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fix: corrects handling of newline after async with paren-less arrow function (#8830)

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If async is followed by a newline, then a paren-less arrow function should be parsed as two expressions
This commit is contained in:
Retsam 2018-10-09 17:25:31 -04:00 committed by Nicolò Ribaudo
parent 3951acbff5
commit d2c75c2d38
3 changed files with 144 additions and 1 deletions
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7
packages/babel-parser/src/parser/expression.js
View File

@ -794,7 +794,12 @@ export default class ExpressionParser extends LValParser {
) {
this.next();
return this.parseFunction(node, false, false, true);
} else if (canBeArrow && id.name === "async" && this.match(tt.name)) {
} else if (
canBeArrow &&
!this.canInsertSemicolon() &&
id.name === "async" &&
this.match(tt.name)
) {
const oldYield = this.state.yieldInPossibleArrowParameters;
this.state.yieldInPossibleArrowParameters = null;
const params = [this.parseIdentifier()];

2
packages/babel-parser/test/fixtures/es2017/async-functions/newline-arrow/input.js vendored Normal file
View File

@ -0,0 +1,2 @@
async
x => x

136
packages/babel-parser/test/fixtures/es2017/async-functions/newline-arrow/output.json vendored Normal file
View File

@ -0,0 +1,136 @@
{
"type": "File",
"start": 0,
"end": 12,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 2,
"column": 6
}
},
"program": {
"type": "Program",
"start": 0,
"end": 12,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 2,
"column": 6
}
},
"sourceType": "script",
"interpreter": null,
"body": [
{
"type": "ExpressionStatement",
"start": 0,
"end": 5,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 5
}
},
"expression": {
"type": "Identifier",
"start": 0,
"end": 5,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 5
},
"identifierName": "async"
},
"name": "async"
}
},
{
"type": "ExpressionStatement",
"start": 6,
"end": 12,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 6
}
},
"expression": {
"type": "ArrowFunctionExpression",
"start": 6,
"end": 12,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 6
}
},
"id": null,
"generator": false,
"async": false,
"params": [
{
"type": "Identifier",
"start": 6,
"end": 7,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 1
},
"identifierName": "x"
},
"name": "x"
}
],
"body": {
"type": "Identifier",
"start": 11,
"end": 12,
"loc": {
"start": {
"line": 2,
"column": 5
},
"end": {
"line": 2,
"column": 6
},
"identifierName": "x"
},
"name": "x"
}
}
}
],
"directives": []
}
}