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document top level minify option keep_classnames

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README.md
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@ -107,6 +107,7 @@ a double dash to prevent input files being used as option arguments:
Equivalent to setting `ie8: true` in `minify()` Equivalent to setting `ie8: true` in `minify()`
for `compress`, `mangle` and `output` options. for `compress`, `mangle` and `output` options.
By default UglifyJS will not try to be IE-proof. By default UglifyJS will not try to be IE-proof.
--keep-classnames Do not mangle/drop class names.
--keep-fnames Do not mangle/drop function names. Useful for --keep-fnames Do not mangle/drop function names. Useful for
code relying on Function.prototype.name. code relying on Function.prototype.name.
--name-cache <file> File to hold mangled name mappings. --name-cache <file> File to hold mangled name mappings.
@ -509,8 +510,13 @@ if (result.error) throw result.error;
- `ie8` (default `false`) - set to `true` to support IE8. - `ie8` (default `false`) - set to `true` to support IE8.
- `keep_classnames` (default: `undefined`) - pass `true` to prevent discarding or mangling
of class names.
- `keep_fnames` (default: `false`) - pass `true` to prevent discarding or mangling - `keep_fnames` (default: `false`) - pass `true` to prevent discarding or mangling
of function names. Useful for code relying on `Function.prototype.name`. of function names. Useful for code relying on `Function.prototype.name`. If the
top level minify option `keep_classnames` is `undefined` it will be overriden with
the value of the top level minify option `keep_fnames`.
## Minify options structure ## Minify options structure
@ -538,6 +544,8 @@ if (result.error) throw result.error;
ecma: 5, // specify one of: 5, 6, 7 or 8 ecma: 5, // specify one of: 5, 6, 7 or 8
nameCache: null, // or specify a name cache object nameCache: null, // or specify a name cache object
toplevel: false, toplevel: false,
keep_classnames: false,
keep_fnames: false,
ie8: false, ie8: false,
warnings: false, warnings: false,
} }
@ -668,6 +676,10 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
compressor from discarding unused function arguments. You need this compressor from discarding unused function arguments. You need this
for code which relies on `Function.length`. for code which relies on `Function.length`.
- `keep_classnames` (default: `false`) -- Pass `true` to prevent the
compressor from discarding class names. See also: the `keep_classnames`
[mangle option](#mangle).
- `keep_fnames` (default: `false`) -- Pass `true` to prevent the - `keep_fnames` (default: `false`) -- Pass `true` to prevent the
compressor from discarding function names. Useful for code relying on compressor from discarding function names. Useful for code relying on
`Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle). `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle).