swc_ecma_codegen:

• Use span for await token.
• Use span for debugger statements.
• Use span for object literals.
• Use span for object patterns.
• Use span for array literals.
• Use span for try.
• Use span for for.
• Use span for return.
• Use span for break.
• Use span for continue.
• Use span for this.
• Use span for switch.
• Use span for catch.
• Use span for case.
• Use span for function.
• Use span for unary expressions.

swc_ecma_minifier:

• Normalize sequences expressions if the length is 1.