39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
|
"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;
|