Notes for reading istanbuljs

codeReadingNotesIstanbuljs.md

Reading istanbuljs

instrumenter.js

It's a class file.

class Instrumenter

• Methods:
  • instrumentSync: It takes code, filename, and inputSourceMap. It creates babelOpts and generate sourcemap and AST with @babel/core#transformSync. The babelOpts is using their own plugin programVisitor. readInitialCoverage is used against the AST generated.
  • instrument: Callback style... not sure if I'm interested.
  • lastFileCoverage: returns fileCoverage property.
  • lastSourceMap: returns sourceMap property.

visitor.js

This is where programVisitor is from. It contains the VisitState class.

class VisitState

• Methods:
  • shouldIgnore:
  • hintFor:
  • maybeAssignSourceMapURL:
  • counterNeedsHoisting:
  • onEnter:
  • onExit:
  • setAttr:
  • getAttr:
  • increase:
  • insertCounter:
  • insertStatementCounter:
  • insertFunctionCounter:
  • getBranchIncrement:
  • findLeaves:

To be continued