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codeql-action/node_modules/eslint/lib/rules/space-before-function-paren.js
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/** | |
* @fileoverview Rule to validate spacing before function paren. | |
* @author Mathias Schreck <https://github.com/lo1tuma> | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Requirements | |
//------------------------------------------------------------------------------ | |
const astUtils = require("./utils/ast-utils"); | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "layout", | |
docs: { | |
description: "Enforce consistent spacing before `function` definition opening parenthesis", | |
recommended: false, | |
url: "https://eslint.org/docs/latest/rules/space-before-function-paren" | |
}, | |
fixable: "whitespace", | |
schema: [ | |
{ | |
oneOf: [ | |
{ | |
enum: ["always", "never"] | |
}, | |
{ | |
type: "object", | |
properties: { | |
anonymous: { | |
enum: ["always", "never", "ignore"] | |
}, | |
named: { | |
enum: ["always", "never", "ignore"] | |
}, | |
asyncArrow: { | |
enum: ["always", "never", "ignore"] | |
} | |
}, | |
additionalProperties: false | |
} | |
] | |
} | |
], | |
messages: { | |
unexpectedSpace: "Unexpected space before function parentheses.", | |
missingSpace: "Missing space before function parentheses." | |
} | |
}, | |
create(context) { | |
const sourceCode = context.sourceCode; | |
const baseConfig = typeof context.options[0] === "string" ? context.options[0] : "always"; | |
const overrideConfig = typeof context.options[0] === "object" ? context.options[0] : {}; | |
/** | |
* Determines whether a function has a name. | |
* @param {ASTNode} node The function node. | |
* @returns {boolean} Whether the function has a name. | |
*/ | |
function isNamedFunction(node) { | |
if (node.id) { | |
return true; | |
} | |
const parent = node.parent; | |
return parent.type === "MethodDefinition" || | |
(parent.type === "Property" && | |
( | |
parent.kind === "get" || | |
parent.kind === "set" || | |
parent.method | |
) | |
); | |
} | |
/** | |
* Gets the config for a given function | |
* @param {ASTNode} node The function node | |
* @returns {string} "always", "never", or "ignore" | |
*/ | |
function getConfigForFunction(node) { | |
if (node.type === "ArrowFunctionExpression") { | |
// Always ignore non-async functions and arrow functions without parens, e.g. async foo => bar | |
if (node.async && astUtils.isOpeningParenToken(sourceCode.getFirstToken(node, { skip: 1 }))) { | |
return overrideConfig.asyncArrow || baseConfig; | |
} | |
} else if (isNamedFunction(node)) { | |
return overrideConfig.named || baseConfig; | |
// `generator-star-spacing` should warn anonymous generators. E.g. `function* () {}` | |
} else if (!node.generator) { | |
return overrideConfig.anonymous || baseConfig; | |
} | |
return "ignore"; | |
} | |
/** | |
* Checks the parens of a function node | |
* @param {ASTNode} node A function node | |
* @returns {void} | |
*/ | |
function checkFunction(node) { | |
const functionConfig = getConfigForFunction(node); | |
if (functionConfig === "ignore") { | |
return; | |
} | |
const rightToken = sourceCode.getFirstToken(node, astUtils.isOpeningParenToken); | |
const leftToken = sourceCode.getTokenBefore(rightToken); | |
const hasSpacing = sourceCode.isSpaceBetweenTokens(leftToken, rightToken); | |
if (hasSpacing && functionConfig === "never") { | |
context.report({ | |
node, | |
loc: { | |
start: leftToken.loc.end, | |
end: rightToken.loc.start | |
}, | |
messageId: "unexpectedSpace", | |
fix(fixer) { | |
const comments = sourceCode.getCommentsBefore(rightToken); | |
// Don't fix anything if there's a single line comment between the left and the right token | |
if (comments.some(comment => comment.type === "Line")) { | |
return null; | |
} | |
return fixer.replaceTextRange( | |
[leftToken.range[1], rightToken.range[0]], | |
comments.reduce((text, comment) => text + sourceCode.getText(comment), "") | |
); | |
} | |
}); | |
} else if (!hasSpacing && functionConfig === "always") { | |
context.report({ | |
node, | |
loc: rightToken.loc, | |
messageId: "missingSpace", | |
fix: fixer => fixer.insertTextAfter(leftToken, " ") | |
}); | |
} | |
} | |
return { | |
ArrowFunctionExpression: checkFunction, | |
FunctionDeclaration: checkFunction, | |
FunctionExpression: checkFunction | |
}; | |
} | |
}; |