Debug Bot

This is a simple Node.js program which can attach to a running Node.js program and evaluate expressions and give you the value.

Setup Instructions

Install yarn if not installed already.

npm install -g yarn

$ yarn install
$ yarn run build
$ yarn run test

This package uses Yarn 2. node_modules folder is no more. It comes with a few extra initial setup steps. VS Code is supported.

• Make sure you select the 'Workspace version' of TypeScript.
• A recommended extension ZipFS could be installed optionally for debugging dependencies. vscode-chrome-debug-core is already 'unplug'ged

Usage

• Logic for using Debug Adapter is in Attacher
• InlineExpressionEvaluator is used for the below example. An expression can be evaluated in a line in a file.
• ExpressionEvaluator has a callback which is used when a breakpoint is hit and an expression is evaluated.
• An instance of InlineExpressionEvaluator class can be created.
• attach method is used to attach to a running node.js process. The debugging port has to be passed as a parameter.
• getValue method is where a breakpoint is set and the value is fetched and returned. This needs the file path of the program where the breakpoint has to be set, line number, expression(variable name), and optionally column number.
• disconnect can be used to disconnect the debugger.

Examples

• tests/attacher.test.ts has the tests which is ran during npm run test
• tests/ExpressionEvaluator/inlineEvaluatorTest.ts has a simple program which can be used as an example, shown below.

In a terminal, run :

$ yarn node --inspect=43210 ./dist/tests/sampleProgram.js

Open another terminal, run :

$ yarn node ./dist/tests/ExpressionEvaluator/inlineEvaluatorTest.js

You can see that the value is printed on the console.