Defines a major mode `rjsx-mode' based on `js2-mode' for editing JSX files. `rjsx-mode' extends the parser in `js2-mode' to support the full JSX syntax. This means you get all of the `js2' features plus proper syntax checking and highlighting of JSX code blocks. Some features that this mode adds to js2: - Highlighting JSX tag names and attributes (using the rjsx-tag and rjsx-attr faces) - Highlight undeclared JSX components - Parsing the spread operator {...otherProps} - Parsing && and || in child expressions {cond && } - Parsing ternary expressions {toggle ? : } Additionally, since rjsx-mode extends the js2 AST, utilities using the parse tree gain access to the JSX structure.