"use strict";
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/**
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* @license
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* Copyright 2017 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.applyWithProgram = function (sourceFile, program) {
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var promiseTypes = new Set(["Promise"].concat(this.ruleArguments));
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return this.applyWithFunction(sourceFile, walk, promiseTypes, 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: "await-promise",
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description: "Warns for an awaited value that is not a Promise.",
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optionsDescription: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n A list of 'string' names of any additional classes that should also be treated as Promises.\n For example, if you are using a class called 'Future' that implements the Thenable interface,\n you might tell the rule to consider type references with the name 'Future' as valid Promise-like\n types. Note that this rule doesn't check for type assignability or compatibility; it just checks\n type reference names.\n "], ["\n A list of 'string' names of any additional classes that should also be treated as Promises.\n For example, if you are using a class called 'Future' that implements the Thenable interface,\n you might tell the rule to consider type references with the name 'Future' as valid Promise-like\n types. Note that this rule doesn't check for type assignability or compatibility; it just checks\n type reference names.\n "]))),
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options: {
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type: "list",
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listType: {
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type: "array",
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items: { type: "string" },
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},
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},
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optionExamples: [true, [true, "Thenable"]],
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rationale: Lint.Utils.dedent(templateObject_2 || (templateObject_2 = tslib_1.__makeTemplateObject(["\n While it is valid JavaScript to await a non-Promise-like value (it will resolve immediately),\n this pattern is often a programmer error and the resulting semantics can be unintuitive.\n\n Awaiting non-Promise-like values often is an indication of programmer error, such as\n forgetting to add parenthesis to call a function that returns a Promise.\n "], ["\n While it is valid JavaScript to await a non-Promise-like value (it will resolve immediately),\n this pattern is often a programmer error and the resulting semantics can be unintuitive.\n\n Awaiting non-Promise-like values often is an indication of programmer error, such as\n forgetting to add parenthesis to call a function that returns a Promise.\n "]))),
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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 = "Invalid 'await' of a non-Promise value.";
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Rule.FAILURE_FOR_AWAIT_OF = "Invalid 'for-await-of' of a non-AsyncIterable value.";
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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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var promiseTypes = ctx.options;
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return ts.forEachChild(ctx.sourceFile, cb);
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function cb(node) {
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if (tsutils_1.isAwaitExpression(node) &&
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!containsType(tc.getTypeAtLocation(node.expression), isPromiseType)) {
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ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
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}
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else if (tsutils_1.isForOfStatement(node) &&
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node.awaitModifier !== undefined &&
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!containsType(tc.getTypeAtLocation(node.expression), isAsyncIterable)) {
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ctx.addFailureAtNode(node.expression, Rule.FAILURE_FOR_AWAIT_OF);
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}
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return ts.forEachChild(node, cb);
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}
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function isPromiseType(name) {
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return promiseTypes.has(name);
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}
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}
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function containsType(type, predicate) {
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if (tsutils_1.isTypeFlagSet(type, ts.TypeFlags.Any)) {
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return true;
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}
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if (tsutils_1.isTypeReference(type)) {
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type = type.target;
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}
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if (type.symbol !== undefined && predicate(type.symbol.name)) {
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return true;
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}
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if (tsutils_1.isUnionOrIntersectionType(type)) {
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return type.types.some(function (t) { return containsType(t, predicate); });
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}
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var bases = type.getBaseTypes();
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return bases !== undefined && bases.some(function (t) { return containsType(t, predicate); });
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}
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function isAsyncIterable(name) {
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return name === "AsyncIterable" || name === "AsyncIterableIterator";
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}
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var templateObject_1, templateObject_2;
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