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# Changelog
## v5.5.1
- Fixed object properties with unicode surrogates on safari.
## v5.5.0
- Fixed crash when inlining uninitialized variable into template string.
- The sourcemap for dist was removed for being too large.
## v5.4.0
- Logical assignment
- Change `let x = undefined` to just `let x`
- Removed some optimizations for template strings, placing them behind `unsafe` options. Reason: adding strings is not equivalent to template strings, due to valueOf differences.
- The AST_Token class was slimmed down in order to use less memory.
## v5.3.8
- Restore node 13 support
## v5.3.7
Hotfix release, fixes package.json "engines" syntax
## v5.3.6
- Fixed parentheses when outputting `??` mixed with `||` and `&&`
- Improved hygiene of the symbol generator
## v5.3.5
- Avoid moving named functions into default exports.
- Enabled transform() for chain expressions. This allows AST transformers to reach inside chain expressions.
## v5.3.4
- Fixed a crash when hoisting (with `hoist_vars`) a destructuring variable declaration
## v5.3.3
- `source-map` library has been updated, bringing memory usage and CPU time improvements when reading input source maps (the SourceMapConsumer is now WASM based).
- The `wrap_func_args` option now also wraps arrow functions, as opposed to only function expressions.
## v5.3.2
- Prevented spread operations from being expanded when the expanded array/object contains getters, setters, or array holes.
- Fixed _very_ slow self-recursion in some cases of removing extraneous parentheses from `+` operations.
## v5.3.1
- An issue with destructuring declarations when `pure_getters` is enabled has been fixed
- Fixed a crash when chain expressions need to be shallowly compared
- Made inlining functions more conservative to make sure a function that contains a reference to itself isn't moved into a place that can create multiple instances of itself.
## v5.3.0
- Fixed a crash when compressing object spreads in some cases
- Fixed compiletime evaluation of optional chains (caused typeof a?.b to always return "object")
- domprops has been updated to contain every single possible prop
## v5.2.1
- The parse step now doesn't accept an `ecma` option, so that all ES code is accepted.
- Optional dotted chains now accept keywords, just like dotted expressions (`foo?.default`)
## v5.2.0
- Optional chaining syntax is now supported.
- Consecutive await expressions don't have unnecessary parens
- Taking the variable name's length (after mangling) into consideration when deciding to inline
## v5.1.0
- `import.meta` is now supported
- Typescript typings have been improved
## v5.0.0
- `in` operator now taken into account during property mangle.
- Fixed infinite loop in face of a reference loop in some situations.
- Kept exports and imports around even if there's something which will throw before them.
- The main exported bundle for commonjs, dist/bundle.min.js is no longer minified.
## v5.0.0-beta.0
- BREAKING: `minify()` is now async and rejects a promise instead of returning an error.
- BREAKING: Internal AST is no longer exposed, so that it can be improved without releasing breaking changes.
- BREAKING: Lowest supported node version is 10
- BREAKING: There are no more warnings being emitted
- Module is now distributed as a dual package - You can `import` and `require()` too.
- Inline improvements were made
## v4.8.0
- Support for numeric separators (`million = 1_000_000`) was added.
- Assigning properties to a class is now assumed to be pure.
- Fixed bug where `yield` wasn't considered a valid property key in generators.
## v4.7.0
- A bug was fixed where an arrow function would have the wrong size
- `arguments` object is now considered safe to retrieve properties from (useful for `length`, or `0`) even when `pure_getters` is not set.
- Fixed erroneous `const` declarations without value (which is invalid) in some corner cases when using `collapse_vars`.
## v4.6.13
- Fixed issue where ES5 object properties were being turned into ES6 object properties due to more lax unicode rules.
- Fixed parsing of BigInt with lowercase `e` in them.
## v4.6.12
- Fixed subtree comparison code, making it see that `[1,[2, 3]]` is different from `[1, 2, [3]]`
- Printing of unicode identifiers has been improved
## v4.6.11
- Read unused classes' properties and method keys, to figure out if they use other variables.
- Prevent inlining into block scopes when there are name collisions
- Functions are no longer inlined into parameter defaults, because they live in their own special scope.
- When inlining identity functions, take into account the fact they may be used to drop `this` in function calls.
- Nullish coalescing operator (`x ?? y`), plus basic optimization for it.
- Template literals in binary expressions such as `+` have been further optimized
## v4.6.10
- Do not use reduce_vars when classes are present
## v4.6.9
- Check if block scopes actually exist in blocks
## v4.6.8
- Take into account "executed bits" of classes like static properties or computed keys, when checking if a class evaluation might throw or have side effects.
## v4.6.7
- Some new performance gains through a `AST_Node.size()` method which measures a node's source code length without printing it to a string first.
- An issue with setting `--comments` to `false` in the CLI has been fixed.
- Fixed some issues with inlining
- `unsafe_symbols` compress option was added, which turns `Symbol("name")` into just `Symbol()`
- Brought back compress performance improvement through the `AST_Node.equivalent_to(other)` method (which was reverted in v4.6.6).
