tslint-consistent-codestyle
Version:
Additional rules to enforce constistent code style with tslint
303 lines • 27.6 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var ts = require("typescript");
var Lint = require("tslint");
var tsutils_1 = require("tsutils");
var OPTION_FUNCTION_EXPRESSION_NAME = 'unused-function-expression-name';
var OPTION_CLASS_EXPRESSION_NAME = 'unused-class-expression-name';
var OPTION_CATCH_BINDING = 'unused-catch-binding';
var OPTION_IGNORE_PARAMETERS = 'ignore-parameters';
var OPTION_IGNORE_IMPORTS = 'ignore-imports';
var Rule = (function (_super) {
tslib_1.__extends(Rule, _super);
function Rule() {
return _super !== null && _super.apply(this, arguments) || this;
}
Rule.prototype.apply = function (sourceFile) {
return this.applyWithWalker(new UnusedWalker(sourceFile, this.ruleName, {
functionExpressionName: this.ruleArguments.indexOf(OPTION_FUNCTION_EXPRESSION_NAME) !== -1,
classExpressionName: this.ruleArguments.indexOf(OPTION_CLASS_EXPRESSION_NAME) !== -1,
ignoreParameters: this.ruleArguments.indexOf(OPTION_IGNORE_PARAMETERS) !== -1,
ignoreImports: this.ruleArguments.indexOf(OPTION_IGNORE_IMPORTS) !== -1,
catchBinding: this.ruleArguments.indexOf(OPTION_CATCH_BINDING) !== -1,
}));
};
return Rule;
}(Lint.Rules.AbstractRule));
exports.Rule = Rule;
var UnusedWalker = (function (_super) {
tslib_1.__extends(UnusedWalker, _super);
function UnusedWalker() {
return _super !== null && _super.apply(this, arguments) || this;
}
UnusedWalker.prototype.walk = function (sourceFile) {
var _this = this;
var usage = tsutils_1.collectVariableUsage(sourceFile);
usage.forEach(function (variable, identifier) {
if (isExcluded(variable, sourceFile, usage, _this.options))
return;
switch (identifier.parent.kind) {
case ts.SyntaxKind.FunctionExpression:
if (variable.uses.length === 0 && _this.options.functionExpressionName)
_this._failNamedExpression(identifier, "Function");
return;
case ts.SyntaxKind.ClassExpression:
if (variable.uses.length === 0 && _this.options.classExpressionName)
_this._failNamedExpression(identifier, "Class");
return;
}
if (variable.uses.length === 0) {
if (identifier.text === 'React' && _this.sourceFile.languageVariant === ts.LanguageVariant.JSX &&
isImportFromExternal(identifier) && containsJsx(_this.sourceFile))
return;
return _this._fail(identifier, 'unused');
}
var uses = filterWriteOnly(variable.uses, identifier);
if (uses.length === 0)
return _this._fail(identifier, 'only written and never read');
var filtered = uses.length !== variable.uses.length;
uses = filterUsesInDeclaration(uses, variable.declarations);
if (uses.length === 0)
return _this._fail(identifier, "only " + (filtered ? 'written or ' : '') + "used inside of its declaration");
});
};
UnusedWalker.prototype._fail = function (identifier, error) {
return this.addFailureAtNode(identifier, showKind(identifier) + " '" + identifier.text + "' is " + error + ".");
};
UnusedWalker.prototype._failNamedExpression = function (identifier, kind) {
this.addFailureAtNode(identifier, kind + " '" + identifier.text + "' is never used by its name. Convert it to an anonymous " + kind.toLocaleLowerCase() + " expression.", Lint.Replacement.deleteFromTo(identifier.pos, identifier.end));
};
return UnusedWalker;
}(Lint.AbstractWalker));
function containsJsx(node) {
switch (node.kind) {
case ts.SyntaxKind.JsxElement:
case ts.SyntaxKind.JsxSelfClosingElement:
case ts.SyntaxKind.JsxFragment:
