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TSC Directive ↔ comment statement as Directive to control TSC behavior on line/file basis

// @ts-ignore​

tell TSC to ignore Type-Check for next line only

// @ts-nocheck`​

tell TSC to not Type-Check this file

// @ts-check`​

tell TSC to check this (JS?) file

// @ts-expect-error​

tell TSC to expect & suppress static error on next line

!snippet // @ts-expect-error` with assert.throws() 

assert.throws(
  // @ts-expect-error: Object is possibly "null". (2531)
  () => null.someProperty,
  TypeError);

References​