How to use generateTrackerVar method in istanbul

Best JavaScript code snippet using istanbul

instrumenter.js

Source:instrumenter.js

...32                if (!preconditions[cond]) { throw new Error(cond); }33            }34        }35    }36    function generateTrackerVar(filename, omitSuffix) {37        var hash, suffix;38        if (crypto !== null) {39            hash = crypto.createHash('md5');40            hash.update(filename);41            suffix = hash.digest('base64');42            //trim trailing equal signs, turn identifier unsafe chars to safe ones + => _ and / => $43            suffix = suffix.replace(new RegExp('=', 'g'), '')44                .replace(new RegExp('\\+', 'g'), '_')45                .replace(new RegExp('/', 'g'), '$');46        } else {47            window.__cov_seq = window.__cov_seq || 0;48            window.__cov_seq += 1;49            suffix = window.__cov_seq;50        }51        return '__cov_' + (omitSuffix ? '' : suffix);52    }53    function pushAll(ary, thing) {54        if (!isArray(thing)) {55            thing = [ thing ];56        }57        Array.prototype.push.apply(ary, thing);58    }59    SYNTAX = {60        ArrayExpression: [ 'elements' ],61        AssignmentExpression: ['left', 'right'],62        BinaryExpression: ['left', 'right' ],63        BlockStatement: [ 'body' ],64        BreakStatement: [ 'label' ],65        CallExpression: [ 'callee', 'arguments'],66        CatchClause: ['param', 'body'],67        ConditionalExpression: [ 'test', 'consequent', 'alternate' ],68        ContinueStatement: [ 'label' ],69        DebuggerStatement: [ ],70        DoWhileStatement: [ 'test', 'body' ],71        EmptyStatement: [],72        ExpressionStatement: [ 'expression'],73        ForInStatement: [ 'left', 'right', 'body' ],74        ForStatement: ['init', 'test', 'update', 'body' ],75        FunctionDeclaration: ['id', 'params', 'body'],76        FunctionExpression: ['id', 'params', 'defaults', 'body'],77        Identifier: [],78        IfStatement: ['test', 'consequent', 'alternate'],79        LabeledStatement: ['label', 'body'],80        Literal: [],81        LogicalExpression: [ 'left', 'right' ],82        MemberExpression: ['object', 'property'],83        NewExpression: ['callee', 'arguments'],84        ObjectExpression: [ 'properties' ],85        Program: [ 'body' ],86        Property: [ 'key', 'value'],87        ReturnStatement: ['argument'],88        SequenceExpression: ['expressions'],89        SwitchCase: [ 'test', 'consequent' ],90        SwitchStatement: ['discriminant', 'cases' ],91        ThisExpression: [],92        ThrowStatement: ['argument'],93        TryStatement: [ 'block', 'handlers', 'finalizer' ],94        UnaryExpression: ['argument'],95        UpdateExpression: [ 'argument' ],96        VariableDeclaration: [ 'declarations' ],97        VariableDeclarator: [ 'id', 'init' ],98        WhileStatement: [ 'test', 'body' ],99        WithStatement: [ 'object', 'body' ]100    };101    for (nodeType in SYNTAX) {102        if (SYNTAX.hasOwnProperty(nodeType)) {103            SYNTAX[nodeType] = { name: nodeType, children: SYNTAX[nodeType] };104        }105    }106    astgen = {107        variable: function (name) { return { type: SYNTAX.Identifier.name, name: name }; },108        stringLiteral: function (str) { return { type: SYNTAX.Literal.name, value: String(str) }; },109        numericLiteral: function (num) { return { type: SYNTAX.Literal.name, value: Number(num) }; },110        statement: function (contents) { return { type: SYNTAX.ExpressionStatement.name, expression: contents }; },111        dot: function (obj, field) { return { type: SYNTAX.MemberExpression.name, computed: false, object: obj, property: field }; },112        subscript: function (obj, sub) { return { type: SYNTAX.MemberExpression.name, computed: true, object: obj, property: sub }; },113        postIncrement: function (obj) { return { type: SYNTAX.UpdateExpression.name, operator: '++', prefix: false, argument: obj }; },114        sequence: function (one, two) { return { type: SYNTAX.SequenceExpression.name, expressions: [one, two] }; }115    };116    function Walker(walkMap, scope, debug) {117        this.walkMap = walkMap;118        this.scope = scope;119        this.debug = debug;120        if (this.debug) {121            this.level = 0;122            this.seq = true;123        }124    }125    function defaultWalker(node, walker) {126        var type = node.type,127            children = SYNTAX[type].children,128            // don't run generated nodes thru custom walks otherwise we will attempt to instrument the instrumentation code :)129            applyCustomWalker = !!node.loc || node.type === SYNTAX.Program.name,130            walkerFn = applyCustomWalker ? walker.walkMap[type] : null,131            i,132            j,133            walkFnIndex,134            childType,135            childNode,136            ret = node,137            childArray,138            childElement,139            pathElement,140            assignNode,141            isLast;142        if (node.walking) { throw new Error('Infinite regress: Custom walkers may NOT call walker.walk(node)'); }143        node.walking = true;144        if (isArray(walkerFn)) {145            for (walkFnIndex = 0; walkFnIndex < walkerFn.length; walkFnIndex += 1) {146                isLast = walkFnIndex === walkerFn.length - 1;147                ret = walker.walk(ret, walkerFn[walkFnIndex]) || ret;148                if (ret.type !== type && !isLast) {149                    throw new Error('Only the last walker is allowed to change the node type: [type was: ' + type + ' ]');150                }151            }152        } else {153            if (walkerFn) {154                ret = walker.walk(node, walkerFn) || ret;155            }156        }157        for (i = 0; i < children.length; i += 1) {158            childType = children[i];159            childNode = node[childType];160            if (childNode && !childNode.skipWalk) {161                pathElement = { node: node, property: childType };162                if (isArray(childNode)) {163                    childArray = [];164                    for (j = 0; j < childNode.length; j += 1) {165                        childElement = childNode[j];166                        pathElement.index = j;167                        if (childElement) {168                          assignNode = walker.walk(childElement, null, pathElement) || childElement;169                          if (isArray(assignNode.prepend)) {170                              pushAll(childArray, assignNode.prepend);171                              delete assignNode.prepend;172                          }173                        }174                        pushAll(childArray, assignNode);175                    }176                    node[childType] = childArray;177                } else {178                    assignNode = walker.walk(childNode, null, pathElement) || childNode;179                    if (isArray(assignNode.prepend)) {180                        throw new Error('Internal error: attempt to prepend statements in disallowed (non-array) context');181                        /* if this should be allowed, this is how to solve it182                        tmpNode = { type: 'BlockStatement', body: [] };183                        pushAll(tmpNode.body, assignNode.prepend);184                        pushAll(tmpNode.body, assignNode);185                        node[childType] = tmpNode;186                        delete assignNode.prepend;187                        */188                    } else {189                        node[childType] = assignNode;190                    }191                }192            }193        }194        delete node.walking;195        return ret;196    }197    Walker.prototype = {198        startWalk: function (node) {199            this.path = [];200            this.walk(node);201        },202        walk: function (node, walkFn, pathElement) {203            var ret, i, seq, prefix;204            walkFn = walkFn || defaultWalker;205            if (this.debug) {206                this.seq += 1;207                this.level += 1;208                seq = this.seq;209                prefix = '';210                for (i = 0; i < this.level; i += 1) { prefix += '    '; }211                console.log(prefix + 'Enter (' + seq + '):' + node.type);212            }213            if (pathElement) { this.path.push(pathElement); }214            ret = walkFn.call(this.scope, node, this);215            if (pathElement) { this.path.pop(); }216            if (this.debug) {217                this.level -= 1;218                console.log(prefix + 'Return (' + seq + '):' + node.type);219            }220            return ret;221        },222        startLineForNode: function (node) {223            return node && node.loc && node.loc.start ? node.loc.start.line : null;224        },225        ancestor: function (n) {226            return this.path.length > n - 1 ? this.path[this.path.length - n] : null;227        },228        parent: function () {229            return this.ancestor(1);230        },231        isLabeled: function () {232            var el = this.parent();233            return el && el.node.type === SYNTAX.LabeledStatement.name;234        }235    };236    /**237     * mechanism to instrument code for coverage. It uses the `esprima` and238     * `escodegen` libraries for JS parsing and code generation respectively.239     *240     * Works on `node` as well as the browser.241     *242     * Usage on nodejs243     * ---------------244     *245     *      var instrumenter = new require('istanbul').Instrumenter(),246     *          changed = instrumenter.instrumentSync('function meaningOfLife() { return 42; }', 'filename.js');247     *248     * Usage in a browser249     * ------------------250     *251     * Load `esprima.js`, `escodegen.js` and `instrumenter.js` (this file) using `script` tags or other means.252     *253     * Create an instrumenter object as:254     *255     *      var instrumenter = new Instrumenter(),256     *          changed = instrumenter.instrumentSync('function meaningOfLife() { return 42; }', 'filename.js');257     *258     * Aside from demonstration purposes, it is unclear why you would want to instrument code in a browser.259     *260     * @class Instrumenter261     * @constructor262     * @param {Object} options Optional. Configuration options.263     * @param {String} [options.coverageVariable] the global variable name to use for264     *      tracking coverage. Defaults to `__coverage__`265     * @param {Boolean} [options.embedSource] whether to embed the source code of every266     *      file as an array in the file coverage object for that file. Defaults to `false`267     * @param {Boolean} [options.noCompact] emit readable code when set. Defaults to `false`268     * @param {Boolean} [options.noAutoWrap] do not automatically wrap the source in269     *      an anonymous function before covering it. By default, code is wrapped in270     *      an anonymous function before it is parsed. This is done because271     *      some nodejs libraries have `return` statements outside of272     *      a function which is technically invalid Javascript and causes the parser to fail.273     *      This construct, however, works correctly in node since module loading274     *      is done in the context of an anonymous function.275     *276     * Note that the semantics of the code *returned* by the instrumenter does not change in any way.277     * The function wrapper is "unwrapped" before the instrumented code is generated.278     * @param {Object} [options.codeGenerationOptions] an object that is directly passed to the `escodegen`279     *      library as configuration for code generation. The `noCompact` setting is not honored when this280     *      option is specified281     * @param {Boolean} [options.debug] assist in debugging. Currently, the only effect of282     *      setting this option is a pretty-print of the coverage variable. Defaults to `false`283     * @param {Boolean} [options.walkDebug] assist in debugging of the AST walker used by this class.284     *285     */286    function Instrumenter(options) {287        this.opts = options || {288            debug: false,289            walkDebug: false,290            coverageVariable: '__coverage__',291            codeGenerationOptions: undefined,292            noAutoWrap: false,293            noCompact: false,294            embedSource: false295        };296        this.walker = new Walker({297            ExpressionStatement: this.coverStatement,298            BreakStatement: this.coverStatement,299            ContinueStatement: this.coverStatement,300            DebuggerStatement: this.coverStatement,301            ReturnStatement: this.coverStatement,302            ThrowStatement: this.coverStatement,303            TryStatement: this.coverStatement,304            VariableDeclaration: this.coverStatement,305            IfStatement: [ this.ifBlockConverter, this.ifBranchInjector, this.coverStatement ],306            ForStatement: [ this.skipInit, this.loopBlockConverter, this.coverStatement ],307            ForInStatement: [ this.skipLeft, this.loopBlockConverter, this.coverStatement ],308            WhileStatement: [ this.loopBlockConverter, this.coverStatement ],309            DoWhileStatement: [ this.loopBlockConverter, this.coverStatement ],310            SwitchStatement: [ this.switchBranchInjector, this.coverStatement ],311            WithStatement: this.coverStatement,312            FunctionDeclaration: [ this.coverFunction, this.coverStatement ],313            FunctionExpression: this.coverFunction,314            LabeledStatement: this.coverStatement,315            ConditionalExpression: this.conditionalBranchInjector,316            LogicalExpression: this.logicalExpressionBranchInjector317        }, this, this.opts.walkDebug);318        //unit testing purposes only319        if (this.opts.backdoor && this.opts.backdoor.omitTrackerSuffix) {320            this.omitTrackerSuffix = true;321        }322    }323    Instrumenter.prototype = {324        /**325         * synchronous instrumentation method. Throws when illegal code is passed to it326         * @method instrumentSync327         * @param {String} code the code to be instrumented as a String328         * @param {String} filename Optional. The name of the file from which329         *  the code was read. A temporary filename is generated when not specified.330         *  Not specifying a filename is only useful for unit tests and demonstrations331         *  of this library.332         */333        instrumentSync: function (code, filename) {334            var program;335            //protect from users accidentally passing in a Buffer object instead336            if (typeof code !== 'string') { throw new Error('Code must be string'); }337            if (code.charAt(0) === '#') { //shebang, 'comment' it out, won't affect syntax tree locations for things we care about338                code = '//' + code;339            }340            if (!this.opts.noAutoWrap) {341                code = LEADER_WRAP + code + TRAILER_WRAP;342            }343            program = ESP.parse(code, { loc: true });344            if (!this.opts.noAutoWrap) {345                program = { type: SYNTAX.Program.name, body: program.body[0].expression.callee.body.body };346            }347            return this.instrumentASTSync(program, filename);348        },349        /**350         * synchronous instrumentation method that instruments an AST instead.351         * @method instrumentASTSync352         * @param {String} program the AST to be instrumented353         * @param {String} filename Optional. The name of the file from which354         *  the code was read. A temporary filename is generated when not specified.355         *  Not specifying a filename is only useful for unit tests and demonstrations356         *  of this library.357         */358        instrumentASTSync: function (program, filename) {359            filename = filename || String(new Date().getTime()) + '.js';360            this.coverState = {361                path: filename,362                s: {},363                b: {},364                f: {},365                fnMap: {},366                statementMap: {},367                branchMap: {}368            };369            this.currentState = {370                trackerVar: generateTrackerVar(filename, this.omitTrackerSuffix),371                func: 0,372                branch: 0,373                variable: 0,374                statement: 0375            };376            this.walker.startWalk(program);377            var codegenOptions = this.opts.codeGenerationOptions || { format: { compact: !this.opts.noCompact }};378            //console.log(JSON.stringify(program, undefined, 2));379            return this.getPreamble("") + '\n' + ESPGEN.generate(program, codegenOptions) + '\n';380        },381        /**382         * Callback based instrumentation. Note that this still executes synchronously in the same process tick383         * and calls back immediately. It only provides the options for callback style error handling as384         * opposed to a `try-catch` style and nothing more. Implemented as a wrapper over `instrumentSync`...

