--- /dev/null
+"use strict";
+/**
+ * @license
+ * Copyright 2014 Palantir Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+var tslib_1 = require("tslib");
+var semver = require("semver");
+var tsutils_1 = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var noUseBeforeDeclare_examples_1 = require("./code-examples/noUseBeforeDeclare.examples");
+var Rule = /** @class */ (function (_super) {
+ tslib_1.__extends(Rule, _super);
+ function Rule() {
+ return _super !== null && _super.apply(this, arguments) || this;
+ }
+ /* tslint:enable:object-literal-sort-keys */
+ Rule.FAILURE_STRING = function (name) {
+ return "variable '" + name + "' used before declaration";
+ };
+ Rule.prototype.applyWithProgram = function (sourceFile, program) {
+ return this.applyWithFunction(sourceFile, walk, undefined, program.getTypeChecker());
+ };
+ /* tslint:disable:object-literal-sort-keys */
+ Rule.metadata = {
+ ruleName: "no-use-before-declare",
+ description: "Disallows usage of variables before their declaration.",
+ descriptionDetails: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n This rule is primarily useful when using the `var` keyword since the compiler will\n automatically detect if a block-scoped `let` and `const` variable is used before\n declaration. Since most modern TypeScript doesn't use `var`, this rule is generally\n discouraged and is kept around for legacy purposes. It is slow to compute, is not\n enabled in the built-in configuration presets, and should not be used to inform TSLint\n design decisions.\n "], ["\n This rule is primarily useful when using the \\`var\\` keyword since the compiler will\n automatically detect if a block-scoped \\`let\\` and \\`const\\` variable is used before\n declaration. Since most modern TypeScript doesn't use \\`var\\`, this rule is generally\n discouraged and is kept around for legacy purposes. It is slow to compute, is not\n enabled in the built-in configuration presets, and should not be used to inform TSLint\n design decisions.\n "]))),
+ optionsDescription: "Not configurable.",
+ options: null,
+ optionExamples: [true],
+ type: "functionality",
+ typescriptOnly: false,
+ requiresTypeInfo: true,
+ codeExamples: noUseBeforeDeclare_examples_1.codeExamples,
+ deprecationMessage: semver.gte(ts.version, "2.9.0-dev.0")
+ ? "Since TypeScript 2.9. Please use the built-in compiler checks instead."
+ : undefined,
+ };
+ return Rule;
+}(Lint.Rules.TypedRule));
+exports.Rule = Rule;
+function walk(ctx, checker) {
+ return ts.forEachChild(ctx.sourceFile, function recur(node) {
+ switch (node.kind) {
+ case ts.SyntaxKind.TypeReference:
+ // Ignore types.
+ return;
+ case ts.SyntaxKind.PropertyAccessExpression:
+ // Ignore `y` in `x.y`, but recurse to `x`.
+ return recur(node.expression);
+ case ts.SyntaxKind.Identifier:
+ if (isPropNameInBinding(node)) {
+ return;
+ }
+ return checkIdentifier(node, checker.getSymbolAtLocation(node));
+ case ts.SyntaxKind.ExportSpecifier:
+ return checkIdentifier(node.name, checker.getExportSpecifierLocalTargetSymbol(node));
+ default:
+ return ts.forEachChild(node, recur);
+ }
+ });
+ function checkIdentifier(node, symbol) {
+ var declarations = symbol === undefined ? undefined : symbol.declarations;
+ if (declarations === undefined || declarations.length === 0) {
+ return;
+ }
+ var declaredBefore = declarations.some(function (decl) {
+ switch (decl.kind) {
+ case ts.SyntaxKind.FunctionDeclaration:
+ // Functions may be declared later.
+ return true;
+ default:
+ // Use `<=` in case this *is* the declaration.
+ // If it's a global declared in a different file, OK.
+ return decl.pos <= node.pos || decl.getSourceFile() !== ctx.sourceFile;
+ }
+ });
+ if (!declaredBefore) {
+ ctx.addFailureAtNode(node, Rule.FAILURE_STRING(node.text));
+ }
+ }
+ /**
+ * Destructured vars/args w/ rename are declared later in the source.
+ * var { x: y } = { x: 43 };
+ */
+ function isPropNameInBinding(node) {
+ return (node.parent !== undefined &&
+ tsutils_1.isBindingElement(node.parent) &&
+ node.parent.propertyName === node);
+ }
+}
+var templateObject_1;