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82 lines
2.3 KiB
82 lines
2.3 KiB
/** |
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* @author Jamund Ferguson |
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* See LICENSE file in root directory for full license. |
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*/ |
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"use strict" |
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module.exports = { |
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meta: { |
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docs: { |
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description: |
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"ensure Node.js-style error-first callback pattern is followed", |
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category: "Possible Errors", |
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recommended: false, |
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url: |
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"https://github.com/mysticatea/eslint-plugin-node/blob/v11.1.0/docs/rules/no-callback-literal.md", |
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}, |
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type: "problem", |
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fixable: null, |
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schema: [], |
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}, |
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create(context) { |
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const callbackNames = ["callback", "cb"] |
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function isCallback(name) { |
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return callbackNames.indexOf(name) > -1 |
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} |
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return { |
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CallExpression(node) { |
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const errorArg = node.arguments[0] |
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const calleeName = node.callee.name |
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if ( |
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errorArg && |
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!couldBeError(errorArg) && |
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isCallback(calleeName) |
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) { |
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context.report({ |
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node, |
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message: |
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"Unexpected literal in error position of callback.", |
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}) |
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} |
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}, |
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} |
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}, |
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} |
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/** |
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* Determine if a node has a possiblity to be an Error object |
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* @param {ASTNode} node ASTNode to check |
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* @returns {boolean} True if there is a chance it contains an Error obj |
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*/ |
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function couldBeError(node) { |
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switch (node.type) { |
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case "Identifier": |
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case "CallExpression": |
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case "NewExpression": |
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case "MemberExpression": |
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case "TaggedTemplateExpression": |
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case "YieldExpression": |
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return true // possibly an error object. |
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case "AssignmentExpression": |
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return couldBeError(node.right) |
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case "SequenceExpression": { |
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const exprs = node.expressions |
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return exprs.length !== 0 && couldBeError(exprs[exprs.length - 1]) |
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} |
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case "LogicalExpression": |
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return couldBeError(node.left) || couldBeError(node.right) |
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case "ConditionalExpression": |
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return couldBeError(node.consequent) || couldBeError(node.alternate) |
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default: |
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return node.value === null |
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} |
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}
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