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[flow] Allow type casts in array patterns inside arrow parameters (#9069)

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This commit is contained in:
Nicolò Ribaudo
2018-11-24 12:23:49 +01:00
committed by GitHub
parent d2971a1959
commit 856edbf95f
15 changed files with 1801 additions and 6 deletions
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13
packages/babel-parser/src/parser/expression.js
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@@ -566,7 +566,7 @@ export default class ExpressionParser extends LValParser {
);
this.state.yieldOrAwaitInPossibleArrowParameters = oldYOAIPAP;
} else {
this.toReferencedList(node.arguments);
this.toReferencedListDeep(node.arguments);
// We keep the old value if it isn't null, for cases like
// (x = async(yield)) => {}
@@ -891,7 +891,14 @@ export default class ExpressionParser extends LValParser {
true,
refShorthandDefaultPos,
);
this.toReferencedList(node.elements);
if (!this.state.maybeInArrowParameters) {
// This could be an array pattern:
// ([a: string, b: string]) => {}
// In this case, we don't have to call toReferencedList. We will
// call it, if needed, when we are sure that it is a parenthesized
// expression by calling toReferencedListDeep.
this.toReferencedList(node.elements);
}
return this.finishNode(node, "ArrayExpression");
case tt.braceL:
@@ -1173,10 +1180,10 @@ export default class ExpressionParser extends LValParser {
}
if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start);
this.toReferencedListDeep(exprList, /* isParenthesizedExpr */ true);
if (exprList.length > 1) {
val = this.startNodeAt(innerStartPos, innerStartLoc);
val.expressions = exprList;
this.toReferencedList(val.expressions);
this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
} else {
val = exprList[0];