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import * as TsconfigPaths from "tsconfig-paths";
import * as path from "path";
import * as Options from "./options";
import * as Logger from "./logger";
import * as fs from "fs";
import { ResolvePluginInstance, Resolver } from "webpack";
import { ResolveRequest, ResolveContext } from "enhanced-resolve";
type FileSystem = Resolver["fileSystem"];
type TapAsyncCallback = (
request: ResolveRequest,
context: ResolveContext,
callback: TapAsyncInnerCallback
) => void;
type TapAsyncInnerCallback = (
error?: Error | null | false,
result?: null | ResolveRequest
) => void;
export interface LegacyResolverPlugin {
readonly apply: (resolver: LegacyResolver) => void;
}
export interface LegacyResolver {
readonly apply: (plugin: LegacyResolverPlugin) => void;
readonly plugin: (source: string, cb: ResolverCallbackLegacy) => void;
readonly doResolve: doResolveLegacy | doResolve;
readonly join: (relativePath: string, innerRequest: Request) => Request;
readonly fileSystem: LegacyResolverFileSystem;
readonly getHook: (hook: string) => Tapable;
}
export type doResolveLegacy = (
target: string,
req: Request,
desc: string,
callback: Callback
) => void;
export type doResolve = (
hook: Tapable,
req: Request,
message: string,
resolveContext: LegacyResolveContext,
callback: Callback
) => void;
export type ReadJsonCallback = (error: Error | undefined, result?: {}) => void;
export type ReadJson = (path2: string, callback: ReadJsonCallback) => void;
export type LegacyResolverFileSystem = typeof fs & { readJson?: ReadJson };
export interface LegacyResolveContext {
log?: string;
stack?: string;
missing?: string;
}
export interface Tapable {
readonly tapAsync: (
options: TapableOptions,
callback: TapAsyncCallback
) => void;
}
export interface TapableOptions {
readonly name: string;
}
export type ResolverCallbackLegacy = (
request: Request,
callback: Callback
) => void;
export type ResolverCallback = (
request: Request,
resolveContext: LegacyResolveContext,
callback: Callback
) => void;
type CreateInnerCallback = (
callback: Callback,
options: Callback,
message?: string,
messageOptional?: string
) => Callback;
type CreateInnerContext = (
options: {
log?: string;
stack?: string;
missing?: string;
},
message?: string,
messageOptional?: string
) => ResolveContext;
type getInnerRequest = (
resolver: Resolver | LegacyResolver,
request: ResolveRequest | Request
) => string;
export interface Request {
readonly request?: Request | string;
readonly relativePath: string;
readonly path: string;
readonly context: {
readonly issuer: string;
};
}
export interface Callback {
(err?: Error, result?: string): void;
log?: string;
stack?: string;
missing?: string;
}
// eslint-disable-next-line no-redeclare
const getInnerRequest: getInnerRequest = require("enhanced-resolve/lib/getInnerRequest");
export class TsconfigPathsPlugin implements ResolvePluginInstance {
source: string = "described-resolve";
target: string = "resolve";
log: Logger.Logger;
baseUrl: string | undefined;
absoluteBaseUrl: string;
extensions: ReadonlyArray<string>;
matchPath: TsconfigPaths.MatchPathAsync;
constructor(IrawOptions: Partial<Options.Options> = {}) {
const options = Options.getOptions(rawOptions);
this.extensions = options.extensions;
// const colors = new chalk.constructor({ enabled: options.colors });
this.log = Logger.makeLogger(
options,
new chalk.Instance({ level: options.colors ? undefined : 0 })
);
const context = options.context || process.cwd();
const loadFrom = options.configFile || context;
const loadResult = TsconfigPaths.loadConfig(loadFrom);
Iif (loadResult.resultType === "failed") {
this.log.logError(`Failed to load ${loadFrom}: ${loadResult.message}`);
} else {
this.log.logInfo(
`tsconfig-paths-webpack-plugin: Using config file at ${loadResult.configFileAbsolutePath}`
);
this.baseUrl = options.baseUrl || loadResult.baseUrl;
this.absoluteBaseUrl = options.baseUrl
? path.resolve(options.baseUrl)
: loadResult.absoluteBaseUrl;
this.matchPath = TsconfigPaths.createMatchPathAsync(
this.absoluteBaseUrl,
loadResult.paths,
options.mainFields
);
}
}
apply(resolver: Resolver): void {
Iif (!resolver) {
this.log.logWarning(
"tsconfig-paths-webpack-plugin: Found no resolver, not applying tsconfig-paths-webpack-plugin"
);
return;
}
const { baseUrl } = this;
Iif (!baseUrl) {
// Nothing to do if there is no baseUrl
this.log.logWarning(
"tsconfig-paths-webpack-plugin: Found no baseUrl in tsconfig.json, not applying tsconfig-paths-webpack-plugin"
);
return;
}
// The file system only exists when the plugin is in the resolve context. This means it's also properly placed in the resolve.plugins array.