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3var code = 'var foo = "bar";';4instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {5  console.log(instrumentedCode);6});7var istanbul = require('istanbul');8var instrumenter = new istanbul.Instrumenter();9var code = 'var foo = "bar";';10instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {11  console.log(instrumentedCode);12});13var istanbul = require('istanbul');14var instrumenter = new istanbul.Instrumenter();15var code = 'var foo = "bar";';16instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {17  console.log(instrumentedCode);18});19var istanbul = require('istanbul');20var instrumenter = new istanbul.Instrumenter();21var code = 'var foo = "bar";';22instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {23  console.log(instrumentedCode);24});25var istanbul = require('istanbul');26var instrumenter = new istanbul.Instrumenter();27var code = 'var foo = "bar";';28instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {29  console.log(instrumentedCode);30});31var istanbul = require('istanbul');32var instrumenter = new istanbul.Instrumenter();33var code = 'var foo = "bar";';34instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {35  console.log(instrumentedCode);36});37var istanbul = require('istanbul');38var instrumenter = new istanbul.Instrumenter();39var code = 'var foo = "bar";';40instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {41  console.log(instrumentedCode);42});43var istanbul = require('istanbul');44var instrumenter = new istanbul.Instrumenter();45var code = 'var foo = "bar";';46instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {47  console.log(instrumentedCode);48});49var istanbul = require('

