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Fix to add parentheses for TSTypeQuery in some case #14042

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merged 13 commits into from Dec 30, 2022
Merged

Fix to add parentheses for TSTypeQuery in some case #14042

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4357463
add TSTypeQuery to needsParens
onishi-kohei Dec 21, 2022
8bd1d57
fix to lint prettier
onishi-kohei Dec 23, 2022
6075690
add test
onishi-kohei Dec 25, 2022
13d63c2
remove comment
onishi-kohei Dec 25, 2022
20e5a29
add changelog
onishi-kohei Dec 25, 2022
2fa910b
fix lint
onishi-kohei Dec 28, 2022
338124e
remove template comments at top in changelog
onishi-kohei Dec 28, 2022
15096f1
Fix changelog
fisker Dec 29, 2022
57d3a18
Add new line
fisker Dec 29, 2022
59a7a56
check objectType
onishi-kohei Dec 29, 2022
f3f7503
remove fallthrough comment
onishi-kohei Dec 29, 2022
7035317
check property name
onishi-kohei Dec 29, 2022
7ea60a6
Simplify changelog
fisker Dec 29, 2022
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19 changes: 19 additions & 0 deletions changelog_unreleased/typescript/14042.md
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@@ -0,0 +1,19 @@
#### Add parentheses for TSTypeQuery to improve readability (#14042 by @onishi-kohei)

<!-- prettier-ignore -->
```tsx
// Input
a as (typeof node.children)[number]
a as (typeof node.children)[]
a as ((typeof node.children)[number])[]

// Prettier stable
a as typeof node.children[number];
a as typeof node.children[];
a as typeof node.children[number][];

// Prettier main
a as (typeof node.children)[number];
a as (typeof node.children)[];
a as (typeof node.children)[number][];
```
9 changes: 8 additions & 1 deletion src/language-js/needs-parens.js
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Expand Up @@ -456,7 +456,14 @@ function needsParens(path, options) {
(parent.type === "TSTypeAnnotation" &&
path.getParentNode(1).type.startsWith("TSJSDoc"))
);

case "TSTypeQuery":
if (
parent.type === "TSIndexedAccessType" ||
parent.type === "TSArrayType"
) {
return true;
}
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@fisker fisker Dec 29, 2022 •
edited

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We need check the property name here, in this case name === "objectType".

Prettier pr-14042
Playground link

--parser typescript

Input:

a as (typeof node.children)[number]
a as (number)[typeof node.children]

Output:

a as (typeof node.children)[number];
a as number[(typeof node.children)];

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a as (typeof node.children)[]

this property name was elementType
May I add a case like the code below?

return (
        name === "objectType" || name === "elementType"   &&
        (parent.type === "TSIndexedAccessType" || parent.type === "TSArrayType")
      )

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@fisker fisker Dec 29, 2022 •
edited

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No, should be

return (
        (name === "objectType" && parent.type === "TSIndexedAccessType") ||
        (name === "elementType" && parent.type === "TSArrayType")
      )

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Fixed in this commit.　7035317

// fallthrough
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I don't think TSTypeQuery(TypeScript node type) can be a child of NullableTypeAnnotation(flow node type). This should not fallthrough.

case "ArrayTypeAnnotation":
return parent.type === "NullableTypeAnnotation";

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19 changes: 19 additions & 0 deletions tests/format/typescript/typeof/__snapshots__/jsfmt.spec.js.snap
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@@ -0,0 +1,19 @@
// Jest Snapshot v1, https://goo.gl/fbAQLP

exports[`typeof.ts format 1`] = `
====================================options=====================================
parsers: ["typescript"]
printWidth: 80
| printWidth
=====================================input======================================
a as (typeof node.children)[number]
a as (typeof node.children)[]
a as ((typeof node.children)[number])[]

=====================================output=====================================
a as (typeof node.children)[number];
a as (typeof node.children)[];
a as (typeof node.children)[number][];

================================================================================
`;
1 change: 1 addition & 0 deletions tests/format/typescript/typeof/jsfmt.spec.js
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@@ -0,0 +1 @@
run_spec(__dirname, ["typescript"]);
3 changes: 3 additions & 0 deletions tests/format/typescript/typeof/typeof.ts
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@@ -0,0 +1,3 @@
a as (typeof node.children)[number]
a as (typeof node.children)[]
a as ((typeof node.children)[number])[]