// If not, we should warn the user that this plugin should be placed in resolve.plugins and not the plugins array of the root config for example.
// This should hopefully prevent issues like: https://github.com/dividab/tsconfig-paths-webpack-plugin/issues/9
Iif (!("fileSystem" in resolver)) {
this.log.logWarning(
"tsconfig-paths-webpack-plugin: No file system found on resolver." +
" Please make sure you've placed the plugin in the correct part of the configuration." +
" This plugin is a resolver plugin and should be placed in the resolve part of the Webpack configuration."
);
return;
}
// getHook will only exist in Webpack 4 & 5, if so we should comply to the Webpack 4 plugin system.
if ("getHook" in resolver && typeof resolver.getHook === "function") {
resolver
.getHook(this.source)
.tapAsync(
{ name: "TsconfigPathsPlugin" },
createPluginCallback(
this.matchPath,
resolver,
this.absoluteBaseUrl,
resolver.getHook(this.target),
this.extensions
)
);
} else IEif ("plugin" in resolver) {
// This is the legacy (Webpack < 4.0.0) way of using the plugin system.
const legacyResolver = (resolver as unknown) as LegacyResolver;
legacyResolver.plugin(
this.source,
createPluginLegacy(
this.matchPath,
(resolver as unknown) as LegacyResolver,
this.absoluteBaseUrl,
this.target,
this.extensions
)
);
}
}
}
function createPluginCallback(
matchPath: TsconfigPaths.MatchPathAsync,
resolver: Resolver,
absoluteBaseUrl: string,
hook: Tapable,
extensions: ReadonlyArray<string>
): TapAsyncCallback {
const fileExistAsync = createFileExistAsync(resolver.fileSystem);
const readJsonAsync = createReadJsonAsync(resolver.fileSystem);
return (
request: ResolveRequest,
resolveContext: ResolveContext,
callback: TapAsyncInnerCallback
) => {
const innerRequest = getInnerRequest(resolver, request);
Iif (
!innerRequest ||
request?.request?.startsWith(".") ||
request?.request?.startsWith("..")
) {
return callback();
}
matchPath(
innerRequest,
readJsonAsync,
fileExistAsync,
extensions,
(err, foundMatch) => {
Iif (err) {
return callback(err);
}
if (!foundMatch) {
return callback();
}
const newRequest = {
...request,
request: foundMatch,
path: absoluteBaseUrl,
};
// Only at this point we are sure we are dealing with the latest Webpack version (>= 4.0.0)
// So only now can we require the createInnerContext function.