return true;
default:
return ts.forEachChild(node, containsJsx);
}
}
function filterUsesInDeclaration(uses, declarations) {
var result = [];
outer: for (var _i = 0, uses_1 = uses; _i < uses_1.length; _i++) {
var use = uses_1[_i];
for (var _a = 0, declarations_1 = declarations; _a < declarations_1.length; _a++) {
var declaration = declarations_1[_a];
var parent = declaration.parent;
if (use.location.pos > parent.pos && use.location.pos < parent.end &&
(parent.kind !== ts.SyntaxKind.VariableDeclaration ||
initializerHasNoSideEffect(parent, use.location)))
continue outer;
}
result.push(use);
}
return result;
}
function initializerHasNoSideEffect(declaration, use) {
if (declaration.initializer === undefined)
return true;
return (function cb(node) {
if (node.pos > use.pos)
return 2;
if (node.end <= use.pos)
return;
switch (node.kind) {
case ts.SyntaxKind.CallExpression:
case ts.SyntaxKind.NewExpression:
case ts.SyntaxKind.TaggedTemplateExpression:
return 1;
case ts.SyntaxKind.ArrowFunction:
case ts.SyntaxKind.FunctionExpression:
case ts.SyntaxKind.ClassExpression:
return 2;
}
return ts.forEachChild(node, cb);
})(declaration.initializer) !== 1;
}
function filterWriteOnly(uses, identifier) {
var result = [];
for (var _i = 0, uses_2 = uses; _i < uses_2.length; _i++) {
var use = uses_2[_i];
if (use.domain & (2 | 8) ||
tsutils_1.isExpressionValueUsed(use.location) && !isUpdate(use.location, identifier))
result.push(use);
}
return result;
}
function isUpdate(use, identifier) {
while (true) {
var parent = use.parent;
switch (parent.kind) {
case ts.SyntaxKind.ParenthesizedExpression:
case ts.SyntaxKind.NonNullExpression:
case ts.SyntaxKind.TypeAssertionExpression:
case ts.SyntaxKind.AsExpression:
case ts.SyntaxKind.PrefixUnaryExpression:
case ts.SyntaxKind.PostfixUnaryExpression:
case ts.SyntaxKind.TypeOfExpression:
case ts.SyntaxKind.ConditionalExpression:
case ts.SyntaxKind.SpreadElement:
case ts.SyntaxKind.SpreadAssignment:
case ts.SyntaxKind.ObjectLiteralExpression:
case ts.SyntaxKind.ArrayLiteralExpression:
use = parent;
break;
case ts.SyntaxKind.PropertyAssignment:
case ts.SyntaxKind.ShorthandPropertyAssignment:
case ts.SyntaxKind.TemplateSpan:
use = parent.parent;
break;
case ts.SyntaxKind.BinaryExpression:
if (tsutils_1.isAssignmentKind(parent.operatorToken.kind))
return parent.right === use &&
parent.left.kind === ts.SyntaxKind.Identifier &&
parent.left.text === identifier.text;
use = parent;
break;
default:
return false;
}
}
}
function isExcluded(variable, sourceFile, usage, opts) {
if (variable.exported || variable.inGlobalScope)
return true;
for (var _i = 0, _a = variable.declarations; _i < _a.length; _i++) {
var declaration = _a[_i];
var parent = declaration.parent;
if (declaration.text.startsWith('_')) {
switch (parent.kind) {
case ts.SyntaxKind.Parameter:
return true;
case ts.SyntaxKind.VariableDeclaration:
if (parent.parent.parent.kind === ts.SyntaxKind.ForInStatement ||
parent.parent.parent.kind === ts.SyntaxKind.ForOfStatement)
return true;
break;
case ts.SyntaxKind.BindingElement:
if (parent.dotDotDotToken !== undefined)
break;
var pattern = parent.parent;
if (pattern.kind === ts.SyntaxKind.ObjectBindingPattern &&
pattern.elements[pattern.elements.length - 1].dotDotDotToken !== undefined)
return true;
}
}
if (tsutils_1.isParameterDeclaration(parent) &&
(opts.ignoreParameters || tsutils_1.isParameterProperty(parent) || !tsutils_1.isFunctionWithBody(parent.parent)) ||