## v4.6.6
(hotfix release)
- Reverted code to 4.6.4 to allow for more time to investigate an issue.
## v4.6.5 (REVERTED)
- Improved compress performance through using a new method to see if two nodes are equivalent, instead of printing them to a string.
## v4.6.4
- The `"some"` value in the `comments` output option now preserves `@lic` and other important comments when using `//`
- `</script>` is now better escaped in regex, and in comments, when using the `inline_script` output option
- Fixed an issue when transforming `new RegExp` into `/.../` when slashes are included in the source
- `AST_Node.prototype.constructor` now exists, allowing for easier debugging of crashes
- Multiple if statements with the same consequents are now collapsed
- Typescript typings improvements
- Optimizations while looking for surrogate pairs in strings
## v4.6.3
- Annotations such as `/*#__NOINLINE__*/` and `/*#__PURE__*/` may now be preserved using the `preserve_annotations` output option
- A TypeScript definition update for the `keep_quoted` output option.
## v4.6.2
- A bug where functions were inlined into other functions with scope conflicts has been fixed.
- `/*#__NOINLINE__*/` annotation fixed for more use cases where inlining happens.
## v4.6.1
- Fixed an issue where a class is duplicated by reduce_vars when there's a recursive reference to the class.
## v4.6.0
- Fixed issues with recursive class references.
- BigInt evaluation has been prevented, stopping Terser from evaluating BigInts like it would do regular numbers.
- Class property support has been added
## v4.5.1
(hotfix release)
- Fixed issue where `() => ({})[something]` was not parenthesised correctly.
## v4.5.0
- Inlining has been improved
- An issue where keep_fnames combined with functions declared through variables was causing name shadowing has been fixed
- You can now set the ES version through their year
- The output option `keep_numbers` has been added, which prevents Terser from turning `1000` into `1e3` and such
- Internal small optimisations and refactors
## v4.4.3
- Number and BigInt parsing has been fixed
- `/*#__INLINE__*/` annotation fixed for arrow functions with non-block bodies.
- Functional tests have been added, using [this repository](https://github.com/terser/terser-functional-tests).
- A memory leak, where the entire AST lives on after compression, has been plugged.
## v4.4.2
- Fixed a problem with inlining identity functions
## v4.4.1
*note:* This introduced a feature, therefore it should have been a minor release.
- Fixed a crash when `unsafe` was enabled.
- An issue has been fixed where `let` statements might be collapsed out of their scope.
- Some error messages have been improved by adding quotes around variable names.
## v4.4.0
- Added `/*#__INLINE__*/` and `/*#__NOINLINE__*/` annotations for calls. If a call has one of these, it either forces or forbids inlining.
## v4.3.11
- Fixed a problem where `window` was considered safe to access, even though there are situations where it isn't (Node.js, workers...)
- Fixed an error where `++` and `--` were considered side-effect free
- `Number(x)` now needs both `unsafe` and and `unsafe_math` to be compressed into `+x` because `x` might be a `BigInt`
- `keep_fnames` now correctly supports regexes when the function is in a variable declaration
## v4.3.10
- Fixed syntax error when repeated semicolons were encountered in classes
- Fixed invalid output caused by the creation of empty sequences internally
- Scopes are now updated when scopes are inlined into them
## v4.3.9
- Fixed issue with mangle's `keep_fnames` option, introduced when adding code to keep variable names of anonymous functions
## v4.3.8
- Typescript typings fix
## v4.3.7
- Parsing of regex options in the CLI (which broke in v4.3.5) was fixed.
- typescript definition updates
## v4.3.6
(crash hotfix)
## v4.3.5
- Fixed an issue with DOS line endings strings separated by `\` and a new line.
- Improved fix for the output size regression related to unused references within the extends section of a class.
- Variable names of anonymous functions (eg: `const x = () => { ... }` or `var func = function () {...}`) are now preserved when keep_fnames is true.
- Fixed performance degradation introduced for large payloads in v4.2.0
## v4.3.4
- Fixed a regression where the output size was increased when unused classes were referred to in the extends clause of a class.
- Small typescript typings fixes.
- Comments with `@preserve`, `@license`, `@cc_on` as well as comments starting with `/*!` and `/**!` are now preserved by default.
## v4.3.3
- Fixed a problem where parsing template strings would mix up octal notation and a slash followed by a zero representing a null character.
- Started accepting the name `async` in destructuring arguments with default value.
- Now Terser takes into account side effects inside class `extends` clauses.
- Added parens whenever there's a comment between a return statement and the returned value, to prevent issues with ASI.
- Stopped using raw RegExp objects, since the spec is going to continue to evolve. This ensures Terser is able to process new, unknown RegExp flags and features. This is a breaking change in the AST node AST_RegExp.
## v4.3.2
- Typescript typing fix
- Ensure that functions can't be inlined, by reduce_vars, into places where they're accessing variables with the same name, but from somewhere else.
