Remove support for CodeQL CLI versions older than v2.19.4 (#4108)

Author: charisk

extensions/ql-vscode/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [UNRELEASED]
 
 - Add new command "CodeQL: Trim Overlay Base Cache" that returns a database to the state prior to overlay evaluation, leaving only base predicates and types that may later be referenced during overlay evaluation. [#4082](https://github.com/github/vscode-codeql/pull/4082)
+- Remove support for CodeQL CLI versions older than 2.19.4. [#4108](https://github.com/github/vscode-codeql/pull/4108)
 
 ## 1.17.4 - 10 July 2025
 

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

@@ -1902,7 +1902,7 @@ function shouldDebugCliServer() {
 export class CliVersionConstraint {
   // The oldest version of the CLI that we support. This is used to determine
   // whether to show a warning about the CLI being too old on startup.
-  public static OLDEST_SUPPORTED_CLI_VERSION = new SemVer("2.18.4");
+  public static OLDEST_SUPPORTED_CLI_VERSION = new SemVer("2.19.4");
 
   constructor(private readonly cli: CodeQLCliServer) {
     /**/

extensions/ql-vscode/supported_cli_versions.json

@@ -3,6 +3,5 @@
   "v2.21.4",
   "v2.20.7",
   "v2.19.4",
-  "v2.18.4",
   "nightly"
 ]

extensions/ql-vscode/test/vscode-tests/cli-integration/debugger/debugger.test.ts

@@ -157,12 +157,6 @@ describeWithCodeQL()("Debugger", () => {
 
   it("should run a quick evaluation with a bigint-valued result column", async () => {
     await withDebugController(appCommands, async (controller) => {
-      const semver = await cli.getVersion();
-      if (semver.compare("2.18.4") < 0) {
-        // Skip this test if the CLI version is too old to support BigInt
-        return;
-      }
-
       await selectForQuickEval(quickEvalBigIntQueryPath, 4, 23, 4, 37);
 
       // Don't specify a query path, so we'll default to the active document ("QuickEvalBigIntQuery.ql")