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"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 ts = require("typescript");
var Lint = require("../index");
var Rule = (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, function (ctx) { return walk(ctx, program.getTypeChecker()); });
};
return Rule;
}(Lint.Rules.TypedRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
ruleName: "no-use-before-declare",
description: "Disallows usage of variables before their declaration.",
descriptionDetails: (_a = ["\n This rule is primarily useful when using the `var` keyword -\n the compiler will detect if a `let` and `const` variable is used before it is declared."], _a.raw = ["\n This rule is primarily useful when using the \\`var\\` keyword -\n the compiler will detect if a \\`let\\` and \\`const\\` variable is used before it is declared."], Lint.Utils.dedent(_a)),
optionsDescription: "Not configurable.",
options: null,
optionExamples: [true],
type: "functionality",
typescriptOnly: false,
requiresTypeInfo: true,
};
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:
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));
}
}
}
var _a;
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