Check available languages

src/codeql.ts

@@ -77,6 +77,10 @@ export interface CodeQL {
    * Finalize a database using 'codeql database finalize'.
    */
   finalizeDatabase(databasePath: string, threadsFlag: string): Promise<void>;
+  /**
+   * Run 'codeql resolve languages'.
+   */
+  resolveLanguages(): Promise<ResolveLanguagesOutput>;
   /**
    * Run 'codeql resolve queries'.
    */
@@ -99,6 +103,10 @@ export interface CodeQL {
   ): Promise<string>;
 }
 
+export interface ResolveLanguagesOutput {
+  [language: string]: [string];
+}
+
 export interface ResolveQueriesOutput {
   byLanguage: {
     [language: string]: {
@@ -478,6 +486,7 @@ export function setCodeQL(partialCodeql: Partial<CodeQL>): CodeQL {
       "extractScannedLanguage"
     ),
     finalizeDatabase: resolveFunction(partialCodeql, "finalizeDatabase"),
+    resolveLanguages: resolveFunction(partialCodeql, "resolveLanguages"),
     resolveQueries: resolveFunction(partialCodeql, "resolveQueries"),
     databaseAnalyze: resolveFunction(partialCodeql, "databaseAnalyze"),
   };
@@ -654,6 +663,19 @@ function getCodeQLForCmd(cmd: string): CodeQL {
         errorMatchers
       );
     },
+    async resolveLanguages() {
+      const codeqlArgs = ["resolve", "languages", "--format=json"];
+      let output = "";
+      await new toolrunner.ToolRunner(cmd, codeqlArgs, {
+        listeners: {
+          stdout: (data: Buffer) => {
+            output += data.toString();
+          },
+        },
+      }).exec();
+
+      return JSON.parse(output);
+    },
     async resolveQueries(
       queries: string[],
       extraSearchPath: string | undefined