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Ensure type checks are against valid types

This rule prevents spelling mistakes in 'typeof' unary operator checks. Valid types are symbol, undefined, object, boolean, number, string and function.

CheckId SPC018909
TypeName EnsureTypeofValid
Severity CriticalError
Type JavaScriptFile

Bad Practice

if(typeof foo == 'strgni') {
  return false;

Good Practice
if(typeof foo == 'string') {
  return false;

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