fix prettier-ignore in union types

changelog_unreleased/typescript/pr-7798.md

@@ -0,0 +1,32 @@
+#### Fix `prettier-ignore` in union types ([#7798](https://github.com/prettier/prettier/pull/7798) by [@thorn0](https://github.com/thorn0))
+
+<!-- prettier-ignore -->
+```ts
+// Input
+export type a =
+  // foo
+  | foo1&foo2
+  // prettier-ignore
+  | bar1&bar2
+  // baz
+  | baz1&baz2;
+
+// Prettier stable
+export type a =
+  // foo
+  | foo1&foo2
+    // prettier-ignore
+  // prettier-ignore
+  | (bar1 & bar2)
+  // baz
+  | (baz1 & baz2);
+
+// Prettier master
+export type a =
+  // foo
+  | (foo1 & foo2)
+  // prettier-ignore
+  | bar1&bar2
+  // baz
+  | (baz1 & baz2);
+```

cspell.json

@@ -381,6 +381,7 @@
         "unaries",
         "uncheck",
         "uncook",
+        "unignore",
         "uniqby",
         "unist",
         "unmount",

src/common/util.js

@@ -749,12 +749,19 @@ function hasIgnoreComment(path) {
 function hasNodeIgnoreComment(node) {
   return (
     node &&
-    node.comments &&
-    node.comments.length > 0 &&
-    node.comments.some((comment) => comment.value.trim() === "prettier-ignore")
+    ((node.comments &&
+      node.comments.length > 0 &&
+      node.comments.some(
+        (comment) => isNodeIgnoreComment(comment) && !comment.unignore
+      )) ||
+      node.prettierIgnore)
   );
 }
 
+function isNodeIgnoreComment(comment) {
+  return comment.value.trim() === "prettier-ignore";
+}
+
 function addCommentHelper(node, comment) {
   const comments = node.comments || (node.comments = []);
   comments.push(comment);
@@ -850,6 +857,7 @@ module.exports = {
   printNumber,
   hasIgnoreComment,
   hasNodeIgnoreComment,
+  isNodeIgnoreComment,
   makeString,
   addLeadingComment,
   addDanglingComment,

src/language-js/comments.js

@@ -722,9 +722,27 @@ function handleUnionTypeComments(
     (enclosingNode.type === "UnionTypeAnnotation" ||
       enclosingNode.type === "TSUnionType")
   ) {
-    addTrailingComment(precedingNode, comment);
-    return true;
+    if (privateUtil.isNodeIgnoreComment(comment)) {
+      followingNode.prettierIgnore = true;
+      comment.unignore = true;
+    }
+    if (precedingNode) {
+      addTrailingComment(precedingNode, comment);
+      return true;
+    }
+    return false;
   }
+
+  if (
+    followingNode &&
+    (followingNode.type === "UnionTypeAnnotation" ||
+      followingNode.type === "TSUnionType") &&
+    privateUtil.isNodeIgnoreComment(comment)
+  ) {
+    followingNode.types[0].prettierIgnore = true;
+    comment.unignore = true;
+  }
+
   return false;
 }
 

src/language-js/postprocess.js

@@ -60,13 +60,13 @@ function postprocess(ast, options) {
       }
       // remove redundant TypeScript nodes
       case "TSParenthesizedType": {
-        return node.typeAnnotation;
+        return { ...node.typeAnnotation, ...composeLoc(node) };
       }
       case "TSUnionType":
       case "TSIntersectionType":
         if (node.types.length === 1) {
           // override loc, so that comments are attached properly
-          return { ...node.types[0], loc: node.loc, range: node.range };
+          return { ...node.types[0], ...composeLoc(node) };
         }
         break;
       case "TSTypeParameter":

src/language-js/printer-estree.js

@@ -6089,7 +6089,9 @@ function willPrintOwnComments(path /*, options */) {
           ((parent.type === "ClassDeclaration" ||
             parent.type === "ClassExpression") &&
             parent.superClass === node)))) &&
-    !hasIgnoreComment(path)
+    (!hasIgnoreComment(path) ||
+      parent.type === "UnionTypeAnnotation" ||
+      parent.type === "TSUnionType")
   );
 }
 

