forked from parcel-bundler/parcel
/
NodeResolver.js
1286 lines (1156 loc) Β· 34.3 KB
/
NodeResolver.js
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// @flow
import type {
FilePath,
FileCreateInvalidation,
PackageJSON,
ResolveResult,
Environment,
SpecifierType,
PluginLogger,
SourceLocation,
} from '@parcel/types';
import type {FileSystem} from '@parcel/fs';
import type {PackageManager} from '@parcel/package-manager';
import invariant from 'assert';
import path from 'path';
import {
isGlob,
relativePath,
normalizeSeparators,
findAlternativeNodeModules,
findAlternativeFiles,
loadConfig,
globToRegex,
isGlobMatch,
} from '@parcel/utils';
import ThrowableDiagnostic, {
generateJSONCodeHighlights,
md,
} from '@parcel/diagnostic';
import builtins, {empty} from './builtins';
import nullthrows from 'nullthrows';
import _Module from 'module';
import {fileURLToPath} from 'url';
const EMPTY_SHIM = require.resolve('./_empty');
type InternalPackageJSON = PackageJSON & {pkgdir: string, pkgfile: string, ...};
type Options = {|
fs: FileSystem,
projectRoot: FilePath,
extensions: Array<string>,
mainFields: Array<string>,
packageManager?: PackageManager,
logger?: PluginLogger,
|};
type ResolvedFile = {|
path: string,
pkg: InternalPackageJSON | null,
|};
type Aliases =
| string
| {[string]: string, ...}
| {[string]: string | boolean, ...};
type ResolvedAlias = {|
type: 'file' | 'global',
sourcePath: FilePath,
resolved: string,
|};
type Module = {|
moduleName?: string,
subPath?: ?string,
moduleDir?: FilePath,
filePath?: FilePath,
code?: string,
query?: URLSearchParams,
|};
type ResolverContext = {|
invalidateOnFileCreate: Array<FileCreateInvalidation>,
invalidateOnFileChange: Set<FilePath>,
specifierType: SpecifierType,
loc: ?SourceLocation,
|};
/**
* This resolver implements a modified version of the node_modules resolution algorithm:
* https://nodejs.org/api/modules.html#modules_all_together
*
* In addition to the standard algorithm, Parcel supports:
* - All file extensions supported by Parcel.
* - Glob file paths
* - Absolute paths (e.g. /foo) resolved relative to the project root.
* - Tilde paths (e.g. ~/foo) resolved relative to the nearest module root in node_modules.
* - The package.json module, jsnext:main, and browser field as replacements for package.main.
* - The package.json browser and alias fields as an alias map within a local module.
* - The package.json alias field in the root package for global aliases across all modules.
*/
export default class NodeResolver {
fs: FileSystem;
projectRoot: FilePath;
extensions: Array<string>;
mainFields: Array<string>;
packageCache: Map<string, InternalPackageJSON>;
rootPackage: InternalPackageJSON | null;
packageManager: ?PackageManager;
logger: ?PluginLogger;
constructor(opts: Options) {
this.extensions = opts.extensions.map(ext =>
ext.startsWith('.') ? ext : '.' + ext,
);
this.mainFields = opts.mainFields;
this.fs = opts.fs;
this.projectRoot = opts.projectRoot;
this.packageCache = new Map();
this.rootPackage = null;
this.packageManager = opts.packageManager;
this.logger = opts.logger;
}
async resolve({
filename,
parent,
specifierType,
env,
sourcePath,
loc,
}: {|
filename: FilePath,
parent: ?FilePath,
specifierType: SpecifierType,
env: Environment,
sourcePath?: ?FilePath,
loc?: ?SourceLocation,
|}): Promise<?ResolveResult> {
let ctx = {
invalidateOnFileCreate: [],
invalidateOnFileChange: new Set(),
specifierType,
loc,
};
// Get file extensions to search
let extensions = this.extensions.slice();
if (parent) {
// parent's extension given high priority
let parentExt = path.extname(parent);
extensions = [parentExt, ...extensions.filter(ext => ext !== parentExt)];
