Linting: Prefer optional chaining

eslint.config.mjs

@@ -131,6 +131,7 @@ export default [
       "no-sequences": "error",
       "no-shadow": "off",
       "@typescript-eslint/no-shadow": "error",
+      "@typescript-eslint/prefer-optional-chain": "error",
       "one-var": ["error", "never"],
     },
   },

src/config-utils.ts

@@ -943,7 +943,7 @@ async function getRemoteConfig(
   );
   const pieces = format.exec(configFile);
   // 5 = 4 groups + the whole expression
-  if (pieces === null || pieces.groups === undefined || pieces.length < 5) {
+  if (pieces?.groups === undefined || pieces.length < 5) {
     throw new ConfigurationError(
       errorMessages.getConfigFileRepoFormatInvalidMessage(configFile),
     );

src/config/db-config.ts

@@ -380,10 +380,7 @@ function combineQueries(
   const result: QuerySpec[] = [];
 
   // Query settings obtained from the repository properties have the highest precedence.
-  if (
-    augmentationProperties.repoPropertyQueries &&
-    augmentationProperties.repoPropertyQueries.input
-  ) {
+  if (augmentationProperties.repoPropertyQueries?.input) {
     logger.info(
       `Found query configuration in the repository properties (${RepositoryPropertyName.EXTRA_QUERIES}): ` +
         `${augmentationProperties.repoPropertyQueries.input.map((q) => q.uses).join(", ")}`,

src/setup-codeql.ts

@@ -168,7 +168,7 @@ export function tryGetTagNameFromUrl(
   // assumes less about the structure of the URL.
   const match = matches[matches.length - 1];
 
-  if (match === null || match.length !== 2) {
+  if (match?.length !== 2) {
     logger.debug(
       `Could not determine tag name for URL ${url}. Matched ${JSON.stringify(
         match,

src/start-proxy-action-post.ts

@@ -30,7 +30,7 @@ async function runWrapper() {
       logger,
     );
 
-    if ((config && config.debugMode) || core.isDebug()) {
+    if (config?.debugMode || core.isDebug()) {
       const logFilePath = core.getState("proxy-log-file");
       logger.info(
         "Debug mode is on. Uploading proxy log as Actions debugging artifact...",

src/tar.ts

@@ -35,14 +35,14 @@ async function getTarVersion(): Promise<TarVersion> {
   // Return whether this is GNU tar or BSD tar, and the version number
   if (stdout.includes("GNU tar")) {
     const match = stdout.match(/tar \(GNU tar\) ([0-9.]+)/);
-    if (!match || !match[1]) {
+    if (!match?.[1]) {
       throw new Error("Failed to parse output of tar --version.");
     }
 
     return { type: "gnu", version: match[1] };
   } else if (stdout.includes("bsdtar")) {
     const match = stdout.match(/bsdtar ([0-9.]+)/);
-    if (!match || !match[1]) {
+    if (!match?.[1]) {
       throw new Error("Failed to parse output of tar --version.");
     }
 

src/workflow.ts

@@ -371,7 +371,7 @@ function getInputOrThrow(
       input = input.replace(`\${{matrix.${key}}}`, value);
     }
   }
-  if (input !== undefined && input.includes("${{")) {
+  if (input?.includes("${{")) {
     throw new Error(
       `Could not get ${inputName} input to ${actionName} since it contained an unrecognized dynamic value.`,
     );