Use type of 'string | Buffer'

extensions/ql-vscode/src/codeql-cli/cli.ts

@@ -19,7 +19,6 @@ import type { CliConfig } from "../config";
 import type { DistributionProvider } from "./distribution";
 import { FindDistributionResultKind } from "./distribution";
 import {
-  asString,
   assertNever,
   getErrorMessage,
   getErrorStack,
@@ -1606,8 +1605,8 @@ export function spawnServer(
   command: string[],
   commandArgs: string[],
   logger: Logger,
-  stderrListener: (data: unknown) => void,
-  stdoutListener?: (data: unknown) => void,
+  stderrListener: (data: string | Buffer) => void,
+  stdoutListener?: (data: string | Buffer) => void,
   progressReporter?: ProgressReporter,
 ): ChildProcessWithoutNullStreams {
   // Enable verbose logging.
@@ -1627,7 +1626,7 @@ export function spawnServer(
     );
   }
 
-  let lastStdout: unknown = undefined;
+  let lastStdout: string | Buffer | undefined = undefined;
   child.stdout!.on("data", (data) => {
     lastStdout = data;
   });
@@ -1644,7 +1643,7 @@ export function spawnServer(
     // If the process exited abnormally, log the last stdout message,
     // It may be from the jvm.
     if (code !== 0 && lastStdout !== undefined) {
-      void logger.log(`Last stdout was "${asString(lastStdout)}"`);
+      void logger.log(`Last stdout was "${lastStdout.toString()}"`);
     }
   });
   child.stderr!.on("data", stderrListener);

extensions/ql-vscode/src/common/helpers-pure.ts

@@ -68,20 +68,6 @@ export function asError(e: unknown): Error {
   return e instanceof Error ? e : new Error(String(e));
 }
 
-/**
- * Converts a unknown value to a string, using `toString` if possible,
- * or returning the human-readable strings "null" or "undefined".
- */
-export function asString(x: unknown): string {
-  if (x === null) {
-    return "null";
-  } else if (x === undefined) {
-    return "undefined";
-  } else {
-    return x.toString();
-  }
-}
-
 /**
  * Get error message when the error may have come from a method from the `child_process` module.
  */

extensions/ql-vscode/src/language-support/language-client.ts

@@ -5,7 +5,6 @@ import { LanguageClient, NotificationType } from "vscode-languageclient/node";
 import { shouldDebugLanguageServer, spawnServer } from "../codeql-cli/cli";
 import type { QueryServerConfig } from "../config";
 import { languageServerLogger } from "../common/logging/vscode";
-import { asString } from "../common/helpers-pure";
 
 /**
  * Managing the language client and corresponding server process for CodeQL.
@@ -75,9 +74,9 @@ async function spawnLanguageServer(
         args,
         languageServerLogger,
         (data) =>
-          languageServerLogger.log(asString(data), { trailingNewline: false }),
+          languageServerLogger.log(data.toString(), { trailingNewline: false }),
         (data) =>
-          languageServerLogger.log(asString(data), { trailingNewline: false }),
+          languageServerLogger.log(data.toString(), { trailingNewline: false }),
         progressReporter,
       );
       return { writer: child.stdin!, reader: child.stdout! };

extensions/ql-vscode/src/query-server/query-server-client.ts

@@ -18,7 +18,6 @@ import type { ProgressCallback, ProgressTask } from "../common/vscode/progress";
 import { withProgress } from "../common/vscode/progress";
 import { ServerProcess } from "./server-process";
 import type { App } from "../common/app";
-import { asString } from "../common/helpers-pure";
 
 type ServerOpts = {
   logger: Logger;
@@ -215,7 +214,7 @@ export class QueryServerClient extends DisposableObject {
       args,
       this.logger,
       (data) =>
-        this.activeQueryLogger.log(asString(data), {
+        this.activeQueryLogger.log(data.toString(), {
           trailingNewline: false,
         }),
       undefined, // no listener for stdout