Use regular imports instead of require where possible

package.json

@@ -44,6 +44,7 @@
         "@esfx/canceltoken": "^1.0.0",
         "@octokit/rest": "^20.1.1",
         "@types/chai": "^4.3.16",
+        "@types/diff": "^5.2.1",
         "@types/minimist": "^1.2.5",
         "@types/mocha": "^10.0.6",
         "@types/ms": "^0.7.34",

src/harness/fourslashImpl.ts

@@ -1,3 +1,4 @@
+import sourceMapSupport from "source-map-support";
 import * as fakes from "./_namespaces/fakes.js";
 import * as FourSlashInterface from "./_namespaces/FourSlashInterface.js";
 import * as Harness from "./_namespaces/Harness.js";
@@ -4659,22 +4660,9 @@ function runCode(code: string, state: TestState, fileName: string): void {
     const generatedFile = ts.changeExtension(fileName, ".js");
     const wrappedCode = `(function(ts, test, goTo, config, verify, edit, debug, format, cancellation, classification, completion, verifyOperationIsCancelled, ignoreInterpolations) {${code}\n//# sourceURL=${ts.getBaseFileName(generatedFile)}\n})`;
 
-    type SourceMapSupportModule = typeof import("source-map-support") & {
-        // TODO(rbuckton): This is missing from the DT definitions and needs to be added.
-        resetRetrieveHandlers(): void;
-    };
-
     // Provide the content of the current test to 'source-map-support' so that it can give us the correct source positions
     // for test failures.
-    let sourceMapSupportModule: SourceMapSupportModule | undefined;
-    try {
-        sourceMapSupportModule = require("source-map-support");
-    }
-    catch {
-        // do nothing
-    }
-
-    sourceMapSupportModule?.install({
+    sourceMapSupport.install({
         retrieveFile: path => {
             return path === generatedFile ? wrappedCode :
                 undefined!;
@@ -4700,7 +4688,7 @@ function runCode(code: string, state: TestState, fileName: string): void {
         throw err;
     }
     finally {
-        sourceMapSupportModule?.resetRetrieveHandlers();
+        sourceMapSupport.resetRetrieveHandlers();
     }
 }
 

src/harness/harnessIO.ts

@@ -1,3 +1,6 @@
+import * as Diff from "diff";
+import fs from "fs";
+import pathModule from "path";
 import * as compiler from "./_namespaces/compiler.js";
 import * as documents from "./_namespaces/documents.js";
 import * as fakes from "./_namespaces/fakes.js";
@@ -54,14 +57,6 @@ export const virtualFileSystemRoot = "/";
 
 function createNodeIO(): IO {
     const workspaceRoot = Utils.findUpRoot();
-    let fs: any, pathModule: any;
-    if (require) {
-        fs = require("fs");
-        pathModule = require("path");
-    }
-    else {
-        fs = pathModule = {};
-    }
 
     function deleteFile(path: string) {
         try {
@@ -1022,7 +1017,6 @@ export namespace Compiler {
                 }
                 else if (original.text !== doc.text) {
                     jsCode += `\r\n\r\n!!!! File ${Utils.removeTestPathPrefixes(doc.file)} differs from original emit in noCheck emit\r\n`;
-                    const Diff = require("diff");
                     const expected = original.text;
                     const actual = doc.text;
                     const patch = Diff.createTwoFilesPatch("Expected", "Actual", expected, actual, "The full check baseline", "with noCheck set");
@@ -1518,8 +1512,7 @@ export namespace Baseline {
                 IO.writeFile(actualFileName, encodedActual);
             }
             const errorMessage = getBaselineFileChangedErrorMessage(relativeFileName);
-            if (!!require && opts && opts.PrintDiff) {
-                const Diff = require("diff");
+            if (opts && opts.PrintDiff) {
                 const patch = Diff.createTwoFilesPatch("Expected", "Actual", expected, actual, "The current baseline", "The new version");
                 throw new Error(`${errorMessage}${ts.ForegroundColorEscapeSequences.Grey}\n\n${patch}`);
             }

src/harness/harnessUtils.ts

@@ -1,3 +1,4 @@
+import vm from "vm";
 import * as Harness from "./_namespaces/Harness.js";
 import * as ts from "./_namespaces/ts.js";
 
