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Swap `forEachChild` to use a table of functions instead of a `switch`… · microsoft/TypeScript@76357ba · GitHub
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* Swap `forEachChild` to use an array of functions instead of a `switch` statement.
* Let's see if 'new' changes anything.
* Co-locate each assignment into `forEachChildTable`.
* Try `push`ing undefined to create a packed Array.
* Try using an unconditional no-op function.
* `forEach` -> `forEachChildIn`
* Remove the optional chain if we are pre-filling with no-ops.
* Grab function directly to avoid possible `.call` overhead from downlevel emit.
* Swap to object literal.
* Lints and formatting.
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