98 lines
2.8 KiB
JavaScript
98 lines
2.8 KiB
JavaScript
/**
|
|
* @fileoverview Rule to enforce a particular function style
|
|
* @author Nicholas C. Zakas
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
/** @type {import('../shared/types').Rule} */
|
|
module.exports = {
|
|
meta: {
|
|
type: "suggestion",
|
|
|
|
docs: {
|
|
description: "enforce the consistent use of either `function` declarations or expressions",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/rules/func-style"
|
|
},
|
|
|
|
schema: [
|
|
{
|
|
enum: ["declaration", "expression"]
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
allowArrowFunctions: {
|
|
type: "boolean",
|
|
default: false
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
],
|
|
|
|
messages: {
|
|
expression: "Expected a function expression.",
|
|
declaration: "Expected a function declaration."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
|
|
const style = context.options[0],
|
|
allowArrowFunctions = context.options[1] && context.options[1].allowArrowFunctions,
|
|
enforceDeclarations = (style === "declaration"),
|
|
stack = [];
|
|
|
|
const nodesToCheck = {
|
|
FunctionDeclaration(node) {
|
|
stack.push(false);
|
|
|
|
if (!enforceDeclarations && node.parent.type !== "ExportDefaultDeclaration") {
|
|
context.report({ node, messageId: "expression" });
|
|
}
|
|
},
|
|
"FunctionDeclaration:exit"() {
|
|
stack.pop();
|
|
},
|
|
|
|
FunctionExpression(node) {
|
|
stack.push(false);
|
|
|
|
if (enforceDeclarations && node.parent.type === "VariableDeclarator") {
|
|
context.report({ node: node.parent, messageId: "declaration" });
|
|
}
|
|
},
|
|
"FunctionExpression:exit"() {
|
|
stack.pop();
|
|
},
|
|
|
|
ThisExpression() {
|
|
if (stack.length > 0) {
|
|
stack[stack.length - 1] = true;
|
|
}
|
|
}
|
|
};
|
|
|
|
if (!allowArrowFunctions) {
|
|
nodesToCheck.ArrowFunctionExpression = function() {
|
|
stack.push(false);
|
|
};
|
|
|
|
nodesToCheck["ArrowFunctionExpression:exit"] = function(node) {
|
|
const hasThisExpr = stack.pop();
|
|
|
|
if (enforceDeclarations && !hasThisExpr && node.parent.type === "VariableDeclarator") {
|
|
context.report({ node: node.parent, messageId: "declaration" });
|
|
}
|
|
};
|
|
}
|
|
|
|
return nodesToCheck;
|
|
|
|
}
|
|
};
|