/usr/share/javascript/prettify/lang-dart.js is in libjs-prettify 2013.03.04+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | PR.registerLangHandler(PR.createSimpleLexer([["pln",/^[\t\n\r \xA0]+/,null,"\t\n\r \u00a0"]],[["com",/^#!(?:.*)/],["kwd",/^\b(?:import|library|part of|part|as|show|hide)\b/i],["com",/^\/\/(?:.*)/],["com",/^\/\*[^*]*\*+(?:[^\/*][^*]*\*+)*\//],["kwd",/^\b(?:class|interface)\b/i],["kwd",/^\b(?:assert|break|case|catch|continue|default|do|else|finally|for|if|in|is|new|return|super|switch|this|throw|try|while)\b/i],["kwd",/^\b(?:abstract|const|extends|factory|final|get|implements|native|operator|set|static|typedef|var)\b/i],
["typ",/^\b(?:bool|double|Dynamic|int|num|Object|String|void)\b/i],["kwd",/^\b(?:false|null|true)\b/i],["str",/^r?[\']{3}[\s|\S]*?[^\\][\']{3}/],["str",/^r?[\"]{3}[\s|\S]*?[^\\][\"]{3}/],["str",/^r?\'(\'|(?:[^\n\r\f])*?[^\\]\')/],["str",/^r?\"(\"|(?:[^\n\r\f])*?[^\\]\")/],["pln",/^[a-z_$][a-z0-9_]*/i],["pun",/^[~!%^&*+=|?:<>/-]/],["lit",/^\b0x[0-9a-f]+/i],["lit",/^\b\d+(?:\.\d*)?(?:e[+-]?\d+)?/i],["lit",/^\b\.\d+(?:e[+-]?\d+)?/i],
["pun",/^[(){}\[\],.;]/]]),["dart"]);
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