// (It doesn't exist in legacy versions)
const createInnerContext: CreateInnerContext = require("enhanced-resolve/lib/createInnerContext");
return resolver.doResolve(
hook,
newRequest as never,
`Resolved request '${innerRequest}' to '${foundMatch}' using tsconfig.json paths mapping`,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
createInnerContext({ ...(resolveContext as any) }),
(err2: Error, result2: ResolveRequest): void => {
// Pattern taken from:
// https://github.com/webpack/enhanced-resolve/blob/42ff594140582c3f8f86811f95dea7bf6774a1c8/lib/AliasPlugin.js#L44
Iif (err2) {
return callback(err2);
}
// Don't allow other aliasing or raw request
Iif (result2 === undefined) {
return callback(undefined, undefined);
}
callback(undefined, result2);
}
);
}
);
};
}
function createPluginLegacy(
matchPath: TsconfigPaths.MatchPathAsync,
resolver: LegacyResolver,
absoluteBaseUrl: string,
target: string,
extensions: ReadonlyArray<string>
): ResolverCallbackLegacy {
const fileExistAsync = createFileExistAsync(resolver.fileSystem);
const readJsonAsync = createReadJsonAsync(resolver.fileSystem);
return (request, callback) => {
const innerRequest = getInnerRequest(resolver, request);
Iif (
!innerRequest ||
innerRequest.startsWith(".") ||
innerRequest.startsWith("..")
) {
return callback();
}
matchPath(
innerRequest,
readJsonAsync,
fileExistAsync,
extensions,
(err, foundMatch) => {
Iif (err) {
return callback(err);
}
Iif (!foundMatch) {
return callback();
}
const newRequest = {
...request,
request: foundMatch,
path: absoluteBaseUrl,
};
// Only at this point we are sure we are dealing with a legacy Webpack version (< 4.0.0)
// So only now can we require the createInnerCallback function.
// (It's already deprecated and might be removed down the line).
const createInnerCallback: CreateInnerCallback = require("enhanced-resolve/lib/createInnerCallback");
return (resolver.doResolve as doResolveLegacy)(
target,
newRequest,
`Resolved request '${innerRequest}' to '${foundMatch}' using tsconfig.json paths mapping`,
createInnerCallback(function (err2: Error, result2: string): void {
// Note:
// *NOT* using an arrow function here because arguments.length implies we have "this"
// That means "this" has to be in the current function scope, and not the scope above.
// Pattern taken from:
// https://github.com/s-panferov/awesome-typescript-loader/blob/10653beff85f555f1f3b5d4bfd7d21513d0e54a4/src/paths-plugin.ts#L169
Iif (arguments.length > 0) {
return callback(err2, result2);
}
// don't allow other aliasing or raw request
callback(undefined, undefined);
}, callback)
);
}
);
};
}
function readJson(
fileSystem: FileSystem,
path2: string,
callback: ReadJsonCallback
): void {
if ("readJson" in fileSystem && fileSystem.readJson) {
return fileSystem.readJson(path2, callback);
}
fileSystem.readFile(path2, (err, buf) => {
Iif (err) {
return callback(err);
}
let data;
try {
// @ts-ignore This will crash if buf is undefined, which I guess it can be...
data = JSON.parse(buf.toString("utf-8"));
} catch (e) {
return callback(e);
}
return callback(undefined, data);
});
}
function createReadJsonAsync(
filesystem: FileSystem
): TsconfigPaths.ReadJsonAsync {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return (path2: string, callback2: (err?: Error, content?: any) => void) => {
readJson(filesystem, path2, (err, json) => {
// If error assume file does not exist
if (err || !json) {
callback2();
return;
}
callback2(undefined, json);
});
};
}
function createFileExistAsync(
filesystem: FileSystem
): TsconfigPaths.FileExistsAsync {
return (
path2: string,
callback2: (err?: Error, exists?: boolean) => void
) => {
filesystem.stat(path2, (err: Error, stats: fs.Stats) => {
// If error assume file does not exist
if (err) {
callback2(undefined, false);
return;
}
callback2(undefined, stats ? stats.isFile() : false);
});
};
}
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