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/**
* @fileoverview enforce the location of arrow function bodies
* @author Sharmila Jesupaul
*/
"use strict";
const { isCommentToken, isNotOpeningParenToken } = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "enforce the location of arrow function bodies",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/implicit-arrow-linebreak"
},
fixable: "whitespace",
schema: [
{
enum: ["beside", "below"]
}
],
messages: {
expected: "Expected a linebreak before this expression.",
unexpected: "Expected no linebreak before this expression."
}
},
create(context) {
const sourceCode = context.getSourceCode();
const option = context.options[0] || "beside";
/**
* Validates the location of an arrow function body
* @param {ASTNode} node The arrow function body
* @returns {void}
*/
function validateExpression(node) {
if (node.body.type === "BlockStatement") {
return;
}
const arrowToken = sourceCode.getTokenBefore(node.body, isNotOpeningParenToken);
const firstTokenOfBody = sourceCode.getTokenAfter(arrowToken);
if (arrowToken.loc.end.line === firstTokenOfBody.loc.start.line && option === "below") {
context.report({
node: firstTokenOfBody,
messageId: "expected",
fix: fixer => fixer.insertTextBefore(firstTokenOfBody, "\n")
});
} else if (arrowToken.loc.end.line !== firstTokenOfBody.loc.start.line && option === "beside") {
context.report({
node: firstTokenOfBody,
messageId: "unexpected",
fix(fixer) {
if (sourceCode.getFirstTokenBetween(arrowToken, firstTokenOfBody, { includeComments: true, filter: isCommentToken })) {
return null;
}
return fixer.replaceTextRange([arrowToken.range[1], firstTokenOfBody.range[0]], " ");
}
});
}
}
//----------------------------------------------------------------------
// Public
//----------------------------------------------------------------------
return {
ArrowFunctionExpression: node => validateExpression(node)
};
}
};