Get familiar with AST

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• user starts by entering JS code
• placeholder code is available
• press button to change modes
• uneditable JS code appears
• code is color-coded
• when node is selected, AST is shown on right
• nodes can be collapsed

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This has already been done with ast-explorer. We can link to this directly, or pull in the application, limit the configuration options (like parser) and provide and more in-depth walk-through.