devsite/node_modules/sucrase/dist/util/isAsyncOperation.js

39 lines
1.3 KiB
JavaScript
Raw Permalink Normal View History

2024-07-08 01:49:38 +00:00
"use strict";Object.defineProperty(exports, "__esModule", {value: true});var _keywords = require('../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.
*/
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 === _keywords.ContextualKeyword._await &&
token.identifierRole == null &&
token.scopeDepth === startToken.scopeDepth
) {
return true;
}
index += 1;
} while (depth > 0 && index < tokens.tokens.length);
return false;
} exports.default = isAsyncOperation;