@@ -6,7 +7,6 @@ export function encodeString(s: string): string {
 }
 
 export function evalFile(fileContents: string, fileName: string, nodeContext?: any) {
-    const vm = require("vm");
     if (nodeContext) {
         vm.runInNewContext(fileContents, nodeContext, fileName);
     }

src/testRunner/parallel/host.ts

@@ -1,3 +1,11 @@
+import { fork } from "child_process";
+import { statSync } from "fs";
+import Mocha from "mocha";
+import ms from "ms";
+import os from "os";
+import path from "path";
+import readline from "readline";
+import tty from "tty";
 import {
     configOption,
     globalTimeout,
@@ -26,20 +34,12 @@ import * as ts from "../_namespaces/ts.js";
 import * as Utils from "../_namespaces/Utils.js";
 
 export function start(importTests: () => Promise<unknown>) {
-    const Mocha = require("mocha") as typeof import("mocha");
     const Base = Mocha.reporters.Base;
     const color = Base.color;
     const cursor = Base.cursor;
-    const ms = require("ms") as typeof import("ms");
-    const readline = require("readline") as typeof import("readline");
-    const os = require("os") as typeof import("os");
-    const tty = require("tty") as typeof import("tty");
     const isatty = tty.isatty(1) && tty.isatty(2);
-    const path = require("path") as typeof import("path");
-    const { fork } = require("child_process") as typeof import("child_process");
-    const { statSync } = require("fs") as typeof import("fs");
 
-    // NOTE: paths for module and types for FailedTestReporter _do not_ line up due to our use of --outFile for run.js
+    // NOTE: paths for module and types for FailedTestReporter _do not_ line up when bundled
     const FailedTestReporter = require(Utils.findUpFile("scripts/failed-tests.cjs")) as typeof import("../../../scripts/failed-tests.cjs");
 
     const perfdataFileNameFragment = ".parallelperf";

src/testRunner/parallel/worker.ts

@@ -1,3 +1,4 @@
+import Mocha from "mocha";
 import {
     createRunner,
     globalTimeout,
@@ -39,9 +40,6 @@ export function start(importTests: () => Promise<unknown>) {
     let exceptionsHooked = false;
     hookUncaughtExceptions();
 
-    // Capitalization is aligned with the global `Mocha` namespace for typespace/namespace references.
-    const Mocha = require("mocha") as typeof import("mocha");
-
     /**
      * Mixin helper.
      * @param base The base class constructor.

src/testRunner/unittests/skipJSDocParsing.ts

@@ -1,10 +1,9 @@
+import * as Diff from "diff";
 import * as Harness from "../_namespaces/Harness.js";
 import * as ts from "../_namespaces/ts.js";
 import * as Utils from "../_namespaces/Utils.js";
 
 describe("unittests:: skipJSDocParsing", () => {
-    const Diff = require("diff");
-
     const kinds = [
         ts.JSDocParsingMode.ParseAll,
         ts.JSDocParsingMode.ParseForTypeErrors,

src/tsserver/nodeServer.ts

@@ -1,3 +1,8 @@
+import childProcess from "child_process";
+import fs from "fs";
+import net from "net";
+import os from "os";
+import readline from "readline";
 import {
     CharacterCodes,
     combinePaths,
@@ -9,7 +14,6 @@ import {
     getDirectoryPath,
     getRootLength,
     LanguageServiceMode,
-    MapLike,
     noop,
     noopFileWatcher,
     normalizePath,
@@ -37,24 +41,6 @@ interface LogOptions {
     logToFile?: boolean;
 }
 