## v4.3.1
- Fixed an issue from 4.3.0 where any block scope within a for loop erroneously had its parent set to the function scopee
- Fixed an issue where compressing IIFEs with argument expansions would result in some parameters becoming undefined
- addEventListener options argument's properties are now part of the DOM properties list.
## v4.3.0
- Do not drop computed object keys with side effects
- Functions passed to other functions in calls are now wrapped in parentheses by default, which speeds up loading most modules
- Objects with computed properties are now less likely to be hoisted
- Speed and memory efficiency optimizations
- Fixed scoping issues with `try` and `switch`
## v4.2.1
- Minor refactors
- Fixed a bug similar to #369 in collapse_vars
- Functions can no longer be inlined into a place where they're going to be compared with themselves.
- reduce_funcs option is now legacy, as using reduce_vars without reduce_funcs caused some weird corner cases. As a result, it is now implied in reduce_vars and can't be turned off without turning off reduce_vars.
- Bug which would cause a random stack overflow has now been fixed.
## v4.2.0
- When the source map URL is `inline`, don't write it to a file.
- Fixed output parens when a lambda literal is the tag on a tagged template string.
- The `mangle.properties.undeclared` option was added. This enables the property mangler to mangle properties of variables which can be found in the name cache, but whose properties are not known to this Terser run.
- The v8 bug where the toString and source representations of regexes like `RegExp("\\\n")` includes an actual newline is now fixed.
- Now we're guaranteed to not have duplicate comments in the output
- Domprops updates
## v4.1.4
- Fixed a crash when inlining a function into somewhere else when it has interdependent, non-removable variables.
## v4.1.3
- Several issues with the `reduce_vars` option were fixed.
- Starting this version, we only have a dist/bundle.min.js
## v4.1.2
- The hotfix was hotfixed
## v4.1.1
- Fixed a bug where toplevel scopes were being mixed up with lambda scopes
## v4.1.0
- Internal functions were replaced by `Object.assign`, `Array.prototype.some`, `Array.prototype.find` and `Array.prototype.every`.
- A serious issue where some ESM-native code was broken was fixed.
- Performance improvements were made.
- Support for BigInt was added.
- Inline efficiency was improved. Functions are now being inlined more proactively instead of being inlined only after another Compressor pass.
## v4.0.2
(Hotfix release. Reverts unmapped segments PR [#342](https://github.com/terser/terser/pull/342), which will be put back on Terser when the upstream issue is resolved)
## v4.0.1
- Collisions between the arguments of inlined functions and names in the outer scope are now being avoided while inlining
- Unmapped segments are now preserved when compressing a file which has source maps
- Default values of functions are now correctly converted from Mozilla AST to Terser AST
- JSON ⊂ ECMAScript spec (if you don't know what this is you don't need to)
- Export AST_* classes to library users
- Fixed issue with `collapse_vars` when functions are created with the same name as a variable which already exists
- Added `MutationObserverInit` (Object with options for initialising a mutation observer) properties to the DOM property list
- Custom `Error` subclasses are now internally used instead of old-school Error inheritance hacks.
- Documentation fixes
- Performance optimizations
## v4.0.0
- **breaking change**: The `variables` property of all scopes has become a standard JavaScript `Map` as opposed to the old bespoke `Dictionary` object.
- Typescript definitions were fixed
- `terser --help` was fixed
- The public interface was cleaned up
- Fixed optimisation of `Array` and `new Array`
- Added the `keep_quoted=strict` mode to mangle_props, which behaves more like Google Closure Compiler by mangling all unquoted property names, instead of reserving quoted property names automatically.
- Fixed parent functions' parameters being shadowed in some cases
- Allowed Terser to run in a situation where there are custom functions attached to Object.prototype
- And more bug fixes, optimisations and internal changes
## v3.17.0
- More DOM properties added to --mangle-properties's DOM property list
- Closed issue where if 2 functions had the same argument name, Terser would not inline them together properly
- Fixed issue with `hasOwnProperty.call`
- You can now list files to minify in a Terser config file
- Started replacing `new Array(<number>)` with an array literal
- Started using ES6 capabilities like `Set` and the `includes` method for strings and arrays
## v3.16.1
- Fixed issue where Terser being imported with `import` would cause it not to work due to the `__esModule` property. (PR #254 was submitted, which was nice, but since it wasn't a pure commonJS approach I decided to go with my own solution)
## v3.16.0
- No longer leaves names like Array or Object or window as a SimpleStatement (statement which is just a single expression).
- Add support for sections sourcemaps (IndexedSourceMapConsumer)
- Drops node.js v4 and starts using commonJS
- Is now built with rollup
## v3.15.0
- Inlined spread syntax (`[...[1, 2, 3], 4, 5] => [1, 2, 3, 4, 5]`) in arrays and objects.
- Fixed typo in compressor warning
- Fixed inline source map input bug
- Fixed parsing of template literals with unnecessary escapes (Like `\\a`)
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