!opts.catchBinding && parent.kind === ts.SyntaxKind.VariableDeclaration && parent.parent.kind === ts.SyntaxKind.CatchClause ||
parent.kind === ts.SyntaxKind.TypeParameter && parent.parent.kind === ts.SyntaxKind.MappedType ||
parent.kind === ts.SyntaxKind.TypeParameter && typeParameterMayBeRequired(parent, usage))
return true;
if (/\.tsx?$/.test(sourceFile.fileName) && !sourceFile.isDeclarationFile && opts.ignoreImports && isImportFromExternal(declaration))
return true;
}
return false;
}
function isImportFromExternal(node) {
switch (node.parent.kind) {
case ts.SyntaxKind.ImportEqualsDeclaration:
if (node.parent.moduleReference.kind === ts.SyntaxKind.ExternalModuleReference)
return true;
break;
case ts.SyntaxKind.NamespaceImport:
case ts.SyntaxKind.ImportSpecifier:
case ts.SyntaxKind.ImportClause:
return true;
default:
return false;
}
}
function typeParameterMayBeRequired(parameter, usage) {
var parent = parameter.parent;
switch (parent.kind) {
default:
return false;
case ts.SyntaxKind.InterfaceDeclaration:
case ts.SyntaxKind.ClassDeclaration:
if (typeParameterIsUsed(parameter, usage))
return true;
if (parent.name === undefined)
return false;
var variable = usage.get(parent.name);
if (!variable.exported)
return variable.inGlobalScope;
}
parent = parent.parent;
while (true) {
switch (parent.kind) {
case ts.SyntaxKind.ModuleBlock:
parent = parent.parent;
break;
case ts.SyntaxKind.ModuleDeclaration:
if (parent.name.kind !== ts.SyntaxKind.Identifier)
return ts.isExternalModule(parent.getSourceFile());
if (parent.flags & ts.NodeFlags.GlobalAugmentation)
return true;
var variable = usage.get(parent.name);
if (!variable.exported)
return variable.inGlobalScope;
parent = parent.parent;
break;
default:
return false;
}
}
}
function typeParameterIsUsed(parameter, usage) {
if (usage.get(parameter.name).uses.length !== 0)
return true;
var parent = parameter.parent;
if (parent.name === undefined)
return false;
var index = parent.typeParameters.indexOf(parameter);
for (var _i = 0, _a = usage.get(parent.name).declarations; _i < _a.length; _i++) {
var declaration = _a[_i];
var declarationParent = declaration.parent;
if (declarationParent === parent)
continue;
switch (declarationParent.kind) {
case ts.SyntaxKind.ClassDeclaration:
case ts.SyntaxKind.InterfaceDeclaration:
if (declarationParent.typeParameters !== undefined &&
declarationParent.typeParameters.length > index &&
usage.get(declarationParent.typeParameters[index].name).uses.length !== 0)
return true;
}
}
return false;
}
function showKind(node) {
switch (node.parent.kind) {
case ts.SyntaxKind.BindingElement:
case ts.SyntaxKind.VariableDeclaration:
return 'Variable';
case ts.SyntaxKind.Parameter:
return 'Parameter';
case ts.SyntaxKind.FunctionDeclaration:
return 'Function';
case ts.SyntaxKind.ClassDeclaration:
return 'Class';
case ts.SyntaxKind.InterfaceDeclaration:
return 'Interface';
case ts.SyntaxKind.ImportClause:
case ts.SyntaxKind.NamespaceImport:
case ts.SyntaxKind.ImportSpecifier:
case ts.SyntaxKind.ImportEqualsDeclaration:
return 'Import';
case ts.SyntaxKind.EnumDeclaration:
return 'Enum';
case ts.SyntaxKind.ModuleDeclaration:
return 'Namespace';
case ts.SyntaxKind.TypeAliasDeclaration:
return 'TypeAlias';
case ts.SyntaxKind.TypeParameter:
return 'TypeParameter';
default:
throw new Error("Unhandled kind " + node.parent.kind + ": " + ts.SyntaxKind[node.parent.kind]);
}
}
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