"use strict";
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/**
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* @license
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* Copyright 2013 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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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.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk);
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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: "interface-over-type-literal",
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description: "Prefer an interface declaration over a type literal (`type T = { ... }`)",
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rationale: "Interfaces are generally preferred over type literals because interfaces can be implemented, extended and merged.",
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "style",
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typescriptOnly: true,
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hasFix: true,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "Use an interface instead of a type literal.";
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return Rule;
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}(Lint.Rules.AbstractRule));
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exports.Rule = Rule;
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function walk(ctx) {
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return ts.forEachChild(ctx.sourceFile, function cb(node) {
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if (tsutils_1.isTypeAliasDeclaration(node) && tsutils_1.isTypeLiteralNode(node.type)) {
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var typeKeyword = tsutils_1.getChildOfKind(node, ts.SyntaxKind.TypeKeyword, ctx.sourceFile);
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var fix = [
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// "type" -> "interface"
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new Lint.Replacement(typeKeyword.end - 4, 4, "interface"),
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// remove "=" and trivia up to the open curly brace of the type literal
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Lint.Replacement.deleteFromTo(node.type.pos - 1, node.type.members.pos - 1),
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];
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// remove trailing semicolon if exists
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if (ctx.sourceFile.text[node.end - 1] === ";") {
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fix.push(Lint.Replacement.deleteText(node.end - 1, 1));
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}
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ctx.addFailureAtNode(node.name, Rule.FAILURE_STRING, fix);
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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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