no-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-non-null-assertion',
meta: {
type: 'problem',
docs: {
description: 'Disallows non-null assertions using the `!` postfix operator',
category: 'Stylistic Issues',
recommended: 'warn',
suggestion: true,
},
messages: {
noNonNull: 'Forbidden non-null assertion.',
suggestOptionalChain: 'Consider using the optional chain operator `?.` instead. This operator includes runtime checks, so it is safer than the compile-only non-null assertion operator.',
},
schema: [],
},
defaultOptions: [],
create(context) {
const sourceCode = context.getSourceCode();
return {
TSNonNullExpression(node) {
var _a, _b;
const suggest = [];
function convertTokenToOptional(replacement) {
return (fixer) => {
const operator = sourceCode.getTokenAfter(node.expression, util.isNonNullAssertionPunctuator);
if (operator) {
return fixer.replaceText(operator, replacement);
}
return null;
};
}
function removeToken() {
return (fixer) => {
const operator = sourceCode.getTokenAfter(node.expression, util.isNonNullAssertionPunctuator);
if (operator) {
return fixer.remove(operator);
}
return null;
};
}
if (((_a = node.parent) === null || _a === void 0 ? void 0 : _a.type) === experimental_utils_1.AST_NODE_TYPES.MemberExpression &&
node.parent.object === node) {
if (!node.parent.optional) {
if (node.parent.computed) {
// it is x![y]?.z
suggest.push({
messageId: 'suggestOptionalChain',
fix: convertTokenToOptional('?.'),
});
}
else {
// it is x!.y?.z
suggest.push({
messageId: 'suggestOptionalChain',
fix: convertTokenToOptional('?'),
});
}
}
else {
if (node.parent.computed) {
// it is x!?.[y].z
suggest.push({
messageId: 'suggestOptionalChain',
fix: removeToken(),
});
}
else {
// it is x!?.y.z
suggest.push({
messageId: 'suggestOptionalChain',
fix: removeToken(),
});
}
}
}
else if (((_b = node.parent) === null || _b === void 0 ? void 0 : _b.type) === experimental_utils_1.AST_NODE_TYPES.CallExpression &&
node.parent.callee === node) {
if (!node.parent.optional) {
// it is x.y?.z!()
suggest.push({
messageId: 'suggestOptionalChain',
fix: convertTokenToOptional('?.'),
});
}
else {
// it is x.y.z!?.()
suggest.push({
messageId: 'suggestOptionalChain',
fix: removeToken(),
});
}
}
context.report({
node,
messageId: 'noNonNull',
suggest,
});
},
};
},
});
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