Move the warning message outside of the parser function

Author: j-f1

parser.js

@@ -16,8 +16,21 @@ const SUPPORTED_TYPESCRIPT_VERSIONS = require("./package.json").devDependencies.
 const ACTIVE_TYPESCRIPT_VERSION = ts.version;
 const isRunningSupportedTypeScriptVersion = semver.satisfies(ACTIVE_TYPESCRIPT_VERSION, SUPPORTED_TYPESCRIPT_VERSIONS);
 
+if (!isRunningSupportedTypeScriptVersion) {
+    const border = "=============";
+    const versionWarning = [
+        border,
+        "WARNING: You are currently running a version of TypeScript which is not officially supported by typescript-eslint-parser.",
+        "You may find that it works just fine, or you may not.",
+        `SUPPORTED TYPESCRIPT VERSIONS: ${SUPPORTED_TYPESCRIPT_VERSIONS}`,
+        `YOUR TYPESCRIPT VERSION: ${ACTIVE_TYPESCRIPT_VERSION}`,
+        "Please only submit bug reports when using the officially supported version.",
+        border
+    ];
+    console.log(versionWarning.join("\n\n"));
+}
+
 let extra;
-let warnedAboutTSVersion = false;
 
 /**
  * Resets the extra config object
@@ -104,21 +117,6 @@ function parse(code, options) {
 
     }
 
-    if (!isRunningSupportedTypeScriptVersion && !warnedAboutTSVersion) {
-        const border = "=============";
-        const versionWarning = [
-            border,
-            "WARNING: You are currently running a version of TypeScript which is not officially supported by typescript-eslint-parser.",
-            "You may find that it works just fine, or you may not.",
-            `SUPPORTED TYPESCRIPT VERSIONS: ${SUPPORTED_TYPESCRIPT_VERSIONS}`,
-            `YOUR TYPESCRIPT VERSION: ${ACTIVE_TYPESCRIPT_VERSION}`,
-            "Please only submit bug reports when using the officially supported version.",
-            border
-        ];
-        extra.log(versionWarning.join("\n\n"));
-        warnedAboutTSVersion = true;
-    }
-
     // Even if jsx option is set in typescript compiler, filename still has to
     // contain .tsx file extension
     const FILENAME = (extra.ecmaFeatures.jsx) ? "eslint.tsx" : "eslint.ts";