}
extensions.unshift('');
try {
// Resolve the module directory or local file path
let module = await this.resolveModule({
filename,
parent,
env,
ctx,
sourcePath,
});
if (!module) {
return {
isExcluded: true,
};
}
let resolved;
if (module.moduleDir) {
resolved = await this.loadNodeModules(module, extensions, env, ctx);
} else if (module.filePath) {
if (module.code != null) {
return {
filePath: await this.fs.realpath(module.filePath),
code: module.code,
invalidateOnFileCreate: ctx.invalidateOnFileCreate,
invalidateOnFileChange: [...ctx.invalidateOnFileChange],
query: module.query,
};
}
resolved = await this.loadRelative(
module.filePath,
extensions,
env,
parent ? path.dirname(parent) : this.projectRoot,
ctx,
);
}
if (resolved) {
let _resolved = resolved; // For Flow
return {
filePath: await this.fs.realpath(_resolved.path),
sideEffects:
_resolved.pkg && !this.hasSideEffects(_resolved.path, _resolved.pkg)
? false
: undefined,
invalidateOnFileCreate: ctx.invalidateOnFileCreate,
invalidateOnFileChange: [...ctx.invalidateOnFileChange],
query: module.query,
};
}
} catch (err) {
if (err instanceof ThrowableDiagnostic) {
return {
diagnostics: err.diagnostics,
invalidateOnFileCreate: ctx.invalidateOnFileCreate,
invalidateOnFileChange: [...ctx.invalidateOnFileChange],
};
} else {
throw err;
}
}
return null;
}
async resolveModule({
filename,
parent,
env,
ctx,
sourcePath,
}: {|
filename: string,
parent: ?FilePath,
env: Environment,
ctx: ResolverContext,
sourcePath: ?FilePath,
|}): Promise<?Module> {
let specifier = filename;
let sourceFile = parent || path.join(this.projectRoot, 'index');
let query;
// If this isn't the entrypoint, resolve the input file to an absolute path
if (parent) {
let res = await this.resolveFilename(
filename,
path.dirname(sourceFile),
ctx.specifierType,
);
if (!res) {
return null;
}
filename = res.filePath;
query = res.query;
}
// Resolve aliases in the parent module for this file.
let alias = await this.loadAlias(filename, sourceFile, env, ctx);
if (alias) {
if (alias.type === 'global') {
return {
filePath: path.join(this.projectRoot, `${alias.resolved}.js`),
code: `module.exports=${alias.resolved};`,
query,
};
}
filename = alias.resolved;
}
// Return just the file path if this is a file, not in node_modules
if (path.isAbsolute(filename)) {
return {
filePath: filename,
query,
};
}
let builtin = this.findBuiltin(filename, env);
if (builtin === null) {
return null;
} else if (builtin === empty) {
return {filePath: empty};
} else if (builtin !== undefined) {
filename = builtin;
}
if (this.shouldIncludeNodeModule(env, filename) === false) {
if (sourcePath && env.isLibrary && !builtin) {
await this.checkExcludedDependency(sourcePath, filename, ctx);
}
return null;
}
// Resolve the module in node_modules
let resolved: ?Module;
try {
resolved = this.findNodeModulePath(filename, sourceFile, ctx);
} catch (err) {
// ignore
}
// Auto install node builtin polyfills if not already available
if (resolved === undefined && builtin != null) {
let packageName = builtin.split('/')[0];
let packageManager = this.packageManager;
if (packageManager) {
this.logger?.warn({
message: md`Auto installing polyfill for Node builtin module "${specifier}"...`,
codeFrames: [
{
filePath: ctx.loc?.filePath ?? sourceFile,
codeHighlights: ctx.loc
? [
{
message: 'used here',
start: ctx.loc.start,
end: ctx.loc.end,
},
]
: [],
},
],
documentationURL:
'https://parceljs.org/features/node-emulation/#polyfilling-%26-excluding-builtin-node-modules',
});
await packageManager.resolve(builtin, this.projectRoot + '/index', {
saveDev: true,
shouldAutoInstall: true,
