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fix parser bug where arrow functions have a higher precedence than they should - fixes #2118

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This commit is contained in:
Sebastian McKenzie
2015-10-30 22:50:53 +00:00
parent 37159fbc7d
commit 7012116f4e
13 changed files with 119 additions and 8 deletions
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5
packages/babylon/src/plugins/flow.js
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@@ -653,6 +653,7 @@ export default function (instance) {
instance.extend("parseParenItem", function () {
return function (node, startLoc, startPos, forceArrow?) {
let canBeArrow = this.state.potentialArrowAt = startPos;
if (this.match(tt.colon)) {
let typeCastNode = this.startNodeAt(startLoc, startPos);
typeCastNode.expression = node;
@@ -662,7 +663,7 @@ export default function (instance) {
this.unexpected();
}
if (this.eat(tt.arrow)) {
if (canBeArrow && this.eat(tt.arrow)) {
// ((lol): number => {});
let func = this.parseArrowExpression(this.startNodeAt(startLoc, startPos), [node]);
func.returnType = typeCastNode.typeAnnotation;
@@ -952,7 +953,7 @@ export default function (instance) {
startPos = startPos || this.state.start;
startLoc = startLoc || this.state.startLoc;
if (this.lookahead().type === tt.parenR) {
if (canBeArrow && this.lookahead().type === tt.parenR) {
// let foo = (): number => {};
this.expect(tt.parenL);
this.expect(tt.parenR);