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Better error for disallowed trailing commas/parameters after rest elements (#9046)

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* handle disordered rest parameter in function expressions

* remove spaces [lint]

* polish function parameters validation

* add test with arrow function and comma after rest parameter [babel-parser]
This commit is contained in:
Grigory Moroz
2018-11-21 07:49:36 +01:00
committed by Nicolò Ribaudo
parent 61c1c77a28
commit 445b14148e
13 changed files with 49 additions and 11 deletions
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12
packages/babel-parser/src/parser/expression.js
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@@ -1113,11 +1113,13 @@ export default class ExpressionParser extends LValParser {
),
);
if (this.match(tt.comma) && this.lookahead().type === tt.parenR) {
this.raise(
this.state.start,
"A trailing comma is not permitted after the rest element",
);
if (this.match(tt.comma)) {
const nextTokenType = this.lookahead().type;
const errorMessage =
nextTokenType === tt.parenR
? "A trailing comma is not permitted after the rest element"
: "Rest parameter must be last formal parameter";
this.raise(this.state.start, errorMessage);
}
break;