});
// Re-resolve
try {
resolved = this.findNodeModulePath(filename, sourceFile, ctx);
} catch (err) {
// ignore
}
} else {
throw new ThrowableDiagnostic({
diagnostic: {
message: md`Node builtin polyfill "${packageName}" is not installed, but auto install is disabled.`,
codeFrames: [
{
filePath: ctx.loc?.filePath ?? sourceFile,
codeHighlights: ctx.loc
? [
{
message: 'used here',
start: ctx.loc.start,
end: ctx.loc.end,
},
]
: [],
},
],
documentationURL:
'https://parceljs.org/features/node-emulation/#polyfilling-%26-excluding-builtin-node-modules',
hints: [
md`Install the "${packageName}" package with your package manager, and run Parcel again.`,
],
},
});
}
}
if (resolved === undefined && process.versions.pnp != null && parent) {
try {
let [moduleName, subPath] = this.getModuleParts(filename);
// $FlowFixMe[prop-missing]
let pnp = _Module.findPnpApi(path.dirname(parent));
let res = pnp.resolveToUnqualified(
moduleName +
// retain slash in `require('assert/')` to force loading builtin from npm
(filename[moduleName.length] === '/' ? '/' : ''),
parent,
);
resolved = {
moduleName,
subPath,
moduleDir: res,
filePath: path.join(res, subPath || ''),
};
// Invalidate whenever the .pnp.js file changes.
ctx.invalidateOnFileChange.add(
pnp.resolveToUnqualified('pnpapi', null),
);
} catch (e) {
if (e.code !== 'MODULE_NOT_FOUND') {
return null;
}
}
}
// If we couldn't resolve the node_modules path, just return the module name info
if (resolved === undefined) {
let [moduleName, subPath] = this.getModuleParts(filename);
resolved = {
moduleName,
subPath,
};
let alternativeModules = await findAlternativeNodeModules(
this.fs,
moduleName,
path.dirname(sourceFile),
);
if (alternativeModules.length) {
throw new ThrowableDiagnostic({
diagnostic: {
message: md`Cannot find module ${nullthrows(resolved?.moduleName)}`,
hints: alternativeModules.map(r => {
return `Did you mean '__${r}__'?`;
}),
},
});
}
}
if (resolved != null) {
resolved.query = query;
}
return resolved;
}
shouldIncludeNodeModule(
{includeNodeModules}: Environment,
name: string,
): ?boolean {
if (includeNodeModules === false) {
return false;
}
if (Array.isArray(includeNodeModules)) {
let [moduleName] = this.getModuleParts(name);
return includeNodeModules.includes(moduleName);
}
if (includeNodeModules && typeof includeNodeModules === 'object') {
let [moduleName] = this.getModuleParts(name);
let include = includeNodeModules[moduleName];
if (include != null) {
return !!include;
}
}
}
async checkExcludedDependency(
sourceFile: FilePath,
name: string,
ctx: ResolverContext,
) {
let [moduleName] = this.getModuleParts(name);
let pkg = await this.findPackage(sourceFile, ctx);
if (!pkg) {
return;
}
if (
!pkg.dependencies?.[moduleName] &&
!pkg.peerDependencies?.[moduleName] &&
!pkg.engines?.[moduleName]
) {
let pkgContent = await this.fs.readFile(pkg.pkgfile, 'utf8');
throw new ThrowableDiagnostic({
diagnostic: {
message: md`External dependency "${moduleName}" is not declared in package.json.`,
codeFrames: [
{
filePath: pkg.pkgfile,
language: 'json',
code: pkgContent,
codeHighlights: pkg.dependencies
? generateJSONCodeHighlights(pkgContent, [
{
key: `/dependencies`,
type: 'key',
},
])
: [
{
start: {
line: 1,
column: 1,
},
end: {
line: 1,
column: 1,
},
},
],
},
],
hints: [`Add "${moduleName}" as a dependency.`],
},
});
}
}
async resolveFilename(
filename: string,
dir: string,
specifierType: SpecifierType,
): Promise<?{|filePath: string, query?: URLSearchParams|}> {
let url;
switch (filename[0]) {
case '/': {
if (specifierType === 'url' && filename[1] === '/') {
// A protocol-relative URL, e.g `url('//example.com/foo.png')`. Ignore.
