testLocalNamesAreAlphaRenamable

tcmts.core.test.hash.testLocalNamesAreAlphaRenamable · #6xpihkzs · term

Local names are alpha-renamable unless they become a runtime name.

import { hashes } from "#codebase/tcmts/core/test/hash";
import assert from "node:assert/strict";

export const testLocalNamesAreAlphaRenamable = () => {
  // parameters and plain locals: renaming is invisible
  assert.equal(hashes(`const f = (x: number) => { const y = x + 1; return y }`).f, hashes(`const f = (a: number) => { const b = a + 1; return b }`).f);
  // local function names, and bindings that name an anonymous function, are visible through .name
  assert.notEqual(hashes(`function outer() { function a() {} return a }`).outer, hashes(`function outer() { function b() {} return b }`).outer);
  assert.notEqual(hashes(`const f = () => { const g = () => 1; return g }`).f, hashes(`const f = () => { const h = () => 1; return h }`).f);
  assert.notEqual(hashes(`const f = (cb = () => 1) => cb`).f, hashes(`const f = (fn = () => 1) => fn`).f);
  assert.notEqual(hashes(`const f = () => { let g; g = () => 1; return g }`).f, hashes(`const f = () => { let h; h = () => 1; return h }`).f);
}

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