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3instrumenter.instrument('var a = 1;', 'test.js', function (err, code) {4    console.log(code);5});6var a = 1;7typeof __coverObject !== 'undefined' && __coverObject('test.js', {"path":"test.js","statementMap":{"0":{"start":{"line":1,"column":0},"end":{"line":1,"column":4}}},"fnMap":{},"branchMap":{},"s":{"0":1},"f":{},"b":{}});

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3var code = "var x = 10;";4instrumenter.instrument(code, 'test.js', function(err, instrumentedCode) {5    console.log(instrumentedCode);6});7var x = 10;

Using AI Code Generation

1var istanbul = require('istanbul');2var instrumenter = new istanbul.Instrumenter();3var code = 'var a = 1;';4var trackerVar = instrumenter.generateTrackerVar();5console.log(trackerVar);6__$$cov_20160202134702$$ = __$$cov_20160202134702$$ || [];7__$$cov_20160202134702$$.lineData = __$$cov_20160202134702$$.lineData || [];8__$$cov_20160202134702$$.lineData[0] = __$$cov_20160202134702$$.lineData[0] || [];9__$$cov_20160202134702$$.lineData[0][0] = __$$cov_20160202134702$$.lineData[0][0] || 0;10__$$cov_20160202134702$$.lineData[0][0]++;11__$$cov_20160202134702$$.lineData[0][1] = __$$cov_20160202134702$$.lineData[0][1] || 0;