return null;
}
// Absolute path. Resolve relative to project root.
dir = this.projectRoot;
filename = '.' + filename;
break;
}
case '~': {
// Tilde path. Resolve relative to nearest node_modules directory,
// the nearest directory with package.json or the project root - whichever comes first.
const insideNodeModules = dir.includes('node_modules');
while (
dir !== this.projectRoot &&
path.basename(path.dirname(dir)) !== 'node_modules' &&
(insideNodeModules ||
!(await this.fs.exists(path.join(dir, 'package.json'))))
) {
dir = path.dirname(dir);
if (dir === path.dirname(dir)) {
dir = this.projectRoot;
break;
}
}
filename = filename.slice(1);
if (filename[0] === '/' || filename[0] === '\\') {
filename = '.' + filename;
}
break;
}
case '.': {
// Relative path.
break;
}
case '#': {
if (specifierType === 'url') {
// An ID-only URL, e.g. `url(#clip-path)` for CSS rules. Ignore.
return null;
}
break;
}
default: {
// Bare specifier. If this is a URL, it's treated as relative,
// otherwise as a node_modules package.
if (specifierType === 'esm') {
// Try parsing as a URL first in case there is a scheme.
// Otherwise, fall back to an `npm:` specifier, parsed below.
try {
url = new URL(filename);
} catch (e) {
filename = 'npm:' + filename;
}
} else if (specifierType === 'commonjs') {
return {
filePath: filename,
};
}
}
}
// If this is a URL dependency or ESM specifier, parse as a URL.
// Otherwise, if this is CommonJS, parse as a platform path.
if (specifierType === 'url' || specifierType === 'esm') {
url = url ?? new URL(filename, `file:${dir}/index`);
let filePath;
if (url.protocol === 'npm:') {
// The `npm:` scheme allows URLs to resolve to node_modules packages.
filePath = decodeURIComponent(url.pathname);
} else if (url.protocol === 'node:') {
// Preserve the `node:` prefix for use later.
// Node does not URL decode or support query params here.
// See https://github.com/nodejs/node/issues/39710.
return {
filePath: filename,
};
} else if (url.protocol === 'file:') {
// $FlowFixMe
filePath = fileURLToPath(url);
} else if (specifierType === 'url') {
// Don't handle other protocols like http:
return null;
} else {
// Throw on unsupported url schemes in ESM dependencies.
// We may support http: or data: urls eventually.
throw new ThrowableDiagnostic({
diagnostic: {
message: `Unknown url scheme or pipeline '${url.protocol}'`,
},
});
}
return {
filePath,
query: url.search ? new URLSearchParams(url.search) : undefined,
};
} else {
// CommonJS specifier. Query params are not supported.
return {
filePath: path.resolve(dir, filename),
};
}
}
async loadRelative(
filename: string,
extensions: Array<string>,
env: Environment,
parentdir: string,
ctx: ResolverContext,
): Promise<?ResolvedFile> {
// Find a package.json file in the current package.
let pkg = await this.findPackage(filename, ctx);
// First try as a file, then as a directory.
let resolvedFile = await this.loadAsFile({
file: filename,
extensions,
env,
pkg,
ctx,
});
// Don't load as a directory if this is a URL dependency.
