Use semver package for version checks

Author: mediremi

server/src/incrementalCompilation.ts

@@ -6,6 +6,7 @@ import readline from "readline";
 import { performance } from "perf_hooks";
 import * as p from "vscode-languageserver-protocol";
 import * as cp from "node:child_process";
+import semver from "semver";
 import config, { send } from "./config";
 import * as c from "./constants";
 import * as chokidar from "chokidar";
@@ -573,8 +574,11 @@ async function figureOutBscArgs(entry: IncrementallyCompiledFileInfo) {
   });
 
   callArgs.push("-color", "never");
-  if (parseInt(project.rescriptVersion.split(".")[0] ?? "10") >= 11) {
-    // Only available in v11+
+  // Only available in v11+
+  if (
+    semver.valid(project.rescriptVersion) &&
+    semver.satisfies(project.rescriptVersion as string, ">=11", { includePrerelease: true })
+  ) {
     callArgs.push("-ignore-parse-errors");
   }
 

server/src/utils.ts

@@ -243,15 +243,8 @@ export let runAnalysisAfterSanityCheck = async (
    * with the extension itself.
    */
   let shouldUseBuiltinAnalysis =
-    rescriptVersion?.startsWith("9.") ||
-    rescriptVersion?.startsWith("10.") ||
-    rescriptVersion?.startsWith("11.") ||
-    [
-      "12.0.0-alpha.1",
-      "12.0.0-alpha.2",
-      "12.0.0-alpha.3",
-      "12.0.0-alpha.4",
-    ].includes(rescriptVersion ?? "");
+    semver.valid(rescriptVersion) &&
+    semver.lt(rescriptVersion as string, "12.0.0-alpha.5");
 
   if (!shouldUseBuiltinAnalysis && project != null) {
     binaryPath = project.editorAnalysisLocation;