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Fix generator missing parens around an arrow returning function type (#10519)

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This commit is contained in:
Brian Ng 2019-10-11 20:22:42 -05:00 committed by Huáng Jùnliàng
parent 99035ca96e
commit e28c8ac612
3 changed files with 14 additions and 3 deletions
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12
packages/babel-generator/src/node/parentheses.js
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@ -35,14 +35,22 @@ export function NullableTypeAnnotation(node: Object, parent: Object): boolean {
return t.isArrayTypeAnnotation(parent);
}
export function FunctionTypeAnnotation(node: Object, parent: Object): boolean {
export function FunctionTypeAnnotation(
node: Object,
parent: Object,
printStack: Array<Object>,
): boolean {
return (
// (() => A) | (() => B)
t.isUnionTypeAnnotation(parent) ||
// (() => A) & (() => B)
t.isIntersectionTypeAnnotation(parent) ||
// (() => A)[]
t.isArrayTypeAnnotation(parent)
t.isArrayTypeAnnotation(parent) ||
// <T>(A: T): (T => T[]) => B => [A, B]
(t.isTypeAnnotation(parent) &&
// Check grandparent
t.isArrowFunctionExpression(printStack[printStack.length - 3]))
);
}

1
packages/babel-generator/test/fixtures/flow/arrow-functions/input.js vendored
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@ -5,3 +5,4 @@ const bar4 = x => {};
const bar5 = (x): string => {};
const bar6 = (x: number) => {};
const bar7 = <T>(x) => {};
const bar8 = <T>(x: T): (T => T[]) => y => [x, y];

4
packages/babel-generator/test/fixtures/flow/arrow-functions/output.js vendored
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@ -10,4 +10,6 @@ const bar5 = (x): string => {};
const bar6 = (x: number) => {};
const bar7 = <T>(x) => {};
const bar7 = <T>(x) => {};
const bar8 = <T>(x: T): ((T) => T[]) => y => [x, y];