if (!resolvedFile && ctx.specifierType !== 'url') {
resolvedFile = await this.loadDirectory({
dir: filename,
extensions,
env,
ctx,
pkg,
});
}
if (!resolvedFile) {
// If we can't load the file do a fuzzySearch for potential hints
let relativeFileSpecifier = relativePath(parentdir, filename);
let potentialFiles = await findAlternativeFiles(
this.fs,
relativeFileSpecifier,
parentdir,
this.projectRoot,
true,
ctx.specifierType !== 'url',
extensions.length === 0,
);
throw new ThrowableDiagnostic({
diagnostic: {
message: md`Cannot load file '${relativeFileSpecifier}' in '${relativePath(
this.projectRoot,
parentdir,
)}'.`,
hints: potentialFiles.map(r => {
return `Did you mean '__${r}__'?`;
}),
},
});
}
return resolvedFile;
}
findBuiltin(filename: string, env: Environment): ?string {
const isExplicitNode = filename.startsWith('node:');
if (isExplicitNode || builtins[filename]) {
if (env.isNode()) {
return null;
}
if (isExplicitNode) {
filename = filename.substr(5);
}
// By default, exclude node builtins from libraries unless explicitly opted in.
if (
env.isLibrary &&
this.shouldIncludeNodeModule(env, filename) !== true
) {
return null;
}
return builtins[filename] || empty;
}
if (env.isElectron() && filename === 'electron') {
return null;
}
}
findNodeModulePath(
filename: string,
sourceFile: FilePath,
ctx: ResolverContext,
): ?Module {
let [moduleName, subPath] = this.getModuleParts(filename);
ctx.invalidateOnFileCreate.push({
fileName: `node_modules/${moduleName}`,
aboveFilePath: sourceFile,
});
let dir = path.dirname(sourceFile);
let moduleDir = this.fs.findNodeModule(moduleName, dir);
if (moduleDir) {
return {
moduleName,
subPath,
moduleDir,
filePath: subPath ? path.join(moduleDir, subPath) : moduleDir,
};
}
return undefined;
}
async loadNodeModules(
module: Module,
extensions: Array<string>,
env: Environment,
ctx: ResolverContext,
): Promise<?ResolvedFile> {
// If a module was specified as a module sub-path (e.g. some-module/some/path),
// it is likely a file. Try loading it as a file first.
if (module.subPath && module.moduleDir) {
let pkg = await this.readPackage(module.moduleDir, ctx);
let res = await this.loadAsFile({
file: nullthrows(module.filePath),
extensions,
env,
pkg,
ctx,
});
if (res) {
return res;
}
}
// Otherwise, load as a directory.
return this.loadDirectory({
dir: nullthrows(module.filePath),
extensions,
env,
ctx,
});
}
async loadDirectory({
dir,
extensions,
env,
ctx,
pkg,
}: {|
dir: string,
extensions: Array<string>,
env: Environment,
ctx: ResolverContext,
pkg?: InternalPackageJSON | null,
|}): Promise<?ResolvedFile> {
let failedEntry;
try {
pkg = await this.readPackage(dir, ctx);
if (pkg) {
// Get a list of possible package entry points.
let entries = this.getPackageEntries(pkg, env);
for (let entry of entries) {
// First try loading package.main as a file, then try as a directory.
let res =
(await this.loadAsFile({
file: entry.filename,
extensions,
env,
pkg,
ctx,
})) ||
(await this.loadDirectory({
dir: entry.filename,
extensions,
env,
pkg,
ctx,
}));
if (res) {
return res;
} else {
failedEntry = entry;
throw new Error('');
}
}
}
} catch (e) {
if (failedEntry && pkg) {
// If loading the entry failed, try to load an index file, and fall back
// to it if it exists.
