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frontend/node_modules/sucrase/dist/esm/util/isAsyncOperation.js

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+import {ContextualKeyword} from "../parser/tokenizer/keywords";
+
+
+/**
+ * Determine whether this optional chain or nullish coalescing operation has any await statements in
+ * it. If so, we'll need to transpile to an async operation.
+ *
+ * We compute this by walking the length of the operation and returning true if we see an await
+ * keyword used as a real await (rather than an object key or property access). Nested optional
+ * chain/nullish operations need to be tracked but don't silence await, but a nested async function
+ * (or any other nested scope) will make the await not count.
+ */
+export default function isAsyncOperation(tokens) {
+  let index = tokens.currentIndex();
+  let depth = 0;
+  const startToken = tokens.currentToken();
+  do {
+    const token = tokens.tokens[index];
+    if (token.isOptionalChainStart) {
+      depth++;
+    }
+    if (token.isOptionalChainEnd) {
+      depth--;
+    }
+    depth += token.numNullishCoalesceStarts;
+    depth -= token.numNullishCoalesceEnds;
+
+    if (
+      token.contextualKeyword === ContextualKeyword._await &&
+      token.identifierRole == null &&
+      token.scopeDepth === startToken.scopeDepth
+    ) {
+      return true;
+    }
+    index += 1;
+  } while (depth > 0 && index < tokens.tokens.length);
+  return false;
+}