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Correctly disambiguate / after async fuctions (#10475)

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* Correctly disambiguate / after async fuctions
This commit is contained in:
Nicolò Ribaudo
2019-12-02 22:41:39 +01:00
committed by GitHub
parent 8f89167486
commit 5440ae1cae
5 changed files with 325 additions and 0 deletions
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14
packages/babel-parser/src/parser/expression.js
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@@ -19,6 +19,7 @@
// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser
import { types as tt, type TokenType } from "../tokenizer/types";
import { types as ct } from "../tokenizer/context";
import * as N from "../types";
import LValParser from "./lval";
import {
@@ -970,6 +971,19 @@ export default class ExpressionParser extends LValParser {
this.match(tt._function) &&
!this.canInsertSemicolon()
) {
const last = this.state.context.length - 1;
if (this.state.context[last] !== ct.functionStatement) {
// Since "async" is an identifier and normally identifiers
// can't be followed by expression, the tokenizer assumes
// that "function" starts a statement.
// Fixing it in the tokenizer would mean tracking not only the
// previous token ("async"), but also the one before to know
// its beforeExpr value.
// It's easier and more efficient to adjust the context here.
throw new Error("Internal error");
}
this.state.context[last] = ct.functionExpression;
this.next();
return this.parseFunction(node, undefined, true);
} else if (