options.js
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var defaults = {
// If you want to use a different branch of esprima, or any other module
// that supports a .parse function, pass that module object to
// recast.parse as options.parser (legacy synonym: options.esprima).
parser: require("../parsers/esprima"),
// Number of spaces the pretty-printer should use per tab for
// indentation. If you do not pass this option explicitly, it will be
// (quite reliably!) inferred from the original code.
tabWidth: 4,
// If you really want the pretty-printer to use tabs instead of spaces,
// make this option true.
useTabs: false,
// The reprinting code leaves leading whitespace untouched unless it has
// to reindent a line, or you pass false for this option.
reuseWhitespace: true,
// Override this option to use a different line terminator, e.g. \r\n.
lineTerminator: require("os").EOL || "\n",
// Some of the pretty-printer code (such as that for printing function
// parameter lists) makes a valiant attempt to prevent really long
// lines. You can adjust the limit by changing this option; however,
// there is no guarantee that line length will fit inside this limit.
wrapColumn: 74, // Aspirational for now.
// Pass a string as options.sourceFileName to recast.parse to tell the
// reprinter to keep track of reused code so that it can construct a
// source map automatically.
sourceFileName: null,
// Pass a string as options.sourceMapName to recast.print, and (provided
// you passed options.sourceFileName earlier) the PrintResult of
// recast.print will have a .map property for the generated source map.
sourceMapName: null,
// If provided, this option will be passed along to the source map
// generator as a root directory for relative source file paths.
sourceRoot: null,
// If you provide a source map that was generated from a previous call
// to recast.print as options.inputSourceMap, the old source map will be
// composed with the new source map.
inputSourceMap: null,
// If you want esprima to generate .range information (recast only uses
// .loc internally), pass true for this option.
range: false,
// If you want esprima not to throw exceptions when it encounters
// non-fatal errors, keep this option true.
tolerant: true,
// If you want to override the quotes used in string literals, specify
// either "single", "double", or "auto" here ("auto" will select the one
// which results in the shorter literal) Otherwise, use double quotes.
quote: null,
// Controls the printing of trailing commas in object literals, array
// expressions and function parameters.
//
// This option could either be:
// * Boolean - enable/disable in all contexts (objects, arrays and function params).
// * Object - enable/disable per context.
//
// Example:
// trailingComma: {
// objects: true,
// arrays: true,
// parameters: false,
// }
trailingComma: false,
// Controls the printing of spaces inside array brackets.
// See: http://eslint.org/docs/rules/array-bracket-spacing
arrayBracketSpacing: false,
// Controls the printing of spaces inside object literals,
// destructuring assignments, and import/export specifiers.
// See: http://eslint.org/docs/rules/object-curly-spacing
objectCurlySpacing: true,
// If you want parenthesis to wrap single-argument arrow function
// parameter lists, pass true for this option.
arrowParensAlways: false,
// There are 2 supported syntaxes (`,` and `;`) in Flow Object Types;
// The use of commas is in line with the more popular style and matches
// how objects are defined in JS, making it a bit more natural to write.
flowObjectCommas: true,
// Whether to return an array of .tokens on the root AST node.
tokens: true
}, hasOwn = defaults.hasOwnProperty;
// Copy options and fill in default values.
exports.normalize = function(options) {
options = options || defaults;
function get(key) {
return hasOwn.call(options, key)
? options[key]
: defaults[key];
}
return {
tabWidth: +get("tabWidth"),
useTabs: !!get("useTabs"),
reuseWhitespace: !!get("reuseWhitespace"),
lineTerminator: get("lineTerminator"),
wrapColumn: Math.max(get("wrapColumn"), 0),
sourceFileName: get("sourceFileName"),
sourceMapName: get("sourceMapName"),
sourceRoot: get("sourceRoot"),
inputSourceMap: get("inputSourceMap"),
parser: get("esprima") || get("parser"),
range: get("range"),
tolerant: get("tolerant"),
quote: get("quote"),
trailingComma: get("trailingComma"),
arrayBracketSpacing: get("arrayBracketSpacing"),
objectCurlySpacing: get("objectCurlySpacing"),
arrowParensAlways: get("arrowParensAlways"),
flowObjectCommas: get("flowObjectCommas"),
tokens: !!get("tokens")
};
};