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/**
* @fileoverview Rule to warn when a function expression does not have a name.
* @author Kyle T. Nunery
*/
"use strict";
/**
* Checks whether or not a given variable is a function name.
* @param {escope.Variable} variable - A variable to check.
* @returns {boolean} `true` if the variable is a function name.
*/
function isFunctionName(variable) {
return variable && variable.defs[0].type === "FunctionName";
}
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require or disallow named `function` expressions",
category: "Stylistic Issues",
recommended: false
},
schema: [
{
enum: ["always", "never"]
}
]
},
create: function(context) {
const never = context.options[0] === "never";
/**
* Determines whether the current FunctionExpression node is a get, set, or
* shorthand method in an object literal or a class.
* @returns {boolean} True if the node is a get, set, or shorthand method.
*/
function isObjectOrClassMethod() {
const parent = context.getAncestors().pop();
return (parent.type === "MethodDefinition" || (
parent.type === "Property" && (
parent.method ||
parent.kind === "get" ||
parent.kind === "set"
)
));
}
return {
"FunctionExpression:exit": function(node) {
// Skip recursive functions.
const nameVar = context.getDeclaredVariables(node)[0];
if (isFunctionName(nameVar) && nameVar.references.length > 0) {
return;
}
const name = node.id && node.id.name;
if (never) {
if (name) {
context.report(node, "Unexpected function expression name.");
}
} else {
if (!name && !isObjectOrClassMethod()) {
context.report(node, "Missing function expression name.");
}
}
}
};
}
};
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