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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -644,6 +644,10 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u - `booleans` -- various optimizations for boolean context, for example `!!a ? b : c → a ? b : c` +- `typeofs` -- default `true`. Transforms `typeof foo == "undefined"` into + `foo === void 0`. Note: recommend to set this value to `false` for IE10 and + earlier versions due to known issues. + - `loops` -- optimizations for `do`, `while` and `for` loops when we can statically determine the condition @@ -873,7 +877,6 @@ when this flag is on: - `new Object()` → `{}` - `String(exp)` or `exp.toString()` → `"" + exp` - `new Object/RegExp/Function/Error/Array (...)` → we discard the `new` -- `typeof foo == "undefined"` → `foo === void 0` - `void 0` → `undefined` (if there is a variable named "undefined" in scope; we do it because the variable name will be mangled, typically reduced to a single character) @@ -1050,5 +1053,5 @@ uglifyjs file.js -m ``` To enable fast minify mode with the API use: ```js -UglifyJS.minify(code, { compress: false, mangle: true }); +UglifyJS.minify(code, { compress: false, mangle: true }); ``` |