nl_tokens: If indexArgumentExpression is a string literal or number literal returns its text . If indexArgumentExpression is a constant value returns its string value . If indexArgumentExpression is a well known symbol returns the property name corresponding to this symbol as long as it is a proper symbol reference . Otherwise returns undefined .
pl_tokens: function getPropertyNameForIndexedAccess ( indexArgumentExpression , indexArgumentType ) { if ( indexArgumentExpression . kind === 9 /* StringLiteral */ || indexArgumentExpression . kind === 8 /* NumericLiteral */ ) { return indexArgumentExpression . text ; } if ( indexArgumentExpression . kind === 167 /* ElementAccessExpression */ || indexArgumentExpression . <mask> === 166 /* PropertyAccessExpression */ ) { var value = getConstantValue ( indexArgumentExpression ) ; if ( value !== undefined ) { return value . toString ( ) ; } } if ( checkThatExpressionIsProperSymbolReference ( indexArgumentExpression , indexArgumentType , /*reportError*/ false ) ) { var rightHandSideName = indexArgumentExpression . name . text ; return ts . getPropertyNameForKnownSymbolName ( rightHandSideName ) ; } return undefined ; }