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v5.14.2

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• Security fix for RegExps that should not be evaluated (regexp DDOS)
• Source maps improvements (#​1211)
• Performance improvements in long property access evaluation (#​1213)

v5.14.1

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• keep_numbers option added to TypeScript defs (#​1208)
• Fixed parsing of nested template strings (#​1204)

v5.14.0

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• Switched to @​jridgewell/source-map for sourcemap generation (#​1190, #​1181)
• Fixed source maps with non-terminated segments (#​1106)
• Enabled typescript types to be imported from the package (#​1194)
• Extra DOM props have been added (#​1191)
• Delete the AST while generating code, as a means to save RAM

v5.13.1

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• Removed self-assignments (varname=varname) (closes #​1081)
• Separated inlining code (for inlining things into references, or removing IIFEs)
• Allow multiple identifiers with the same name in var destructuring (eg var { a, a } = x) (#​1176)

v5.13.0

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• All calls to eval() were removed (#​1171, #​1184)
• source-map was updated to 0.8.0-beta.0 (#​1164)
• NavigatorUAData was added to domprops to avoid property mangling (#​1166)

v5.12.1

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• Fixed an issue with function definitions inside blocks (#​1155)
• Fixed parens of new in some situations (closes #​1159)

v5.12.0

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• TERSER_DEBUG_DIR environment variable
• @​copyright comments are now preserved with the comments="some" option (#​1153)

v5.11.0

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• Unicode code point escapes (\u{abcde}) are not emitted inside RegExp literals anymore (#​1147)
• acorn is now a regular dependency

v5.10.0

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• Massive optimization to max_line_len (#​1109)
• Basic support for import assertions
• Marked ES2022 Object.hasOwn as a pure function
• Fix delete optional?.property
• New CI/CD pipeline with github actions (#​1057)
• Fix reordering of switch branches (#​1092), (#​1084)
• Fix error when creating a class property called get
• Acorn dependency is now an optional peerDependency
• Fix mangling collision with exported variables (#​1072)
• Fix an issue with return someVariable = (async () => { ... })() (#​1073)

v5.9.0

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• Collapsing switch cases with the same bodies (even if they're not next to each other) (#​1070).
• Fix evaluation of optional chain expressions (#​1062)
• Fix mangling collision in ESM exports (#​1063)
• Fix issue with mutating function objects after a second pass (#​1047)
• Fix for inlining object spread { ...obj } (#​1071)
• Typescript typings fix (#​1069)

v5.8.0

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• Fixed shadowing variables while moving code in some cases (#​1065)
• Stop mangling computed & quoted properties when keep_quoted is enabled.
• Fix for mangling private getter/setter and .#private access (#​1060, #​1068)
• Array.from has a new optimization when the unsafe option is set (#​737)
• Mangle/propmangle let you generate your own identifiers through the nth_identifier option (#​1061)
• More optimizations to switch statements (#​1044)

v5.7.2

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• Fixed issues with compressing functions defined in global_defs option (#​1036)
• New recipe for using Terser in gulp was added to RECIPES.md (#​1035)
• Fixed issues with ?? and ?. (#​1045)
• Future reserved words such as package no longer require you to disable strict mode to be used as names.
• Refactored huge compressor file into multiple more focused files.
• Avoided unparenthesized in operator in some for loops (it breaks parsing because of for..in loops)
• Improved documentation (#​1021, #​1025)
• More type definitions (#​1021)

v5.7.1

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• Avoided collapsing assignments together if it would place a chain assignment on the left hand side, which is invalid syntax (a?.b = c)
• Removed undefined from object expansions ({ ...void 0 } -> {})
• Fix crash when checking if something is nullish or undefined (#​1009)
• Fixed comparison of private class properties (#​1015)
• Minor performance improvements (#​993)
• Fixed scope of function defs in strict mode (they are block scoped)