-interface NodeChildProcess {
-    send(message: any, sendHandle?: any): void;
-    on(message: "message" | "exit", f: (m: any) => void): void;
-    kill(): void;
-    pid: number;
-}
-
-interface ReadLineOptions {
-    input: NodeJS.ReadableStream;
-    output?: NodeJS.WritableStream;
-    terminal?: boolean;
-    historySize?: number;
-}
-
-interface NodeSocket {
-    write(data: string, encoding: string): boolean;
-}
-
 function parseLoggingEnvironmentString(logEnvStr: string | undefined): LogOptions {
     if (!logEnvStr) {
         return {};
@@ -123,41 +109,6 @@ function parseServerMode(): LanguageServiceMode | string | undefined {
 /** @internal */
 export function initializeNodeSystem(): StartInput {
     const sys = Debug.checkDefined(ts.sys) as ts.server.ServerHost;
-    const childProcess: {
-        execFileSync(file: string, args: string[], options: { stdio: "ignore"; env: MapLike<string>; }): string | Buffer;
-    } = require("child_process");
-
-    interface Stats {
-        isFile(): boolean;
-        isDirectory(): boolean;
-        isBlockDevice(): boolean;
-        isCharacterDevice(): boolean;
-        isSymbolicLink(): boolean;
-        isFIFO(): boolean;
-        isSocket(): boolean;
-        dev: number;
-        ino: number;
-        mode: number;
-        nlink: number;
-        uid: number;
-        gid: number;
-        rdev: number;
-        size: number;
-        blksize: number;
-        blocks: number;
-        atime: Date;
-        mtime: Date;
-        ctime: Date;
-        birthtime: Date;
-    }
-
-    const fs: {
-        openSync(path: string, options: string): number;
-        close(fd: number, callback: (err: NodeJS.ErrnoException) => void): void;
-        writeSync(fd: number, buffer: Buffer, offset: number, length: number, position?: number): number;
-        statSync(path: string): Stats;
-        stat(path: string, callback?: (err: NodeJS.ErrnoException, stats: Stats) => any): void;
-    } = require("fs");
 
     class Logger implements Logger {
         private seq = 0;
@@ -231,7 +182,7 @@ export function initializeNodeSystem(): StartInput {
             if (this.fd >= 0) {
                 const buf = Buffer.from(s);
                 // eslint-disable-next-line no-restricted-syntax
-                fs.writeSync(this.fd, buf, 0, buf.length, /*position*/ null!); // TODO: GH#18217
+                fs.writeSync(this.fd, buf, 0, buf.length, /*position*/ null);
             }
             if (this.traceToConsole) {
                 console.warn(s);
@@ -326,7 +277,7 @@ export function initializeNodeSystem(): StartInput {
 
     let cancellationToken: ts.server.ServerCancellationToken;
     try {
-        const factory = require("./cancellationToken");
+        const factory = require("./cancellationToken.js");
         cancellationToken = factory(sys.args);
     }
     catch (e) {
@@ -439,31 +390,14 @@ function parseEventPort(eventPortStr: string | undefined) {
     return eventPort !== undefined && !isNaN(eventPort) ? eventPort : undefined;
 }
 function startNodeSession(options: StartSessionOptions, logger: ts.server.Logger, cancellationToken: ts.server.ServerCancellationToken) {
-    const childProcess: {
-        fork(modulePath: string, args: string[], options?: { execArgv: string[]; env?: MapLike<string>; }): NodeChildProcess;
-    } = require("child_process");
-
-    const os: {
-        homedir?(): string;
-        tmpdir(): string;
-    } = require("os");
-
-    const net: {
-        connect(options: { port: number; }, onConnect?: () => void): NodeSocket;
-    } = require("net");
-
-    const readline: {
-        createInterface(options: ReadLineOptions): NodeJS.EventEmitter;
-    } = require("readline");
-
     const rl = readline.createInterface({
         input: process.stdin,
         output: process.stdout,
         terminal: false,
     });
 
