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/**
* @fileoverview Rule to flag when IIFE is not wrapped in parens
* @author Ilya Volodin
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require parentheses around immediate `function` invocations",
category: "Best Practices",
recommended: false
},
schema: [
{
enum: ["outside", "inside", "any"]
}
]
},
create: function(context) {
const style = context.options[0] || "outside";
const sourceCode = context.getSourceCode();
/**
* Check if the node is wrapped in ()
* @param {ASTNode} node node to evaluate
* @returns {boolean} True if it is wrapped
* @private
*/
function wrapped(node) {
const previousToken = sourceCode.getTokenBefore(node),
nextToken = sourceCode.getTokenAfter(node);
return previousToken && previousToken.value === "(" &&
nextToken && nextToken.value === ")";
}
return {
CallExpression: function(node) {
if (node.callee.type === "FunctionExpression") {
const callExpressionWrapped = wrapped(node),
functionExpressionWrapped = wrapped(node.callee);
if (!callExpressionWrapped && !functionExpressionWrapped) {
context.report(node, "Wrap an immediate function invocation in parentheses.");
} else if (style === "inside" && !functionExpressionWrapped) {
context.report(node, "Wrap only the function expression in parens.");
} else if (style === "outside" && !callExpressionWrapped) {
context.report(node, "Move the invocation into the parens that contain the function.");
}
}
}
};
}
};
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