.json', '');
const pkgURL = pathToFileURL(pkgDr);
const context = {
importer,
importSpecifier,
moduleDirs: moduleDirectories,
pkgURL,
pkgJsonPath,
conditions: exportConditions
};
const resolvedPackageExport = await resolvePackageExports(
context,
subpath,
pkgJson.exports
);
const location = fileURLToPath(resolvedPackageExport);
if (location) {
return {
location: preserveSymlinks ? location : await resolveSymlink(location),
hasModuleSideEffects,
hasPackageEntry,
packageBrowserField,
packageInfo
};
}
} catch (error) {
if (error instanceof ResolveError) {
warn(error);
return null;
}
throw error;
}
}
}
return null;
}
async function resolveWithClassic({
importer,
importSpecifierList,
exportConditions,
warn,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
}) {
for (let i = 0; i < importSpecifierList.length; i++) {
// eslint-disable-next-line no-await-in-loop
const result = await resolveIdClassic({
importer,
importSpecifier: importSpecifierList[i],
exportConditions,
warn,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
});
if (result) {
return result;
}
}
return null;
}
// Resolve module specifiers in order. Promise resolves to the first module that resolves
// successfully, or the error that resulted from the last attempted module resolution.
export default async function resolveImportSpecifiers({
importer,
importSpecifierList,
exportConditions,
warn,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
}) {
const exportMapRes = await resolveWithExportMap({
importer,
importSpecifier: importSpecifierList[0],
exportConditions,
warn,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
});
if (exportMapRes) return exportMapRes;
// package has no imports or exports, use classic node resolve
return resolveWithClassic({
importer,
importSpecifierList,
exportConditions,
warn,
packageInfoCache,
extensions,
mainFields,
preserveSymlinks,
useBrowserOverrides,
baseDir,
moduleDirectories,
rootDir,
ignoreSideEffectsForRoot
});
}