space-before-function-paren.js
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"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const experimental_utils_1 = require("@typescript-eslint/experimental-utils");
const util = __importStar(require("../util"));
exports.default = util.createRule({
name: 'space-before-function-paren',
meta: {
type: 'layout',
docs: {
description: 'Enforces consistent spacing before function parenthesis',
category: 'Stylistic Issues',
recommended: false,
extendsBaseRule: true,
},
fixable: 'whitespace',
schema: [
{
oneOf: [
{
enum: ['always', 'never'],
},
{
type: 'object',
properties: {
anonymous: {
enum: ['always', 'never', 'ignore'],
},
named: {
enum: ['always', 'never', 'ignore'],
},
asyncArrow: {
enum: ['always', 'never', 'ignore'],
},
},
additionalProperties: false,
},
],
},
],
messages: {
unexpected: 'Unexpected space before function parentheses.',
missing: 'Missing space before function parentheses.',
},
},
defaultOptions: ['always'],
create(context) {
const sourceCode = context.getSourceCode();
const baseConfig = typeof context.options[0] === 'string' ? context.options[0] : 'always';
const overrideConfig = typeof context.options[0] === 'object' ? context.options[0] : {};
/**
* Determines whether a function has a name.
* @param {ASTNode} node The function node.
* @returns {boolean} Whether the function has a name.
*/
function isNamedFunction(node) {
if (node.id != null) {
return true;
}
const parent = node.parent;
return (parent.type === experimental_utils_1.AST_NODE_TYPES.MethodDefinition ||
parent.type === experimental_utils_1.AST_NODE_TYPES.TSAbstractMethodDefinition ||
(parent.type === experimental_utils_1.AST_NODE_TYPES.Property &&
(parent.kind === 'get' || parent.kind === 'set' || parent.method)));
}
/**
* Gets the config for a given function
* @param {ASTNode} node The function node
* @returns {string} "always", "never", or "ignore"
*/
function getConfigForFunction(node) {
var _a, _b, _c;
if (node.type === experimental_utils_1.AST_NODE_TYPES.ArrowFunctionExpression) {
// Always ignore non-async functions and arrow functions without parens, e.g. async foo => bar
if (node.async &&
util.isOpeningParenToken(sourceCode.getFirstToken(node, { skip: 1 }))) {
return (_a = overrideConfig.asyncArrow) !== null && _a !== void 0 ? _a : baseConfig;
}
}
else if (isNamedFunction(node)) {
return (_b = overrideConfig.named) !== null && _b !== void 0 ? _b : baseConfig;
// `generator-star-spacing` should warn anonymous generators. E.g. `function* () {}`
}
else if (!node.generator) {
return (_c = overrideConfig.anonymous) !== null && _c !== void 0 ? _c : baseConfig;
}
return 'ignore';
}
/**
* Checks the parens of a function node
* @param {ASTNode} node A function node
* @returns {void}
*/
function checkFunction(node) {
const functionConfig = getConfigForFunction(node);
if (functionConfig === 'ignore') {
return;
}
let leftToken, rightToken;
if (node.typeParameters) {
leftToken = sourceCode.getLastToken(node.typeParameters);
rightToken = sourceCode.getTokenAfter(leftToken);
}
else {
rightToken = sourceCode.getFirstToken(node, util.isOpeningParenToken);
leftToken = sourceCode.getTokenBefore(rightToken);
}
const hasSpacing = sourceCode.isSpaceBetweenTokens(leftToken, rightToken);
if (hasSpacing && functionConfig === 'never') {
context.report({
node,
loc: {
start: leftToken.loc.end,
end: rightToken.loc.start,
},
messageId: 'unexpected',
fix: fixer => fixer.removeRange([leftToken.range[1], rightToken.range[0]]),
});
}
else if (!hasSpacing &&
functionConfig === 'always' &&
(!node.typeParameters || node.id)) {
context.report({
node,
loc: rightToken.loc,
messageId: 'missing',
fix: fixer => fixer.insertTextAfter(leftToken, ' '),
});
}
}
return {
ArrowFunctionExpression: checkFunction,
FunctionDeclaration: checkFunction,
FunctionExpression: checkFunction,
TSEmptyBodyFunctionExpression: checkFunction,
TSDeclareFunction: checkFunction,
};
},
});
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