src/main/core.js

@@ -34,7 +34,7 @@ function ensureAllCommentsPrinted(astComments) {
   }
 
   for (let i = 0; i < astComments.length; ++i) {
-    if (astComments[i].value.trim() === "prettier-ignore") {
+    if (privateUtil.isNodeIgnoreComment(astComments[i])) {
       // If there's a prettier-ignore, we're not printing that sub-tree so we
       // don't know if the comments was printed or not.
       return;

tests/typescript_union/__snapshots__/jsfmt.spec.js.snap

@@ -94,6 +94,134 @@ type T8 = number | ((arg: any) => void);
 ================================================================================
 `;
 
+exports[`prettier-ignore.ts 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+export type a =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // prettier-ignore
+  | qux1&qux2;
+
+export type a =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // prettier-ignore
+  | qux1&qux2
+  // baz
+  | baz1&baz2;
+
+export type a =
+  // prettier-ignore
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // qux
+  | qux1&qux2;
+
+=====================================output=====================================
+export type a =
+  // foo
+  | (foo1 & foo2)
+  // bar
+  | (bar1 & bar2)
+  // prettier-ignore
+  | qux1&qux2;
+
+export type a =
+  // foo
+  | (foo1 & foo2)
+  // bar
+  | (bar1 & bar2)
+  // prettier-ignore
+  | qux1&qux2
+  // baz
+  | (baz1 & baz2);
+
+export type a =
+  // prettier-ignore
+  | foo1&foo2
+  // bar
+  | (bar1 & bar2)
+  // qux
+  | (qux1 & qux2);
+
+================================================================================
+`;
+
+exports[`prettier-ignore-nested-unions.ts 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+export type a =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // prettier-ignore
+  | (
+    | aaaaaaaaaaaaa&1
+    // b
+    | bbbbbbbbbbbbb&2
+  )
+  // baz
+  | baz1&baz2;
+
+export type b =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  | (
+    // prettier-ignore
+    | aaaaaaaaaaaaa&1
+    // b
+    | bbbbbbbbbbbbb&2
+  )
+  // baz
+  | baz1&baz2;
+
+=====================================output=====================================
+export type a =
+  // foo
+  | (foo1 & foo2)
+  // bar
+  | (bar1 & bar2)
+  // prettier-ignore
+  | (
+    | aaaaaaaaaaaaa&1
+    // b
+    | bbbbbbbbbbbbb&2
+  )
+  // baz
+  | (baz1 & baz2);
+
+export type b =
+  // foo
+  | (foo1 & foo2)
+  // bar
+  | (bar1 & bar2)
+  | (
+      | // prettier-ignore
+      aaaaaaaaaaaaa&1
+      // b
+      | (bbbbbbbbbbbbb & 2)
+    )
+  // baz
+  | (baz1 & baz2);
+
+================================================================================
+`;
+
 exports[`union-parens.ts 1`] = `
 ====================================options=====================================
 parsers: ["typescript"]

tests/typescript_union/prettier-ignore-nested-unions.ts

@@ -0,0 +1,27 @@
+export type a =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // prettier-ignore
+  | (
+    | aaaaaaaaaaaaa&1
+    // b
+    | bbbbbbbbbbbbb&2
+  )
+  // baz
+  | baz1&baz2;
+
+export type b =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  | (
+    // prettier-ignore
+    | aaaaaaaaaaaaa&1
+    // b
+    | bbbbbbbbbbbbb&2
+  )
+  // baz
+  | baz1&baz2;

tests/typescript_union/prettier-ignore.ts

@@ -0,0 +1,25 @@
+export type a =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // prettier-ignore
+  | qux1&qux2;
+
+export type a =
+  // foo
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // prettier-ignore
+  | qux1&qux2
+  // baz
+  | baz1&baz2;
+
+export type a =
+  // prettier-ignore
+  | foo1&foo2
+  // bar
+  | bar1&bar2
+  // qux
+  | qux1&qux2;