90 lines
4.5 KiB
JavaScript
90 lines
4.5 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2019 Palantir Technologies, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Rule = void 0;
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var tslib_1 = require("tslib");
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var tsutils_1 = require("tsutils");
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var ts = require("typescript");
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var Lint = require("../index");
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var Rule = /** @class */ (function (_super) {
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tslib_1.__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.applyWithProgram = function (sourceFile, program) {
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return this.applyWithFunction(sourceFile, walk, undefined, program.getTypeChecker());
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};
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "no-null-undefined-union",
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description: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n Disallows explicitly declared or implicitly returned union types with both `null` and\n `undefined` as members.\n "], ["\n Disallows explicitly declared or implicitly returned union types with both \\`null\\` and\n \\`undefined\\` as members.\n "]))),
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rationale: Lint.Utils.dedent(templateObject_2 || (templateObject_2 = tslib_1.__makeTemplateObject(["\n A union type that includes both `null` and `undefined` is either redundant or fragile.\n Enforcing the choice between the two allows the `triple-equals` rule to exist without\n exceptions, and is essentially a more flexible version of the `no-null-keyword` rule.\n Optional parameters are not considered to have the type `undefined`.\n "], ["\n A union type that includes both \\`null\\` and \\`undefined\\` is either redundant or fragile.\n Enforcing the choice between the two allows the \\`triple-equals\\` rule to exist without\n exceptions, and is essentially a more flexible version of the \\`no-null-keyword\\` rule.\n Optional parameters are not considered to have the type \\`undefined\\`.\n "]))),
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "functionality",
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typescriptOnly: true,
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requiresTypeInfo: true,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "Union type cannot include both 'null' and 'undefined'.";
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return Rule;
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}(Lint.Rules.TypedRule));
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exports.Rule = Rule;
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function walk(ctx, tc) {
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return ts.forEachChild(ctx.sourceFile, function cb(node) {
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var type = getType(node, tc);
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if (type !== undefined && isNullUndefinedUnion(type)) {
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ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
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}
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return ts.forEachChild(node, cb);
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});
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}
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function getType(node, tc) {
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if (tsutils_1.isUnionTypeNode(node)) {
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return tc.getTypeAtLocation(node);
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}
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else if (tsutils_1.isSignatureDeclaration(node) && node.type === undefined) {
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// Explicit types should be handled by the first case.
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var signature = tc.getSignatureFromDeclaration(node);
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return signature === undefined ? undefined : signature.getReturnType();
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}
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else {
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return undefined;
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}
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}
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function isNullUndefinedUnion(type) {
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if (tsutils_1.isTypeReference(type) && type.typeArguments !== undefined) {
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return type.typeArguments.some(isNullUndefinedUnion);
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}
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if (tsutils_1.isUnionType(type)) {
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var hasNull = false;
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var hasUndefined = false;
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for (var _i = 0, _a = type.types; _i < _a.length; _i++) {
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var subType = _a[_i];
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hasNull = hasNull || subType.getFlags() === ts.TypeFlags.Null;
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hasUndefined = hasUndefined || subType.getFlags() === ts.TypeFlags.Undefined;
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if (hasNull && hasUndefined) {
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return true;
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}
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}
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}
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return false;
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}
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var templateObject_1, templateObject_2;
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