Fantastic ASTs and where to find them
summary
A working Parseltongue→JavaScript transpiler is built end to end: lexer produces tokens, a parser builds an AST, the AST is mutated to ban or rewrite dangerous calls, and code generation plus source maps produce runnable JS and browser debugging. Specific tools shown are esprima, escodegen, esquery. The demo replaces unforgivable functions with rictusempra, emits three alerts, debugs back to Parseltongue source and frees Harry inside about 25 minutes.
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chapters (12)
- 0:00Start
- 3:15Weakly Typed
- 3:32Variable Declarations
- 4:07Function Expressions
- 4:30Call Expression
- 7:29Converting variables
- 7:55Converting loops
- 8:25Converting functions
- 11:36Abstract
- 14:19Tokens in JavaScript
- 16:54Function Declaration
- 22:28Detect bad stuff
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