Using AI Code Generation

1var istanbulMiddleware = require('istanbul-middleware');2var middleware = istanbulMiddleware.createHandler();3var trackerVar = middleware.generateTrackerVar();4var istanbulMiddleware = require('istanbul-middleware');5var middleware = istanbulMiddleware.createHandler();6var trackerVar = middleware.generateTrackerVar();7var trackerVar = middleware.generateTrackerVar();8var istanbulMiddleware = require('istanbul-middleware');9var middleware = istanbulMiddleware.createHandler();10var trackerVar = middleware.generateTrackerVar();11var istanbulMiddleware = require('istanbul-middleware');12var middleware = istanbulMiddleware.createHandler();13var trackerVar = middleware.generateTrackerVar();14var istanbulMiddleware = require('istanbul-middleware');15var middleware = istanbulMiddleware.createHandler();16var trackerVar = middleware.generateTrackerVar();17var istanbulMiddleware = require('istanbul-middleware');18var middleware = istanbulMiddleware.createHandler();19var trackerVar = middleware.generateTrackerVar();20var istanbulMiddleware = require('istanbul-middleware');21var middleware = istanbulMiddleware.createHandler();22var trackerVar = middleware.generateTrackerVar();23var istanbulMiddleware = require('istanbul-middleware');24var middleware = istanbulMiddleware.createHandler();25var trackerVar = middleware.generateTrackerVar();26var istanbulMiddleware = require('istanbul-middleware');27var middleware = istanbulMiddleware.createHandler();28var trackerVar = middleware.generateTrackerVar();29var istanbulMiddleware = require('istanbul-middleware');30var middleware = istanbulMiddleware.createHandler();31var trackerVar = middleware.generateTrackerVar();32var istanbulMiddleware = require('istanbul-middleware');

Using AI Code Generation

1var istanbulMiddleware = require('istanbul-middleware');2var generateTrackerVar = istanbulMiddleware.generateTrackerVar;3var trackerVar = generateTrackerVar();4console.log(trackerVar);5var istanbulMiddleware = require('istanbul-middleware');6var generateTrackerVar = istanbulMiddleware.generateTrackerVar;7var trackerVar = generateTrackerVar();8console.log(trackerVar);9I am using istanbul-middleware to generate coverage reports. I am able to generate the reports but I am not able to get the coverage details (coverage percentage, number of lines covered, number of lines not covered etc.) in my console. I am not sure if I am using the correct method to get the coverage details. I am using the following code to generate the coverage details:10I am using istanbul-middleware to generate coverage reports. I am able to generate the reports but I am not able to get the coverage details (coverage percentage, number of lines covered, number of lines not covered etc.) in my console. I am not sure if I am using the correct method to get the coverage details. I am using the following code to generate the coverage details:11I am using istanbul-middleware to generate coverage reports. I am able to generate the reports but I am not able to get the coverage details (coverage percentage, number of lines covered, number of lines not covered etc.) in my console. I am not sure if I am using the correct method to get the coverage details. I am using the following code to generate the coverage details:

Using AI Code Generation

1var istanbul = require('istanbul');2var tracker = istanbul.Tracker.create('default');3var varName = tracker.generateVarName('test.js');4console.log(varName);5var istanbul = require('istanbul');6var tracker = istanbul.Tracker.create('default');7var varName = tracker.generateVarName('test2.js');8console.log(varName);9var istanbul = require('istanbul');10var tracker = istanbul.Tracker.create('default');11var varName = tracker.generateVarName('test3.js');12console.log(varName);13var istanbul = require('istanbul');14var tracker = istanbul.Tracker.create('default');15var varName = tracker.generateVarName('test4.js');16console.log(varName);17var istanbul = require('istanbul');18var tracker = istanbul.Tracker.create('default');19var varName = tracker.generateVarName('test5.js');20console.log(varName);21var istanbul = require('istanbul');22var tracker = istanbul.Tracker.create('default');23var varName = tracker.generateVarName('test6.js');24console.log(varName);25var istanbul = require('istanbul');26var tracker = istanbul.Tracker.create('default');27var varName = tracker.generateVarName('test7.js');28console.log(varName);

Using AI Code Generation

1var istanbul = require('istanbul');2var generateTrackerVar = istanbul.api.generateTrackerVar;3var trackerVar = generateTrackerVar();4console.log(trackerVar);5var istanbul = require('istanbul');6var generateTrackerVar = istanbul.api.generateTrackerVar;7var trackerVar = generateTrackerVar();8console.log(trackerVar);9var istanbul = require('istanbul');10var generateTrackerVar = istanbul.api.generateTrackerVar;11var trackerVar = generateTrackerVar();12console.log(trackerVar);13var istanbul = require('istanbul');14var generateTrackerVar = istanbul.api.generateTrackerVar;15var trackerVar = generateTrackerVar();16console.log(trackerVar);17var istanbul = require('istanbul');18var generateTrackerVar = istanbul.api.generateTrackerVar;19var trackerVar = generateTrackerVar();20console.log(trackerVar);21var istanbul = require('istanbul');22var generateTrackerVar = istanbul.api.generateTrackerVar;23var trackerVar = generateTrackerVar();24console.log(trackerVar);25var istanbul = require('istanbul');26var generateTrackerVar = istanbul.api.generateTrackerVar;27var trackerVar = generateTrackerVar();28console.log(trackerVar);

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.