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Raising an issue for tracking: such switch should simplify and speed up code generation, and allow us to avoid custom patches we have in Terser.
Background (https://github.com/emscripten-core/emscripten/issues/11303#issuecomment-702853752):
@kripken: We don't use terser for minification. In
tools/acorn_optimizer.jsit's used to convert an acorn AST to JS (so it's in support of the passes in that file, which are almost all not minification-related). Maybe there's a better way or simpler tool for that? I remember I couldn't find one at the time.
@rreverser: Ah, that's what I thought after looking at the code. Yeah, there is estools/escodegen which, among other ESTree tools in that org, was created specifically as a simple AST-to-JS generator. It should be both simpler and much faster than going via all Terser's conversions.