let indexFallback = await this.loadAsFile({
file: path.join(dir, 'index'),
extensions,
env,
pkg,
ctx,
});
if (indexFallback != null) {
return indexFallback;
}
let fileSpecifier = relativePath(dir, failedEntry.filename);
let alternatives = await findAlternativeFiles(
this.fs,
fileSpecifier,
pkg.pkgdir,
this.projectRoot,
);
let alternative = alternatives[0];
let pkgContent = await this.fs.readFile(pkg.pkgfile, 'utf8');
throw new ThrowableDiagnostic({
diagnostic: {
message: md`Could not load '${fileSpecifier}' from module '${pkg.name}' found in package.json#${failedEntry.field}`,
codeFrames: [
{
filePath: pkg.pkgfile,
language: 'json',
code: pkgContent,
codeHighlights: generateJSONCodeHighlights(pkgContent, [
{
key: `/${failedEntry.field}`,
type: 'value',
message: md`'${fileSpecifier}' does not exist${
alternative ? `, did you mean '${alternative}'?` : ''
}'`,
},
]),
},
],
},
});
}
}
// Skip index fallback unless this is actually a directory.
try {
if (!(await this.fs.stat(dir)).isDirectory()) {
return;
}
} catch (err) {
return;
}
// Fall back to an index file inside the directory.
return this.loadAsFile({
file: path.join(dir, 'index'),
extensions,
env,
pkg: pkg ?? (await this.findPackage(path.join(dir, 'index'), ctx)),
ctx,
});
}
async readPackage(
dir: string,
ctx: ResolverContext,
): Promise<InternalPackageJSON> {
let file = path.join(dir, 'package.json');
let cached = this.packageCache.get(file);
if (cached) {
ctx.invalidateOnFileChange.add(cached.pkgfile);
return cached;
}
let json;
try {
json = await this.fs.readFile(file, 'utf8');
} catch (err) {
// If the package.json doesn't exist, watch for it to be created.
ctx.invalidateOnFileCreate.push({
filePath: file,
});
throw err;
}
// Add the invalidation *before* we try to parse the JSON in case of errors
// so that changes are picked up if the file is edited to fix the error.
ctx.invalidateOnFileChange.add(file);
let pkg = JSON.parse(json);
await this.processPackage(pkg, file, dir);
this.packageCache.set(file, pkg);
return pkg;
}
async processPackage(pkg: InternalPackageJSON, file: string, dir: string) {
pkg.pkgfile = file;
pkg.pkgdir = dir;
// If the package has a `source` field, make sure
// - the package is behind symlinks
// - and the realpath to the packages does not includes `node_modules`.
// Since such package is likely a pre-compiled module
// installed with package managers, rather than including a source code.
if (pkg.source) {
let realpath = await this.fs.realpath(file);
if (realpath === file || realpath.includes('/node_modules/')) {
delete pkg.source;
}
}
}
getPackageEntries(
pkg: InternalPackageJSON,
env: Environment,
): Array<{|
filename: string,
field: string,
|}> {
return this.mainFields
.map(field => {
if (field === 'browser' && pkg.browser != null) {
if (!env.isBrowser()) {
return null;
} else if (typeof pkg.browser === 'string') {
return {field, filename: pkg.browser};
} else if (typeof pkg.browser === 'object' && pkg.browser[pkg.name]) {
return {
field: `browser/${pkg.name}`,
filename: pkg.browser[pkg.name],
};
}
}
return {
field,
filename: pkg[field],
};
})
.filter(
entry => entry && entry.filename && typeof entry.filename === 'string',
)
.map(entry => {
invariant(entry != null && typeof entry.filename === 'string');
// Current dir refers to an index file
if (entry.filename === '.' || entry.filename === './') {
entry.filename = 'index';
}
return {
field: entry.field,
filename: path.resolve(pkg.pkgdir, entry.filename),
};
});
}
async loadAsFile({
file,
extensions,
env,
pkg,
ctx,
}: {|
file: string,
extensions: Array<string>,
env: Environment,
pkg: InternalPackageJSON | null,
ctx: ResolverContext,
|}): Promise<?ResolvedFile> {
// Try all supported extensions
let files = await this.expandFile(file, extensions, env, pkg);
let found = this.fs.findFirstFile(files);
// Add invalidations for higher priority files so we
// re-resolve if any of them are created.
for (let file of files) {
if (file === found) {
break;
}
ctx.invalidateOnFileCreate.push({
filePath: file,
});
}
if (found) {
return {path: found, pkg};
}
return null;