no-confusing-non-null-assertion.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: 'no-confusing-non-null-assertion',
meta: {
type: 'problem',
docs: {
description: 'Disallow non-null assertion in locations that may be confusing',
category: 'Stylistic Issues',
recommended: false,
},
fixable: 'code',
messages: {
confusingEqual: 'Confusing combinations of non-null assertion and equal test like "a! == b", which looks very similar to not equal "a !== b"',
confusingAssign: 'Confusing combinations of non-null assertion and equal test like "a! = b", which looks very similar to not equal "a != b"',
notNeedInEqualTest: 'Unnecessary non-null assertion (!) in equal test',
notNeedInAssign: 'Unnecessary non-null assertion (!) in assignment left hand',
wrapUpLeft: 'Wrap up left hand to avoid putting non-null assertion "!" and "=" together',
},
schema: [],
},
defaultOptions: [],
create(context) {
const sourceCode = context.getSourceCode();
return {
'BinaryExpression, AssignmentExpression'(node) {
function isLeftHandPrimaryExpression(node) {
return node.type === experimental_utils_1.AST_NODE_TYPES.TSNonNullExpression;
}
if (node.operator === '==' ||
node.operator === '===' ||
node.operator === '=') {
const isAssign = node.operator === '=';
const leftHandFinalToken = sourceCode.getLastToken(node.left);
const tokenAfterLeft = sourceCode.getTokenAfter(node.left);
if ((leftHandFinalToken === null || leftHandFinalToken === void 0 ? void 0 : leftHandFinalToken.type) === experimental_utils_1.AST_TOKEN_TYPES.Punctuator &&
(leftHandFinalToken === null || leftHandFinalToken === void 0 ? void 0 : leftHandFinalToken.value) === '!' &&
(tokenAfterLeft === null || tokenAfterLeft === void 0 ? void 0 : tokenAfterLeft.value) !== ')') {
if (isLeftHandPrimaryExpression(node.left)) {
context.report({
node,
messageId: isAssign ? 'confusingAssign' : 'confusingEqual',
suggest: [
{
messageId: isAssign
? 'notNeedInAssign'
: 'notNeedInEqualTest',
fix: (fixer) => [
fixer.remove(leftHandFinalToken),
],
},
],
});
}
else {
context.report({
node,
messageId: isAssign ? 'confusingAssign' : 'confusingEqual',
suggest: [
{
messageId: 'wrapUpLeft',
fix: (fixer) => [
fixer.insertTextBefore(node.left, '('),
fixer.insertTextAfter(node.left, ')'),
],
},
],
});
}
}
}
},
};
},
});
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