Sourced from terser's changelog.

v5.17.4

• Fix crash when trying to negate a class (!class{})
• Avoid outputting comments between yield/await and its argument
• Fix detection of left-hand-side of assignment, to avoid optimizing it like any other expression in some edge cases

v5.17.3

• Fix issue with trimming a static class property's contents accessing the class as this.

v5.17.2

• Be less conservative when detecting use-before-definition of var in hoisted functions.
• Support unusual (but perfectly valid) initializers of for-in and for-of loops.
• Fix issue where hoisted function would be dropped if it was after a continue statement

v5.17.1

• Fix evaluating .length when the source array might've been mutated

v5.17.0

• Drop vestigial = undefined default argument in IIFE calls (#1366)
• Evaluate known arrays' .length property when statically determinable
• Add @__KEY__ annotation to mangle string literals (#1365)

v5.16.9

• Fix parentheses in output of optional chains (a?.b) (#1374)
• More documentation on source maps (#1368)
• New lhs_constants option, allowing to stop Terser from swapping comparison operands (#1361)

v5.16.8

• Become even less conservative around function definitions for reduce_vars
• Fix parsing context of import.meta expressions such that method calls are allowed

v5.16.6

• Become less conservative with analyzing function definitions for reduce_vars
• Parse import.meta as a real AST node and not an object.property

v5.16.5

• Correctly handle AST transform functions that mutate children arrays
• Don't mutate the options object passed to Terser (#1342)
• Do not treat BigInt like a number

v5.16.4

• Keep (defaultArg = undefined) => ..., because default args don't count for function length
• Prevent inlining variables into ?. optional chains
• Avoid removing unused arguments while transforming
• Optimize iterating AST node lists

... (truncated)

• b101a70 5.17.4
• 6906b8a update changelog
• 3cb47fb Fix crash when trying to negate a class. Closes #1292
• 28bc97a Avoid adding a comment between yield/await and its argument. Closes #983
• 2bc5449 fix detection of left-hand-side of assignment. Closes #868
• d236265 5.17.3
• 7667aa5 update changelog
• 26b70f3 Do not remove static class properties that use this. Closes #1385
• 474fca5 5.17.2
• 1213257 update changelog
• Additional commits viewable in compare view

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