     class NodeTypingsInstallerAdapter extends ts.server.TypingsInstallerAdapter {
-        protected override installer!: NodeChildProcess;
+        protected override installer!: childProcess.ChildProcess;
         // This number is essentially arbitrary.  Processing more than one typings request
         // at a time makes sense, but having too many in the pipe results in a hang
         // (see https://github.com/nodejs/node/issues/7657).
@@ -533,7 +467,7 @@ function startNodeSession(options: StartSessionOptions, logger: ts.server.Logger
 
             const typingsInstaller = combinePaths(getDirectoryPath(sys.getExecutingFilePath()), "typingsInstaller.js");
             this.installer = childProcess.fork(typingsInstaller, args, { execArgv });
-            this.installer.on("message", m => this.handleMessage(m));
+            this.installer.on("message", m => this.handleMessage(m as any));
 
             // We have to schedule this event to the next tick
             // cause this fn will be called during
@@ -550,7 +484,7 @@ function startNodeSession(options: StartSessionOptions, logger: ts.server.Logger
 
     class IOSession extends ts.server.Session {
         private eventPort: number | undefined;
-        private eventSocket: NodeSocket | undefined;
+        private eventSocket: net.Socket | undefined;
         private socketEventQueue: { body: any; eventName: string; }[] | undefined;
         /** No longer needed if syntax target is es6 or above. Any access to "this" before initialized will be a runtime error. */
         private constructed: boolean | undefined;

src/tsserver/server.ts

@@ -1,3 +1,4 @@
+import os from "os";
 import * as ts from "../typescript/typescript.js";
 import { StartInput } from "./common.js";
 import { initializeNodeSystem } from "./nodeServer.js";
@@ -53,4 +54,4 @@ function start({ args, logger, cancellationToken, serverMode, unknownServerMode,
 }
 
 ts.setStackTraceLimit();
-start(initializeNodeSystem(), require("os").platform());
+start(initializeNodeSystem(), os.platform());

src/typingsInstaller/nodeTypingsInstaller.ts

@@ -1,3 +1,4 @@
+import { execFileSync } from "child_process";
 import * as fs from "fs";
 import * as path from "path";
 
@@ -79,10 +80,8 @@ interface ExecSyncOptions {
     cwd: string;
     encoding: "utf-8";
 }
-type ExecSync = (command: string, options: ExecSyncOptions) => string;
 
 export class NodeTypingsInstaller extends ts.server.typingsInstaller.TypingsInstaller {
-    private readonly nodeExecSync: ExecSync;
     private readonly npmPath: string;
     readonly typesRegistry: Map<string, MapLike<string>>;
 
@@ -109,7 +108,6 @@ export class NodeTypingsInstaller extends ts.server.typingsInstaller.TypingsInst
             this.log.writeLine(`NPM location: ${this.npmPath} (explicit '${ts.server.Arguments.NpmLocation}' ${npmLocation === undefined ? "not " : ""} provided)`);
             this.log.writeLine(`validateDefaultNpmLocation: ${validateDefaultNpmLocation}`);
         }
-        ({ execSync: this.nodeExecSync } = require("child_process"));
 
         this.ensurePackageDirectoryExists(globalTypingsCacheLocation);
 
@@ -174,7 +172,7 @@ export class NodeTypingsInstaller extends ts.server.typingsInstaller.TypingsInst
             this.log.writeLine(`Exec: ${command}`);
         }
         try {
-            const stdout = this.nodeExecSync(command, { ...options, encoding: "utf-8" });
+            const stdout = execFileSync(command, { ...options, encoding: "utf-8" });
             if (this.log.isEnabled()) {
                 this.log.writeLine(`    Succeeded. stdout:${indent(sys.newLine, stdout)}`);
             }