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2 * @fileoverview Rule to check the spacing around the * in yield* expressions.
8 //------------------------------------------------------------------------------
10 //------------------------------------------------------------------------------
12 /** @type {import('../shared/types').Rule} */
18 description
: "Require or disallow spacing around the `*` in `yield*` expressions",
20 url
: "https://eslint.org/docs/rules/yield-star-spacing"
23 fixable
: "whitespace",
29 enum: ["before", "after", "both", "neither"]
34 before
: { type
: "boolean" },
35 after
: { type
: "boolean" }
37 additionalProperties
: false
43 missingBefore
: "Missing space before *.",
44 missingAfter
: "Missing space after *.",
45 unexpectedBefore
: "Unexpected space before *.",
46 unexpectedAfter
: "Unexpected space after *."
51 const sourceCode
= context
.getSourceCode();
53 const mode
= (function(option
) {
54 if (!option
|| typeof option
=== "string") {
56 before
: { before
: true, after
: false },
57 after
: { before
: false, after
: true },
58 both
: { before
: true, after
: true },
59 neither
: { before
: false, after
: false }
63 }(context
.options
[0]));
66 * Checks the spacing between two tokens before or after the star token.
67 * @param {string} side Either "before" or "after".
68 * @param {Token} leftToken `function` keyword token if side is "before", or
69 * star token if side is "after".
70 * @param {Token} rightToken Star token if side is "before", or identifier
71 * token if side is "after".
74 function checkSpacing(side
, leftToken
, rightToken
) {
75 if (sourceCode
.isSpaceBetweenTokens(leftToken
, rightToken
) !== mode
[side
]) {
76 const after
= leftToken
.value
=== "*";
77 const spaceRequired
= mode
[side
];
78 const node
= after
? leftToken
: rightToken
;
82 messageId
= side
=== "before" ? "missingBefore" : "missingAfter";
84 messageId
= side
=== "before" ? "unexpectedBefore" : "unexpectedAfter";
93 return fixer
.insertTextAfter(node
, " ");
95 return fixer
.insertTextBefore(node
, " ");
97 return fixer
.removeRange([leftToken
.range
[1], rightToken
.range
[0]]);
104 * Enforces the spacing around the star if node is a yield* expression.
105 * @param {ASTNode} node A yield expression node.
108 function checkExpression(node
) {
109 if (!node
.delegate
) {
113 const tokens
= sourceCode
.getFirstTokens(node
, 3);
114 const yieldToken
= tokens
[0];
115 const starToken
= tokens
[1];
116 const nextToken
= tokens
[2];
118 checkSpacing("before", yieldToken
, starToken
);
119 checkSpacing("after", starToken
, nextToken
);
123 YieldExpression
: checkExpression