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fixes #27
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- remove overlap in functionality of singular, consecutive reference of constant value
- remove workarounds for previous bugs in `lib/scope.js`
- distribute recursive `collapse_single_use_vars()` calls to their respective `OPT(AST_Node)`
- enable collapsing of variables within a single `AST_Definitions`
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`var a=1;a=2;x(a)` => `x(2)`
fix pre-existing issues
- reference counting on assignment
- walking of anonymous functions
- chained assignment
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Side effects of `&&` and `||` have not mattered until #1814, which takes assignment expressions into account.
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These are surprisingly common, as people reuse the same variable name within loops or switch branches.
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Possible partial execution due to exceptions.
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- allow immediate assignment after declaration of variable
- relax modification rule for immutable value
- fix order of visit for TreeWalker
- remove extraneous code
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- let `collapse_vars` take care of value containing any symbols
- improve overhead accounting
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- rename `screw_ie8` to `ie8`
- rename `mangle.except` to `mangle.reserved`
- rename `mangle.properties.ignore_quoted` to `mangle.properties.keep_quoted`
- compact `sourceMap` options
- more stringent verification on input `options`
- toplevel shorthands
- `ie8`
- `keep_fnames`
- `toplevel`
- `warnings`
- support arrays and unquoted string values on CLI
- drop `fromString` from `minify()`
- `minify()` no longer handles any `fs` operations
- unify order of operations for `mangle_properties()` on CLI & API
- `bin/uglifyjs` used to `mangle_properties()` before even `Compressor`
- `minify()` used to `mangle_properties()` after `Compressor` but before `mangle_names()`
- both will now do `Compressor`, `mangle_names()` then `mangle_properties()`
- `options.parse` / `--parse` for parser options beyond `bare_returns`
- add `mangle.properties.builtins` to disable built-in reserved list
- disable with `--mangle-props builtins` on CLI
- `warnings` now off by default
- add `--warn` and `--verbose` on CLI
- drop `--enclose`
- drop `--export-all`
- drop `--reserved-file`
- use `--mangle reserved` instead
- drop `--reserve-domprops`
- enabled by default, disable with `--mangle-props domprops`
- drop `--prefix`
- use `--source-map base` instead
- drop `--lint`
- remove `bin/extract-props.js`
- limit exposure of internal APIs
- update documentations
closes #96
closes #102
closes #136
closes #166
closes #243
closes #254
closes #261
closes #311
closes #700
closes #748
closes #912
closes #1072
closes #1366
fixes #101
fixes #123
fixes #124
fixes #263
fixes #379
fixes #419
fixes #423
fixes #461
fixes #465
fixes #576
fixes #737
fixes #772
fixes #958
fixes #1036
fixes #1142
fixes #1175
fixes #1220
fixes #1223
fixes #1280
fixes #1359
fixes #1368
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Remove support for `@ngInject` as there are proper alternatives anyway.
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- rename `AST_Seq` to `AST_Sequence`
- raise default sequences_limit from 200 to 800
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`Infinity = beyond` should not become `1/0 = beyond`
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- `optimize()` substituted expression
- compute nested property string correctly
fixes #1801
Miscellaneous
- reset optimisation flags on all node types
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- assignment
- boolean
- conditional
- sequence
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`delete Infinity` returns `false` where as `delete (1/0)` returns `true`
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Improved catch handling in `figure_out_scope()` means special case treatment of IE8 is no longer valid in `reset_opt_flags()`.
Also fixed recursive assignment in variable definition.
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`AST_Node.optimize()` is context-aware, so don't cache its results to be used elsewhere.
Also fixed a few cases of AST corruption and beef up safety of `pure_getters`.
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- property access to `null` & `undefined` always has side effects
- utilise `reduce_vars` to determine safe property access
- may-be cases treated as side effects unless `unsafe`
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Although it would be nice to enforce `AST_Node` cloning during transformation, that ship has sailed a long time ago.
We now get the assigned value when resolving `AST_SymbolRef` instead of `reset_opt_flags()`, which has the added advantage of improved compressor efficiency.
fixes #1787
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- better heuristics to avoid issues like #1532
- fix `TreeWalker.loopcontrol_target()`
- `continue` cannot refer to `switch` blocks
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- `null`
- `true`
- `false`
- numeric literals
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- fix handling of "-Infinity"
- add test case for "-0"
reverts #1481
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`NaN` already works by the happy accident of `Number.NaN`
fixes #1770
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(#1763)
fixes #1760
fixes #1761
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- fix side effects in switch condition for singular blocks
- fix `undefined` confusion with local variable
- gate `OPT(AST_Switch)` with `switches`
fixes #1758
fixes #1759
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Merge unreachable case body with previous fallthrough case
fixes #1750
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- migrate transformation logic from `OutputStream` to `Compressor`
- always turn `undefined` into `void 0` (unless `unsafe`)
- always keep `NaN` except when avoiding local variable redefinition
- introduce `keep_infinity` to suppress `1/0` transform, except when avoiding local variable redefinition
supersedes #1723
fixes #1730
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They started off as functional groups I guess, but given the sheer number of options this is becoming too difficult to read.
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Only need to look up the immediate non-block/catch scope for the same-name special case.
fixes #1733
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- eliminate empty blocks
- flatten out if try-block does not throw
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- `side_effects` will clean up inner statements, so checking for an empty function body should suffice
- drop side effects when dropping `return` from statement
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fixes #1724
fixes #1725
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- move these optimisations out from `Compressor` to `OutputStream`
- fixes behaviour inconsistency when running uglified code from global or module levels due to redefinition
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When fixing catch-related issue in #1715, it tries to optimise for duplicate definitions but did not take anonymous functions into account.
Remove such optimisation for now and we can cover this as a more general rule later.
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fixes #1715
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fixes #1710
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fixes #1709
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The following code prints `1`:
var a = 1;
!function(){
a = 4;
try{
throw 2;
} catch (a) {
var a = 3;
}
}();
console.log(a);
fixes #1708
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now guarded under `dead_code`
fixes #1705
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fixes #1704
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