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test(TypeScript): test ...infer type with parens #9056

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merged 1 commit into from Aug 26, 2020
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test(TypeScript): test ...infer type with parens #9056

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12 changes: 12 additions & 0 deletions tests/typescript/rest-type/__snapshots__/jsfmt.spec.js.snap
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Expand Up @@ -22,13 +22,25 @@ printWidth: 80
=====================================input======================================
type Tail<T extends any[]> = T extends [infer U, ...infer R] ? R : never;

// should remove parens from this, to avoid a type issue with TypeScript 4.0:
type Tail2<T extends any[]> = T extends [infer U, ...(infer R)] ? R : never;

// but not remove parens from this:
type Tail3<T extends any[]> = T extends [infer U, ...(infer R)[]] ? R : never;

type ReduceNextElement<
T extends readonly unknown[]
> = T extends readonly [infer V, ...infer R] ? [V, R] : never

=====================================output=====================================
type Tail<T extends any[]> = T extends [infer U, ...infer R] ? R : never;

// should remove parens from this, to avoid a type issue with TypeScript 4.0:
type Tail2<T extends any[]> = T extends [infer U, ...infer R] ? R : never;

// but not remove parens from this:
type Tail3<T extends any[]> = T extends [infer U, ...(infer R)[]] ? R : never;

type ReduceNextElement<T extends readonly unknown[]> = T extends readonly [
infer V,
...infer R
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6 changes: 6 additions & 0 deletions tests/typescript/rest-type/infer-type.ts
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@@ -1,5 +1,11 @@
type Tail<T extends any[]> = T extends [infer U, ...infer R] ? R : never;

// should remove parens from this, to avoid a type issue with TypeScript 4.0:
type Tail2<T extends any[]> = T extends [infer U, ...(infer R)] ? R : never;

// but not remove parens from this:
type Tail3<T extends any[]> = T extends [infer U, ...(infer R)[]] ? R : never;

type ReduceNextElement<
T extends readonly unknown[]
> = T extends readonly [infer V, ...infer R] ? [V, R] : never