callsite-record

Create fancy log entries for errors and function call sites.

For Error:

'use strict';

const createCallsiteRecord = require('callsite-record');

function myFunc() {
    throw new Error('Yo!');
}

try {
    myFunc();
}
catch(err) {
    console.log(createCallsiteRecord({ forError: err }).renderSync());
}

⬇

example

For function call up in the stack:

'use strict';

const createCallsiteRecord = require('callsite-record');

function func2 () {
    (function func1 () {
        console.log(createCallsiteRecord({ byFunctionName: 'func2' }).renderSync());
    })();
}

func2();

⬇

example

Additional goodies:

Use renderers for different output formats, e.g. to produce output in HTML.
Use stack filter to produce clean and beautiful stacks, e.g. removing Node lib internal calls.

Install

npm install callsite-record

API

createCallsiteRecord( { forError, isCallsiteFrame, processFrameFn }) → CallsiteRecord

You can generate a callsite for any stack frame, not only the topmost one. Use the isCallsiteFrame function to select a frame. This function is called for each frame starting from the top. Return true for the desired frame to generate the callsite.

Example:

const createCallsiteRecord = require('callsite-record');

try {
    throw new Error("We're doomed");
}
catch(err) {
    const record = createCallsiteRecord({ forError: err });
}

createCallsiteRecord({ byFunctionName, typeName, processFrameFn }) → CallsiteRecord

Creates CallsiteRecord for the function up in the call stack specified by byFunctionName. You can optionally specify a typeName if the function is a method. If the function is a constructor set byFunctionName to constructor.

Example:

const createCallsiteRecord = require('callsite-record');

(function func1() {
    (function func2() {
        (function func3() {
            const record = createCallsiteRecord({ byFunctionName: 'func2' });
        })();
    })();
})();

You can specify processFrameFn function, which will process every frame in callstack. It's usefull when you need to enable frame processing like source-maps-support.

Example:

const createCallsiteRecord = require('callsite-record');
const wrapCallSite         = require('source-map-support').wrapCallSite;

try {
    throw new Error("We're doomed");
}
catch(err) {
    const record = createCallsiteRecord({ forError: err, processFrameFn: wrapCallSite });
}

(function func1() {
    (function func2() {
        (function func3() {
            const record = createCallsiteRecord({ byFunctionName: 'func2', processFrameFn: wrapCallSite });
        })();
    })();
})();

CallsiteRecord

CallsiteRecord.render([renderOptions]) → Promise<String>

Renders call site record to the string.

Example:

record.render().then(str => console.log(str));

CallsiteRecord.renderSync([renderOptions]) → String

Sync version of the CallsiteRecord.render.

renderOptions.frameSize

Specifies the number of lines rendered above and below the call site in the code frame. Default: 5.

Example:

console.log(record.renderSync({ frameSize: 0 }));
// > 12 |    func1();
// ...

console.log(record.renderSync({ frameSize: 1 }));
//   11 |(function func2() {
// > 12 |    func1();
//   13 |})();
// ...

renderOptions.codeFrame

Specifies if code frame should be rendered. If disabled only stack will be rendered. Default: true.

renderOptions.stack

Specifies if stack trace should be rendered in addition to the code frame. Default: true.

renderOptions.stackFilter

Function that will be used to filter stack frames. Function accepts 2 arguments:

stackFrame - stack entry.
idx - index of the frame.
isV8StackFrame - if true then stackFrame is a V8 CallSite object. Otherwise it's a StackFrame object.

Default: null.

Example:

const sep = require('path').sep;

// Remove node core lib calls from the stack trace
record.renderSync({ stackFilter: frame => frame.getFileName().indexOf(sep) > -1 });

renderOptions.renderer

Specifies the output format of the rendering. Default: renderers.default. You can pass your own renderer object (example implementations) or use one of the built-in renderers:

renderers.default

Provides ANSI-colored output as shown above.

Usage:

const defaultRenderer = require('callsite-record').renderers.default;

record.renderSync({ renderer: defaultRenderer });

renderers.noColor

Same as default renderer but without colors.

Usage:

const noColorRenderer = require('callsite-record').renderers.noColor;

record.renderSync({ renderer: noColorRenderer });

renderers.html

Outputs HTML that can be later decorated with the CSS and embeded into the web page. Example output.

Usage:

const htmlRenderer = require('callsite-record').renderers.html;

record.renderSync({ renderer: html });

is-es2016-keyword - Determine if string is an ES2016 keyword.
highlight-es - Highlight ECMAScript syntax for the console or any other medium.

Author

Ivan Nikulin (ifaaan@gmail.com)

Current Tags

4.1.5 ... latest (2 years ago)

callsite-record

Install

API

createCallsiteRecord( { forError, isCallsiteFrame, processFrameFn }) → CallsiteRecord

createCallsiteRecord({ byFunctionName, typeName, processFrameFn }) → CallsiteRecord

CallsiteRecord

CallsiteRecord.render([renderOptions]) → Promise<String>

CallsiteRecord.renderSync([renderOptions]) → String

renderOptions.frameSize

renderOptions.codeFrame

renderOptions.stack

renderOptions.stackFilter

renderOptions.renderer

renderers.default

renderers.noColor

renderers.html

Related

Author

Current Tags

19 Versions