# All files plugin.ts

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65.38% Branches 51/78
77.27% Functions 17/22
68.42% Lines 78/114

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     import * as chalk from "chalk";
    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>;

      referenceMatchMap: Record<string, TsconfigPaths.MatchPathAsync>;
      matchPath: TsconfigPaths.MatchPathAsync;

      constructor(IrawOptions: Partial<Options.Options> = {}) {
        const options = Options.getOptions(rawOptions);

        this.extensions = options.extensions;
        this.referenceMatchMap = {};

        // 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 = loadConfig(loadFrom, this.log);
        if (loadResult.resultType === "success") {
          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
          );

          if (options.references) {
            options.references.reduce((pathMap, reference) => {
              if (reference) {
                const referenceResult = loadConfig(reference, this.log);
                if (referenceResult.resultType === "success") {
                  const { paths, absoluteBaseUrl } = referenceResult;
                  pathMap[absoluteBaseUrl] = TsconfigPaths.createMatchPathAsync(
                    absoluteBaseUrl,
                    paths,
                    options.mainFields
                  );
                }
              }
              return pathMap;
            }, this.referenceMatchMap);
          }
        }
      }

      apply(resolver: Resolver): void {
        Iif (!resolver) {
          this.log.logWarning(
            "tsconfig-paths-webpack-plugin: Found no resolver, 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.referenceMatchMap,
                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 loadConfig(
      configPath: string,
      logger: Logger.Logger
    ): TsconfigPaths.ConfigLoaderResult {
      const loadResult = TsconfigPaths.loadConfig(configPath);
      Iif (loadResult.resultType === "failed") {
        logger.logError(`Failed to load ${configPath}: ${loadResult.message}`);
      } else {
        logger.logInfo(
          `tsconfig-paths-webpack-plugin: Using config file at ${loadResult.configFileAbsolutePath}`
        );
      }
      return loadResult;
    }

    function createPluginCallback(
      referenceMatchMap: Record<string, TsconfigPaths.MatchPathAsync>,
      baseMatchPath: TsconfigPaths.MatchPathAsync,
      resolver: Resolver,
      baseAbsoluteBaseUrl: 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();
        }

        // Find the base URL and matchPath instance
        // Quickly check if the request path is a known baseUrl
        // Then check if the path is a child of a reference baseUrl
        let absoluteBaseUrl = baseAbsoluteBaseUrl;
        if (
          typeof request.path === "string" &&
          request.path !== baseAbsoluteBaseUrl
        ) {
          if (referenceMatchMap[request.path]) {
            absoluteBaseUrl = request.path;
          } else {
            const referenceUrl = Object.keys(referenceMatchMap).find(
              (refBaseUrl) => {
                const relative = path.relative(refBaseUrl, request.path || "");
                return (
                  relative &&
                  !relative.startsWith("..") &&
                  !path.isAbsolute(relative)
                );
              }
            );
            if (referenceUrl) {
              absoluteBaseUrl = referenceUrl;
            }
          }
        }

        const matchPath = referenceMatchMap[absoluteBaseUrl] || baseMatchPath;

        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);
        });
      };
    }